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Güven Gülhan Ü, Nikerel E, Çakır T, Erdoğan Sevilgen F, Durmuş S. Species-level identification of enterotype-specific microbial markers for colorectal cancer and adenoma. Mol Omics 2024. [PMID: 38780313 DOI: 10.1039/d4mo00016a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
Enterotypes have been shown to be an important factor for population stratification based on gut microbiota composition, leading to a better understanding of human health and disease states. Classifications based on compositional patterns will have implications for personalized microbiota-based solutions. There have been limited enterotype based studies on colorectal adenoma and cancer. Here, an enterotype-based meta-analysis of fecal shotgun metagenomic studies was performed, including 1579 samples of healthy controls (CTR), colorectal adenoma (ADN) and colorectal cancer (CRC) in total. Gut microbiota of healthy people were clustered into three enterotypes (Ruminococcus-, Bacteroides- and Prevotella-dominated enterotypes). Reference-based enterotype assignments were performed for CRC and ADN samples, using the supervised machine learning algorithm, K-nearest neighbors. Differential abundance analyses and random forest classification were conducted on each enterotype between healthy controls and CRC-ADN groups, revealing novel enterotype-specific microbial markers for non-invasive CRC screening strategies. Furthermore, we identified microbial species unique to each enterotype that play a role in the production of secondary bile acids and short-chain fatty acids, unveiling the correlation between cancer-associated gut microbes and dietary patterns. The enterotype-based approach in this study is promising in elucidating the mechanisms of differential gut microbiome profiles, thereby improving the efficacy of personalized microbiota-based solutions.
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Affiliation(s)
- Ünzile Güven Gülhan
- Department of Bioengineering, Gebze Technical University, Gebze, TR 41400, Turkey.
| | - Emrah Nikerel
- Department of Genetics and Bioengineering, Yeditepe University, Istanbul, TR 34755, Turkey
| | - Tunahan Çakır
- Department of Bioengineering, Gebze Technical University, Gebze, TR 41400, Turkey.
- PhiTech Bioinformatics, Gebze, TR 41470, Turkey
| | - Fatih Erdoğan Sevilgen
- The Institute for Data Science & Artificial Intelligence, Boğaziçi University, Istanbul, TR 34342, Turkey
- PhiTech Bioinformatics, Gebze, TR 41470, Turkey
| | - Saliha Durmuş
- Department of Bioengineering, Gebze Technical University, Gebze, TR 41400, Turkey.
- PhiTech Bioinformatics, Gebze, TR 41470, Turkey
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2
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Welham Z, Li J, Engel AF, Molloy MP. Mucosal Microbiome in Patients with Early Bowel Polyps: Inferences from Short-Read and Long-Read 16S rRNA Sequencing. Cancers (Basel) 2023; 15:5045. [PMID: 37894412 PMCID: PMC10605900 DOI: 10.3390/cancers15205045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/13/2023] [Accepted: 10/14/2023] [Indexed: 10/29/2023] Open
Abstract
Numerous studies have correlated dysbiosis in stool microbiota with colorectal cancer (CRC); however, fewer studies have investigated the mucosal microbiome in pre-cancerous bowel polyps. The short-read sequencing of variable regions in the 16S rRNA gene has commonly been used to infer bacterial taxonomy, and this has led, in part, to inconsistent findings between studies. Here, we examined mucosal microbiota from patients who presented with one or more polyps, compared to patients with no polyps, at the time of colonoscopy. We evaluated the results obtained using both short-read and PacBio long-read 16S rRNA sequencing. Neither sequencing technology identified significant differences in microbial diversity measures between patients with or without bowel polyps. Differential abundance measures showed that amplicon sequence variants (ASVs) associated with Ruminococcus gnavus and Escherichia coli were elevated in mucosa from polyp patients, while ASVs associated with Parabacteroides merdae, Veillonella nakazawae, and Sutterella wadsworthensis were relatively decreased. Only R. gnavus was consistently identified using both sequencing technologies as being altered between patients with polyps compared to patients without polyps, suggesting differences in technologies and bioinformatics processing impact study findings. Several of the differentially abundant bacteria identified using either sequencing technology are associated with inflammatory bowel diseases despite these patients being excluded from the current study, which suggests that early bowel neoplasia may be associated with a local inflammatory niche.
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Affiliation(s)
- Zoe Welham
- Bowel Cancer and Biomarker Laboratory, School of Medical Sciences, The University of Sydney, Sydney 2065, Australia; (Z.W.); (J.L.)
| | - Jun Li
- Bowel Cancer and Biomarker Laboratory, School of Medical Sciences, The University of Sydney, Sydney 2065, Australia; (Z.W.); (J.L.)
| | - Alexander F. Engel
- Colorectal Surgical Unit, Royal North Shore Hospital, Sydney 2065, Australia;
- Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney 2050, Australia
| | - Mark P. Molloy
- Bowel Cancer and Biomarker Laboratory, School of Medical Sciences, The University of Sydney, Sydney 2065, Australia; (Z.W.); (J.L.)
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3
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Chen M, Yao H, Tan H, Huang W, Wu Q, Nie S. Impact of Bifidobacterium longum NSP001 on DSS-induced colitis in conventional and humanised mice. FOOD SCIENCE AND HUMAN WELLNESS 2023. [DOI: 10.1016/j.fshw.2022.10.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Wong CC, Yu J. Gut microbiota in colorectal cancer development and therapy. Nat Rev Clin Oncol 2023:10.1038/s41571-023-00766-x. [PMID: 37169888 DOI: 10.1038/s41571-023-00766-x] [Citation(s) in RCA: 55] [Impact Index Per Article: 55.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/13/2023] [Indexed: 05/13/2023]
Abstract
Colorectal cancer (CRC) is one of the commonest cancers globally. A unique aspect of CRC is its intimate association with the gut microbiota, which forms an essential part of the tumour microenvironment. Research over the past decade has established that dysbiosis of gut bacteria, fungi, viruses and Archaea accompanies colorectal tumorigenesis, and these changes might be causative. Data from mechanistic studies demonstrate the ability of the gut microbiota to interact with the colonic epithelia and immune cells of the host via the release of a diverse range of metabolites, proteins and macromolecules that regulate CRC development. Preclinical and some clinical evidence also underscores the role of the gut microbiota in modifying the therapeutic responses of patients with CRC to chemotherapy and immunotherapy. Herein, we summarize our current understanding of the role of gut microbiota in CRC and outline the potential translational and clinical implications for CRC diagnosis, prevention and treatment. Emphasis is placed on how the gut microbiota could now be better harnessed by developing targeted microbial therapeutics as chemopreventive agents against colorectal tumorigenesis, as adjuvants for chemotherapy and immunotherapy to boost drug efficacy and safety, and as non-invasive biomarkers for CRC screening and patient stratification. Finally, we highlight the hurdles and potential solutions to translating our knowledge of the gut microbiota into clinical practice.
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Affiliation(s)
- Chi Chun Wong
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Jun Yu
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China.
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5
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Wei X, Yu L, Zhang C, Ni Y, Zhang H, Zhai Q, Tian F. Genetic-Phenotype Analysis of Bifidobacterium bifidum and Its Glycoside Hydrolase Gene Distribution at Different Age Groups. Foods 2023; 12:foods12050922. [PMID: 36900439 PMCID: PMC10000437 DOI: 10.3390/foods12050922] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Revised: 02/18/2023] [Accepted: 02/20/2023] [Indexed: 02/24/2023] Open
Abstract
Human gut microbiota interfere with host development and aging. Bifidobacterium is a microbial genus found in the human digestive tract that has probiotic activities such as improving constipation and enhancing immunity. The species and numbers present change with age, but there has been limited research on probiotic gut microbiota at specific ages. This study analyzed the distribution of 610 bifidobacteria in subjects in several age groups (0-17, 18-65, and 66-108 y) using 486 fecal samples and determined the distribution of glycoside hydrolases based on genetic analysis of strains representing 85% of the Bifidobacterium species abundance in each age group. 6'-Sialyllactose is a major component of acidic breast milk oligosaccharides, which can promote human neurogenesis and bifidobacteria growth. Using genotypic and phenotypic association analysis, we investigated the utilization of 6'-sialyllactose by six B. bifidum strains isolated from subjects 0-17 and 18-65 y. A comparative genomic analysis of the six B. bifidum strains revealed differences in genomic features across age groups. Finally, the safety of these strains was evaluated by antibiotic gene and drug resistance phenotype analysis. Our results reveal that the distribution of glycoside hydrolase genes in B. bifidum varies with age, thus affecting the phenotypic results. This provides important insights for the design and application of probiotic products for different ages.
