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Abstract

Cranberry fruit (Vaccinium macrocarpon) grows on evergreen shrubs that are native to North America. Cranberry is a term derived from the contraction of ‘‘crane berry.’’ This name is derived from the nickname of the bilberry flower, which, when it withers, is similar in appearance to the head and neck of the sand crane, a bird that often feeds on the berries of this plant. The cranberry is part of the Ericaceae family and naturally grows in acidic swamps full of peat moss in humid forests. Cranberries are composed of water (88%), organic acids (including salicylate), fructose, vitamin C (high levels, i.e., 200 mg/kg of fresh berries), flavonoids, anthocyanidins, catechins, and triterpinoids. The chemical constituents responsible for their taste are the iridoid glycosides. The anthocyanidins and proanthocyanidins (PAC) are tannins (stable polyphenols) found only in vaccinium berries and function as a natural plant defense system against microbes. Common preparations with cranberries include fresh, whole berries, gelatinized products, juices (usually 10-25% pure juice) and capsules. Pure juice is too acidic (pH, 2.5) and unpalatable, even with sweeteners .Despite cranberry presentation, it is generally recommended to consume cranberries just prior or two hours after meals; it is also important to drink lots of water, mainly after preparations from dehydrated juices. Cranberry juice, predominantly in the form of a juice cocktail drink with approximately 25% cranberry juice, has been the traditional choice of most women seeking to prevent Urinary Tract Infections (UTIs). American cranberry has a complex and rich phytochemical composition, particularlyflavan-3-ols, A-type procyanidins (PACs), anthocyanins, benzoic acid, and ursolic acid. Cranberryflavan-3-ols are present as monomers, oligomers, and polymers). These oligomers and polymers are also referred to as PACs or condensed tannins and representw85% of the total flavan-3-ols on a weight basis. Cranberry is the main source of peonidin among 100 foods commonly consumed in the United States. Quercetin 3-galactoside is the predominant form, but at least 11 other glycosides are present in lower concentrations. Some of these, such as quercetin-3-acetylrhamnoside are rare in berries. In the Phenol Explorer database, the flavonol content of plant foods is usually <3 mg/100 g FW, although bilberry, black-berry, and blueberry contain 3.2–17 mg/kg. Cranberry fruit is classed as a functional food due to the naturally high content of compounds, such as polyphenols, which are believed to have antioxidant and therefore health-promoting properties. Health benefits of cranberry consumption range from cardio protective effects due to improved cholesterol profiles to aiding digestive health. Cranberry exists in various forms, including the raw fruit (fresh and dried), cranberry juice and cranberry extract in capsule/tablet formulations. Cranberry extract could be a potential alternative to antibiotics to treat acute uncomplicated UTIs. Proanthocyanidin (PAC) with A-type linkages, or their metabolites, is believed to be the active ingredient in cranberry, preventing Escherichia coli (E. coli) from binding to the bladder uroepithelium and thereby reducing the ability of E. coli to cause and sustain a UTI. Cranberries have also been found to improve lipid profile, improve endothelial function, and lower several markers of cardio metabolic risk. Nowadays, growing evidence suggests an important role of cranberries in maintaining digestive health. In addition to the anti-inflammatory effects, cranberries may also influence intestinal barrier integrity, which is another essential element of intestinal health. Cranberry was reported as the main source of peonidin among 100 foods commonly consumed in the United States. However, in the majority of studies, the total anthocyanin content is re-ported rather than amounts of individual anthocyanins. This approach may change because the bioavailability and health effects of anthocyanins seem to be affected by the structures of the aglyconesor the glycosidicmoieties . Quercetin 3-galactoside is the predominant form, but at least 11 other glycosides are present in lower concentrations. Some of these, such as quercetin-3-acetylrhamnoside are rare in berries. As shown in the Phenol Explorer database, the flavonol content of plant foods is usually <3 mg/100 g FW, although bilberry, black-berry, and blueberry contain 3.2–17 mg/kg.
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Safe Treatment of Urinary Tract Infections by American
Cranberry
Muhammad Arshad Ullah 1*, Ali Hassan 2 and Ameer Hamza 3
1 Pakistan Agricultural Research Council, Islamabad, Pakistan.
2 PMAS- University of Arid Agriculture, Rawalpindi, Pakistan.
3 COMSATS- Biosciences Department, Islamabad Campus, Pakistan.
*Corresponding author: Muhammad Arshad Ullah, Pakistan Agricultural Research Council, Islamabad, Pakistan.
