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Oliero M, Alaoui AA, McCartney C, Santos MM. Colorectal cancer and inulin supplementation: the good, the bad, and the unhelpful. Gastroenterol Rep (Oxf) 2024; 12:goae058. [PMID: 38984069 PMCID: PMC11231048 DOI: 10.1093/gastro/goae058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 03/15/2024] [Accepted: 05/20/2024] [Indexed: 07/11/2024] Open
Abstract
The prebiotic inulin has been vaunted for its potential to reduce the risk of colorectal cancer. Inulin fermentation resulting in the production of short-chain fatty acids, primarily butyrate, has been reported to be associated with properties that are beneficial for gut health and has led to an increased consumption of inulin in the Western population through processed food and over-the-counter dietary supplements. However, in clinical trials, there is limited evidence of the efficacy of inulin in preventing colorectal cancer. Moreover, recent data suggest that improper inulin consumption may even be harmful for gastro-intestinal health under certain circumstances. The main objective of this review is to provide insight into the beneficial and potentially detrimental effects of inulin supplementation in the context of colorectal cancer prevention and enhancement of treatment efficacy.
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Affiliation(s)
- Manon Oliero
- Nutrition and Microbiome Laboratory, Institut du cancer de Montréal, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Ahmed Amine Alaoui
- Nutrition and Microbiome Laboratory, Institut du cancer de Montréal, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
- Department of Medicine, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Claire McCartney
- Nutrition and Microbiome Laboratory, Institut du cancer de Montréal, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
| | - Manuela M Santos
- Nutrition and Microbiome Laboratory, Institut du cancer de Montréal, Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada
- Department of Medicine, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada
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Seesaha PK, Chen X, Wu X, Xu H, Li C, Jheengut Y, Zhao F, Liu L, Zhang D. The interplay between dietary factors, gut microbiome and colorectal cancer: a new era of colorectal cancer prevention. Future Oncol 2020; 16:293-306. [PMID: 32067473 DOI: 10.2217/fon-2019-0552] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Colorectal cancer is the third most common cancer in the world and its incidence is on the rise. Dietary intervention has emerged as an attractive strategy to curtail its occurrence and progression. Diet is known to influence the gut microbiome, as dietary factors and gut bacteria can act in concert to cause or protect from colorectal cancer. Several studies have presented evidence for such interactions and have pointed out the different ways by which the diet and gut microbiome can be altered to produce beneficial effects. This review article aims to summarize the interrelationship between diet, gut flora and colorectal cancer so that a better preventive approach can be applied.
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Affiliation(s)
- Poshita Kumari Seesaha
- Oncology Department, The First Affiliated Hospital, Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, Jiangsu, PR China
| | - Xiaofeng Chen
- Oncology Department, The First Affiliated Hospital, Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, Jiangsu, PR China
| | - Xiaofeng Wu
- Hepatobiliary Center, The First Affiliated Hospital, Nanjing Medical University, Jiangsu, PR China
| | - Hongxia Xu
- Department of Nutrition, Third Military Medical University Daping Hospital & Research Institute of Surgery, Chongqing 400042, Sichuan, PR China
| | - Changxian Li
- Hepatobiliary Center, The First Affiliated Hospital, Nanjing Medical University, Jiangsu, PR China
| | - Yogesh Jheengut
- Oncology Department, The First Affiliated Hospital, Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, Jiangsu, PR China
| | - Fengjiao Zhao
- Oncology Department, The First Affiliated Hospital, Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, Jiangsu, PR China
| | - Li Liu
- School of Public Health, Guizhou Medical University, Guiyang, PR China
| | - Diancai Zhang
- Department of General Surgery, The First Affiliated Hospital, Nanjing Medical University, 300 Guangzhou Road, Nanjing 210029, Jiangsu, PR China
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Davani-Davari D, Negahdaripour M, Karimzadeh I, Seifan M, Mohkam M, Masoumi SJ, Berenjian A, Ghasemi Y. Prebiotics: Definition, Types, Sources, Mechanisms, and Clinical Applications. Foods 2019; 8:E92. [PMID: 30857316 PMCID: PMC6463098 DOI: 10.3390/foods8030092] [Citation(s) in RCA: 554] [Impact Index Per Article: 110.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 12/20/2022] Open
Abstract
Prebiotics are a group of nutrients that are degraded by gut microbiota. Their relationship with human overall health has been an area of increasing interest in recent years. They can feed the intestinal microbiota, and their degradation products are short-chain fatty acids that are released into blood circulation, consequently, affecting not only the gastrointestinal tracts but also other distant organs. Fructo-oligosaccharides and galacto-oligosaccharides are the two important groups of prebiotics with beneficial effects on human health. Since low quantities of fructo-oligosaccharides and galacto-oligosaccharides naturally exist in foods, scientists are attempting to produce prebiotics on an industrial scale. Considering the health benefits of prebiotics and their safety, as well as their production and storage advantages compared to probiotics, they seem to be fascinating candidates for promoting human health condition as a replacement or in association with probiotics. This review discusses different aspects of prebiotics, including their crucial role in human well-being.
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Affiliation(s)
- Dorna Davani-Davari
- Pharmaceutical Biotechnology Incubator, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
| | - Manica Negahdaripour
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
| | - Iman Karimzadeh
- Department of Clinical Pharmacy, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
| | - Mostafa Seifan
- Faculty of Science and Engineering, University of Waikato, Hamilton 3216, New Zealand.
| | - Milad Mohkam
- Biotechnology Research Center, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
| | - Seyed Jalil Masoumi
- Nutrition Research Center, Department of Clinical Nutrition, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
| | - Aydin Berenjian
- Faculty of Science and Engineering, University of Waikato, Hamilton 3216, New Zealand.
| | - Younes Ghasemi
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
- Nutrition Research Center, Department of Clinical Nutrition, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
- Department of Medical Biotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz 71348, Iran.