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Affiliation(s)
- Xiaojing Wei
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Leilei Yu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China
- Correspondence: ; Tel./Fax: +86-510-85912155
| | - Chuan Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Yongqing Ni
- School of Food Science and Technology, Shihezi University, Shihezi 832000, China
| | - Hao Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China
| | - Qixiao Zhai
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China
| | - Fengwei Tian
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China
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6
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Kumar R, Maurya AK, Parker KD, Kant R, Ibrahim H, Kabir MI, Kumar D, Weber AM, Agarwal R, Kuhn KA, Ryan EP, Raina K. Gender-based effect of absence of gut microbiota on the protective efficacy of Bifidobacterium longum-fermented rice bran diet against inflammation-associated colon tumorigenesis. Mol Carcinog 2022; 61:941-957. [PMID: 35856887 PMCID: PMC9474629 DOI: 10.1002/mc.23452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 07/01/2022] [Indexed: 12/19/2022]
Abstract
Dietary rice bran (RB) has shown capacity to influence metabolism by modulation of gut microbiota in individuals at risk for colorectal cancer (CRC), which warranted attention for delineating mechanisms for bidirectional influences and cross-feeding between the host and RB-modified gut microbiota to reduce CRC. Accordingly, in the present study, fermented rice bran (FRB, fermented with a RB responsive microbe Bifidobacterium longum), and non-fermented RB were fed as 10% w/w (diet) to gut microbiota-intactspf or germ-free micegf to investigate comparative efficacy against inflammation-associated azoxymethane/dextran sodium sulfate (AOM/DSS)-induced CRC. Results indicated both microbiota-dependent and independent mechanisms for RB meditated protective efficacy against CRC that was associated with reduced neoplastic lesion size and local-mucosal/systemic inflammation, and restoration of colonic epithelial integrity. Enrichment of beneficial commensals (such as, Clostridiales, Blautia, Roseburia), phenolic metabolites (benzoate and catechol metabolism), and dietary components (ferulic acid-4 sulfate, trigonelline, and salicylate) were correlated with anti-CRC efficacy. Germ-free studies revealed gender-specific physiological variables could differentially impact CRC growth and progression. In the germ-free females, the RB dietary treatment showed a ∼72% reduction in the incidence of colonic epithelial erosion when compared to the ∼40% reduction in FRB-fed micegf . Ex vivo fermentation of RB did not parallel the localized-protective benefits of gut microbial metabolism by RB in damaged colonic tissues. Findings from this study suggest potential needs for safety considerations of fermented fiber rich foods as dietary strategies against severe inflammation-associated colon tumorigenesis (particularly with severe damage to the colonic epithelium).
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Affiliation(s)
- Robin Kumar
- Department of Pharmaceutical Sciences, South Dakota State University, Brookings, South Dakota, USA
| | - Akhilendra K Maurya
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Kristopher D Parker
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado, USA
- Department of Natural Sciences, Middle Georgia State University, Cochran, GA, USA
| | - Rama Kant
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Hend Ibrahim
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado, USA
- Department of Medical Biochemistry, Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Md Imtiazul Kabir
- Department of Pharmaceutical Sciences, South Dakota State University, Brookings, South Dakota, USA
| | - Dileep Kumar
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Annika M Weber
- Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, Colorado, USA
| | - Rajesh Agarwal
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Kristine A Kuhn
- Division of Rheumatology, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Elizabeth P Ryan
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado, USA
| | - Komal Raina
- Department of Pharmaceutical Sciences, South Dakota State University, Brookings, South Dakota, USA
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
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7
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Bi Z, Cui E, Yao Y, Chang X, Wang X, Zhang Y, Xu GX, Zhuang H, Hua ZC. Recombinant Bifidobacterium longum Carrying Endostatin Protein Alleviates Dextran Sodium Sulfate-Induced Colitis and Colon Cancer in Rats. Front Microbiol 2022; 13:927277. [PMID: 35847065 PMCID: PMC9280188 DOI: 10.3389/fmicb.2022.927277] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Accepted: 06/06/2022] [Indexed: 12/02/2022] Open
Abstract
Bifidobacterium has been widely administrated orally as probiotics to prevent pathogen colonization and modulate the gut microbiome balance. Endostatin is an endogenous inhibitor of angiogenesis and has been shown to inhibit tumor growth, invasion, and metastasis. At present, the combination of endostatin and chemotherapeutic drugs has been regarded as a promising antitumor treatment strategy. In this study, we selected a safe strain of Bifidobacterium longum as a delivery system to transport endostatin to the gastrointestinal tract and explored their combined effect on inflammatory bowel disease (IBD) and colitis-associated cancer. The results indicated that B. longum-Endo relieved dextran sulfate sodium-induced body weight loss, diarrhea, colon shortening, and epithelium damage. Long-term oral administration of B. longum-Endo significantly decreased tumor formation rate, tumor number, and tumor size. Moreover, the effect of B. longum-Endo on gut microbiota dysbiosis was also confirmed by 16S rRNA sequencing analysis. The levels of potentially beneficial bacteria, such as Lactobacillus, Bifidobacterium, Allobaculum, and Parabateroides, were increased in the B. longum-Endo group compared to the model and B. longum groups. Meanwhile, levels of potentially pathogenic bacteria including Desulfovibrio, Helicobacter, and Enterorhabdus were decreased. Taken together, these results suggested that oral administration of recombinant B. longum-Endo strain may be a promising therapeutic strategy for IBD and colitis-associated cancer.
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Affiliation(s)
- Zhiqian Bi
- The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
| | - Enqing Cui
- The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
| | - Yingying Yao
- The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
| | - Xiaoyao Chang
- The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
| | - Xiaoyang Wang
- The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
| | - Yuhui Zhang
- The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
| | - Gen-Xing Xu
- The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
- *Correspondence: Gen-Xing Xu,
| | - Hongqin Zhuang
- The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
- Hongqin Zhuang,
| | - Zi-Chun Hua
- The State Key Laboratory of Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing, China
- Changzhou High-Tech Research Institute of Nanjing University, Changzhou, China
- Jiangsu Target Pharma Laboratories Inc., Changzhou, China
- School of Biopharmacy, China Pharmaceutical University, Nanjing, China
- Zi-Chun Hua,
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8
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Davoodvandi A, Fallahi F, Tamtaji OR, Tajiknia V, Banikazemi Z, Fathizadeh H, Abbasi-Kolli M, Aschner M, Ghandali M, Sahebkar A, Taghizadeh M, Mirzaei H. An Update on the Effects of Probiotics on Gastrointestinal Cancers. Front Pharmacol 2021; 12:680400. [PMID: 34992527 PMCID: PMC8724544 DOI: 10.3389/fphar.2021.680400] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 11/26/2021] [Indexed: 12/28/2022] Open
Abstract
Because of their increasing prevalence, gastrointestinal (GI) cancers are regarded as an important global health challenge. Microorganisms residing in the human GI tract, termed gut microbiota, encompass a large number of living organisms. The role of the gut in the regulation of the gut-mediated immune responses, metabolism, absorption of micro- and macro-nutrients and essential vitamins, and short-chain fatty acid production, and resistance to pathogens has been extensively investigated. In the past few decades, it has been shown that microbiota imbalance is associated with the susceptibility to various chronic disorders, such as obesity, irritable bowel syndrome, inflammatory bowel disease, asthma, rheumatoid arthritis, psychiatric disorders, and various types of cancer. Emerging evidence has shown that oral administration of various strains of probiotics can protect against cancer development. Furthermore, clinical investigations suggest that probiotic administration in cancer patients decreases the incidence of postoperative inflammation. The present review addresses the efficacy and underlying mechanisms of action of probiotics against GI cancers. The safety of the most commercial probiotic strains has been confirmed, and therefore these strains can be used as adjuvant or neo-adjuvant treatments for cancer prevention and improving the efficacy of therapeutic strategies. Nevertheless, well-designed clinical studies are still needed for a better understanding of the properties and mechanisms of action of probiotic strains in mitigating GI cancer development.