Received date: April 14, 2023; Accepted date: June 12, 2023; Published date: June 26, 2023
Citation: Muhammad A. Ullah, Ali Hassan and Ameer Hamza (2023), Safe Treatment of Urinary Tract Infections by American Cranberry, J.
Nutrition and Food Processing, 6(5); DOI:10.31579/2637-8914/138
Copyright: © 2023, Naseem Zahra. This is an open access article distributed under the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract:
Cranberry fruit (Vaccinium macrocarpon) grows on evergreen shrubs that are native to North America. Cranberry is
a term derived from the contraction of ‘‘crane berry.’’ This name is derived from the nickname of the bilberry flower,
which, when it withers, is similar in appearance to the head and neck of the sand crane, a bird that often feeds on the
berries of this plant. The cranberry is part of the Ericaceae family and naturally grows in acidic swamps full of peat
moss in humid forests. Cranberries are composed of water (88%), organic acids (including salicylate), fructose,
vitamin C (high levels, i.e., 200 mg/kg of fresh berries), flavonoids, anthocyanidins, catechins, and triterpinoids. The
chemical constituents responsible for their taste are the iridoid glycosides. The anthocyanidins and proanthocyanidins
(PAC) are tannins (stable polyphenols) found only in vaccinium berries and function as a natural plant defense system
against microbes. Common preparations with cranberries include fresh, whole berries, gelatinized products, juices
(usually 10-25% pure juice) and capsules. Pure juice is too acidic (pH, 2.5) and unpalatable, even with sweeteners
.Despite cranberry presentation, it is generally recommended to consume cranberries just prior or two hours after
meals; it is also important to drink lots of water, mainly after preparations from dehydrated juices. Cranberry juice,
predominantly in the form of a juice cocktail drink with approximately 25% cranberry juice, has been the traditional
choice of most women seeking to prevent Urinary Tract Infections (UTIs). American cranberry has a complex and
rich phytochemical composition, particularlyflavan-3-ols, A-type procyanidins (PACs), anthocyanins, benzoic acid,
and ursolic acid. Cranberryflavan-3-ols are present as monomers, oligomers, and polymers). These oligomers and
polymers are also referred to as PACs or condensed tannins and representw85% of the total flavan-3-ols on a weight
basis.
Cranberry is the main source of peonidin among 100 foods commonly consumed in the United States. Quercetin 3-
galactoside is the predominant form, but at least 11 other glycosides are present in lower concentrations. Some of
these, such as quercetin-3-acetylrhamnoside are rare in berries. In the Phenol Explorer database, the flavonol content
of plant foods is usually <3 mg/100 g FW, although bilberry, black-berry, and blueberry contain 3.217 mg/kg.
Cranberry fruit is classed as a functional food due to the naturally high content of compounds, such as polyphenols,
which are believed to have antioxidant and therefore health-promoting properties. Health benefits of cranberry
consumption range from cardio protective effects due to improved cholesterol profiles to aiding digestive health.
Cranberry exists in various forms, including the raw fruit (fresh and dried), cranberry juice and cranberry extract in
capsule/tablet formulations. Cranberry extract could be a potential alternative to antibiotics to treat acute
uncomplicated UTIs. Proanthocyanidin (PAC) with A-type linkages, or their metabolites, is believed to be the active
ingredient in cranberry, preventing Escherichia coli (E. coli) from binding to the bladder uroepithelium and thereby
reducing the ability of E. coli to cause and sustain a UTI. Cranberries have also been found to improve lipid profile,
improve endothelial function, and lower several markers of cardio metabolic risk. Nowadays, growing evidence
suggests an important role of cranberries in maintaining digestive health. In addition to the anti-inflammatory effects,
cranberries may also influence intestinal barrier integrity, which is another essential element of intestinal health.
Cranberry was reported as the main source of peonidin among 100 foods commonly consumed in the United States.