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Pattananandecha T, Sirilun S, Duangjitcharoen Y, Sivamaruthi BS, Suwannalert P, Peerajan S, Chaiyasut C. Hydrolysed inulin alleviates the azoxymethane-induced preneoplastic aberrant crypt foci by altering selected intestinal microbiota in Sprague-Dawley rats. PHARMACEUTICAL BIOLOGY 2016; 54:1596-1605. [PMID: 26794346 DOI: 10.3109/13880209.2015.1110597] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Revised: 07/16/2015] [Accepted: 10/10/2015] [Indexed: 06/05/2023]
Abstract
Context Inulin, a non-digestible carbohydrate isolated from Helianthus tuberosus L. (Asteraceae), has been shown to alter the gut beneficial bacteria including Lactobacillus spp. and Bifidobacteria. Inulin also influences the activities of intestinal microbiota that could prevent the colon cancer development. Objective This study determines the effect of hydrolysed inulin with different degrees of polymerisation on alteration of intestinal microbiota and their activities on azoxymethane (AOM)-induced preneoplastic aberrant crypt foci (ACF) in rats. Materials and methods Seventy-two male Sprague-Dawley rats were randomly divided into six groups (three control and three AOM-treated groups) and the animal were fed with either a normal diet or diet containing 10% of long-chain inulin (InuL) or short-chain inulin (InuS), respectively, for 17 weeks. Colon cancer was induced in rats by injecting AOM subcutaneously at the 8th and 9th week of the study period. At the end of the experiment, cecal contents of rats were examined for selected microbiota, organic acids, putrefactive compounds and microbial enzymes. ACF formation was microscopically examined. Results The inulin diets significantly increased the weight and decreased the pH of the caecal content. The rats fed with InuL-supplemented diet showed approximately 2.9- and 6.8-fold increases in the biomass of Lactobacillus spp. and Bifidobacteria, respectively. Naive and AOM-treated rats fed with inulin-supplemented diet showed ∼1.3- and ∼2.2-fold decreases in the biomass of Escherichia coli and Salmonella enterica serovar Typhi, respectively. Inulins significantly decreased the colonic concentration of phenol, p-cresol and indole. Reduction in the activity of microbial enzymes such as β-glucuronidase, azoreductase and nitroreductase were observed in inulin-treated animals. Reduction in the ACF formation has been observed in inulin-treated groups. Discussion and conclusion The present study demonstrates that dietary administration of inulin reduces the formation of preneoplastic lesions in the colon, possibly by altering the microecology and microbial activities on carcinogenesis.
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Affiliation(s)
- Thanawat Pattananandecha
- a Health Product Research and Development Unit , Faculty of Pharmacy, Chiang Mai University , Chiang Mai , Thailand
| | - Sasithorn Sirilun
- a Health Product Research and Development Unit , Faculty of Pharmacy, Chiang Mai University , Chiang Mai , Thailand
| | - Yodsawee Duangjitcharoen
- a Health Product Research and Development Unit , Faculty of Pharmacy, Chiang Mai University , Chiang Mai , Thailand
| | | | - Prasit Suwannalert
- b Department of Pathobiology , Faculty of Science, Mahidol University , Bangkok , Thailand
| | | | - Chaiyavat Chaiyasut
- a Health Product Research and Development Unit , Faculty of Pharmacy, Chiang Mai University , Chiang Mai , Thailand
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Moen B, Henjum K, Måge I, Knutsen SH, Rud I, Hetland RB, Paulsen JE. Effect of Dietary Fibers on Cecal Microbiota and Intestinal Tumorigenesis in Azoxymethane Treated A/J Min/+ Mice. PLoS One 2016; 11:e0155402. [PMID: 27196124 PMCID: PMC4873001 DOI: 10.1371/journal.pone.0155402] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 04/28/2016] [Indexed: 12/23/2022] Open
Abstract
Foods naturally high in dietary fiber are generally considered to protect against development of colorectal cancer (CRC). However, the intrinsic effect of dietary fiber on intestinal carcinogenesis is unclear. We used azoxymethane (AOM) treated A/J Min/+ mice, which developed a significantly higher tumor load in the colon than in the small intestine, to compare the effects of dietary inulin (IN), cellulose (CE) or brewers spent grain (BSG) on intestinal tumorigenesis and cecal microbiota. Each fiber was tested at two dose levels, 5% and 15% (w/w) content of the AIN-93M diet. The microbiota was investigated by next-generation sequencing of the 16S rRNA gene (V4). We found that mice fed IN had approximately 50% lower colonic tumor load than mice fed CE or BSG (p<0.001). Surprisingly, all three types of fiber caused a dose dependent increase of colonic tumor load (p<0.001). The small intestinal tumor load was not affected by the dietary fiber interventions. Mice fed IN had a lower bacterial diversity than mice fed CE or BSG. The Bacteroidetes/Firmicutes ratio was significantly (p = 0.003) different between the three fiber diets with a higher mean value in IN fed mice compared with BSG and CE. We also found a relation between microbiota and the colonic tumor load, where many of the operational taxonomic units (OTUs) related to low tumor load were significantly enriched in mice fed IN. Among the OTUs related to low tumor load were bacteria affiliated with the Bacteroides genus. These results suggest that type of dietary fiber may play a role in the development of CRC, and that the suppressive effect of IN on colonic tumorigenesis is associated with profound changes in the cecal microbiota profile.
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Affiliation(s)
- Birgitte Moen
- Nofima - Norwegian Institute of Food, Fisheries and Aquaculture Research, Ås, Norway
| | - Kristi Henjum
- Department of Pharmacology, Oslo University and Oslo University Hospital, Oslo, Norway
- Department of Food, Water and Cosmetics, Division of Environmental Medicine, Norwegian Institute of Public Health, Oslo, Norway
| | - Ingrid Måge
- Nofima - Norwegian Institute of Food, Fisheries and Aquaculture Research, Ås, Norway
| | - Svein Halvor Knutsen
- Nofima - Norwegian Institute of Food, Fisheries and Aquaculture Research, Ås, Norway
| | - Ida Rud
- Nofima - Norwegian Institute of Food, Fisheries and Aquaculture Research, Ås, Norway
| | - Ragna Bogen Hetland
- Department of Food, Water and Cosmetics, Division of Environmental Medicine, Norwegian Institute of Public Health, Oslo, Norway
| | - Jan Erik Paulsen
- Norwegian University of Life Sciences, Department of Food Safety and Infection Biology, Oslo Norway
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Dávila-Céspedes A, Juárez-Flores BI, Pinos-Rodríguez JM, Aguirre-Rivera JR, Oros-Ovalle AC, Loyola-Martínez E, Andrade-Zaldívar H. Protective Effect of Agave salmiana Fructans in Azoxymethane-Induced Colon Cancer in Wistar Rats. Nat Prod Commun 2014. [DOI: 10.1177/1934578x1400901025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Colon cancer is a world concerning disease; it shows a high mortality rate and may be related to eating habits. Studies using inulin-like fructans, which are produced as energy supplies by several plants, have demonstrated a chemo-protective effect of these fructans in colon cancer. However, agavins a structurally different type of fructans from the Agave genus with demonstrated prebiotic effects, have been poorly studied for their possible protective effects in cancer. The aim of the present study was to evaluate the effect of Agave fructan-rich diets in colon cancer progress using a rat model and “Agave mezcalero potosino” A. salmiana Otto ex Salm Dick, which is widely distributed in Mexico. Results showed a significant decrease (p<0.05) in early lesions of colon cancer (aberrant crypt foci) compared with the control group. These data suggest that fructans from A. salmiana may contribute to a reduction in the risk of colon cancer as well as inulin-like compounds.
