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Urinary Clearance of Cranberry Flavonol Glycosides in Humans

Posted: December 21, 2016
Authors: Yifei Wang, Ajay P. Singh, Heather N. Nelson, Amanda J. Kaiser, Nicolette C. Reker,Tisha L. Hooks,Ted Wilson, and Nicholi Vorsa
Journal: J. Agric. Food Chem

Abstract: ABSTRACT: Cranberry is reported to have health benefits, including prevention of urinary tract infections and other chronic diseases, due to the high content of polyphenols, including flavonols and flavan-3-ols. The aim of this study was to determine the clearance of flavonol glycosides and flavan-3-ols and/or their metabolites in human urine. Ten healthy women volunteers ingested 240 mL of cranberry juice containing flavonol glycosides. Urine samples were collected at 0, 90, 225, and 360 min postingestion. While flavan-3-ols were not detected, five flavonol glycosides common in cranberry were identified. Quercetin-3-galactoside, the most abundant cranberry flavonol, exhibited the highest peak urine concentration (Cmax) of 1315 pg/mg creatinine, followed by quercetin-3-rhamnoside, quercetin-3-arabinoside, myricetin-3-arabinoside, and myricetin-3-galactoside. Quercetin-3-arabinoside showed delayed clearance, Cmax at 237 min (Tmax), relative to other flavonols (90−151 min). Both aglycone and the conjugated sugar moiety structure mediate the flavonol’s bioavailability. Interindividual variation for bioavailability and clearance is also apparent. Metabolites, e.g. glucoronides, were not detected. KEYWORDS: flavonols, glycosides, flavan-3-ols, cranberry juice, human urine, MS-MS


Adjuvant effect of cranberry proanthocyanidin active fraction on antivirulent property of ciprofloxacin against Pseudomonas aeruginosa.

Posted: August 22, 2016
Authors: Vadekeetil A., Alexandar V., Chhibber S., Harjai K.
Journal: Microbial Pathogenesis; 2016. 90:98-103

Abstract: Quorum sensing inhibitors (QSIs) act as antivirulent agents since quorum sensing (QS) plays a vital role in regulating pathogenesis of Pseudomonas aeruginosa. However, application of single QSI may not be effective as pathogen is vulnerable to successful mutations. In such conditions, combination of QSIs can be exploited as there can be synergistic or adjuvant action. In the present study, we evaluated the antivirulence efficacy of combination of Vaccinium macrocarpon proanthocyanidin active fraction (PAF) and ciprofloxacin (CIP) at their sub-MICs using standard methods followed by analysis of their mode of action on QS using TLC and molecular docking. There was significant improvement in action of CIP when it was combined with PAF in reducing the QS controlled virulence factors (p<0.05), motilities and biofilm of P. aeruginosa. TLC profiles of QS signals [(Acyl homoserine lactone (AHL) and Pseudomonas quinolone signal (PQS))] indicated that CIP in combination with PAF, besides showing inhibitory action on production of AHLs, also modulated production and inactivation of PQS. Docking scores also supported the observation. We therefore hypothesize that PAF-CIP combination, having improved anti-virulence property; can be exploited as a potent drug pairing against P. aeruginosa.


Anti-inflammatory Activity of Berry Fruits in Mice Model of Inflammation is Based on Oxidative Stress Modulation

Posted: August 22, 2016
Authors: Nardi GM; Farias Januario AG; Freire CG; Megiolaro F; Schneider K; Perazzoli MR; Do Nascimento SR; Gon AC; Mariano LN; Wagner G; Niero R; Locatelli C
Journal: Pharmacognosy Research. 8(Suppl 1):S42-9

Abstract: BACKGROUND: Many fruits have been used as nutraceuticals because the presence of bioactive molecules that play biological activities. OBJECTIVE: The present study was designed to compare the anti-inflammatory and antioxidant effects of methanolic extracts of Lycium barbarum (GOJI), Vaccinium macrocarpon (CRAN) and Vaccinium myrtillus (BLUE). MATERIALS AND METHODS: Mices were treated with extracts (50 and 200 mg/kg, p.o.), twice a day through 10 days. Phytochemical analysis was performed by high-performance liquid chromatography. Antioxidant activity was determine by 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, reducing power, lipid peroxidation thiobarbituric acid reactive substances (TBARS), reduced glutathione (GSH) and catalase (CAT) activity. Anti-inflammatory activity was evaluated by paw edema followed by determination of myeloperoxidase (MPO) and TBARS. RESULTS: High amount of phenolic compounds, including rutin, were identified in all berries extracts. However, quercetin was observed only in BLUE and CRAN. GOJI presents higher scavenging activity of DPPH radical and reducing power than BLUE and CRAN. The extracts improved antioxidant status in liver; BLUE showed the largest reduction (75.3%) in TBARS when compared to CRAN (70.7%) and GOJI (65.3%). Nonetheless, CAT activity was lower in BLUE group. However, hepatic concentrations of GSH were higher in animals treated with GOJI rather than CRAN and BLUE. Despite all fruits caused a remarkable reduction in paw edema and TBARS, only BLUE and CRAN were able to reduce MPO. CONCLUSION: These results suggest that quercetin, rutin, or other phenolic compound found in these berry fruits extracts could produce an anti-inflammatory response based on modulation of oxidative stress in paw edema model. SUMMARY: Within fruits broadly consumed because of its nutraceuticals properties include, Lycium barbarum (Goji berry), Vaccinium myrtillus (Blueberry or Bilberry) and Vaccinium macrocarpon (Cranberry)The objectives of this study were the investigation and comparison of chemical composition, antioxidant activity "in vitro" and "in vivo" and anti inflammatory property of berry fruits bought dry form.In summary, two main findings can be addressed with this study: (1) Berry fruits presented antioxidant and anti inflammatory activities "in vitro" and "in vivo"; (2) the extracts of GOJI, CRAN, and BLUE modulate the inflammatory process by different mechanisms.


Anti-leukopenic and antioxidant effects of cranberry extract in benzene and fluorouracil induced leukopenia in rats

Posted: August 22, 2016
Authors: Hussein M.A., Boshra S.A.
Journal: International Journal of Applied Research in Natural Products. 9 (1) (pp 1-8), 2016