Open Access
Review Article
Journal of Nutrition and Food Processing
Muhammad Arshad Ullah *
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However, in the majority of studies, the total anthocyanin content is re-ported rather than amounts of individual
anthocyanins. This approach may change because the bioavailability and health effects of anthocyanins seem to be
affected by the structures of the aglyconesor the glycosidicmoieties . Quercetin 3-galactoside is the predominant form,
but at least 11 other glycosides are present in lower concentrations. Some of these, such as quercetin-3-
acetylrhamnoside are rare in berries. As shown in the Phenol Explorer database, the flavonol content of plant foods is
usually <3 mg/100 g FW, although bilberry, black-berry, and blueberry contain 3.217 mg/kg.
Key words: anthocyanidins; catechins; triterpinoids; proanthocyanidin and anthocyanin
Introduction
Cranberry is a term derived from the contraction of ‘‘crane berry.’’ This
name is derived from the nickname of the bilberry flower, which, when it
withers, is similar in appearance to the head and neck of the sand crane, a
bird that often feeds on the berries of this plant (Guay, 2009). The
cranberry is part of the Ericaceae family and naturally grows in acidic
swamps full of peat moss in humid forests (Bruyere, 2006). The American
cranberry (Vaccinium macrocarpon) was historically used by North
American Indians to treat UTIs (Guay, 2009). There are other relatives of
the cranberry family (European cranberry V. oxycoccus; lingonberry
V. vitisidaea; blueberry V. myrtillus) that share some of the cranberry’s
basic components, but research evidence for a role in prevention is limited
(Kontiokari et al., 2001 and Jepson and Craig, 2007).
Cranberries are composed of water (88%), organic acids (including
salicylate), fructose, vitamin C (high levels, i.e., 200 mg/kg of fresh
berries), flavonoids, anthocyanidins, catechins, and triterpinoids (Guay,
2009). The chemical constituents responsible for their taste are the iridoid
glycosides. The anthocyanidins and proanthocyanidins (PAC) are tannins
(stable polyphenols) found only in vaccinium berries and function as a
natural plant defense system against microbes (Guay, 2009 and Cimolai
and Cimolai, 2007).
Common preparations with cranberries include fresh, whole berries,
gelatinized products, juices (usually 10-25% pure juice) and capsules
(Guay, 2009; Bruyere, 2006; Kontiokari et al., 2001; Jepson and Craig,
2007; Gupta et al., 2007 and Di Martino et al., 2006). Pure juice is too
acidic (pH, 2.5) and unpalatable, even with sweeteners (Guay,
2009).Despite cranberry presentation, it is generally recommended to
consume cranberries just prior or two hours after meals; it is also
important to drink lots of water, mainly after preparations from
dehydrated juices (Bruyere, 2006). Cranberry juice, predominantly in the
form of a juice cocktail drink with approximately 25% cranberry juice,
has been the traditional choice of most women seeking to prevent Urinary
Tract Infections (UTIs). Cranberries have been tested for their clinical
relevance in many different conditions. They have been evaluated in the
treatment of UTIs but were deemed ineffective (Cimolai and Cimolai,
2007 and Lavigne et al., 2007).
Cranberries were also studied for UTI prophylaxis chiefly in women, but
also in children and men; additionally, they have been studied in
conditions such as neurogenic bladder and pregnancy, (Kontiokari et al.,
2001; Stothers, 2002; Barbosa-Cesnik et al., 2011; McMurdo et al., 2005;
2009; Wing et al., 2008; Lee et al., 2007; McGuinness et al., 2002; Waites
et al., 2004 and Ferrara et al., 2008). Most clinical interest in the use of
cranberries is for cystitis prevention. In the 2008 Cochrane Database of
Systematic Reviews, there were ten randomized trials regarding UTI
prevention on a total of 1,049 patients. They concluded that there is some
evidence that cranberry juice may decrease the number of symptomatic
UTIs over a 12 month period, particularly, and only, for women with
recurrent UTIs (Jepson and Craig, 2008).Whereas berries are noted
simply as good sources of potassium or fiber, recent research suggests
that berry fruits are a rich source of numerous phytochemicals with a
broad array of bioactivity and an impact on human health (Paredes-López
et al., 2010; Côté et al., 2010; Basu and Lyons, 2012; Wang et al., 2012
and Kaspar and Khoo, 2013).