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Affiliation(s)
- Antonio Dávila-Céspedes
- Programas Multidisciplinarios de Posgrado en Ciencias Ambientales, Universidad Autónoma de San Luis Potosí
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Vogt L, Meyer D, Pullens G, Faas M, Smelt M, Venema K, Ramasamy U, Schols HA, De Vos P. Immunological Properties of Inulin-Type Fructans. Crit Rev Food Sci Nutr 2014; 55:414-36. [DOI: 10.1080/10408398.2012.656772] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Pericleous M, Mandair D, Caplin ME. Diet and supplements and their impact on colorectal cancer. J Gastrointest Oncol 2013; 4:409-23. [PMID: 24294513 DOI: 10.3978/j.issn.2078-6891.2013.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 01/17/2013] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Colorectal cancer is the third commonest cancer and the third leading cause of cancer death among men and women. It has been proposed that dietary factors are responsible for 70-90% of colorectal cancer and diet optimization may prevent most cases. AIM To evaluate the role of dietary components and supplements in colorectal cancer. METHODS Bibliographical searches were performed in Pubmed for the terms "diet and colorectal cancer", "diet and colon cancer", "diet and rectal cancer", "nutrition and colorectal cancer", "probiotics and colorectal cancer", "prebiotics and colorectal cancer", "alcohol and cancer" and "colorectal cancer epidemiology". RESULTS Consumption of processed or red meat, especially when cooked at high temperatures may be associated with increased risk of colorectal cancer. The evidence for dietary fibre is unclear but foods that contain high amounts of fibre are usually rich in polyphenols which have been shown to alter molecular processes that can encourage colorectal carcinogenesis. Meta-analyses provide evidence on the benefits of circulating, diet-derived and supplemented, vitamin D and Calcium. We also found that diets rich in Folate may prevent colorectal carcinoma. The evidence on dietary micronutrients such as Zinc and Selenium in association with colorectal cancer is not conclusive. It has been suggested that there may be a direct association between alcohol intake and colorectal cancer. In vitro and in vivo studies have highlighted a possible protective role of prebiotics and probiotics. CONCLUSIONS The lack of randomized trials and the presence of confounding factors including smoking, physical activity, obesity and diabetes may often yield inconclusive results. Carefully designed randomized trials are recommended.
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Pascoal GB, Filisetti TM, Alvares EP, Lajolo FM, Menezes EW. Impact of onion (Allium cepa L) fructans fermentation on the cecum of rats and the use of in vitro biomarkers to assess in vivo effects. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.bcdf.2013.02.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Klewicka E, Nowak A, Zduńczyk Z, Juśkiewicz J, Cukrowska B. Protective effect of lactofermented red beetroot juice against aberrant crypt foci formation, genotoxicity of fecal water and oxidative stress induced by 2-amino-1-methyl-6-phenylimidazo[4,5-b] pyridine in rats model. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2012; 34:895-904. [PMID: 22995401 DOI: 10.1016/j.etap.2012.08.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Accepted: 08/23/2012] [Indexed: 06/01/2023]
Abstract
The aim of the study was to investigate the effects of beetroot juice fermented by Lactobacillus brevis 0944 and Lactobacillus paracasei 0920 (FBJ) on carcinogen induction of aberrant crypt foci (ACF) in rat colon. 2-Amino-1-methyl-6-phenylimidazo[4,5-b] pyridine (PhIP) was used as carcinogen, which was administrated intragastrically at a dose of 10 μg/day, every day of the experiment. Additionally, we investigated the cytotoxicity and genotoxicity of fecal water from experimental animals in the Caco-2 cell line, evaluated by MTT test and the comet assay, respectively, as well as by the count of bacteria adhered to colon epithelium assessed by fluorescence in situ hybridization. Oxidative stress in rats was expressed by measuring serum antioxidant status and the level of malondialdehyde in the kidneys and liver. The experimental rats were divided into four groups based on diet type: basal diet, basal diet supplemented with FBJ, basal diet and PhIP treatment, and basal diet supplemented with FBJ and PhIP treatment. FBJ significantly reduced the number of ACF in PhIP-treated rats (from 59 ± 18 to 26 ± 4). Moreover, the number of extensive aberrations (more than 4 crypts in a focus) decreased from 52 ± 18 to 18 ± 4. Fecal water obtained from rats fed with a PhIP-containing diet induced pronounced cytotoxic and genotoxic effects in Caco-2 cells, but FBJ supplementation of the diet abolished these effects. In groups fed dietary PhP and FBJ the latter was found to increase the antioxidant status of serum from 40% to 66% depending on the fraction. Reduced concentration of malondialdehyde was found only in the kidneys of rats fed with PhIP and FBJ. FBJ present in the diet of rats causes a reduction of MDA in the kidneys from 118.7 nmol/g tissue to 100 nmol/g tissue. The presence of FBJ in the diet of rats significantly increased the count of bacteria, including Lactobacillus/Enterococcus and Bacteroides-Prevotella group adhered to colonic epithelium. In conclusion, supplementation of the diet with lactofermented beetroot juice may provide protection against precancerous aberrant crypt formation and reduce the cytotoxic and genotoxic effects of fecal water and improve the oxidative status of the organism.
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Affiliation(s)
- Elżbieta Klewicka
- Institute of Fermentation Technology and Microbiology, Technical University of Lodz, Department of Biotechnology and Food Science, Wolczanska 171/173, 90-924 Lodz, Poland.
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Chemopreventive potential of synergy1 and soybean in reducing azoxymethane-induced aberrant crypt foci in fisher 344 male rats. J Nutr Metab 2011; 2011:983038. [PMID: 21437179 PMCID: PMC3062072 DOI: 10.1155/2011/983038] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2009] [Revised: 06/22/2010] [Accepted: 01/16/2011] [Indexed: 11/18/2022] Open
Abstract
Synergy1, a prebiotic composed of Inulin and Oligofructose (1 : 1). Soybean meal is a natural source of isoflavones. The objective was to investigate the effects of feeding Synergy1 and SM on the incidence of azoxymethane- (AOM-) induced aberrant crypt foci (ACF) in Fisher 344 male rats. Rats (54) were randomly assigned to 9 groups (n = 6). Control group (C) was fed AIN-93G and treatment groups Syn1 and SM at 5% and 10% singly and in combinations. Rats were injected with two s/c injections of AOM at 7 and 8 weeks of age at 16 mg/kg body weight and killed at 17 weeks by CO2 asphyxiation. Colonic ACF enumeration and hepatic enzyme activities were measured. Reductions (%) in total ACF among treatment groups fed combinations were higher (67–77) compared to groups fed singly (52–64). Synergistic mechanisms among phytochemicals may be responsible suggesting protective role in colon carcinogenesis with implications in food product development.