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Affiliation(s)
- Amirhossein Davoodvandi
- Student Research Committee, Kashan University of Medical Sciences, Kashan, Iran
- Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Farzaneh Fallahi
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran
| | - Omid Reza Tamtaji
- Students’ Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Vida Tajiknia
- Department of Surgery, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Zarrin Banikazemi
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran
| | - Hadis Fathizadeh
- Department of Laboratory Sciences, Sirjan Faculty of Medicine Sciences, Sirjan, Iran
| | - Mohammad Abbasi-Kolli
- Department of Medical Genetics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, United States
| | - Maryam Ghandali
- School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Amirhossein Sahebkar
- Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohsen Taghizadeh
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran
| | - Hamed Mirzaei
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Institute for Basic Sciences, Kashan University of Medical Sciences, Kashan, Iran
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Lyu B, Wang Y, Zhang X, Chen Y, Fu H, Liu T, Hao J, Li Y, Yu H, Jiang L. Changes of High-Purity Insoluble Fiber from Soybean Dregs (Okara) after Being Fermented by Colonic Flora and Its Adsorption Capacity. Foods 2021; 10:foods10102485. [PMID: 34681533 PMCID: PMC8536182 DOI: 10.3390/foods10102485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 10/10/2021] [Accepted: 10/14/2021] [Indexed: 11/24/2022] Open
Abstract
In order to explore the changes and properties of high-purity insoluble dietary fiber from okara (HPIDF) after entering the colon and be fermented by colonic flora, fermented high-purity insoluble dietary fiber (F-HPIDF) was obtained by simulated fermentation in vitro by HPIDF and colonic flora from C57BL/6 mice. For exploring the differences of HPIDF and F-HPIDF, the changes of structure (SEM. FTIR, XRD, particle size, specific surface area, monosaccharide composition) and adsorption properties (water, oil, heavy metal irons, harmful substances) of HPIDF/F-HPIDF were explored. The results showed that F-HPIDF had a higher water-holding capacity (19.17 g/g), water-swelling capacity (24.83 mL/g), heavy metals-adsorption capacity (Cd2+: 1.82 μmol/g; Pb2+: 1.91 μmol/g; Zn2+: 1.30 μmol/g; Cu2+: 0.68 μmol/g), and harmful substances-adsorption capacity (GAC: 0.23 g/g; CAC: 14.80 mg/g; SCAC: 0.49 g/g) than HPIDF due to the changes of structure caused by fermentation. In addition, with the fermentation of HPIDF, some beneficial substances were produced, which might be potential intestinal prebiotics. The study of F-HPIDF strengthens the speculation that HPIDF may have potential bioactivities after entering the colon, which proved that okara-HPIDF may have potential functionality.
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Affiliation(s)
- Bo Lyu
- College of Food Science, Northeast Agricultural University, Harbin 150030, China; (B.L.); (X.Z.); (Y.L.)
- Soybean Research & Development Center, Division of Soybean Processing, Chinese Agricultural Research System, Changchun 130118, China; (Y.W.); (Y.C.); (H.F.)
| | - Yi Wang
- Soybean Research & Development Center, Division of Soybean Processing, Chinese Agricultural Research System, Changchun 130118, China; (Y.W.); (Y.C.); (H.F.)
- College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China
| | - Xin Zhang
- College of Food Science, Northeast Agricultural University, Harbin 150030, China; (B.L.); (X.Z.); (Y.L.)
- Soybean Research & Development Center, Division of Soybean Processing, Chinese Agricultural Research System, Changchun 130118, China; (Y.W.); (Y.C.); (H.F.)
| | - Yuxi Chen
- Soybean Research & Development Center, Division of Soybean Processing, Chinese Agricultural Research System, Changchun 130118, China; (Y.W.); (Y.C.); (H.F.)
- College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China
| | - Hongling Fu
- Soybean Research & Development Center, Division of Soybean Processing, Chinese Agricultural Research System, Changchun 130118, China; (Y.W.); (Y.C.); (H.F.)
- College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China
| | - Tong Liu
- College of Food Science and Engineering, Changchun University, Changchun 130118, China;
| | - Jianyu Hao
- School of Food and Biotechnology, Changchun Vocational Institute of Technology, Changchun 130118, China;
| | - Yang Li
- College of Food Science, Northeast Agricultural University, Harbin 150030, China; (B.L.); (X.Z.); (Y.L.)
- Soybean Research & Development Center, Division of Soybean Processing, Chinese Agricultural Research System, Changchun 130118, China; (Y.W.); (Y.C.); (H.F.)
| | - Hansong Yu
- Soybean Research & Development Center, Division of Soybean Processing, Chinese Agricultural Research System, Changchun 130118, China; (Y.W.); (Y.C.); (H.F.)
- College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China
- Correspondence: (H.Y.); (L.J.); Tel.: +86-133-3176-0468 (H.Y.); +86-139-0465-1669 (L.J.)
| | - Lianzhou Jiang
- College of Food Science, Northeast Agricultural University, Harbin 150030, China; (B.L.); (X.Z.); (Y.L.)
- Soybean Research & Development Center, Division of Soybean Processing, Chinese Agricultural Research System, Changchun 130118, China; (Y.W.); (Y.C.); (H.F.)
- Correspondence: (H.Y.); (L.J.); Tel.: +86-133-3176-0468 (H.Y.); +86-139-0465-1669 (L.J.)
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10
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Microbiomics in Collusion with the Nervous System in Carcinogenesis: Diagnosis, Pathogenesis and Treatment. Microorganisms 2021; 9:microorganisms9102129. [PMID: 34683450 PMCID: PMC8538279 DOI: 10.3390/microorganisms9102129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/23/2021] [Accepted: 09/27/2021] [Indexed: 11/17/2022] Open
Abstract
The influence of the naturally occurring population of microbes on various human diseases has been a topic of much recent interest. Not surprisingly, continuously growing attention is devoted to the existence of a gut brain axis, where the microbiota present in the gut can affect the nervous system through the release of metabolites, stimulation of the immune system, changing the permeability of the blood–brain barrier or activating the vagus nerves. Many of the methods that stimulate the nervous system can also lead to the development of cancer by manipulating pathways associated with the hallmarks of cancer. Moreover, neurogenesis or the creation of new nervous tissue, is associated with the development and progression of cancer in a similar manner as the blood and lymphatic systems. Finally, microbes can secrete neurotransmitters, which can stimulate cancer growth and development. In this review we discuss the latest evidence that support the importance of microbiota and peripheral nerves in cancer development and dissemination.
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Sikavi DR, Nguyen LH, Haruki K, Ugai T, Ma W, Wang DD, Thompson KN, Yan Y, Branck T, Wilkinson JE, Akimoto N, Zhong R, Lau MC, Mima K, Kosumi K, Morikawa T, Rimm EB, Garrett WS, Izard J, Cao Y, Song M, Huttenhower C, Ogino S, Chan AT. The Sulfur Microbial Diet and Risk of Colorectal Cancer by Molecular Subtypes and Intratumoral Microbial Species in Adult Men. Clin Transl Gastroenterol 2021; 12:e00338. [PMID: 34333506 PMCID: PMC8323793 DOI: 10.14309/ctg.0000000000000338] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 03/05/2021] [Indexed: 01/22/2023] Open
Abstract
INTRODUCTION We recently described the sulfur microbial diet, a pattern of intake associated with increased gut sulfur-metabolizing bacteria and incidence of distal colorectal cancer (CRC). We assessed whether this risk differed by CRC molecular subtypes or presence of intratumoral microbes involved in CRC pathogenesis (Fusobacterium nucleatum and Bifidobacterium spp.). METHODS We performed Cox proportional hazards modeling to examine the association between the sulfur microbial diet and incidence of overall and distal CRC by molecular and microbial subtype in the Health Professionals Follow-Up Study (1986-2012). RESULTS We documented 1,264 incident CRC cases among 48,246 men, approximately 40% of whom had available tissue data. After accounting for multiple hypothesis testing, the relationship between the sulfur microbial diet and CRC incidence did not differ by subtype. However, there was a suggestion of an association by prostaglandin synthase 2 (PTGS2) status with a multivariable adjusted hazard ratio for highest vs lowest tertile of sulfur microbial diet scores of 1.31 (95% confidence interval: 0.99-1.74, Ptrend = 0.07, Pheterogeneity = 0.04) for PTGS2-high CRC. The association of the sulfur microbial diet with distal CRC seemed to differ by the presence of intratumoral Bifidobacterium spp. with an adjusted hazard ratio for highest vs lowest tertile of sulfur microbial diet scores of 1.65 (95% confidence interval: 1.14-2.39, Ptrend = 0.01, Pheterogeneity = 0.03) for Bifidobacterium-negative distal CRC. We observed no apparent heterogeneity by other tested molecular markers. DISCUSSION Greater long-term adherence to the sulfur microbial diet could be associated with PTGS2-high and Bifidobacterium-negative distal CRC in men. Additional studies are needed to further characterize the role of gut microbial sulfur metabolism and CRC.