The American cranberry (Vaccinium macrocarpon) is a particularly rich
source of (poly)phenols, which have been associated in vitro with
antibacterial, antiviral, antimu-tagenic, anticarcinogenic,
antitumorigenic, antiangiogenic, anti-inflammatory, and antioxidant
properties (Côté et al., 2010; McKay and Blumberg, 2007 and Del Rio et
al., 2013). In vivo, animal models reveal that cranberry extracts can
reduce C-reactive protein (CRP) and proinflammatory interleu-kins and
increase NO synthesis (Kim et al., 2011); decrease angiotensin-
converting enzyme, angiotensin II, and angiotensin II type 1 receptor
(Yung et al., 2011); suppress Helicobacter pyloriinfection (Xiao and Shi,
2003); and improve pancreaticb-cell glucose responsiveness and
functionalb-cell mass (Zhu et al., 2011). Some of these actions may un-
derlie the results from clinical studies showing that cranberry products
can lower LDL cholesterol (LDL-C) and total cholesterol (Lee et al.,
2008), increase HDL cholesterol (HDL-C) while lowering the oxidative
modification of LDL-C (Ruel et al., 2006), improve endothelial function
(Dohadwala et al., 2011 and Flammer et al., 2011), lower glycemic
responses (Wilson et al., 2010), elevate plasma antioxidant capacity (Ruel
et al., 2005; Duthie et al., 2006 and Vinson et al., 2008), modulate
ulcerogenic gastric H. pyloricolonization (Gotteland et al., 2008 and
Shmuely et al., 2007), decrease cariogenic Streptococcus mutans and total
bacterial counts in saliva (Weiss et al., 2004), reduce biomarkers of
metabolic syndrome (Basu and Lyons, 2012 and Basu et al., 2011), and
protect against urinary tract infections (UTIs) (Wang et al., 2012 and
Vasileiou et al., 2013).
American cranberry has a complex and rich phytochemical composition,
particularlyflavan-3-ols, A-type procyanidins (PACs), anthocyanins,
benzoic acid, and ursolic acid. Cranberryflavan-3-ols are present as
monomers, oligomers, and polymers) (Pappas and Schaich, 2009). These
oligomers and polymers are also referred to as PACs or condensed tannins
and representw85% of the total flavan-3-ols on a weight basis (White et
al., 2011and Gu et al., 2004).
Cranberry was reported as the main source of peonidin among 100 foods
commonly consumed in the United States (Wu et al., 2006). However, in
the majority of studies, the total anthocyanin content is re-ported rather
than amounts of individual anthocyanins. This approach may change
because the bioavailability and health effects of anthocyanins seem to be
affected by the structures of the aglyconesor the glycosidicmoieties(
Crozier et al., 2010 and Czank et al., 2013).Quercetin 3-galactoside is the
predominant form, but at least 11 other glycosides are present in lower
concentrations (Pappas and Schaich, 2009 and Côté et al., 2008). Some
of these, such as quercetin-3-acetylrhamnoside are rare in berries
(Mikulic-Petkovsek et al., 2012). As shown in the Phenol Explorer
database, the flavonol content of plant foods is usually <3 mg/100 g FW,
although bilberry, black-berry, and blueberry contain 3.217 mg/kg
(Mikulic-Petkovsek et al., 2012 and Harnly et al., 2006).
The other species are blueberry (Vaccinium angustifolia) and bil-berry
(Vaccinium myrtillus). Cranberry typically grows in bogs and is a
member of the same family as blueberry and bilberry. Massachusetts and
Wisconsin are the main areas of present-day commercial production of
cranberry (Nova Scotia Department of Agriculture and Fisheries, 2004).
Cranberry has been found to specifically inhibit hemagglutination of E.
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coli by expression of types (Nova Scotia Department of Agriculture and
Fisheries, 2004) and P adhesion through the component compounds
fructose and proanthocyanidins.In the United States, one of every five
women has been reported to have a lifetime incidence of UTI. Of these
women, 3 percent experience recurrent disease. Eleven million women
receive medication for UTIs annually (Foxman et al., 2000).A recent
Cochrane Database systematic review Jepson et al. (2004) found no
randomized trials assessing the effectiveness of cranberry juice in the
treatment of UTIs and concluded that there is no evidence to support its
use. There is much greater evidence-based information available for the
use of cranberry in UTI prophylaxis.A Cochrane Database systematic
review, Jepson et al. (2004) citing small sample sizes and the poor quality
of available trials, determined that there was no reliable evidence of
effectiveness of cranberry in UTI prophylaxis.