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Klewicka E, Nowak A, Zduńczyk Z, Cukrowska B, Błasiak J. Protective effect of lactofermented beetroot juice against aberrant crypt foci formation and genotoxicity of fecal water in rats. ACTA ACUST UNITED AC 2010; 64:599-604. [PMID: 21185162 DOI: 10.1016/j.etp.2010.12.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 11/02/2010] [Accepted: 12/01/2010] [Indexed: 12/19/2022]
Abstract
The aim of the study was to investigate the effects of beetroot juice fermented by Lactobacillus brevis 0944 and Lactobacillus paracasei 0920 (FBJ) on carcinogen induction of aberrant crypt foci (ACF) in rat colon. N-Nitroso-N-methylurea (MNU) was used as carcinogen, which was administrated intragastrically at a dose of 50 mg/kg on the 23rd and 26th day of the experiment. Additionally, we investigated the cytotoxicity and genotoxicity of fecal water from experimental animals in the Caco 2 cell line, evaluated by MTT/NRU tests and the comet assay, respectively, as well as by the count of bacteria adhered to colon epithelium assessed by fluorescence in situ hybridization and DAPI staining. The experimental rats were divided into four groups based on diet type: basal diet, basal diet supplemented with FBJ, basal diet and MNU treatment, and basal diet supplemented with FBJ and MNU treatment. FBJ significantly reduced the number of ACF in MNU-treated rats (from 55±18 to 21±6). Moreover, the number of extensive aberrations (more than 4 crypts in a focus) decreased from 45±21 to 7±4. Fecal water obtained from rats fed with an MNU-containing diet induced pronounced cytotoxic and genotoxic effects in Caco 2 cells, but FBJ supplementation of the diet abolished these effects. The presence of FBJ in the diet significantly increased the count of bacteria, including Lactobacillus/Enterococcus, adhered to colonic epithelium. In conclusion, supplementation of the diet with lactofermented beetroot juice may provide protection against precancerous aberrant crypt formation and reduce the cytotoxic and genotoxic effects of fecal water.
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Affiliation(s)
- Elżbieta Klewicka
- Institute of Fermentation Technology and Microbiology, Technical University of Lodz, Department of Biotechnology and Food Science, Wolczanska 171/173, 90-924 Lodz, Poland.
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Abstract
The different compartments of the gastrointestinal tract are inhabited by populations of micro-organisms. By far the most important predominant populations are in the colon where a true symbiosis with the host exists that is a key for well-being and health. For such a microbiota, 'normobiosis' characterises a composition of the gut 'ecosystem' in which micro-organisms with potential health benefits predominate in number over potentially harmful ones, in contrast to 'dysbiosis', in which one or a few potentially harmful micro-organisms are dominant, thus creating a disease-prone situation. The present document has been written by a group of both academic and industry experts (in the ILSI Europe Prebiotic Expert Group and Prebiotic Task Force, respectively). It does not aim to propose a new definition of a prebiotic nor to identify which food products are classified as prebiotic but rather to validate and expand the original idea of the prebiotic concept (that can be translated in 'prebiotic effects'), defined as: 'The selective stimulation of growth and/or activity(ies) of one or a limited number of microbial genus(era)/species in the gut microbiota that confer(s) health benefits to the host.' Thanks to the methodological and fundamental research of microbiologists, immense progress has very recently been made in our understanding of the gut microbiota. A large number of human intervention studies have been performed that have demonstrated that dietary consumption of certain food products can result in statistically significant changes in the composition of the gut microbiota in line with the prebiotic concept. Thus the prebiotic effect is now a well-established scientific fact. The more data are accumulating, the more it will be recognised that such changes in the microbiota's composition, especially increase in bifidobacteria, can be regarded as a marker of intestinal health. The review is divided in chapters that cover the major areas of nutrition research where a prebiotic effect has tentatively been investigated for potential health benefits. The prebiotic effect has been shown to associate with modulation of biomarkers and activity(ies) of the immune system. Confirming the studies in adults, it has been demonstrated that, in infant nutrition, the prebiotic effect includes a significant change of gut microbiota composition, especially an increase of faecal concentrations of bifidobacteria. This concomitantly improves stool quality (pH, SCFA, frequency and consistency), reduces the risk of gastroenteritis and infections, improves general well-being and reduces the incidence of allergic symptoms such as atopic eczema. Changes in the gut microbiota composition are classically considered as one of the many factors involved in the pathogenesis of either inflammatory bowel disease or irritable bowel syndrome. The use of particular food products with a prebiotic effect has thus been tested in clinical trials with the objective to improve the clinical activity and well-being of patients with such disorders. Promising beneficial effects have been demonstrated in some preliminary studies, including changes in gut microbiota composition (especially increase in bifidobacteria concentration). Often associated with toxic load and/or miscellaneous risk factors, colon cancer is another pathology for which a possible role of gut microbiota composition has been hypothesised. Numerous experimental studies have reported reduction in incidence of tumours and cancers after feeding specific food products with a prebiotic effect. Some of these studies (including one human trial) have also reported that, in such conditions, gut microbiota composition was modified (especially due to increased concentration of bifidobacteria). Dietary intake of particular food products with a prebiotic effect has been shown, especially in adolescents, but also tentatively in postmenopausal women, to increase Ca absorption as well as bone Ca accretion and bone mineral density. Recent data, both from experimental models and from human studies, support the beneficial effects of particular food products with prebiotic properties on energy homaeostasis, satiety regulation and body weight gain. Together, with data in obese animals and patients, these studies support the hypothesis that gut microbiota composition (especially the number of bifidobacteria) may contribute to modulate metabolic processes associated with syndrome X, especially obesity and diabetes type 2. It is plausible, even though not exclusive, that these effects are linked to the microbiota-induced changes and it is feasible to conclude that their mechanisms fit into the prebiotic effect. However, the role of such changes in these health benefits remains to be definitively proven. As a result of the research activity that followed the publication of the prebiotic concept 15 years ago, it has become clear that products that cause a selective modification in the gut microbiota's composition and/or activity(ies) and thus strengthens normobiosis could either induce beneficial physiological effects in the colon and also in extra-intestinal compartments or contribute towards reducing the risk of dysbiosis and associated intestinal and systemic pathologies.