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Affiliation(s)
- Daniel R. Sikavi
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Long H. Nguyen
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Koichiro Haruki
- Program in MPE Molecular Pathological Epidemiology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Tomotaka Ugai
- Program in MPE Molecular Pathological Epidemiology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Wenjie Ma
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Dong D. Wang
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
- Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Kelsey N. Thompson
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
| | - Yan Yan
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Tobyn Branck
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Jeremy E. Wilkinson
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Naohiko Akimoto
- Program in MPE Molecular Pathological Epidemiology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Rong Zhong
- Program in MPE Molecular Pathological Epidemiology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Mai Chan Lau
- Program in MPE Molecular Pathological Epidemiology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Kosuke Mima
- Program in MPE Molecular Pathological Epidemiology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Keisuke Kosumi
- Program in MPE Molecular Pathological Epidemiology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Teppei Morikawa
- Program in MPE Molecular Pathological Epidemiology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Eric B. Rimm
- Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Wendy S. Garrett
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
- Department of Medicine, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
| | - Jacques Izard
- Department of Food Science and Technology, University of Nebraska, Lincoln, Nebraska, USA
- Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Yin Cao
- Division of Public Health Sciences, Department of Surgery, Washington University School of Medicine, St Louis, Missouri, USA
- Alvin J. Siteman Cancer Center, Washington University School of Medicine, St Louis, Missouri, USA
| | - Mingyang Song
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
- Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Curtis Huttenhower
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
- Department of Immunology and Infectious Disease, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Shuji Ogino
- Program in MPE Molecular Pathological Epidemiology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
- Cancer Immunology and Cancer Epidemiology Programs, Dana-Farber Harvard Cancer Center, Boston, Massachusetts, USA
| | - Andrew T. Chan
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Broad Institute of MIT and Harvard, Cambridge, Massachusetts, USA
- Department of Immunology and Infectious Disease, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
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12
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Mughal MJ, Kwok HF. Multidimensional role of bacteria in cancer: Mechanisms insight, diagnostic, preventive and therapeutic potential. Semin Cancer Biol 2021; 86:1026-1044. [PMID: 34119644 DOI: 10.1016/j.semcancer.2021.06.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 05/28/2021] [Accepted: 06/08/2021] [Indexed: 02/08/2023]
Abstract
The active role of bacteria in oncogenesis has long been a topic of debate. Although, it was speculated to be a transmissible cause of cancer as early as the 16th-century, yet the idea about the direct involvement of bacteria in cancer development has only been explored in recent decades. More recently, several studies have uncovered the mechanisms behind the carcinogenic potential of bacteria which are inflammation, immune evasion, pro-carcinogenic metabolite production, DNA damage and genomic instability. On the other side, the recent development on the understanding of tumor microenvironment and technological advancements has turned this enemy into an ally. Studies using bacteria for cancer treatment and detection have shown noticeable effects. Therapeutic abilities of bioengineered live bacteria such as high specificity, selective cytotoxicity to cancer cells, responsiveness to external signals and control after ingestion have helped to overcome the challenges faced by conventional cancer therapies and highlighted the bacterial based therapy as an ideal approach for cancer treatment. In this review, we have made an effort to compile substantial evidence to support the multidimensional role of bacteria in cancer. We have discussed the multifaceted role of bacteria in cancer by highlighting the wide impact of bacteria on different cancer types, their mechanisms of actions in inducing carcinogenicity, followed by the diagnostic and therapeutic potential of bacteria in cancers. Moreover, we have also highlighted the existing gaps in the knowledge of the association between bacteria and cancer as well as the limitation and advantage of bacteria-based therapies in cancer. A better understanding of these multidimensional roles of bacteria in cancer can open up the new doorways to develop early detection strategies, prevent cancer, and develop therapeutic tactics to cure this devastating disease.
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Affiliation(s)
- Muhammad Jameel Mughal
- Cancer Centre, Faculty of Health Sciences, University of Macau, Avenida de Universidade, Taipa, Macau
| | - Hang Fai Kwok
- Cancer Centre, Faculty of Health Sciences, University of Macau, Avenida de Universidade, Taipa, Macau; MOE Frontiers Science Center for Precision Oncology, University of Macau, Avenida de Universidade, Taipa, Macau.
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13
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Probiotic Aspergillus oryzae produces anti-tumor mediator and exerts anti-tumor effects in pancreatic cancer through the p38 MAPK signaling pathway. Sci Rep 2021; 11:11070. [PMID: 34040123 PMCID: PMC8154913 DOI: 10.1038/s41598-021-90707-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/17/2021] [Indexed: 12/19/2022] Open
Abstract
Intake of probiotics or fermented food produced by some probiotic bacteria is believed to exert anti-tumor functions in various cancers, including pancreatic cancer, because several studies have demonstrated the anti-tumor effects of probiotic bacteria in vitro and in vivo in animal carcinogenesis models. However, the mechanisms underlying the anticancer effects of probiotics on pancreatic cancer have not been clarified. In this study, we assessed the anti-tumor effects of probiotic bacteria against pancreatic cancer cells. Among the known probiotic bacteria, Aspergillus oryzae exhibited a strong pancreatic tumor suppression effect. The culture supernatant of A. oryzae was separated by HPLC. Heptelidic acid was identified as an anti-tumor molecule derived from A. oryzae by LC–MS and NMR analysis. The anti-tumor effect of heptelidic acid was exhibited in vitro and in vivo in a xenograft model of pancreatic cancer cells. The anti-tumor effect of heptelidic acid was exerted by the p38 MAPK signaling pathway. Heptelidic acid traverses the intestinal mucosa and exerts anti-tumor effects on pancreatic cancer cells. This is a novel anti-tumor mechanism induced by beneficial bacteria against pancreatic cancer in which bacterial molecules pass through the intestinal tract, reach the extra-intestinal organs, and then induce apoptosis via an inducible signaling pathway.
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Uyar A, Doğan A, Yaman T, Keleş ÖF, Yener Z, Çelik İ, Alkan EE. The Protective Role of Urtica dioica Seed Extract Against Azoxymethane-Induced Colon Carcinogenesis in Rats. Nutr Cancer 2021; 74:306-319. [PMID: 33560145 DOI: 10.1080/01635581.2021.1881568] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The aim of this study was to investigate the protective role of Urtica dioica seed (UDS) extract against azoxymethane (AOM)-induced colon carcinogenesis in rats. Thirty-two male Wistar albino rats were divided into four groups: Control, AOM, AOM + UDS, and UDS. The AOM and AOM + UDS groups were induced by AOM (15 mg/kg body weight) subcutaneously once a week for 10 weeks. AOM + UDS and UDS groups additionally received fed with pellets included 30 ml/kg UDS extract. At the end of the trial, blood and colon tissue samples were taken from the rats following necropsy. The gross and histopathological findings revealed that the administration of UDS extract significantly decreased lesions including aberrant cript foci, adenoma, and adenocarcinoma formation both numerically and dimensionally. Immunohistochemically, slight CEA and COX-2, strong Caspase-3 immune-expressions were detected in the group AOM + UDS compared to AOM group. Biochemical examinations indicated that a markedly increase in the malondialdehyde and fluctuated antioxidant defense system constituents levels such as reduced glutathione, glutathione s-transferase, glutathione peroxidase, superoxide dismutase were restored in AOM + UDS group. These results reveal that the UDS may act as a chemopreventive dietary agent, inducing apoptosis, resulting in a significant reduction of colon carcinogenesis.