However, since 2001, two good-quality studies have been published. The
first trial18 of 150 women consisted of three arms: (Nova Scotia
Department of Agriculture and Fisheries, 2004) cranberry/lingon berry
juice, pro-biotic supplementation with Lactobacillus GG drink; and no
intervention for 12 months. Findings were a statistically significant 20
percent reduction in absolute risk of infection in women receiving
cranberry (number needed to treat: 5) compared with no effect in the
probiotic-supplementation and no-intervention groups (Kontiokari et al.,
2001).Most recently, a randomized, placebo-controlled trial, a single
experimental study showed that the “high-molecular-weight constituent”
of cranberry juice that inhibits the adherence of E. coli was effective in
reversing and inhibiting the coaggregation of a large portion of dental
plaque bacteria. Cranberry also has been recommended as an adjunctive
treatment for Candida infections (Stothers, 2002). A small study found a
significant rise in urinary oxalate levels, prompting a caution that regular
use of cranberry may increase the risk of kidney stone formation in
patients with a history of oxalate calculi (Terris et al., 2001).
Cranberries have historically been associated with urinary tract health,
particularly among women with rUTIs (Raz et al., 2004; Guay, 2009 and
Pérez-López et al., 2009). Results from several clinical studies have
suggested that cranberries may decrease rUTIs in healthy women (Guay,
2009; Vasileiou et al., 2013; Caljouw et al., 2014; Stapleton et al., 2012
and Takahashi et al., 2013). In addition, in vitro and ex vivo research has
suggested that cranberry-derived compounds such as A-type
proanthocyanidins and other polyphenols may interfere with adhesion of
bacteria (including multidrug-resistant Escherichia coli) to epithelial cells
of the urinary tract, attenuate the development of uropathogen reservoirs
(i.e., in the gastrointestinal tract and intracellular pods within the
urothelium), and sup-press inflammatory cascades (Vasileiou et al., 2013;
Gupta et al., 2012 and Blumberg et al., 2013).
Specifically, a meta-analysis by Wang and colleagues published in 2012
concluded that “cranberry products were associated with protective
effects against UTIs (RR: 0.62; 95% CI: 0.49, 0.80), particularly for
women with Recurring Urinary Tract Infections (rUTIs) (RR: 0.53; 95%
CI: 0.33, 0.83)” (Wang et al., 2012). In contrast, a meta-analysis by the
Cochrane Collaboration, also published in 2012, concluded that
“.cranberry juice is less effective than previously indicated. Cranberry
juice cannot currently be recommended for the prevention of UTIs”
(Jepson et al., 2012). It is interesting that the Cochrane analysis was an
up-date of a 2008 report that resulted in a conclusion similar to that
derived by Wang et al., indicating a shift in the conclusions from this
group (Jepson et al., 2008 and 2012).In theory, meta-analysis of results
from randomized clinical trials examines the consistency of data across
studies and is considered to be the strongest level of evidence that guides
relevant practice decisions (Melnyk, 2004).
Cranberry fruit (Vaccinium macrocarpon) grows on evergreen shrubs that
are native to North America (Polashock et al., 2014). Cranberry fruit is
classed as a functional food due to the naturally high content of
compounds, such as polyphenols, which are believed to have antioxidant
and therefore health-promoting properties (Szajdek and Borowska, 2008).
The reported health benefits of cranberry consumption range from cardio
protective effects due to improved cholesterol profiles (Ruel et al., 2006)
to aiding digestive health (Pappas et al., 2009). Cranberry exists in various
forms, including the raw fruit (fresh and dried), cranberry juice and
cranberry extract in capsule/tablet formulations (Bodet et al., 2008).
Cranberry extract could be a potential alternative to antibiotics to treat
acute uncomplicated UTIs. Proanthocyanidin (PAC) with A-type
linkages, or their metabolites, is believed to be the active ingredient in
cranberry, preventing Escherichia coli (E. coli) from binding to the
bladder uroepithelium (Howell et al., 2005) and thereby reducing the
ability of E. coli to cause and sustain a UTI. Systematic reviews assessing
the use of cranberry in the management of recurrent UTIs provide mixed
evidence for benefit (Wang et al., 2012 and Luís et al., 2017). A 2012
Cochrane review of 24 trials (n = 4473) of men, women and children
found that cranberry did not significantly reduce recurrent UTI compared
with placebo, advice to increase water intake or no treatment. A subgroup
analysis of women with recurrent UTI found that cranberry consumption
resulted in a non-significant reduction in recurrent UTIs (Jepson et al.,
2012). Whilst many studies have evaluated the effectiveness of cranberry
extract in reducing recurrent UTI, few have assessed effects on symptoms
of acute UTIs (Vicariotto, 2014).Cranberries for the prevention of UTIs
in susceptible populations are examined in another review by the same
authors (Jepson and Craig, 2008).