Abstract: The present study was to evaluate anti-leukopenia and antioxidant effects of cranberry extract(222mg/kg.b.w, orally)in 400mg/kg.b.w., orally benzene and/or 20mg/kg.b.w., I.P 5-Flourouracil-induced leukopenia rats. Two weeks after induction of leukopenia in rats, cranberry extract was administrated for 30 consecutive days. Onthe31thday, the rats were sacrificed for the estimation of hemoglobin (Hb%), complete blood cell count Leucocyte (WBC) and platelet count (PLT),as well as biochemical parameters; alanine transaminase (ALT), aspartate transaminase (AST), alkaline phosphatase (ALP), lactate dehydrogenase (LDH), lipid peroxides (TBARS), reduced glutathione (GSH), superoxide dismutase (SOD), catalase (CAT), total cholesterol (TC), triglycerides (TG), HDL-C, LDL-C, p53gene expression, nitric oxide (NO) and tumor necroses factor-alpha (TNF-alpha). The results of this study showed that administration of cranberry extract to leukopenia induced rats demonstrated a significant (P<0.01) increase in Hb%, WBCs and PLT as well as a significant (P<0.01) improvement in biochemical parameters and life span as compared to benzene and/or 5-Flourouracil control rats. The histological examinations of this study revealed damage and degeneration in the lung of benzene and/or 5-Flourouracil treated rats. Also, lung of cranberry treated rats showed significant improvement and protection against benzene and/or 5-Flourouracil harmful effect. On the other hand, the results clearly suggested that the oxidative stress of benzene was higher than 5-Flourouracil. Industrial relevance. Our observations have clearly demonstrated that the cranberry extract has significant antioxidant and anti-leukopenia activity due to presence of phenolic compounds. Cranberry extract possessed a capability to inhibit the lipid peroxidation and activate the antioxidant markers (GSH, SOD and CAT) in leukopenia-induced by 5-Flourouracil and benzene in rats. Also, industrial relevance of the present results showed that cranberry extract can be used as an antioxidant and anti-leukopenia therapeutic agent and deserves clinical trial in the near future as an adjuvant therapy in leukopenic patients. This could serve as a stepping stone towards the discovery of newer safe and effective antitumor agents.


Antibacterial activity of isolated phenolic compounds from cranberry (Vaccinium macrocarpon) against Escherichia coli.

Posted: August 22, 2016
Authors: Rodriguez-Perez, C. Quirantes-Pine, R. Uberos, J. Jimenez-Sanchez, C. Pena, A. Segura-Carretero, A.
Journal: Food and Function; 2016. 7(3):1564-1573.

Abstract: Phenolic compounds from a cranberry extract were isolated in order to assess their contribution to the antibacterial activity against uropathogenic strains of Escherichia coli (UPEC). With this purpose, a total of 25 fractions from a cranberry extract were isolated using semipreparative high performance liquid chromatography (HPLC) and characterized based on the results obtained by reversed-phase HPLC coupled to mass spectrometry detection. Then, the effects on UPEC surface hydrophobicity and biofilm formation of the cranberry extract as well as the purest fractions (a total of 13) were tested. As expected, the whole extract presented a powerful antibacterial activity against UPEC while the selected fractions presented a different behavior. Myricetin and quercitrin significantly decreased (p <0.05) E. coli biofilm formation compared with the control, while dihydroferulic acid glucuronide, procyanidin A dimer, quercetin glucoside, myricetin and prodelphinidin B led to a significant decrease of the surface hydrophobicity compared with the control. The results suggest that apart from proanthocyanidins, other compounds, mainly flavonoids, can act against E. coli biofilm formation and also modify UPEC surface hydrophobicity in vitro, one of the first steps of adhesion.


Atomic force microscopy-guided fractionation reveals the influence of cranberry phytochemicals on adhesion of Escherichia coli.

Posted: August 22, 2016
Authors: Gupta P; Song B; Neto C; Camesano TA.
Journal: Food & Function. 7(6):2655-66, 2016

Abstract: Cranberry juice has been long used to prevent infections because of its effect on the adhesion of the bacteria to the host surface. Proanthocyanidins (PACs) comprise of one of the major classes of phytochemicals found in cranberry, which have been extensively studied and found effective in combating adhesion of pathogenic bacteria. The role of other cranberry constituents in impacting bacterial adhesion haven't been studied very well. In this study, cranberry juice fractions were prepared, characterized and tested for their effect on the surface adhesion of the pathogenic clinical bacterial strain E. coli B78 and non-pathogenic control E. coli HB101. The preparations tested included crude cranberry juice extract (CCE); three fractions containing flavonoid classes including proanthocyanidins, anthocyanins and flavonols; selected sub-fractions, and commercially available flavonol glycoside, quercetin-3-O-galactoside. Atomic force microscopy (AFM) was used to quantify the adhesion forces between the bacterial surface and the AFM probe after the treatment with the cranberry fractions. Adhesion forces of the non-pathogenic, non fimbriated lab strain HB101 are small (average force 0.19 nN) and do not change with cranberry treatments, whereas the adhesion forces of the pathogenic, Dr adhesion E. coli strain B78 (average force of 0.42 nN) show a significant decrease when treated with cranberry juice extract or fractions (average force of 0.31 nN, 0.37 nN and 0.39 nN with CCE, Fraction 7 and Fraction 4 respectively). In particular, the fractions that contained flavonols in addition to PACs were more efficient at lowering the force of adhesion (average force of 0.31 nN-0.18 nN between different sub-fractions containing flavonols and PACs). The sub-fractions containing flavonol glycosides (from juice, fruit and commercial quercetin) all resulted in reduced adhesion of the pathogenic bacteria to the model probe. This strongly suggests the anti adhesive role of other classes of cranberry compounds in conjunction with already known PACs and may have implications for development of alternative anti bacterial treatments.


Beneficial effects of cranberry in the prevention of obesity and related complications: metabolic syndrome and diabetes - a review.

Posted: August 22, 2016
Authors: Kowalska, K. Olejnik, A.
Journal: Journal of Functional Foods; 2016. 20:171-181

Abstract: In recent years, obesity, metabolic syndrome and diabetes are becoming epidemic both in developed and developing countries. Recent experimental and clinical studies have raised interest in the potential health benefits of cranberry consumption in obesity and metabolic syndrome, which appear to be associated with the phytochemical composition of this fruit. Interestingly, cranberry administration has been reported to ameliorate dyslipidemia, hyperglycaemia and oxidative stress in individuals with the metabolic syndrome. This review focuses on the recent findings regarding beneficial effects of cranberry on obesity and metabolic syndrome, and discusses its potential mechanisms of action. The results of studies presented in this review have demonstrated that cranberry ameliorates insulin resistance and plasma lipid profile, decreases diet-induced weight gain and visceral obesity, and diminishes blood markers of oxidative stress. Thus, cranberry could be an effective and safe component of functional foods addressed for individuals with metabolic complications.


Cranberries (Oxycoccus quadripetalus) inhibit pro-inflammatory cytokine and chemokine expression in 3T3-L1 adipocytes.

Posted: August 22, 2016
Authors: Kowalska K., Olejnik A
Journal: Food chemistry. 196 (pp 1137-1143), 2016

Abstract: Oxidative stress and inflammation are involved in the development of obesity, type 2 diabetes and vascular complications. Systemic inflammation, as seen in obesity, is associated with high plasmatic levels of pro-inflammatory, pro-atherogenic and pro-thrombotic adipokines. Here we studied the effects of lyophilized cranberries (LCB) on the secretion and expression of PAI-1, IL-6, MCP-1 and leptin in mature 3T3-L1 adipocytes under baseline conditions and excessive inflammatory response elicitation by stimulation with H2O2. Our data demonstrated that LCB significantly reduced the expression and secretion of IL-6, MCP-1 and leptin, as well as suppressed the overexpression of PAI-1 induced by H2O2. Our findings suggested that LCB counteracted the stimulatory effect of H2O2 on secretion and expression of pro-inflammatory adipokines, implying a potential anti-inflammatory effect during the inflammatory process induced via oxidative stress in adipose tissue.