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Affiliation(s)
- Ahmet Uyar
- Faculty of Veterinary Medicine, Department of Pathology, Hatay Mustafa Kemal University, Hatay, Turkey
| | - Abdulahad Doğan
- Faculty of Pharmacy, Department of Biochemistry, Van Yuzuncu Yil University, Van, Turkey
| | - Turan Yaman
- Faculty of Veterinary Medicine, Department of Pathology, Van Yuzuncu Yil University, Van, Turkey
| | - Ömer Faruk Keleş
- Faculty of Veterinary Medicine, Department of Pathology, Van Yuzuncu Yil University, Van, Turkey
| | - Zabit Yener
- Faculty of Veterinary Medicine, Department of Pathology, Van Yuzuncu Yil University, Van, Turkey
| | - İsmail Çelik
- Faculty of Science, Department of Molecular Biology and Genetics, Van Yuzuncu Yil University, Van, Turkey
| | - Elif Ebru Alkan
- Faculty of Science, Department of Molecular Biology and Genetics, Van Yuzuncu Yil University, Van, Turkey
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15
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Thøgersen R, Bertram HC. Reformulation of processed meat to attenuate potential harmful effects in the gastrointestinal tract – A review of current knowledge and evidence of health prospects. Trends Food Sci Technol 2021. [DOI: 10.1016/j.tifs.2020.12.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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16
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Brasiel PGDA, Dutra Luquetti SCP, Peluzio MDCG, Novaes RD, Gonçalves RV. Preclinical Evidence of Probiotics in Colorectal Carcinogenesis: A Systematic Review. Dig Dis Sci 2020; 65:3197-3210. [PMID: 31960202 DOI: 10.1007/s10620-020-06062-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 01/09/2020] [Indexed: 12/24/2022]
Abstract
BACKGROUND Colorectal cancer, the second major cause of cancer deaths, imposes a major health burden worldwide. There is growing evidence that supports that the use of probiotics is effective against various diseases, especially in gastrointestinal diseases, including the colorectal cancer, but the differences between the strains, dose, and frequency used are not yet clear. AIMS To perform a systematic review to compile the results of studies carried out in animal models and investigated the effect of probiotics on colorectal carcinogenesis. METHODS Studies were selected in PubMed/MEDLINE and Scopus according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Search filters were developed using three parameters: probiotics, colorectal cancer, and animal model. RESULTS From a structured search, we discovered 34 original articles and submitted them to a risk of bias analysis using SYRCLE's tool. The studies show a great diversity of models, most were conducted in rats (55.8%) and used 1,2 dimethylhydrazine as the drug to induce colorectal carcinogenesis (61.7%). The vast majority of trials investigated Lactobacillus (64%) and Bifidobacterium (29.4%) strains. Twenty-six (86.6%) studies found significant reduction in lesions or tumors in the animals that received probiotics. The main methodological limitation was the insufficient amount of information for the adequate reproducibility of the trials, which indicated a high risk of bias due to incomplete characterization of the experimental design. CONCLUSIONS The different probiotics' strains showed anti-carcinogenic effect, reduced the development of lesions and intestinal tumors, antioxidant and immunomodulatory activity, and reduced fecal bacterial enzymes.
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Affiliation(s)
| | | | | | - Rômulo Dias Novaes
- Department of Structural Biology, Federal University of Alfenas, Alfenas, MG, Brazil
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17
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Phipps O, Al-Hassi HO, Quraishi MN, Kumar A, Brookes MJ. Influence of Iron on the Gut Microbiota in Colorectal Cancer. Nutrients 2020; 12:nu12092512. [PMID: 32825236 PMCID: PMC7551435 DOI: 10.3390/nu12092512] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/07/2020] [Accepted: 08/14/2020] [Indexed: 12/11/2022] Open
Abstract
Perturbations of the colonic microbiota can contribute to the initiation and progression of colorectal cancer, leading to an increase in pathogenic bacteria at the expense of protective bacteria. This can contribute to disease through increasing carcinogenic metabolite/toxin production, inducing inflammation, and activating oncogenic signaling. To limit disease progression, external factors that may influence the colonic microbiota need to be considered in patients with colorectal cancer. One major factor that can influence the colonic microbiota is iron. Iron is an essential micronutrient that is required by both prokaryotes and eukaryotes for cellular function. Most pathogenic bacteria have heightened iron acquisition mechanisms and therefore tend to outcompete protective bacteria for free iron. Colorectal cancer patients often present with anemia due to iron deficiency, and thus they require iron therapy. Depending upon the route of administration, iron therapy has the potential to contribute to a procarciongenic microbiota. Orally administered iron is the common treatment for anemia in these patients but can lead to an increased gut iron concentration. This suggests the need to reassess the route of iron therapy in these patients. Currently, this has only been assessed in murine studies, with human trials being necessary to unravel the potential microbial outcomes of iron therapy.
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Affiliation(s)
- Oliver Phipps
- Research Institute in Healthcare Science, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK; (H.O.A.-H.); (A.K.); (M.J.B.)
- Correspondence:
| | - Hafid O. Al-Hassi
- Research Institute in Healthcare Science, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK; (H.O.A.-H.); (A.K.); (M.J.B.)
| | - Mohammed N. Quraishi
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham B15 2TT, UK;
| | - Aditi Kumar
- Research Institute in Healthcare Science, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK; (H.O.A.-H.); (A.K.); (M.J.B.)
- Royal Wolverhampton Hospitals NHS Trust, Gastroenterology Unit, Wolverhampton WV10 0QP, UK
| | - Matthew J. Brookes
- Research Institute in Healthcare Science, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton WV1 1LY, UK; (H.O.A.-H.); (A.K.); (M.J.B.)
- Royal Wolverhampton Hospitals NHS Trust, Gastroenterology Unit, Wolverhampton WV10 0QP, UK
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18
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Diversity of Gut Microbiota and Bifidobacterial Community of Chinese Subjects of Different Ages and from Different Regions. Microorganisms 2020; 8:microorganisms8081108. [PMID: 32722057 PMCID: PMC7464982 DOI: 10.3390/microorganisms8081108] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 07/13/2020] [Accepted: 07/22/2020] [Indexed: 12/12/2022] Open
Abstract
Gut microbiota composition and functionality are closely linked to host health. In this study, the fecal microbiota and bifidobacterial communities of 111 healthy volunteers from four regions of China of varying age profiles (Child, 1–5 years; Young, 18–50 years; Elder, 60–80 years; Longevity, ≥90 years) were investigated via high-throughput sequencing. Canonical analysis revealed that the gut microbiota, as well as bifidobacteria profiles of the subjects, clustered according to their regions and age. Eight genera were shared among all subjects, however, certain genera distributed differently in subjects grouped by region and age. Faecalibacterium was enriched in samples from Zhongxiang, unclassified Ruminococcaceae and Christensenellaceae were enriched in the Longevity group, and Bifidobacterium was enriched in Child. Within Bifidobacterium, B. longum was the most abundant species in almost all samples except for Child, in which B. pseudocatenulatum was the most abundant. Additionally, the abundances of B. adolescentis and B. dentium were lower in Child. In conclusion, our results suggest that geography and age affect the structure of the gut microbiota, as well as Bifidobacterium composition, and this variation may greatly associate with the metabolic and immune changes that occur during the process of aging.
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Heydari Z, Rahaie M, Alizadeh AM, Agah S, Khalighfard S, Bahmani S. Effects of Lactobacillus acidophilus and Bifidobacterium bifidum Probiotics on the Expression of MicroRNAs 135b, 26b, 18a and 155, and Their Involving Genes in Mice Colon Cancer. Probiotics Antimicrob Proteins 2020; 11:1155-1162. [PMID: 30311185 DOI: 10.1007/s12602-018-9478-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A wide range of sources supports that the link between diet and colorectal cancer may be due to an imbalance of the intestinal microflora. In this case, it seems that the probiotics may have a possible molecular mechanism via microRNAs (miRNAs). The present study is aimed to evaluate the effects of Lactobacillus acidophilus and Bifidobacterium bifidum probiotics on the expression of miRNAs 135b, 26b, 18a, and 155 and their target genes, including APC, PTEN, KRAS, and PU.1 in mouse azoxymethane (AOM)-induced colon cancer. Thirty-eight male BALB/c mice were randomly divided into four groups: the control, AOM, Lactobacillus acidophilus, and Bifidobacterium bifidum to deliberate the effects of the probiotics on the miRNAs and their target genes. Except for the control group, the rest groups were weekly given AOM (15 mg/kg, s.c) in three consecutive weeks to induce mouse colon cancer. The animals were given 1.5 g powders of L. acidophilus (1 × 109 cfu/g) and B. bifidum (1 × 109 cfu/g) in 30 cc drinking water in the related groups for 5 months. At the end of the study, the animals were sacrificed and their blood and colon samples were removed for the molecular analyses. The results showed that the expression of the miR-135b, miR-155, and KRAS was increased in the AOM group compared to the control group in both the plasma and the colon tissue samples, and the consumption of the probiotics decreased their expression. Moreover, the miR-26b, miR-18a, APC, PU.1, and PTEN expressions were decreased in the AOM group compared to the control group and the consumption of the probiotics increased their expressions. It seems that Lactobacillus acidophilus and Bifidobacterium bifidum though increasing the expression of the tumor suppressor miRNAs and their target genes and decreasing the oncogenes can improve colon cancer treatment.
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Affiliation(s)
- Zahra Heydari
- Department of Life Science Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
| | - Mahdi Rahaie
- Department of Life Science Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
| | - Ali Mohammad Alizadeh
- Cancer Research Center, Tehran University of Medical Sciences, Tehran, 1419733141, Iran.