Cranberries are among a few foods that contain A-type
proanthocyanidins. Unlike B-type proanthocyanidins, A-type
proanthocyanidins have an additional ether interflavan bond between
C2→O→C7 (Prior and Gu, 2005).It was suggested that A-type
proanthocyanidins have greater bioactivity compared to B-type (Howell
et al., 2005).Two recent studies suggested that cranberry oligosaccharides
might also play a role in preventing UTIs because xyloglucan
oligosaccharides were found to be a new cranberry bioactive component
with E. coli anti-adhesion] activity (Hotchkiss et al., 2015 and Sun et al.,
2015).
Cranberries have also been found to improve lipid profile, improve
endothelial function, and lower several markers of cardio metabolic risk
(Paquette et al., 2017; Lee et al., 2008 and Novotny et al., 2015).
Nowadays, growing evidence suggests an important role of cranberries in
maintaining digestive health (Anhe et al., 2015 and Denis et al.,
2015).Two 250 mL bottles of cranberry juice daily for 90 days was found
to suppress H. Pylori infection in the stomach of susceptible population
(Zhang et al., 2005). In addition to the anti-inflammatory effects,
cranberries may also influence intestinal barrier integrity, which is
another essential element of intestinal health (Contreras et al., 2015 and
Pierre et al., 2014).
In the early 2000s, Kontiokari et al. (2001) and Stothers et al. (2002)
investigated the effects of cranberry juice or tablets, respectively, on UTI
prevention. The subjects were healthy, sexually active women, aged 21
72 years, with a history of UTI. Both studies showed a significantly
decreased number of patients experiencing at least one episode of UTI per
year. In a very recent randomized, double-blind, placebo-controlled,
multicenter clinical trial, 28373healthywomen with a recent UTI history
were recruited to consume a 240 mL low-calorie cranberry juice cocktail
daily for 24 weeks. Cranberry juice consumption significantly reduced the
number of UTIs by 39%.
Urinary tract infection is a common bacterial infection in children (Habib,
2012). One serving of 50 mL cranberry juice was given to the children to
drink once per day for 6 months (Ferrara et al., 2009). This trial had a
relatively large sample size (n=84) and low dropout rate, 3.5% in the
cranberry group versus 6.8% in the control group. Cranberry juice, with
or without proanthocyanidins, was randomly assigned to 40 children for
one year (Afshar et al., 2012). A 65% reduction in the risk of UTIs was
obtained during a 12-month follow up. The compliance level was 70% for
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both groups. Both studies suggested that cranberry juice was effective in
preventing the recurrence of pediatric UTI. Salo et al. (2012) conducted a
double-blinded randomized placebo-controlled trial in 2012.
A 2008 Cochrane review, (Jepson and Craig, 2008) which included five
cross-over and five parallel designed studies, reported that cranberry
products significantly reduced the incidence of UTIs at 12 months
compared to the placebo/control group. Cranberry-containing products
were found to be associated with preventative effects on recurrent UTIs
in another systematic review of 13 randomized controlled trials (Wang et
al., 2012).The most recent meta-analysis and trial sequential analysis
evaluated 28 clinical trials and concluded that the use of cranberry
products significantly reduced the incidence of UTIs (Luis et al., 2017).
However, meta-analysis in the 2012 Cochrane review36concluded that
cranberry products did not significantly reduce the occurrence of
symptomatic UTI overall compared to placebo, water, or no treatment.
This review had substantial heterogeneity in the results.