Cranberries and urinary tract infections: how can the same evidence lead to conflicting advice?

Posted: August 22, 2016
Authors: Liska, D. J. Kern, H. J. Maki, K. C.
Journal: Advances in Nutrition; 2016. 7(3):498-506.

Abstract: Cranberry has been used traditionally to prevent urinary tract infections (UTIs), primarily among generally healthy women prone to recurrent UTIs. Results from a number of published clinical studies have supported this benefit; however, meta-analyses on cranberry and UTI prevention have reported conflicting conclusions. This article explores the methodological differences that contributed to these disparate findings. Despite similar research questions, the meta-analyses varied in the studies that were included, as well as the data that were extracted. In the 2 most comprehensive systematic reviews, heterogeneity was handled differently, leading to an I2 of 65% in one and 43% in the other. Most notably, the populations influencing the conclusions varied. In one analysis, populations with pathological/physiological conditions contributed 75.6% of the total weight to the summary risk estimate (RR: 0.86; 95% CI: 0.71, 1.04); another weighted the evidence relatively equally across UTI populations (RR: 0.62; 95% CI: 0.49, 0.80); and a third included only women with recurrent UTIs (RR: 0.53; 95% CI: 0.33, 0.83). Because women with recurrent UTIs are the group to whom most recommendations regarding cranberry consumption is directed, inclusion of other groups in the efficacy assessment could influence clinical practice quality. Therefore, conclusions on cranberry and UTIs should consider differences in results across various populations studied when interpreting results from meta-analyses.


Cranberry (poly)phenol metabolites correlate with improvements in vascular function: A double-blind, randomized, controlled, dose-response, crossover study

Posted: August 22, 2016
Authors: Rodriguez-Mateos A; Feliciano RP; Boeres A; Weber T; Dos Santos CN; Ventura MR; Heiss C.
Journal: Molecular Nutrition & Food Research. , 2016 May 31

Abstract: SCOPE: Cranberries are rich in potentially bioactive (poly)phenols. The aim of this work was to investigate whether cranberry juice intake can improve vascular function in healthy men in a dose- and time-dependent manner, and to understand which of the circulating (poly)phenol metabolites correlate with vascular effects. METHODS AND RESULTS: A double-blind randomized controlled crossover trial was conducted in 10 healthy males. Flow-mediated dilation (FMD), blood pressure, pulse wave velocity and augmentation index were investigated at baseline, 1, 2, 4, 6, and 8h post-consumption of cranberry juices containing 409, 787, 1238, 1534, and 1910 mg of total cranberry (poly)phenols (TP), and a control drink. Plasma (poly)phenol metabolites were analyzed by UPLC-Q-TOF MS using authentic standards. We observed dose-dependent increases in FMD at 1, 2, 4, 6, and 8h with a peak at 4h and maximal effects with juice containing 1238 mg TP. A total of 60 metabolites were quantified in plasma after cranberry consumption. Twelve (poly)phenol metabolites significantly correlated with the increases in FMD, including ferulic and caffeic acid sulfates, quercetin-3-O-s-D-glucuronide and a gamma-valerolactone sulfate. CONCLUSION: (Poly)phenols in cranberry juice can improve vascular function in healthy males and this is linked to the presence of specific newly identified plasma metabolites.


Cranberry derivatives enhance biofilm formation and transiently impair swarming motility of the uropathogen Proteus mirabilis HI4320.

Posted: August 22, 2016
Authors: O'May, C. Amzallag, O. Bechir, K. Tufenkji, N.
Journal: Can J Microbiol; 2016. 62(6):464-474.

Abstract: Proteus mirabilis is a major cause of catheter-associated urinary tract infection (CAUTI), emphasizing that novel strategies for targeting this bacterium are needed. Potential targets are P. mirabilis surface-associated swarming motility and the propensity of these bacteria to form biofilms that may lead to catheter blockage. We previously showed that the addition of cranberry powder (CP) to lysogeny broth (LB) medium resulted in impaired P. mirabilis swarming motility over short time periods (up to 16 h). Herein, we significantly expanded on those findings by exploring (i) the effects of cranberry derivatives on biofilm formation of P. mirabilis, (ii) whether swarming inhibition occurred transiently or over longer periods more relevant to real infections (~3 days), (iii) whether swarming was also blocked by commercially available cranberry juices, (iv) whether CP or cranberry juices exhibited effects under natural urine conditions, and (v) the effects of cranberry on medium pH, which is an indirect indicator of urease activity. At short time scales (24 h), CP and commercially available pure cranberry juice impaired swarming motility and repelled actively swarming bacteria in LB medium. Over longer time periods more representative of infections (~3 days), the capacity of the cranberry material to impair swarming diminished and bacteria would start to migrate across the surface, albeit by exhibiting a different motility phenotype to the regular "bull's-eye" swarming phenotype of P. mirabilis. This bacterium did not swarm on urine agar or LB agar supplemented with urea, suggesting that any potential application of anti-swarming compounds may be better suited to settings external to the urine environment. Anti-swarming effects were confounded by the ability of cranberry products to enhance biofilm formation in both LB and urine conditions. These findings provide key insights into the long-term strategy of targeting P. mirabilis CAUTIs.


Cranberry proanthocyanidins modulate reactive oxygen species in Barrett's and esophageal adenocarcinoma cell lines.

Posted: August 22, 2016
Authors: Weh, K. M. Aiyer, H. S. Howell, A. B. Kresty, L. A.
Journal: Journal of Berry Research; 2016. 6(2):125-136.

Abstract: BACKGROUND: We recently reported that a cranberry proanthocyanidin rich extract (C-PAC) induces autophagic cell death in apoptotic resistant esophageal adenocarcinoma (EAC) cells and necrosis in autophagy resistant cells. EAC is characterized by high morbidity and mortality rates supporting development of improved preventive interventions. OBJECTIVE: The current investigation sought to investigate the role of reactive oxygen species (ROS) in the context of C-PAC induced cell death. METHODS: Apanel of human esophageal cell lines of EAC or BE (Barrett's esophagus) origin were treated with C-PAC and assessed for ROS modulation using CellROXReg. Green reagent and the Amplex Red assay to specifically measure hydrogen peroxide levels. RESULTS: C-PAC significantly increased ROS levels in EAC cells, but significantly reduced ROS levels in CP-C BE cells. Increased hydrogen peroxide levels were also detected in C-PAC treated EAC cells and supernatant; however, hydrogen peroxide levels were significantly increased in medium alone, without cells, suggesting that C-PAC interferes or directly acts on the substrate. Hydrogen peroxide levels did not change in C-PAC treated CP-C BE cells. CONCLUSION: These experiments provide additional mechanistic insight regarding C-PAC induced cancer cell death through modulation of ROS. Additional research is warranted to identify specific ROS species associated with C-PAC exposure.