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Timm DA, Stewart ML, Hospattankar A, Slavin JL. Wheat Dextrin, Psyllium, and Inulin Produce Distinct Fermentation Patterns, Gas Volumes, and Short-Chain Fatty Acid ProfilesIn Vitro. J Med Food 2010; 13:961-6. [DOI: 10.1089/jmf.2009.0135] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Affiliation(s)
- Derek A. Timm
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, Minnesota, New Jersey, USA
| | - Maria L. Stewart
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, Minnesota, New Jersey, USA
| | | | - Joanne L. Slavin
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, Minnesota, New Jersey, USA
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Abstract
Oligosaccharides are attracting increasing interest as prebiotic functional food ingredients. They can be extracted or obtained by enzymatic hydrolysis from a variety of biomass sources or synthesized from simple oligosaccharides by enzymatic transfer reactions. The major prebiotic oligosaccharides on the market are inulin, fructo-oligosaccharides, and galacto-oligosaccharides. They have been evaluated using a range of in vitro and in vivo methods, although there is a need for more large-scale human trials using modern microbiological methods. Prebiotics are being studied for their effects on gut health and well being and specific clinical conditions, including colon cancer, inflammatory bowel disease (IBD), acute infections, and mineral absorption. Developing understanding of the functional ecology of the human gut is influencing current thinking on what a prebiotic might achieve and is providing new targets for prebiotic intervention.
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Affiliation(s)
- R A Rastall
- Department of Food and Nutritional Sciences, University of Reading, Reading RG6 6AP, United Kingdom.
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Dias MC, Vieiralves NFL, Gomes MIFV, Salvadori DMF, Rodrigues MAM, Barbisan LF. Effects of lycopene, synbiotic and their association on early biomarkers of rat colon carcinogenesis. Food Chem Toxicol 2009; 48:772-80. [PMID: 20026158 DOI: 10.1016/j.fct.2009.12.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Revised: 12/02/2009] [Accepted: 12/12/2009] [Indexed: 12/18/2022]
Abstract
This study evaluated whether a synergy exists for the combined treatment with lycopene and synbiotic on early biomarkers of colon carcinogenesis. Male Wistar rats received a diet containing 300 mg/kg of lycopene and/or synbiotic (Bifidobacterium lactisplus oligofructose/inulin) or their combination 2 weeks before and during carcinogen treatment with 1,2-dimethylhydrazine (DMH). Twenty-four hours after the last DMH application, the colons were processed for immunohistochemical analysis of proliferating cell nuclear antigen (PCNA), p53 protein, hematoxylin-eosin staining for apoptosis analysis and genotoxicity of fecal water by comet assay. Eight weeks after the last DMH application, the colons were analyzed for development of classical aberrant crypt foci (ACF) and mucin-negative ACF. Treatment with lycopene, synbiotic or their combination significantly increased apoptosis, reduced the PCNA and p53 labeling indexes and the development of classical ACF and mucin-negative ACF. Furthermore, a lower genotoxicity of fecal water was also detected in the groups treated with the chemopreventive agents. An additive/synergistic effect of the combined treatment with lycopene/synbiotic was observed only for the fecal water genotoxicity and mucin-negative ACF parameters. These results indicate that an additive/synergistic of the combination of chemopreventive agents on the initiation phase of colon carcinogenesis can be detected using selective early biomarkers.
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Affiliation(s)
- Marcos C Dias
- Department of Morphology, UNESP São Paulo State University, Institute of Biosciences, 18618-000 Botucatu, SP, Brazil
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17
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Van Loo J. The specificity of the interaction with intestinal bacterial fermentation by prebiotics determines their physiological efficacy. Nutr Res Rev 2009; 17:89-98. [PMID: 19079918 DOI: 10.1079/nrr200377] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The concept of prebiotic food ingredients is an important recent development in nutrition. The concept has attracted a great deal of attention, and many food ingredients (mainly dietary carbohydrates) have been claimed to be 'prebiotic'. It is emphasised that in order to be called prebiotic, a compound should be: (1) non-digestible; (2) fermentable; (3) fermentable in a selective way. These properties should be demonstrated in human volunteers in at least two independent dietary intervention trials. On the basis of published and unpublished results, it is shown in the present paper that the way in which a prebiotic influences intestinal fermentation is the key to its physiological properties. This statement is illustrated mainly by considering an established group of prebiotics, the beta(2-1) fructans. These linear molecules show a strong discontinuity in physicochemical properties as the chains become longer. The beta(2-1) fructans with a chain length of up to ten monomer units are very soluble and are particularly 'bifidogenic'. Longer chains (ten to sixty-five monomer units) are poorly soluble in water, they have less pronounced bifidogenic properties, and they are fermented more slowly. It was observed that a combination of short-chain and long-chain fructans (Synergy 1) is physiologically (for example, increasing mineral absorption, suppressing carcinogenesis, modulating lipid metabolism, etc) more active than the individual fractions. A possible mechanism is described in the present review. From an in-depth overview of the literature it is confirmed that for prebiotic action, the 'selectivity principle' for intestinal fermentation is determinative for the type and for the efficiency of physiological activity. It is confirmed that prebiotics act through their influence on intestinal fermentation.
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Affiliation(s)
- Jan Van Loo
- ORAFTI, Aandorenstraat 1, B3300 Tienen, Belgium.