Several factors contribute to the conflicting results obtained from clinical
trials. The major factors are low compliance due to the as tringency and
bitterness of cranberry juice, high withdrawal rate, inconsistency of
dosage, and lack of standardization of cranberry content in testing
products. Cranberry capsules were used to overcome the undesired taste
of cranberry juice. However, in two trials using cranberry capsules, the
withdrawal rates were more than 40%, partly due to the side effects
(Linsenmeyer et al., 2004 and Waites et al., 2004). Quite a few trials were
not randomized, double blind, or placebo controlled, or had short duration
time (less than 6 months). In addition, the optimum dosage and
formulation were not established in previous studies (Guay, 2004).
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Polyphenols are common constituents of foods plant origin and also major antioxidants in our diet. The main dietary sources of polyphenols are fruits and beverages. Fruits like cranberries, apples, grapes, pears, cherries and various berries contain up to 200—300 mg polyphenols per 100 g fresh weight. Due to its rich content of polyphenols, specifically flavonoids, the cranberry is linked to different bioactivities, including inhibition of bacterial adhesion, bacteriostatic, antiinflammatory activities and modulation of signal transduction, which may lead to improved urinary tract, cardiovascular, oral and gastrointestinal health. The beautiful, rich red colour of the berry and associated health properties have increased the popularity of this small berry and its products for use as both an ingredient and as a functional food.
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Cardiometabolic risk is the risk of cardiovascular disease (CVD), diabetes, or stroke, which are leading causes of mortality and morbidity worldwide. The objective of this study was to determine the potential of low-calorie cranberry juice (LCCJ) to lower cardiometabolic risk. A double-blind, placebo-controlled, parallel-arm study was conducted with controlled diets. Thirty women and 26 men (mean baseline characteristics: 50 y; weight, 79 kg; body mass index, 28 kg/m(2)) completed an 8-wk intervention with LCCJ or a flavor/color/energy-matched placebo beverage. Twice daily volunteers consumed 240 mL of LCCJ or the placebo beverage, containing 173 or 62 mg of phenolic compounds and 6.5 or 7.5 g of total sugar per a 240-mL serving, respectively. Fasting serum triglycerides (TGs) were lower after consuming LCCJ and demonstrated a treatment × baseline interaction such that the participants with higher baseline TG concentrations were more likely to experience a larger treatment effect (1.15 ± 0.04 mmol/L vs. 1.25 ± 0.04 mmol/L, respectively; P = 0.027). Serum C-reactive protein (CRP) was lower for individuals consuming LCCJ than for individuals consuming the placebo beverage [ln transformed values of 0.522 ± 0.115 ln(mg/L) vs. 0.997 ± 0.120 ln(mg/L), P = 0.0054, respectively, and equivalent to 1.69 mg/L vs. 2.71 mg/L back-transformed]. LCCJ lowered diastolic blood pressure (BP) compared with the placebo beverage (69.2 ± 0.8 mm Hg for LCCJ vs. 71.6 ± 0.8 mm Hg for placebo; P = 0.048). Fasting plasma glucose was lower (P = 0.03) in the LCCJ group (5.32 ± 0.03 mmol/L) than in the placebo group (5.42 ± 0.03 mmol/L), and LCCJ had a beneficial effect on homeostasis model assessment of insulin resistance for participants with high baseline values (P = 0.035). LCCJ can improve several risk factors of CVD in adults, including TGs, CRP, glucose, insulin resistance, and diastolic BP. This trial was registered at clinicaltrials.gov as NCT01295684. © 2015 American Society for Nutrition.
Article
An increased permeability of the intestinal barrier is proposed as a major event in the pathophysiology of inflammatory bowel diseases (IBD). Tumor necrosis alpha (TNFα) plays a central role in IBD pathogenesis, in part promoting tight function (TJ) barrier dysfunction. Food extracts enriched in (-)-epicatechin (EC) prevent the development or improve the progression of IBD in animal models. This study investigated the capacity of EC to inhibit TNFα-induced permeabilization of Caco-2 cell monolayers, characterizing the underlying mechanisms. Caco-2 cells differentiated into intestinal epithelial cells were incubated in the absence/presence of TNFα, with or without the addition of 0.5-5 μM EC. TNFα triggered cell monolayer permeabilization, decreasing transepithelial electrical resistance (TEER) and increasing the paracellular transport of fluorescein sulfonic acid. The permeabilizing effects of TNFα were not due to Caco-2 cell apoptosis as evaluated by DNA fragmentation, caspase 3 and 9 activation, and cell morphology. EC prevented TNFα-triggred Caco-2 monolayer permeabilization and acted inhibiting the associated: i- NADPH oxidase (NOX)-mediated increased oxidant production, ii- NF-κB (IκBα phosphorylation, p50 and RelA nuclear transport, and nuclear NF-κB-DNA binding) and ERK1/2 activation, ii- increased myosin light kinase expression, and decreased TJ protein ZO-1 levels. In summary, EC prevented TNFα-mediated Caco-2 cell barrier permeabilization in part through the inhibition of NOX/NF-κB activation and downstream TJ disruption. Diets rich in EC could contribute to ameliorate IBD-associated increased intestinal permeability. Copyright © 2015 Elsevier Inc. All rights reserved.