Cranberry product decreases fat accumulation in Caenorhabditis elegans.

Posted: August 22, 2016
Authors: Sun Q, Yue Y, Shen P, Yang JJ, Park Y.
Journal: Journal of Medicinal Food; 2016. 19(4):427-433.

Abstract: Cranberry phenolic compounds have been linked to many health benefits. A recent report suggested that cranberry bioactives inhibit adipogenesis in 3T3-L1 adipocytes. Thus, we investigated the effects and mechanisms of the cranberry product (CP) on lipid metabolism using the Caenorhabditis elegans (C. elegans) model. CP (0.016% and 0.08%) dose-dependently reduced overall fat accumulation in C. elegans (N2, wild type) by 43% and 74%, respectively, without affecting its pumping rates or locomotive activities. CP decreased fat accumulation in aak-2 (an ortholog of AMP-activated kinase alpha ) and tub-1 (an ortholog of TUBBY) mutants significantly, but only minimal effects were observed in sbp-1 (an ortholog of sterol response element-binding protein-1) and nhr-49 (an ortholog of peroxisome proliferator-activated receptor- alpha ) mutant strains. We further confirmed that CP downregulated sbp-1, cebp, and hosl-1 (an ortholog of hormone-sensitive lipase homolog) expression, while increasing the expression of nhr-49 in wild-type C. elegans. These results suggest that CP could effectively reduce fat accumulation in C. elegans dependent on sbp-1, cebp, and nhr-49, but not aak-2 and tub-1.


Critical reevaluation of the 4-(dimethylamino)cinnamaldehyde assay: cranberry proanthocyanidin standard is superior to procyanidin A2 dimer for accurate quantification of proanthocyanidins in cranberry products.

Posted: August 22, 2016
Authors: Krueger, C. G. Chesmore, N. Chen Xin Parker, J. Khoo, C. Marais, J. P. J. Shanmuganayagam, D. Crump, P. Reed, J. D.
Journal: Journal of Functional Foods; 2016. 22:13-19.

Abstract: The 4-(dimethylamino)cinnamaldehyde (DMAC) assay is currently used to quantify proanthocyanidin (PAC) content in cranberry products. In a multi-operator/multi-day study design, a cranberry proanthocyanidin (c-PAC) standard was compared to procyanidin A2 (ProA2) dimer for accurate quantification of PAC in commercial cranberry juices, lab generated cranberry blends and cranberry powders. The c-PAC standard reflects the structural heterogeneity of cranberry PAC degree of polymerization, hydroxylation pattern and ratios of 'A-type' to 'B-type' interflavanyl bonds. Use of the c-PAC standard to quantify PAC content in cranberry samples resulted in values that were 3.6 times higher than those determined by ProA2. Overall, there was no effect (P>0.05) of operator or day on estimation of PAC concentration. The adoption of c-PAC standard should be considered as an improvement over the use of ProA2 for accurate quantification of cranberry PAC. Improved standardization of bioactive PAC components in functional cranberry foods will aid in establishment of dosage guidelines.


Deleterious effect of p-cresol on human colonic epithelial cells prevented by proanthocyanidin-containing polyphenol extracts from fruits and proanthocyanidin bacterial metabolites.

Posted: August 22, 2016
Authors: Wong X; Carrasco-Pozo C; Escobar E; Navarrete P; Blachier F; Andriamihaja M; Lan A; Tome D; Cires MJ; Pastene E; Gotteland M.
Journal: Journal of Agricultural and Food Chemistry; 2016. 64(18):3574-3583

Abstract: The protective effect of proanthocyanidin-containing polyphenol extracts from apples, avocados, cranberries, grapes, or proanthocyanidin microbial metabolites was evaluated in colonic epithelial cells exposed to p-cresol, a deleterious compound produced by the colonic microbiota from L-tyrosine. In HT29 Glc-/+ cells, p-cresol significantly increased LDH leakage and decreased ATP contents, whereas in Caco-2 cell monolayers, it significantly decreased the transepithelial electrical resistance and increased the paracellular transport of FITC-dextran. The alterations induced by p-cresol in HT29 Glc-/+ cells were prevented by the extracts from cranberries and avocados, whereas they became worse by extracts from apples and grapes. The proanthocyanidin bacterial metabolites decreased LDH leakage, ameliorating cell viability without improving intracellular ATP. All of the polyphenol extracts and proanthocyanidin bacterial metabolites prevented the p-cresol-induced alterations of barrier function. These results suggest that proanthocyanidin-containing polyphenol extracts and proanthocyanidin metabolites likely contribute to the protection of the colonic mucosa against the deleterious effects of p-cresol.


Effect of cranberry (Vaccinium macrocarpon) oligosaccharides on the formation of advanced glycation end-products.

Posted: August 22, 2016
Authors: Sun J, Liu W, Ma H, Marais JPJ, Khoo C, Dain JA, Rowley DC, Seeram NP
Journal: Journal of Berry Research; 2016. 6(2):149-158

Abstract: BACKGROUND: The formation and accumulation of advanced glycation end-products (AGEs) are implicated in several chronic human illnesses including type-2 diabetes, renal failure, and neurodegenerative diseases. The cranberry (Vaccinium macrocarpon) fruit has been previously reported to show anti-AGEs effects, attributed primarily to its phenolic constituents. However, there is lack of similar data on the non-phenolic constituents found in the cranberry fruit, in particular, its carbohydrate constituents. Herein, a chemically characterized oligosaccharide-enriched fraction purified from the cranberry fruit was evaluated for its potential anti-AGEs and free radical scavenging effects. OBJECTIVE: The aim of this study was to evaluate the in vitro anti-AGEs and free radical scavenging effects of a chemically characterized oligosaccharide-enriched fraction purified from the North American cranberry (Vaccinium macrocarpon) fruit. METHOD: The cranberry oligosaccharide-enriched fraction was purified from cranberry hull powder and characterized based on spectroscopic and spectrometric (NMR, MALDI-TOF-MS, and HPAEC-PAD) data. The oligosaccharide-enriched fraction was evaluated for its anti-AGEs and free radical scavenging effects by the bovine serum albumin-fructose, and DPPH assays, respectively. RESULTS: Fractionation of cranberry hull material yielded an oligosaccharide-enriched fraction named Cranf1b-CL. The 1H NMR and MALDI-TOF-MS revealed that Cranf1b-CL consists of oligosaccharides ranging primarily from 6-mers to 9-mers. The monosaccharide composition of Cranf1b-CL was arabinose (25%), galactose (5%), glucose (47%) and xylose (23%). In the bovine serum albumin-fructose assay, Cranf1b-CL inhibited AGEs formation in a concentration-dependent manner with comparable activity to the synthetic antiglycating agent, aminoguanidine, used as the positive control (57 vs. 75%; both at 500 micro g/mL). In the DPPH free radical scavenging assay, Cranf1b-CL showed superior activity to the synthetic commercial antioxidant, butylated hydroxytoluene, used as the positive control (IC50=680 vs. 2200 micro g/mL, respectively). CONCLUSION: The in vitro anti-AGEs and free radical scavenging effects of cranberry oligosaccharides support previous data suggesting that these constituents may also contribute to biological effects of the whole fruit beyond its phenolic constituents alone. Also, this is the first study to evaluate a chemically characterized oligosaccharide fraction purified from the North American cranberry fruit for anti-AGEs and free radical scavenging properties.