- Cancer Biology Research Center, Tehran University of Medical Science, Tehran, Iran.
| | - Shahram Agah
- Colorectal Research Center, Iran University of Medical Sciences, Tehran, Iran.
| | - Solmaz Khalighfard
- Cancer Research Center, Tehran University of Medical Sciences, Tehran, 1419733141, Iran
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Sahar Bahmani
- Research and Development Department, Zist Takhmir Company, Tehran, Iran
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Harris S, Monteagudo-Mera A, Kosik O, Charalampopoulos D, Shewry P, Lovegrove A. Comparative prebiotic activity of mixtures of cereal grain polysaccharides. AMB Express 2019; 9:203. [PMID: 31865461 PMCID: PMC6925609 DOI: 10.1186/s13568-019-0925-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 12/03/2019] [Indexed: 01/06/2023] Open
Abstract
The main components of the non-starch polysaccharide (NSP) fraction of wheat flour are arabinoxylan (AX) and β-glucan. These are also present in other cereal grains, but their proportions vary with AX being the major component in wheat and rye and β-glucan in barley and oats. Therefore, it was hypothesised that these NSPs could act synergistically when fermented in vitro at the ratios present in the major foods consumed, resulting in increased prebiotic activity. AX and β-glucan were therefore tested in in vitro fermentation studies to assess their prebiotic activity when used individually and/or in different ratios. Short-chain fatty-acids (SCFAs) produced from in vitro fermentation were measured using HPLC and bacterial populations were measured using flow cytometry with fluorescence in situ hybridisation (Flow-FISH). Fermentation of AX alone resulted in a significant bifidogenic activity and increased concentrations of SCFAs, mainly acetate, after 8–24 h of fermentation, however β-glucan alone did not show prebiotic activity. The greatest prebiotic activity, based on concentration of total SCFAs and increases in total bacteria as well as beneficial Bifidobacterium and Clostridium coccoides/Eubacterium groups, was observed when AX and β-glucan were combined at a 3:1 ratio, which corresponds to their ratios in wheat flour which is major source of cereal fibre in the diet. This indicates that the population of bacteria in the human GI tract may be modulated by the composition of the fibre in the diet, to maximise the prebiotic potential.
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Novik G, Savich V. Beneficial microbiota. Probiotics and pharmaceutical products in functional nutrition and medicine. Microbes Infect 2019; 22:8-18. [PMID: 31233819 DOI: 10.1016/j.micinf.2019.06.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 06/06/2019] [Accepted: 06/12/2019] [Indexed: 12/12/2022]
Abstract
The article is mainly devoted to such representatives of gut microbiota as lactic acid bacteria and bifidobacteria, with minor accent on less frequently used or new probiotic microorganisms. Positive effects in treatment and prevention of diseases by different microbial groups, their metabolites and mechanisms of action, management and market of probiotic products are considered.
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Affiliation(s)
- Galina Novik
- Belarusian Collection of Microorganisms, Institute of Microbiology, National Academy of Sciences of Belarus, 2 Academician V.F. Kuprevich Street, 220141 Minsk, the Republic of Belarus.
| | - Victoria Savich
- Belarusian Collection of Microorganisms, Institute of Microbiology, National Academy of Sciences of Belarus, 2 Academician V.F. Kuprevich Street, 220141 Minsk, the Republic of Belarus
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22
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Probiotic Bacteria: A Promising Tool in Cancer Prevention and Therapy. Curr Microbiol 2019; 76:939-949. [PMID: 30949803 PMCID: PMC6586914 DOI: 10.1007/s00284-019-01679-8] [Citation(s) in RCA: 146] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 03/26/2019] [Indexed: 12/11/2022]
Abstract
Gut microbiota is widely considered to be one of the most important components to maintain balanced homeostasis. Looking forward, probiotic bacteria have been shown to play a significant role in immunomodulation and display antitumour properties. Bacterial strains could be responsible for detection and degradation of potential carcinogens and production of short-chain fatty acids, which affect cell death and proliferation and are known as signaling molecules in the immune system. Lactic acid bacteria present in the gut has been shown to have a role in regression of carcinogenesis due to their influence on immunomodulation, which can stand as a proof of interaction between bacterial metabolites and immune and epithelial cells. Probiotic bacteria have the ability to both increase and decrease the production of anti-inflammatory cytokines which play an important role in prevention of carcinogenesis. They are also capable of activating phagocytes in order to eliminate early-stage cancer cells. Application of heat-killed probiotic bacteria coupled with radiation had a positive influence on enhancing immunological recognition of cancer cells. In the absence of active microbiota, murine immunity to carcinogens has been decreased. There are numerous cohort studies showing the correlation between ingestion of dairy products and the risk of colon and colorectal cancer. An idea of using probiotic bacteria as vectors to administer drugs has emerged lately as several papers presenting successful results have been revealed. Within the next few years, probiotic bacteria as well as gut microbiota are likely to become an important component in cancer prevention and treatment.
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Eslami M, Yousefi B, Kokhaei P, Hemati M, Nejad ZR, Arabkari V, Namdar A. Importance of probiotics in the prevention and treatment of colorectal cancer. J Cell Physiol 2019; 234:17127-17143. [DOI: 10.1002/jcp.28473] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 02/10/2019] [Accepted: 02/19/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Majid Eslami
- Cancer Research Center, Semnan University of Medical Sciences Semnan Iran
| | - Bahman Yousefi
- Department of Immunology Semnan University of Medical Sciences Semnan Iran
| | - Parviz Kokhaei
- Cancer Research Center, Semnan University of Medical Sciences Semnan Iran
- Immune and Gene Therapy Lab, Cancer Centre Karolinska, Karolinska University Hospital Stockholm Sweden
| | - Maral Hemati
- Department of Immunology Semnan University of Medical Sciences Semnan Iran
| | | | - Vahid Arabkari
- Discipline of Pathology, Lambe Institute for Translational Research, Clinical Science Institute, School of Medicine, National University of Ireland Galway Ireland
| | - Afshin Namdar
- Department of Dentistry Faculty of Medicine and Dentistry, University of Alberta Edmonton Alberta Canada
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Harris S, Powers S, Monteagudo-Mera A, Kosik O, Lovegrove A, Shewry P, Charalampopoulos D. Determination of the prebiotic activity of wheat arabinogalactan peptide (AGP) using batch culture fermentation. Eur J Nutr 2019; 59:297-307. [PMID: 30725212 PMCID: PMC7000537 DOI: 10.1007/s00394-019-01908-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 01/23/2019] [Indexed: 02/06/2023]
Abstract
Purpose To test the prebiotic activity of wheat arabinogalactan-peptide (AGP), which is a soluble dietary fibre composed of arabinogalactan polysaccharide linked to a 15-residue peptide, which accounts for up to 0.4% of the dry weight of wheat flour. Methods The prebiotic activity of AGP prepared from white wheat flour was tested using in vitro fermentation by colonic bacteria in automated pH-controlled anaerobic stirred batch cultures and compared to fructooligosaccharide (FOS) and wheat flour arabinoxylan (AX). Bacterial populations were measured using fluorescence in situ hybridisation (flow-FISH) and short chain fatty acid (SCFA) concentrations were measured using HPLC. Results Fermentation of AGP resulted in a significant bifidogenic activity and increased concentrations of SCFAs, mainly acetate after 24 h of fermentation. Conclusions These results were comparable to those obtained with AX and confirm the prebiotic potential of AGP. Furthermore, fermentation of a mixture of AGP and AX was faster compared to the single substrates and more similar to FOS, indicating that combinations of fermentable carbohydrates with different structures are potentially more effective as prebiotics than single substrates. Electronic supplementary material The online version of this article (10.1007/s00394-019-01908-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Suzanne Harris
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, PO Box 226, Reading, RG6 6AP, UK. .,Department of Plant Science, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK.
| | - Stephen Powers
- Computational and Analytical Science, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK
| | - Andrea Monteagudo-Mera
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, PO Box 226, Reading, RG6 6AP, UK
| | - Ondrej Kosik
- Department of Plant Science, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK
| | - Alison Lovegrove
- Department of Plant Science, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK
| | - Peter Shewry
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, PO Box 226, Reading, RG6 6AP, UK.,Department of Plant Science, Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK
| | - Dimitris Charalampopoulos
- Department of Food and Nutritional Sciences, University of Reading, Whiteknights, PO Box 226, Reading, RG6 6AP, UK
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Abstract
Oligofructose and inulin, selective fermentable chicory fructans, have been shown to stimulate the growth of bifidobacteria which are regarded as beneficial strains in the colon. Studies were designed to evaluate inulin (Raftiline) and oligofructose (Raftilose), for their potential inhibitory properties against aberrant crypt foci (ACF) formation in the colon of rats. ACF are putative preneoplastic lesions from which adenomas and carcinomas may develop. The results of this study demonstrate that dietary administration of oligofructose and inulin inhibits the formation of preneoplastic lesions in the colon suggesting the potential colon tumour inhibitory properties of chicory fructans. Since these prebiotics selectively stimulate the growth of bifidobacteria, tumour inhibitory activity of lyophilized cultures of Bifidobacterium longum (BL) against azoxymethane (AOM)-induced colon carcinogenesis in rats and modulating effect of these cultures on colonic tumour cell proliferation, ornithine decarboxylase (ODC) activity, and ras-p21 oncoprotein expression were investigated. Dietary administration of lyophilized cultures of BL strongly suppressed AOM-induced colon tumour development. Inhibition of colon carcinogenesis was associated with a decrease in colonic mucosal cell proliferation and colonic mucosal and tumour ODC and ras-p21 activities.