Article
Background: Urinary tract infections (UTIs) are the most common bacterial infection in women. Most UTIs are acute uncomplicated cystitis caused by Escherichia coli (86%). This study was undertaken to assess the effectiveness of an association of a cranberry dry extract, D-mannose, a gelling complex composed of the exopolysaccharides produced by Streptococcus thermophilus ST10 (DSM 25246) and tara gum, as well as the 2 microorganisms Lactobacillus plantarum LP01 (LMG P-21021) and Lactobacillus paracasei LPC09 (DSM 24243) in women affected by acute uncomplicated cystitis. Materials and methods: Thirty-three premenopausal, nonpregnant women diagnosed with acute uncomplicated cystitis were enrolled in a pilot prospective study and completed the treatment protocol. Subjects were instructed to take 2 doses per day during the first month, and then to continue with 1 sachet per day until the sixtieth day. Nitrites and leukocyte esterase on urine dipstick testing were used as indicators of cystitis, with analysis performed at enrollment, after 30 and 60 days, and after 1 month of follow-up. Typical UTI symptoms, namely dysuria, frequent voiding of small volumes, urinary urgency, suprapubic pain, and gross hematuria were scored 0 to 3 and evaluated at each visit. Results: Positive results for the presence of nitrites and leukocyte esterase were found in 14 and 20 subjects after 30 days and in 9 and 14 women after 60 days, respectively (P<0.001). At the end of the follow-up period, positive results for nitrites and leukocyte esterase were recorded in only 4 and 3 of 24 and 19 subjects (16.7%, P=0.103; 15.8%, P=0.325, respectively), with negative results after 60 days. Typical symptoms of cystitis, specifically dysuria, frequent voiding, urgency, and suprapubic pain were significantly improved as well. No significant differences were recorded in the incidence and severity of hematuria at any visit. Conclusion: The long-term ability of an association of cranberry, D-mannose, an innovative gelling complex, and the 2 microorganisms tested to significantly improve the uncomfortable symptoms reported by women with acute cystitis has been suggested.
Article
Objective The increasing prevalence of obesity and type 2 diabetes (T2D) demonstrates the failure of conventional treatments to curb these diseases. The gut microbiota has been put forward as a key player in the pathophysiology of diet-induced T2D. Importantly, cranberry (Vaccinium macrocarpon Aiton) is associated with a number of beneficial health effects. We aimed to investigate the metabolic impact of a cranberry extract (CE) on high fat/high sucrose (HFHS)-fed mice and to determine whether its consequent antidiabetic effects are related to modulations in the gut microbiota. Design C57BL/6J mice were fed either a chow or a HFHS diet. HFHS-fed mice were gavaged daily either with vehicle (water) or CE (200 mg/kg) for 8 weeks. The composition of the gut microbiota was assessed by analysing 16S rRNA gene sequences with 454 pyrosequencing. Results CE treatment was found to reduce HFHS-induced weight gain and visceral obesity. CE treatment also decreased liver weight and triglyceride accumulation in association with blunted hepatic oxidative stress and inflammation. CE administration improved insulin sensitivity, as revealed by improved insulin tolerance, lower homeostasis model assessment of insulin resistance and decreased glucose-induced hyperinsulinaemia during an oral glucose tolerance test. CE treatment was found to lower intestinal triglyceride content and to alleviate intestinal inflammation and oxidative stress. Interestingly, CE treatment markedly increased the proportion of the mucin-degrading bacterium Akkermansia in our metagenomic samples. Conclusions CE exerts beneficial metabolic effects through improving HFHS diet-induced features of the metabolic syndrome, which is associated with a proportional increase in Akkermansia spp. population.