Effect of glycated albumin and cranberry components on interleukin-6 and matrix metalloproteinase-3 production by human gingival fibroblasts

Posted: August 22, 2016
Authors: Tipton DA; Hatten AA; Babu JP; Dabbous MKh.
Journal: Journal of Periodontal Research. 51(2):228-36

Abstract: BACKGROUND AND OBJECTIVE: Gingival fibroblasts have the potential to participate in periodontal inflammation and breakdown, producing interleukin (IL)-6 and matrix metalloproteinase (MMP)-3. Advanced glycation end products (AGEs), formed during diabetic hyperglycemia, might aggravate periodontal inflammation. The cranberry contains anti-inflammatory polyphenols, which inhibit proinflammatory activities of lipopolysaccharide (LPS)- and IL-1beta-stimulated human cells. Little is known of its effects on gingival fibroblast IL-6 or MMP-3 production stimulated by AGEs. The objectives were to determine cranberry effects on IL-6 and MMP-3 production by gingival fibroblasts exposed to the representative AGE, glycated human serum albumin (G-HSA), or LPS +/- G-HSA. MATERIAL AND METHODS: Cranberry high molecular weight non-dialyzable material (NDM), was derived from cranberry juice. Normal human gingival fibroblasts were incubated with G-HSA or normal HSA or Porphyromonas gingivalis LPS (1 mug/mL) +/- G-HSA, in the presence or absence of preincubation with NDM. IL-6 and MMP-3 were measured by enzyme-linked immunosorbent assay. Data were analyzed using one-way analysis of variance and Scheffe's F procedure. RESULTS: IL-6 production was stimulated by G-HSA or LPS (p < 0.01), which was inhibited in both cases by NDM (p < 0.002). [G-HSA+LPS] synergistically stimulated IL-6 production (p < 0.0001), which was inhibited by NDM. MMP-3 levels were not stimulated by G-HSA but were decreased by LPS (p < 0.02). [G-HSA+LPS] increased MMP-3 production significantly, vs. LPS (p = 0.0005). NDM inhibited MMP-3 levels in the presence of G-HSA or LPS, and in the presence of [G-HSA+LPS] (p < 0.0001). CONCLUSIONS: G-HSA +/- LPS may have differential effects on IL-6 and MMP-3 production by human gingival fibroblasts, but both are inhibited by NDM. The study suggests that cranberry phenols may be useful in regulating the host response and perhaps treating periodontitis in patients with poorly controlled diabetes.


Effect of oral cranberry extract (standardized proanthocyanidin-A) in patients with recurrent UTI by pathogenic E. coli: a randomized placebo-controlled clinical research study.

Posted: August 22, 2016
Authors: Singh I; Gautam LK; Kaur IR.
Journal: International Urology & Nephrology. , 2016 Jun 17

Abstract: PURPOSE: To evaluate the effect of cranberry extract (PAC-A ~ proanthocyanidin-A) on the in vitro bacterial properties of uropathogenic (E. coli) and its efficacy/tolerability in patients with subclinical or uncomplicated recurrent UTI (r-UTI). MATERIALS AND METHODS: After obtaining clearance from the ethics committee and administering a written informed consent, 72 patients with r-UTI were enrolled as per protocol (November 2011 to March 2013) in this prospective study, to randomly receive (PAC-A: group I, 36) or (placebo: group II, 36), for 12 weeks. Any change/reduction in the incidence of r-UTI at 12 weeks was construed to be the primary endpoint of this study. RESULTS: After 12 weeks, bacterial adhesion scoring decreased (0.28)/(2.14) in group I/II (p < 0.001); 32/36 (88.8 %) and 2/36 (5.5 %) in groups I and II, respectively, turned MRHA negative (p < 0.001); biofilm (p < 0.01) and bacterial growth (p < 0.001) decreased in group I; microscopic pyuria score was 0.36/2.0 in group I/II (p < 0.001); r-UTI decreased to 33.33 versus 88.89 % in group I/II (p < 0.001); mean subjective dysuria score was 0.19 versus 1.47 in group I/II (p < 0.001), while mean urine pH was 5.88 versus 6.30 in group I/II (p < 0.001). No in vitro antibacterial activity of cranberry could be demonstrated, and no adverse events were noted. CONCLUSIONS: The overall efficacy and tolerability of standardized cranberry extract containing (PAC-A) as a food supplement were superior to placebo in terms of reduced bacterial adhesion; bacterial MRHA negativity; urine pH reduction; and in preventing r-UTI (dysuria, bacteriuria and pyuria). Larger randomized controlled trials are needed to elucidate the precise role, exact dose and optimal duration of PAC-A therapy in patients at risk of r-UTI.


Effectiveness of a Combination of Cranberries, Lactobacillus rhamnosus, and Vitamin C for the Management of Recurrent Urinary Tract Infections in Women: Results of a Pilot Study.

Posted: August 22, 2016
Authors: Montorsi F; Gandaglia G; Salonia A; Briganti A; Mirone V.
Journal: European Urology. , 2016 Jun 7

Abstract: Urinary tract infections (UTIs) are common in women and many patients with recurrent UTIs do not eradicate the condition albeit being treated with multiple courses of antibiotics. The use of nutritional supplements might reduce the risk of recurrent UTIs. However, the role of supplements taken as single agents appears to be limited. We hypothesized that a combination of cranberries, Lactobacillus rhamnosus, and vitamin C might produce a clinical benefit due to their additive or synergistic effects. We prospectively enrolled 42 consecutive women with recurrent UTIs treated with 120mg cranberries (minimum proanthocyanidin content: 32mg), 1 billion heat-killed L. rhamnosus SGL06, and 750mg vitamin C thrice daily for 20 consecutive d. Patients were advised to stop taking these supplements for 10 d and then to repeat the whole cycle three times. Patients were contacted three mo and six mo following the end of the administration of these supplements and evaluated with a semistructured interview and urinalysis. Responders were defined as the absence of symptoms and negative urinalysis or urine culture. Follow-up data were available for 36 patients. Overall, 26 (72.2%) and 22 patients (61.1%) were responders at the 3-mo and 6-month follow-up. No major side effects were recorded. The administration of cranberries, L. rhamnosus, and vitamin C might represent a safe and effective option in women with recurrent UTIs.


Effects of cranberry components on IL-1beta-stimulated production of IL-6, IL-8 and VEGF by human TMJ synovial fibroblasts.