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26
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Predicting the associations between microbes and diseases by integrating multiple data sources and path-based HeteSim scores. Neurocomputing 2019. [DOI: 10.1016/j.neucom.2018.09.054] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Mojibi P, Tafvizi F, Bikhof Torbati M. Cell-bound Exopolysaccharide Extract from Indigenous Probiotic Bacteria Induce Apoptosis in HT-29 cell-line. IRANIAN JOURNAL OF PATHOLOGY 2018; 14:41-51. [PMID: 31531100 DOI: 10.30699/ijp.14.1.41] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 12/24/2018] [Indexed: 02/02/2023]
Abstract
Background and Objective The aim of this study was to compare the cytotoxiceffects of local probiotic bacteria, including Lactobacillus paracasei, Lactobacillus brevis, while isolated from "Tarkhine" food and the induction of apoptosis in the HT-29 human colon adenocarcinoma cell line and normal fibroblasts. Methods HT-29 and L-929 cell lines were treated with cell-bound exopolysaccharide extract (cb-EPS) from L. paracasei and L. brevis. The MTT assay was used to analyze cell viability. Cellular apoptosis was examined by flow cytometry and DNA fragmentation assay. Results The cb-EPS from both probiotic bacteria prevented the proliferation of HT-29 colon cancer cells. In addi- tion, the cytotoxic and anti-proliferative effects of the exopolysaccharide extract from both bacteria in L-929 fibro- blasts were much lower than HT-29 cells. The induction of apoptosis in HT-29 cells was observed at 48h compared with 72h. It seems that the exopolysaccharides extracted from both bacteria have a greater effect on the induction of apoptosis at 48h. The cb-EPS of L. brevis showed more potent anti-proliferative and apoptotic properties than the cb- EPS of L. paracasei. The ladder pattern of DNA fragmentation confirmed the induction of apoptosis in cancer cells. Conclusion The results of the MTT assay and apoptosis indicate that the induction of apoptosis by the exopolysac- charide from bacteria depends on the dose, time, and strain of bacteria. Further studies may contribute toward the understanding of using these probiotic bacteria as biological products to treat and prevent cancers.
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Affiliation(s)
- Parisa Mojibi
- MSc Student, Dept. of Biology, Parand Branch, Islamic Azad University, Parand, Iran
| | - Farzaneh Tafvizi
- Associate Professor, Dept. of Biology, Parand Branch, Islamic Azad University, Parand, Iran
| | - Maryam Bikhof Torbati
- Assistant Professor, Dept. of Biology, College of science, Yadegar - e- Imam Khomeini (RAH) Shahre-rey Branch, Islamic Azad University, Tehran, Iran
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Abstract
The incidence of colorectal cancer (CRC) is rapidly growing worldwide, and there is therefore a greater emphasis on studies of the treatment or prevention of CRC pathogenesis. Recent studies suggested that consideration of the microbiota is unavoidable to understand inflammation and tumorigenesis in the gastrointestinal tract. We demonstrate, using a mouse model of colitis-associated CRC, that human commensal B. fragilis protects against colon tumorigenesis. The protective role against tumor formation provided by B. fragilis is associated with inhibition of expression of the chemokine receptor CCR5 in the colon. The molecular mechanism for protection against CRC provided by B. fragilis is dependent on polysaccharide A production and is mediated by TLR2 signaling. Our results suggest that the commensal microorganism B. fragilis can be used to prevent inflammation-associated CRC development and may provide an effective therapeutic strategy for CRC. Many patients with chronic inflammation of the gut, such as that observed in inflammatory bowel disease (IBD), develop colorectal cancer (CRC). Recent studies have reported that the development of IBD and CRC partly results from an imbalanced composition of intestinal microbiota and that intestinal inflammation in these diseases can be modulated by the microbiota. The human commensal Bacteroides fragilis is best exemplified playing a protective role against the development of experimental colitis in several animal disease models. In this study, we found that gut inflammation caused by dextran sulfate sodium (DSS) treatment was inhibited by B. fragilis colonization in mice. Further, we reveal a protective role of B. fragilis treatment against colon tumorigenesis using an azoxymethane (AOM)/DSS-induced model of colitis-associated colon cancer in mice and demonstrate that the decreased tumorigenesis by B. fragilis administration is accompanied by inhibited expression of C-C chemokine receptor 5 (CCR5) in the gut. We show direct evidence that the inhibition of tumor formation provided by B. fragilis in colitis-associated CRC animals was dependent on the production of polysaccharide A (PSA) from B. fragilis and that Toll-like receptor 2 (TLR2) signaling was responsible for the protective function of B. fragilis. IMPORTANCE The incidence of colorectal cancer (CRC) is rapidly growing worldwide, and there is therefore a greater emphasis on studies of the treatment or prevention of CRC pathogenesis. Recent studies suggested that consideration of the microbiota is unavoidable to understand inflammation and tumorigenesis in the gastrointestinal tract. We demonstrate, using a mouse model of colitis-associated CRC, that human commensal B. fragilis protects against colon tumorigenesis. The protective role against tumor formation provided by B. fragilis is associated with inhibition of expression of the chemokine receptor CCR5 in the colon. The molecular mechanism for protection against CRC provided by B. fragilis is dependent on polysaccharide A production and is mediated by TLR2 signaling. Our results suggest that the commensal microorganism B. fragilis can be used to prevent inflammation-associated CRC development and may provide an effective therapeutic strategy for CRC.
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Killed Bifidobacterium longum enhanced stress tolerance and prolonged life span of Caenorhabditis elegans via DAF-16. Br J Nutr 2018; 120:872-880. [PMID: 30178731 DOI: 10.1017/s0007114518001563] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Probiotics are bacteria among the intestinal flora that are beneficial for human health. Bifidobacterium longum (BL) is a prototypical probiotic that is widely used in yogurt making, supplements and others. Although various physiological effects of BL have been reported, those associated with longevity and anti-ageing still remain elusive. Here we aimed to elucidate the physiological effects of killed BL (BR-108) on stress tolerance and longevity of Caenorhabditis elegans and their mechanisms. Worms fed killed BL in addition to Escherichia coli (OP50) displayed reduced body length in a BL dose-dependent manner. When compared with those fed E. coli alone, these worms had a higher survival rate following heat stress at 35°C and hydrogen peroxide-induced oxidative stress. A general decrease in motility was observed over time in all worms; however, killed BL-fed ageing worms displayed increased movement and longer life span than those fed E. coli alone. However, the longevity effect was suppressed in sir-2.1, daf-16 and skn-1-deficient worms. Killed BL induced DAF-16 nuclear localisation and increased the expression of the DAF-16 target gene hsp-12.6. These results revealed that the physiological effects of killed BL in C. elegans were mediated by DAF-16 activation. These findings contradict previous observations with different Bifidobacterium and Lactobacillus strains, which showed the role for SKN-1 independently of DAF-16.