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18
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Boateng J, Verghese M, Panala V, Walker L, Shackelfor L. Protective Effects of Rice Bran on Chemically Induced Colon Tumorigenesis may be Due to Synergistic/Additive Properties of Bioactive Components. ACTA ACUST UNITED AC 2009. [DOI: 10.3923/ijcr.2009.153.166] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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19
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Gajula D, Verghese M, Boateng J, Walker L, Shackelfor L, Mentreddy S, Cedric S. Determination of Total Phenolics, Flavonoids and Antioxidant and Chemopreventive
Potential of Basil (Ocimum basilicum L. and Ocimum tenuiflorum
L.). ACTA ACUST UNITED AC 2009. [DOI: 10.3923/ijcr.2009.130.143] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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20
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Femia AP, Salvadori M, Broekaert WF, François IEJA, Delcour JA, Courtin CM, Caderni G. Arabinoxylan-oligosaccharides (AXOS) reduce preneoplastic lesions in the colon of rats treated with 1,2-dimethylhydrazine (DMH). Eur J Nutr 2009; 49:127-32. [DOI: 10.1007/s00394-009-0050-x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2009] [Accepted: 08/05/2009] [Indexed: 02/06/2023]
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21
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Panala V, Verghese M, Boateng J, Field R, Shackelfor L, Walker L. A Comparison of Rice Bran, Corn Oil and Soybean Oil Against Azoxymethane Induced Colon Cancer in a Fisher 344 Rat Model. ACTA ACUST UNITED AC 2008. [DOI: 10.3923/ijcr.2009.25.35] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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22
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Rehman H, Bhm J, Zentek J. Effects of differentially fermentable carbohydrates on the microbial fermentation profile of the gastrointestinal tract of broilers. J Anim Physiol Anim Nutr (Berl) 2008; 92:471-80. [DOI: 10.1111/j.1439-0396.2007.00736.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sung HY, Choi YS. Fructooligosaccharide and soy isoflavone suppress colonic aberrant crypt foci and cyclooxygenase-2 expression in dimethylhydrazine-treated rats. J Med Food 2008; 11:78-85. [PMID: 18361741 DOI: 10.1089/jmf.2007.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This study investigated the inhibitory effects of soy isoflavones and fructooligosaccharide (FOS) on colon carcinogenesis. Sprague-Dawley male rats were injected with 1,2-dimethylhydrazine (DMH) and given experimental diets that contained 0%, 3%, 6%, or 9% FOS with or without soy isoflavones (1,000 mg/kg of diet). After 12 weeks, colonic aberrant crypt foci (ACF) formation, cyclooxygenase-2 (COX-2) expression, and fecal bile acid profiles were determined. The numbers of ACF, the numbers of ACF containing four or more crypts per focus of colonic mucosa, and the levels of COX-2 protein in the colonic epithelial tissues were significantly decreased in a dose-dependent manner in the FOS-fed, DMH-treated rats (P < .001), as compared to the DMH-treated control rats. Soy isoflavones significantly decreased the number of ACF with four or more aberrant crypts per focus (P < .001) and the amount of COX-2 protein (P < .01), independently of the effect of the oligosaccharide. The highest suppression of ACF formation was obtained with soy isoflavones combined with >or=6% FOS. No significant relationship was found between the dosage of FOS or soy isoflavones and the concentration of fecal secondary bile acid. We conclude that the combination of FOS and soy isoflavones inhibits colonic ACF formation and reduces COX-2 expression in DMH-treated rats.
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Affiliation(s)
- Hye-Young Sung
- Department of Food and Nutrition, Daegu University, Gyeongsan, Republic of Korea
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24
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Abstract
Worldwide, the population is aging, with estimates of 1 billion people aged 60 y or over within the next 20 y. With aging comes a reduction in overall health and increased morbidity and mortality due to infectious disease. Mortality due to gastrointestinal infections is up to 400 times higher in the elderly compared with younger adults. Recent studies have shown that the gut microbiota changes in old age, with an increased number of bacterial groups represented in the predominant elderly gut microbiota. This change in species "evenness" coincides with parallel changes in immune function, diet, and lifestyle and may contribute to disease susceptibility and severity in old age. The intestinal microbiota may thus be identified as an important target for improving health through reduced disease risk. Here, the application of prebiotics, especially the inulin-type fructans, and synbiotics (prebiotics combined with efficacious probiotic strains) will be discussed in terms of microbiota modulation and impact on disease risk in the aged population. Recent human intervention studies have confirmed the microbiota modulatory capability of the inulin-type fructans in the elderly and there is some evidence for reduced risk of disease. However, there is a need for more and larger human intervention studies to determine the efficacy of prebiotics in the elderly, particularly studies that take advantage of recent high resolution analytical methodologies like metabonomics, to shed light on possible prebiotic mechanisms of action.
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Affiliation(s)
- Kieran M Tuohy
- Department of Food Biosciences, School of Chemistry, Food Bioscience and Pharmacy, University of Reading, Reading, UK.
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25
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Boateng JA, Verghese M, Walker LT, Shackelford LA, Chawan CB. Inhibitory effects of selected dry beans (Phaseolus spp L) on azoxymethane-induced formation of aberrant crypt foci in Fisher 344 male rats. Nutr Res 2007. [DOI: 10.1016/j.nutres.2007.07.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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26
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Sauer J, Richter KK, Pool-Zobel BL. Products formed during fermentation of the prebiotic inulin with humangut flora enhance expression of biotransformation genes in human primarycolon cells. Br J Nutr 2007; 97:928-37. [PMID: 17381985 DOI: 10.1017/s0007114507666422] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Inulin-type fructans are fermented by gut bacteria to yield SCFA, including butyrate which is trophic for colonocytes and induces glutathioneS-transferases (GST) that detoxify carcinogens. Since little is known on similar effects by complex fermentation samples, we studied related products in non-transformed human colonocytes. Inulin enriched with oligofructose (1 : 1, Synergy1) was fermented with human gut flora. SCFA were quantified and a SCFA mixture was prepared accordingly. Colonocytes were incubated (4–12 h) with the Synergy1 fermentation supernatant (SFS), faeces control, a mixture of the three major SCFA (each 0–15 %, v/v) or butyrate (0–50 mm). Metabolic activity was determined to assess trophic effects and cytotoxicity. Expression of ninety-six genes related to biotransformation was studied using cDNA macroarrays. Results on modulated GST were reassessed with real-time PCR and GST activity was measured. Fermentation of inulin resulted in 2–3-fold increases of SCFA. The samples were non-cytotoxic. SFS increased metabolic activity, pointing to trophic effects. The samples modulated gene expression with different response patterns. Key results were thatGSTM2(2·0-fold) andGSTM5(2·2-fold) were enhanced by SFS, whereas the SCFA mixture reduced expression. The faeces control enhancedGSTA4(2·0-fold), but reducedGSTM2(0·2-fold) andGSTM5(0·2-fold). Real-time qPCR confirmed the induction ofGSTM2andGSTM5by SFS and ofGSTA4andGSTT2by butyrate. Activity of GST was not modulated. High concentrations of fermentation products were well tolerated by primary colonocytes, pointing to trophic effects. The induction of GST by the SFS may protect the cells from carcinogenic compounds.