Posted: August 22, 2016
Authors: Tipton DA; Christian J; Blumer A.
Journal: Archives of Oral Biology. 68:88-96, 2016 Aug

Abstract: OBJECTIVE: Osteoarthritis (OA) in the TMJ is characterized by deterioration of articular cartilage and secondary inflammatory changes. Interleukin-1beta (IL-1beta) stimulates IL-6, IL-8, and vascular endothelial growth factor (VEGF) in synovial fluid of TMJ with internal derangement and bony changes. The cranberry (Vaccinium macrocarpon) contains polyphenolic compounds that inhibit production of pro-inflammatory molecules by gingival cells in response to several stimulators. This study examined effects of cranberry components on IL-1beta-stimulated IL-6, IL-8, and VEGF production by human TMJ synovial fibroblast-like cells. DESIGN: Cranberry high molecular weight non-dialyzable material (NDM) was derived from cranberry juice. Human TMJ synovial fibroblast-like cells from joints with degenerative OA and an ankylosed TMJ without degeneration were incubated with IL-1beta (0.001-1nM)+/-NDM (25-250mug/ml) (2h preincubation). Viability was assessed via activity of a mitochondrial enzyme. IL-6, IL-8, and VEGF in culture supernatants were measured by ELISA; NF-kappaB and AP-1 transcription factors were measured in nuclear extracts via binding to specific oligonucleotides. DATA ANALYSIS: ANOVA and Scheffe's F procedure for post hoc comparisons. RESULTS: NDM did not affect cell viability but inhibited IL-1beta stimulated IL-6, IL-8, and VEGF production in all cell lines (p<0.05). NDM partially reduced nuclear levels of NF-kappaB and AP-1 (p<0.04), depending upon cell line and time of exposure to IL-1beta+NDM. CONCLUSION: Cranberry NDM inhibition of IL-1beta-stimulated IL- 6, IL-8, and VEGF production by TMJ synovial fibroblast-like cells suggests that cranberry components may be useful as a host modulatory therapeutic agent to prevent or treat inflammatory arthropathies of the TMJ.


Effects of cranberry extract on prevention of urinary tract infection in dogs and on adhesion of Escherichia coli to Madin-Darby canine kidney cells.

Posted: August 22, 2016
Authors: Chou HI, Chen KS, Wang HC,Lee WM
Journal: American Journal of Veterinary Research; 2016. 77(4):421-427.

Abstract: OBJECTIVE: To determine effects of cranberry extract on development of urinary tract infection (UTI) in dogs and on adherence of Escherichia coli to Madin-Darby canine kidney (MDCK) cells. ANIMALS: 12 client-owned dogs (in vivo experiment) and 6 client-owned dogs (in vitro experiment). PROCEDURES: 12 dogs with a history of recurrent UTI received an antimicrobial (n=6) or cranberry extract (6) orally for 6 months. Dogs were monitored for a UTI. For the in vitro experiment, cranberry extract was orally administered to 6 dogs for 60 days. Voided urine samples were collected from each dog before and 30 and 60 days after onset of extract administration. Urine was evaluated by use of a bacteriostasis assay. An antiadhesion assay and microscopic examination were used to determine inhibition of bacterial adherence to MDCK cells. RESULTS: None of the 12 dogs developed a UTI. The bacteriostasis assay revealed no zone of inhibition for any urine samples. Bacterial adhesion was significantly reduced after culture with urine samples obtained at 30 and 60 days, compared with results for urine samples obtained before extract administration. Microscopic examination revealed that bacterial adherence to MDCK cells was significantly reduced after culture with urine samples obtained at 30 and 60 days, compared with results after culture with urine samples obtained before extract administration. CONCLUSIONS AND CLINICAL RELEVANCE: Oral administration of cranberry extract prevented development of a UTI and prevented E. coli adherence to MDCK cells, which may indicate it has benefit for preventing UTIs in dogs.


Identification and quantification of novel cranberry-derived plasma and urinary (poly)phenols.

Posted: August 22, 2016
Authors: Feliciano R.P., Boeres A., Massacessi L., Istas G., Ventura M.R., Nunes Dos Santos C., Heiss C., Rodriguez-Mateos A.
Journal: Archives of Biochemistry and Biophysics. 599 (pp 31-41), 2016

Abstract: Cranberries are a rich source of (poly)phenols, in particular proanthocyanidins, anthocyanins, flavonols, and phenolic acids. However, little is known about their bioavailability in humans. We investigated the absorption, metabolism, and excretion of cranberry (poly)phenols in plasma and urine of healthy young men after consumption of a cranberry juice (787 mg (poly)phenols). A total of 60 cranberry-derived phenolic metabolites were identified using UPLC-Q-TOF-MS analysis with authentic standards. These included sulfates of pyrogallol, valerolactone, benzoic acids, phenylacetic acids, glucuronides of flavonols, as well as sulfates and glucuronides of cinnamic acids. The most abundant plasma metabolites were small phenolic compounds, in particular hippuric acid, catechol-O-sulfate, 2,3-dihydroxybenzoic acid, phenylacetic acid, isoferulic acid, 4-methylcatechol-O-sulfate, alpha-hydroxyhippuric acid, ferulic acid 4-O-sulfate, benzoic acid, 4-hydroxyphenyl acetic acid, dihydrocaffeic acid 3-O-sulfate, and vanillic acid-4-O-sulfate. Some benzoic acids, cinnamic acids, and flavonol metabolites appeared in plasma early, at 1-2 h post-consumption. Others such as phenylacetic acids, benzaldehydes, pyrogallols, catechols, hippuric and dihydrocinnamic acid derivatives appear in plasma later (Tmax 4-22 h). The 24 h urinary recovery with respect to the amount of (poly)phenols consumed was 6.2%. Our extensive description of the bioavailability of cranberry (poly)phenols lays important groundwork necessary to start understanding the fate of these compounds in humans.


Inhibition of herpes simplex type 1 and type 2 infections by Oximacro, a cranberry extract with a high content of A-type proanthocyanidins (PACs-A)

Posted: August 22, 2016
Authors: Terlizzi ME; Occhipinti A; Luganini A; Maffei ME; Gribaudo G.
Journal: Antiviral Research. 132 (pp 154-164),

Abstract: In the absence of efficient preventive vaccines, topical microbicides offer an attractive alternative in the prevention of Herpes simplex type 1 (HSV-1) and type 2 (HSV-2) infections. Because of their recognized anti-adhesive activity against bacterial pathogens, cranberry (Vaccinium macrocarpon Ait.) extracts may represent a natural source of new antiviral microbicides. However, few studies have addressed the applications of cranberry extract as a direct-acting antiviral agent. Here, we report on the ability of the novel cranberry extract Oximacro and its purified A-type proanthocyanidins (PACs-A), to inhibit HSV-1 and HSV-2 replication in vitro. Analysis of the mode of action revealed that Oximacro prevents adsorption of HSV-1 and HSV-2 to target cells. Further mechanistic studies confirmed that Oximacro and its PACs-A target the viral envelope glycoproteins gD and gB, thus resulting in the loss of infectivity of HSV particles. Moreover, Oximacro completely retained its anti-HSV activity even at acidic pHs (3.0 and 4.0) and in the presence of 10% human serum proteins; conditions that mimic the physiological properties of the vagina - a potential therapeutic location for Oximacro. Taken together, these findings indicate Oximacro as an attractive candidate for the development of novel microbicides of natural origin for the prevention of HSV infections.


Liquid chromatography with tandem mass spectrometry quantification of urinary proanthocyanin A2 dimer and its potential use as a biomarker of cranberry intake

Posted: August 22, 2016
Authors: Walsh J.M., Ren X., Zampariello C., Polasky D.A., McKay D.L., Blumberg J.B., Chen C.-Y.O.
Journal: Journal of Separation Science. 39 (2) (pp 342-349), 2016.

Abstract: The lack of a biomarker for the consumption of cranberries has confounded the interpretation of several studies investigating the effect of cranberry products, especially juices, on health outcomes. The objectives of this pilot study were to develop a liquid chromatography tandem mass spectrometric method for the quantification of the proanthocyanin dimer A-2 in human urine and validate urinary proanthocyanin dimer A-2 as a biomarker of cranberry intake. Five healthy, nonsmoking, premenopausal women (20-30 years of age, body mass index: 18.5-25 kg/m2) were assigned to consume a cranberry beverage containing 140 mg proanthocyanin and 35 kilocalories at 237 mL/day, according to a weekly dosing schedule for 7 weeks. Eleven 24 h and morning spot urine samples each were collected from each subject. A reliable, sensitive method for the detection of proanthocyanin dimer A-2 in urine using liquid chromatography with tandem mass spectrometry was developed with a limit of quantitation of 0.25 ng/mL and a relative standard deviation of 7.26%, precision of 5.7%, and accuracy of 91.7%. While proanthocyanin dimer A-2 was quantifiable in urine, it did not appear to be excreted in a concentration that corresponded to the dosing schedule and intake of cranberry juice.


NMR-based metabolomics reveals urinary metabolome modifications in female Sprague-Dawley rats by cranberry procyanidins.

Posted: August 22, 2016
Authors: Liu H., Tayyari F., Edison A.S., Su Z., Gu L.
Journal: Journal of Nutritional Biochemistry. 34 (pp 136-145), 2016

Abstract: A 1H NMR global metabolomics approach was used to investigate the urinary metabolome changes in female rats gavaged with partially purified cranberry procyanidins (PPCP) or partially purified apple procyanidins (PPAP). After collecting 24-h baseline urine, 24 female Sprague-Dawley rats were randomly separated into two groups and gavaged with PPCP or PPAP twice using a dose of 250 mg extracts per kilogram body weight. The 24-h urine samples were collected after the gavage. Urine samples were analyzed using 1H NMR. Multivariate analyses showed that the urinary metabolome in rats was modified after administering PPCP or PPAP compared to baseline urine metabolic profiles. 2D 1H-13C HSQC NMR was conducted to assist identification of discriminant metabolites. An increase of hippurate, lactate and succinate and a decrease of citrate and alpha-ketoglutarate were observed in rat urine after administering PPCP. Urinary levels of d-glucose, d-maltose, 3-(3'-hydroxyphenyl)-3-hydroxypropanoic acid, p-hydroxyphenylacetic acid, formate and phenol increased but citrate, alpha-ketoglutarate and creatinine decreased in rats after administering PPAP. Furthermore, the NMR analysis showed that the metabolome in the urine of rats administered with PPCP differed from those gavaged with PPAP. Compared to PPAP, PPCP caused an increase of urinary excretion of hippurate but a decrease of 3-(3'-hydroxyphenyl)-3-hydroxypropanoic acid, p-hydroxyphenylacetic acid and phenol. These metabolome changes caused by cranberry procyanidins may help to explain its reported health benefits and identify biomarkers of cranberry procyanidin intake.


Prevention of urinary tract infection with OximacroReg., a cranberry extract with a high content of A-type proanthocyanidins: a pre-clinical double-blind controlled study.

Posted: August 22, 2016
Authors: Occhipinti, A. Germano, A. Maffei, M. E.
Journal: Urology Journal; 2016. 13(2):2640-2649.

Abstract: Purpose: Urinary tract infections (UTIs) are widespread and affect a large portion of the human population. Cranberry juices and extracts have been used for UTI prevention due to their content of bioactive proanthocyanidins (PACs), particularly of the A type (PAC-A). Controversial clinical results obtained with cranberry are often due to a lack of precise determination and authentication of the PAC-A content. This study used OximacroReg. (Biosfered S.r.l., Turin, Italy), a cranberry extract with a high content of PAC-A, to prevent UTIs in female and male volunteers. Materials and Methods: The OximacroReg. PACs content was assayed using the Brunswick Laboratories 4-dimethylaminocinnamaldehyde (BL-DMAC) method, and the dimer and trimer PACs-A and PACs-B percentages were determined via high-performance liquid chromatography/electrospray ionization tandem mass spectrometry (HPLC/ESI-MS/MS). A balanced group of female (ranging from 19 to over 51 years) and male volunteers (over 51 years) was divided into two groups. The experimental group received 1 capsule containing OximacroReg. (36 mg PACs-A) twice per day (morning and evening) for 7 days, and the placebo group was given the same number of capsules with no PACs. Results: Analysis of OximacroReg. revealed a high total PAC content (372.34 mg/g+or-2.3) and a high percentage of PAC-A dimers and trimers (86.72%+or-1.65). After 7 days of OximacroReg. administration, a significant difference was found between the placebo and OximacroReg. groups for both females (Mann-Whitney U-test=875; P=.001; n=60) and males (Mann-Whitney U-test=24; P=.016; n=10). When the female and male age ranges were analysed separately, the female age range 31-35 showed only slightly significant differences between the placebo and OximacroReg. groups (Mann-Whitney U-test=20.5; P=.095; n=10), whereas all other female age ranges showed highly significant differences between the placebo and OximacroReg. groups (Mann-Whitney U-test=25; P=.008; n=10). Furthermore, colony forming unit/mL counts from the urine cultures showed a significant difference (P<.001) between the experimental and the placebo groups (SD difference=51688; df=34, t=-10.27; Dunn-Sidak Adjusted P<.001, Bonferroni Adjusted P<.001). Conclusion: Careful determination of the total PAC content using the BL-DMAC method and the authentication of PACs-A with mass spectrometry in cranberry extracts are necessary to prepare effective doses for UTI prevention. A dose of 112 mg OximacroReg. containing 36 mg PACs-A was found to be effective in preventing UTIs when used twice per day for 7 days.


Review of dried fruits: phytochemicals, antioxidant efficacies, and health benefits.

Posted: August 22, 2016
Authors: Chang SK, Alasalvar C, Shahidi F
Journal: Journal of Functional Foods; 2016. 21:113-132.