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Affiliation(s)
- Julia Sauer
- Department of Nutritional Toxicology, Institute for Nutrition, Friedrich-Schiller-University, Dornburger Str. 25, D-07743 Jena, Germany
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27
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Bird AR, Vuaran M, Brown I, Topping DL. Two high-amylose maize starches with different amounts of resistant starch vary in their effects on fermentation, tissue and digesta mass accretion, and bacterial populations in the large bowel of pigs. Br J Nutr 2007; 97:134-44. [PMID: 17217569 DOI: 10.1017/s0007114507250433] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Four groups of young pigs (n 6) were fed a diet containing 50% maize starch as either a highly digestible waxy starch (control; 0% amylose) or one of three resistant starch (RS) diets, namely a high-amylose maize starch (HAMS; 85% amylose), this starch subjected to hydrothermal treatment (HTHAMS; 85% amylose), or a blend of HAMS and HTHAMS included in equal amounts, for 21 d. Food intake and live weight at the end of the study were similar among the four groups. Ileal starch digestibility was lower in pigs fed the three RS diets but was greater for HAMS(88%) than for HTHAMS (70%; P<0.05). Faecal output and large bowel digesta mass, and concentrations and pools of individual and total SCFA were higher (by about two- to threefold; all P<0.05) and digesta pH lower (by about 1 unit, all P<0.001) in pigs fed either HAMS or HTHAMS compared to the controls. These differences in biomarkers were seen along the length of the large bowel. Colon length was 0.5-0.9 m longer (19-35%) in pigs fed the high-RS diets relative to those fed the highly digestible starch diet (P<0.05). Faecal and proximal colonic lactobacilli and bifidobacteria numbers were higher (by 1 and 3 log units; P< 0.05) in pigs fed the HAMS or HTHAMS diets. Although both high-amylose starches promoted fermentation throughout the large bowel, the data suggest that the effects of HTHAMS may be more pronounced in the distal region compared to those of HAMS.
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Affiliation(s)
- Anthony R Bird
- CSIRO Health Sciences and Nutrition, Adelaide, SA, Australia.
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28
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Rafter J, Bennett M, Caderni G, Clune Y, Hughes R, Karlsson PC, Klinder A, O'Riordan M, O'Sullivan GC, Pool-Zobel B, Rechkemmer G, Roller M, Rowland I, Salvadori M, Thijs H, Van Loo J, Watzl B, Collins JK. Dietary synbiotics reduce cancer risk factors in polypectomized and colon cancer patients. Am J Clin Nutr 2007; 85:488-96. [PMID: 17284748 DOI: 10.1093/ajcn/85.2.488] [Citation(s) in RCA: 295] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Animal studies suggest that prebiotics and probiotics exert protective effects against tumor development in the colon, but human data supporting this suggestion are weak. OBJECTIVE The objective was to verify whether the prebiotic concept (selective interaction with colonic flora of nondigested carbohydrates) as induced by a synbiotic preparation-oligofructose-enriched inulin (SYN1) + Lactobacillus rhamnosus GG (LGG) and Bifidobacterium lactis Bb12 (BB12)-is able to reduce the risk of colon cancer in humans. DESIGN The 12-wk randomized, double-blind, placebo-controlled trial of a synbiotic food composed of the prebiotic SYN1 and probiotics LGG and BB12 was conducted in 37 colon cancer patients and 43 polypectomized patients. Fecal and blood samples were obtained before, during, and after the intervention, and colorectal biopsy samples were obtained before and after the intervention. The effect of synbiotic consumption on a battery of intermediate bio-markers for colon cancer was examined. RESULTS Synbiotic intervention resulted in significant changes in fecal flora: Bifidobacterium and Lactobacillus increased and Clostridium perfringens decreased. The intervention significantly reduced colorectal proliferation and the capacity of fecal water to induce necrosis in colonic cells and improve epithelial barrier function in polypectomized patients. Genotoxicity assays of colonic biopsy samples indicated a decreased exposure to genotoxins in polypectomized patients at the end of the intervention period. Synbiotic consumption prevented an increased secretion of interleukin 2 by peripheral blood mononuclear cells in the polypectomized patients and increased the production of interferon gamma in the cancer patients. CONCLUSIONS Several colorectal cancer biomarkers can be altered favorably by synbiotic intervention.
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Affiliation(s)
- Joseph Rafter
- Department of Medical Nutrition, Karolinska Institutet, Huddinge, Sweden, University College Cork, Cork, Ireland
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31
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Verghese M, Walker LT, Shackelford L, Chawan CB. Inhibitory effects of nondigestible carbohydrates of different chain lengths on azoxymethane-induced aberrant crypt foci in Fisher 344 rats. Nutr Res 2005. [DOI: 10.1016/j.nutres.2005.09.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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32
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Pool-Zobel BL. Inulin-type fructans and reduction in colon cancer risk: review of experimental and human data. Br J Nutr 2005; 93 Suppl 1:S73-90. [PMID: 15877900 DOI: 10.1079/bjn20041349] [Citation(s) in RCA: 138] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Inulin-type fructans (beta(2,1)fructans) extracted from chicory roots (Cichorium intybus) are prebiotic food ingredients, which in the gut lumen are fermented to lactic acid and SCFA. Research in experimental animal models revealed that inulin-type fructans have anticarcinogenic properties. A number of studies report the effects of inulin-type fructans on chemically induced pre-neoplastic lesions (ACF) or tumours in the colon of rats and mice. In twelve studies, there were twenty-nine individual treatment groups of which twenty-four measured aberrant crypt foci (ACF) and five measured tumours. There was a significant reduction of ACF in twenty-one of the twenty-four treatment groups and of tumour incidence in five of the five treatment groups. Higher beneficial effects were achieved by synbiotics (mixtures of probiotics and prebiotics), long-chain inulin-type fructans compared to short-chain derivatives, and feeding high-fat Western style diets. Inulin-type fructans reduced tumour incidence in APC(Min) mice in two of four studies and reduced growth and metastasising properties of implanted tumour cells in mice (four studies). The effects have been reported to be associated with gut flora-mediated fermentation and production of butyrate. In human cells, inulin-derived fermentation products inhibited cell growth, modulated differentiation and reduced metastasis activities. In conclusion, evidence has been accumulated that shows that inulin-type fructans and corresponding fermentation products reduced the risks for colon cancer. The involved mechanisms included the reduction of exposure to risk factors and suppression of tumour cell survival. Thus, this specific type of dietary fibre exerted both blocking agent and suppressing agent types of chemopreventive activities.
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Affiliation(s)
- Beatrice L Pool-Zobel
- Department of Nutritional Toxicology, Institute for Nutritional Sciences, Friedrich-Schiller-University Jena, Germany.
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33
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Le Leu RK, Brown IL, Hu Y, Bird AR, Jackson M, Esterman A, Young GP. A synbiotic combination of resistant starch and Bifidobacterium lactis facilitates apoptotic deletion of carcinogen-damaged cells in rat colon. J Nutr 2005; 135:996-1001. [PMID: 15867271 DOI: 10.1093/jn/135.5.996] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Recent reports suggest that combinations of prebiotics and probiotics may be protective against colorectal cancer. We examined in rats the effects of probiotic bacteria, resistant starch (RS), and their interaction on luminal and epithelial events of relevance to the development of colorectal cancer. Lyophilized cultures (1 x 10(10) cfu/g) of Lactobacillus acidophilus and/or Bifidobacterium lactis were added at a concentration of 1% by weight to a semipurified diet containing either low-RS (no supplemented RS) or moderate-RS (10% Hi-maize) and fed to male Sprague-Dawley rats for 4 wk. Experimental end-points included cecal bacterial enumeration, fecal and cecal pH, SCFA levels, cell proliferation, and the acute apoptotic response to a genotoxic carcinogen (AARGC; measured 6 h after a single azoxymethane injection). A significant interaction between dietary RS and supplemental bacteria was observed for the AARGC in the colon and fecal pH (P < 0.01). Rats fed the moderate-RS diet in combination with B. lactis had a significantly greater AARGC in the colon than those fed that diet without B. lactis. Fecal pH was elevated in the moderate-RS fed rats supplemented with bacteria. The moderate-RS diet increased cell proliferation and crypt column height (P < 0.001) compared with the low-RS diet. SCFA levels and numbers of bifidobacteria and lactobacilli species were also increased (P < 0.001) by the moderate-RS diet, whereas pH levels and total coliforms were lowered (P < 0.001). The synbiotic combination of RS and B. lactis significantly facilitated the apoptotic response to a genotoxic carcinogen in the distal colon of rats. It appears likely that ingested RS acts as a metabolic substrate, thus creating the right conditions for B. lactis to exert its proapoptotic action. Because the synbiotic combination of these agents facilitates the apoptotic response to DNA damage by a cancer initiator in the colon of rats, it warrants further study for its capacity to protect against colorectal cancer.
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Affiliation(s)
- Richard K Le Leu
- Department of Medicine, Flinders University of South Australia, Bedford Park, South Australia 5042.
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Gibson PR, Shepherd SJ. Personal view: food for thought--western lifestyle and susceptibility to Crohn's disease. The FODMAP hypothesis. Aliment Pharmacol Ther 2005; 21:1399-409. [PMID: 15948806 DOI: 10.1111/j.1365-2036.2005.02506.x] [Citation(s) in RCA: 219] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Susceptibility to the development of Crohn's disease involves a combination of genetic and environmental factors. The association of Crohn's disease with westernization has implicated lifestyle factors in pathogenesis. While diet is a likely candidate, evidence for specific changes in dietary habits and/or intake has been lacking. A new hypothesis is proposed, by which excessive delivery of highly fermentable but poorly absorbed short-chain carbohydrates and polyols (designated FODMAPs--Fermentable Oligo-, Di- and Mono-saccharides And Polyols) to the distal small intestinal and colonic lumen is a dietary factor underlying susceptibility to Crohn's disease. The subsequent rapid fermentation of FODMAPs in the distal small and proximal large intestine induces conditions in the bowel that lead to increased intestinal permeability, a predisposing factor to the development of Crohn's disease. Evidence supporting this hypothesis includes the increasing intake of FODMAPs in western societies, the association of increased intake of sugars in the development of Crohn's disease, and the previously documented effects of the ingestion of excessive FODMAPs on the bowel. This hypothesis provides potential for the design of preventive strategies and raises concern about current enthusiasm for putative health-promoting effects of FODMAPs. One of the greatest challenges in defining the pathogenesis of Crohn's disease is to identify predisposing environmental factors. Such an achievement might lead to the development of preventive strategies for, and the definition of, possible target for changing the natural history of this serious disease. The present paper describes a new hypothesis for one such environmental factor.
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Affiliation(s)
- P R Gibson
- Department of Gastroenterology, Box Hill Hospital, Victoria, Australia.
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Kwon Y, Malik M, Magnuson BA. Inhibition of colonic aberrant crypt foci by curcumin in rats is affected by age. Nutr Cancer 2004; 48:37-43. [PMID: 15203376 DOI: 10.1207/s15327914nc4801_6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Curcumin has antioxidative, anti-inflammatory, and chemopreventive activities. To determine whether aging affects the inhibition of colon carcinogenesis by curcumin, young (6 wk), mature (12 mo), and old (22 mo) F344 male rats were fed either AIN-93 containing 0.6% curcumin or AIN-93 control diet. Aberrant crypt foci (ACF) were induced with two weekly s.c. injections of azoxymethane. After an additional 3 mo on the diets, the number, multiplicity, and distribution of ACF were evaluated. Addition of curcumin to the diet reduced the number of ACF by 49% in young rats and by 55% in old rats (P < 0.05). However, interestingly, no reduction of ACF was found in mature rats fed curcumin. Inhibition of large ACF was also affected by age, with the greatest reduction of large ACF occurring in old rats. However, animal age did not significantly alter the effect of dietary curcumin on reduction of cyclooxygenase-2 mRNA expression in the liver or reduction of serum total cholesterol levels. These results indicate that age may play a significant role in the efficacy of chemoprevention of colon cancer by curcumin.
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Affiliation(s)
- Youngjoo Kwon
- Department of Nutrition and Food Science, University of Maryland, College Park 20742, USA
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Abstract
BACKGROUND The prebiotics concept, which was launched in 1995, concerns nondigested and selectively fermented carbohydrate food ingredients. It was thought that their effect in the colon could reduce risk for disease. The prebiotic concept is revisited and possible mechanisms are proposed. The physiologic consequences of prebiotic consumption are evaluated in terms of potential to reduce risk for disease. This is a compilation of several research papers, each of which complied with the World Medical Association Declaration of Helsinki. METHODS For human dietary intervention trials, the aim was to perform double-blind, placebo-controlled, cross-over studies. A parallel design was used only for long-term studies. Most research has been done with beta(2-1) fructans, so they are used as an example of prebiotics here. RESULTS The results are relevant to the fields of gut function, lipid metabolism, mineral absorption, bone formation, immunology, and cancer. CONCLUSION It is observed that modification of intestinal flora by inherently selectively fermented prebiotics is central in determining their nutritional properties. They interact positively through the large intestinal surface with various physiologic processes and are thought to improve health status by reducing risk for disease (markers).
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