Abstract: Dried fruits, which serve as important healthful snacks worldwide, provide a concentrated form of fresh fruits. They are nutritionally equivalent to fresh fruits in smaller serving sizes, ranging from 30 to 43 g depending on the fruit, in current dietary recommendation in different countries. Daily consumption of dried fruits is recommended in order to gain full benefit of essential nutrients, health-promoting phytochemicals, and antioxidants that they contain, together with their desirable taste and aroma. Recently, much interest in the health benefits of dried fruits has led to many in vitro and in vivo (animal and human intervention) studies as well as the identification and quantification of various groups of phytochemicals. This review discusses phytochemical compositions, antioxidant efficacies, and potential health benefits of eight traditional dried fruits such as apples, apricots, dates, figs, peaches, pears, prunes, and raisins, together with dried cranberries. Novel product formulations and future perspectives of dried fruits are also discussed. Research findings from the existing literature published within the last 10 years have been compiled and summarised.


The efficacy of blueberry and grape seed extract combination on triple therapy for Helicobacter pylori eradication: a randomised controlled trial.

Posted: August 22, 2016
Authors: Chua CS; Yang KC; Chen JH; Liu YH; Hsu YH; Lee HC; Huang SY.
Journal: International Journal of Food Sciences and Nutrition; 2016. 67(2):177-183.

Abstract: Helicobacter pylori is a major risk factor for gastritis, gastric ulcers and gastric cancer. Traditional therapy with proton pump inhibitor and antibiotics is regarded as optimal for H. pylori eradication whereas, the eradication rate is unsatisfactory. Studies have reported that cranberry may inhibit H. pylori adhesion to the human gastric mucus but lack of other berry extracts have been evaluated in clinical study. Thus, a 9-week add-on randomised controlled trial was conducted to explore the impact of blueberry and grape seed extract (BGE) combinations traditional therapy for H. pylori eradication. In results, we found that there was no significant difference of eradication rate between the berry extract group and placebo group in the intention-to-treat analysis and in the per-protocol analysis (94.64% versus 84.62%, p=0.085). Diarrhoea, constipation and epigastric pain were observed increasing during ingestion of the berry extract in some cases. In conclusion, this study indicated that no significant difference existed between the BGE extract group and placebo group in eradication rate under triple therapy.


Triggering Akkermansia with dietary polyphenols: A new weapon to combat the metabolic syndrome?

Posted: August 22, 2016
Authors: Anhe FF; Pilon G; Roy D; Desjardins Y; Levy E; Marette A
Journal: Gut Microbes. 7(2):146-53

Abstract: The gut and its bacterial colonizers are now well characterized as key players in whole-body metabolism, opening new avenues of research and generating great expectation for new treatments against obesity and its cardiometabolic complications. As diet is the main environmental factor affecting the gut microbiota, it has been suggested that fruits and vegetables, whose consumption is strongly associated with a healthy lifestyle, may carry phytochemicals that could help maintain intestinal homeostasis and metabolic health. We recently demonstrated that oral administration of a cranberry extract rich in polyphenols prevented diet-induced obesity and several detrimental features of the metabolic syndrome in association with a remarkable increase in the abundance of the mucin-degrading bacterium Akkermansia in the gut microbiota of mice. This addendum provides an extended discussion in light of recent discoveries suggesting a mechanistic link between polyphenols and Akkermansia, also contemplating how this unique microorganism may be exploited to fight the metabolic syndrome.


Impact of Cranberries on Gut Microbiota and Cardiometabolic Health: Proceedings of the Cranberry Health Research Conference 2015

Posted: August 3, 2016
Authors: Blumberg JB, Basu A, Krueger CG, Lila MA, Neto CC, Novotny JA, Reed JD, Rodriguez-Mateos A, Toner CD
Journal: Advances in Nutrition. 2016;7:759S-770S. doi: 10.3945/an.116.012583

Abstract:

Recent advances in cranberry research have expanded the evidence for the role of this Vaccinium berry fruit in modulating gut microbiota function and cardiometabolic risk factors. The A-type structure of cranberry proanthocyanidins seems to be responsible for much of this fruit’s efficacy as a natural antimicrobial. Cranberry proanthocyanidins interfere with colonization of the gut by extraintestinal pathogenic Escherichia coli in vitro and attenuate gut barrier dysfunction caused by dietary insults in vivo. Furthermore, new studies indicate synergy between these proanthocyanidins, other cranberry components such as isoprenoids and xyloglucans, and gut microbiota. Together, cranberry constituents and their bioactive catabolites have been found to contribute to mechanisms affecting bacterial adhesion, coaggregation, and biofilm formation that may underlie potential clinical benefits on gastrointestinal and urinary tract infections, as well as on systemic anti-inflammatory actions mediated via the gut microbiome. A limited but growing body of evidence from randomized clinical trials reveals favorable effects of cranberry consumption on measures of cardiometabolic health, including serum lipid profiles, blood pressure, endothelial function, glucoregulation, and a variety of biomarkers of inflammation and oxidative stress. These results warrant further research, particularly studies dedicated to the elucidation of dose-response relations, pharmacokinetic/metabolomics profiles, and relevant biomarkers of action with the use of fully characterized cranberry products. Freeze-dried whole cranberry powder and a matched placebo were recently made available to investigators to facilitate such work, including interlaboratory comparability.

Link to full text article: http://advances.nutrition.org/content/7/4/759S.full


Consumption of a cranberry juice beverage lowered the number of clinical urinary tract infection episodes in women with a recent history of urinary tract infection

Posted: June 14, 2016
Authors: Kevin C Maki, Kerrie L Kaspar, Christina Khoo, Linda H Derrig, Arianne L Schild, and Kalpana Gupta
Journal: American Journal of Clinical Nutrition. 103 (6) (pp 1434-1442), 2016

Abstract:

Objective: We assessed the effects of the consumption of a cranberry beverage on episodes of clinical UTIs.

Design: In this randomized, double-blind, placebo-controlled, multicenter clinical trial, women with a history of a recent UTI were assigned to consume one 240-mL serving of cranberry beverage/d (n = 185) or a placebo (n = 188) beverage for 24 wk. The primary outcome was the clinical UTI incidence density, which was defined as the total number of clinical UTI events (including multiple events per subject when applicable) per unit of observation time.

Results: The dates of the random assignment of the first subject and the last subject’s final visit were February 2013 and March 2015, respectively. The mean age was 40.9 y, and characteristics were similar in both groups. Compliance with study product consumption was 98%, and 86% of subjects completed the treatment period in both groups. There were 39 investigator-diagnosed episodes of clinical UTI in the cranberry group compared with 67 episodes in the placebo group (antibiotic use–adjusted incidence rate ratio: 0.61; 95% CI: 0.41, 0.91; P = 0.016). Clinical UTI with pyuria was also significantly reduced (incidence rate ratio: 0.63; 95% CI: 0.40, 0.97; P = 0.037). One clinical UTI event was prevented for every 3.2 woman-years (95% CI: 2.0, 13.1 woman-years) of the cranberry intervention. The time to UTI with culture positivity did not differ significantly between groups (HR: 0.97; 95% CI: 0.56, 1.67; P = 0.914).

Conclusion: The consumption of a cranberry juice beverage lowered the number of clinical UTI episodes in women with a recent history of UTI. This study was registered at clinicaltrials.gov as NCT01776021.

Full article: http://ajcn.nutrition.org/content/103/6/1434.full