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Dai Z, Wong SH, Yu J, Wei Y. Batch effects correction for microbiome data with Dirichlet-multinomial regression. Bioinformatics 2018; 35:807-814. [DOI: 10.1093/bioinformatics/bty729] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Revised: 08/06/2018] [Accepted: 08/22/2018] [Indexed: 01/28/2023] Open
Affiliation(s)
- Zhenwei Dai
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Hong Kong
- Gastrointestinal Cancer Biology & Therapeutics Laboratory, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Sunny H Wong
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Hong Kong
- Gastrointestinal Cancer Biology & Therapeutics Laboratory, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Jun Yu
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key Laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Hong Kong
- Gastrointestinal Cancer Biology & Therapeutics Laboratory, CUHK Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Yingying Wei
- Department of Statistics, The Chinese University of Hong Kong, Hong Kong
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Kho ZY, Lal SK. The Human Gut Microbiome - A Potential Controller of Wellness and Disease. Front Microbiol 2018; 9:1835. [PMID: 30154767 PMCID: PMC6102370 DOI: 10.3389/fmicb.2018.01835] [Citation(s) in RCA: 521] [Impact Index Per Article: 86.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 07/23/2018] [Indexed: 12/12/2022] Open
Abstract
Interest toward the human microbiome, particularly gut microbiome has flourished in recent decades owing to the rapidly advancing sequence-based screening and humanized gnotobiotic model in interrogating the dynamic operations of commensal microbiota. Although this field is still at a very preliminary stage, whereby the functional properties of the complex gut microbiome remain less understood, several promising findings have been documented and exhibit great potential toward revolutionizing disease etiology and medical treatments. In this review, the interactions between gut microbiota and the host have been focused on, to provide an overview of the role of gut microbiota and their unique metabolites in conferring host protection against invading pathogen, regulation of diverse host physiological functions including metabolism, development and homeostasis of immunity and the nervous system. We elaborate on how gut microbial imbalance (dysbiosis) may lead to dysfunction of host machineries, thereby contributing to pathogenesis and/or progression toward a broad spectrum of diseases. Some of the most notable diseases namely Clostridium difficile infection (infectious disease), inflammatory bowel disease (intestinal immune-mediated disease), celiac disease (multisystemic autoimmune disorder), obesity (metabolic disease), colorectal cancer, and autism spectrum disorder (neuropsychiatric disorder) have been discussed and delineated along with recent findings. Novel therapies derived from microbiome studies such as fecal microbiota transplantation, probiotic and prebiotics to target associated diseases have been reviewed to introduce the idea of how certain disease symptoms can be ameliorated through dysbiosis correction, thus revealing a new scientific approach toward disease treatment. Toward the end of this review, several research gaps and limitations have been described along with suggested future studies to overcome the current research lacunae. Despite the ongoing debate on whether gut microbiome plays a role in the above-mentioned diseases, we have in this review, gathered evidence showing a potentially far more complex link beyond the unidirectional cause-and-effect relationship between them.
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Affiliation(s)
- Zhi Y Kho
- School of Science, Tropical Medicine and Biology Platform, Monash University, Subang Jaya, Malaysia
| | - Sunil K Lal
- School of Science, Tropical Medicine and Biology Platform, Monash University, Subang Jaya, Malaysia
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Thøgersen R, Castro-Mejía JL, Sundekilde UK, Hansen LH, Hansen AK, Nielsen DS, Bertram HC. Ingestion of an Inulin-Enriched Pork Sausage Product Positively Modulates the Gut Microbiome and Metabolome of Healthy Rats. Mol Nutr Food Res 2018; 62:e1800608. [PMID: 30004630 DOI: 10.1002/mnfr.201800608] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 06/22/2018] [Indexed: 01/10/2023]
Abstract
SCOPE Processed meat intake is associated with a potential increased colorectal cancer (CRC) risk. In contrast, dietary fiber consumption has been found to lower CRC risk, possibly via mechanisms involving the gut microbiota (GM) and its metabolites. This study investigates the effect of inulin enrichment of a common pork sausage product on GM composition and activity in healthy rats. METHODS AND RESULTS Thirty Sprague-Dawley rats are fed a diet based on either an inulin-enriched sausage (n = 12), a corresponding control sausage without enrichment (n = 12), or a standard chow diet (n = 6) during a 4 week intervention. NMR-based metabolomics analyses are conducted on fecal and plasma samples, and GM composition is determined using 16S rRNA gene amplicon sequencing. Pronounced effects of diets on GM composition and activity are found. Rats fed the inulin-enriched sausages have increased levels of short chain fatty acids (SCFAs) in the fecal and plasma metabolome and increased fecal levels of Bifidobacterium spp. as compared to rats fed sausages without enrichment. CONCLUSION Inulin enrichment of a meat product resembles general effects seen upon dietary fiber consumption and corroborates that healthier processed meats can be developed through strategic inclusion of dietary fiber ingredients.
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Affiliation(s)
- Rebekka Thøgersen
- Department of Food Science, Aarhus University, Kirstinebjergvej 10, 5792, Aarslev, Denmark
| | - Josué L Castro-Mejía
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
| | | | - Lars H Hansen
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000, Roskilde, Denmark
| | - Axel Kornerup Hansen
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Thorvaldsensvej 57, 1871, Frederiksberg C, Denmark
| | - Dennis Sandris Nielsen
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
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Sittipo P, Lobionda S, Choi K, Sari IN, Kwon HY, Lee YK. Toll-Like Receptor 2-Mediated Suppression of Colorectal Cancer Pathogenesis by Polysaccharide A From Bacteroides fragilis. Front Microbiol 2018; 9:1588. [PMID: 30065713 PMCID: PMC6056687 DOI: 10.3389/fmicb.2018.01588] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 06/26/2018] [Indexed: 12/24/2022] Open
Abstract
The beneficial role of gut microbiota in intestinal diseases has been highlighted recently. Bacteroides fragilis found in the human gastrointestinal tract is a well-studied example of a beneficial bacterium that protects against intestinal inflammation. Polysaccharide A (PSA) from B. fragilis induces the production of interleukin (IL)-10 from immune cells via Toll-like receptor 2 (TLR2) signaling in animal colitis models. The direct effect of PSA on human colorectal cancer (CRC) cells has not been studied. Here, we report the effect of PSA from B. fragilis on CRC pathogenesis in SW620 and HT29 CRC cells and the molecular signaling underlying these effects. We demonstrated that PSA induced the production of the pro-inflammatory cytokine, IL-8, but not IL-10, in CRC cells. PSA inhibited CRC cell proliferation by controlling the cell cycle and impaired CRC cell migration and invasion by suppressing epithelial mesenchymal transition. Moreover, as in the case of other animal intestinal diseases, the protective role of PSA against CRC pathogenesis was also mediated by TLR2. Our results reveal that PSA from B. fragilis plays a protective role against CRC via TLR2 signaling.
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Affiliation(s)
| | | | | | | | - Hyog Young Kwon
- Soonchunhyang Institute of Medi-Bio Science, Soonchunhyang University, Cheonan, South Korea
| | - Yun Kyung Lee
- Soonchunhyang Institute of Medi-Bio Science, Soonchunhyang University, Cheonan, South Korea
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Wei H, Chen L, Lian G, Yang J, Li F, Zou Y, Lu F, Yin Y. Antitumor mechanisms of bifidobacteria. Oncol Lett 2018; 16:3-8. [PMID: 29963126 DOI: 10.3892/ol.2018.8692] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 01/05/2018] [Indexed: 12/27/2022] Open
Abstract
Cancer remains one of the most common causes of mortality globally. Chemotherapy, one of the major treatment strategies for cancer, primarily functions by targeting the cancer cells and affecting them physiologically, but also affects normal cells, which is a major concern at present. Therefore, adverse effects of chemotherapy drugs, including myelosuppression and liver and kidney damage, are of concern. Now, microbial products have attracted attention in cancer treatment research. Notably, carcinogenesis is considered to be associated with microbial dysbiosis, particularly the positive antitumor effects of bifidobacteria. Although there remains a substantial amount to be understood about the regulation of bifidobacteria, bifidobacteria remain an attractive and novel source of cancer therapeutics. The present review focuses on introducing the latest information on the antitumor effects of bifidobacteria and to propose future strategies for using bifidobacteria in the development of cancer therapeutics.
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Affiliation(s)
- Hongyun Wei
- Department of Gastroenterology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, P.R. China
| | - Linlin Chen
- Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Guanghui Lian
- Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Junwen Yang
- Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Fujun Li
- Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Yiyou Zou
- Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Fanggen Lu
- Department of Gastroenterology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, P.R. China
| | - Yani Yin
- Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
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Abstract
Recently, several lines of evidence that indicate a strong link between the development of colorectal cancer (CRC) and aspects of the gut microbiota have become apparent. However, it remains unclear how changes in the gut microbiota might influence carcinogenesis or how regional organization of the gut might influence the microbiota. In this review, we discuss several leading theories that connect gut microbial dysbiosis with CRC and set this against a backdrop of what is known about proximal-distal gut physiology and the pathways of CRC development and progression. Finally, we discuss the potential for gut microbial modulation therapies, for example, probiotics, antibiotics, and others, to target and improve gut microbial dysbiosis as a strategy for the prevention or treatment of CRC.
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Miyamoto S, Komiya M, Fujii G, Hamoya T, Nakanishi R, Fujimoto K, Tamura S, Kurokawa Y, Takahashi M, Ijichi T, Mutoh M. Preventive Effects of Heat-Killed Enterococcus faecalis Strain EC-12 on Mouse Intestinal Tumor Development. Int J Mol Sci 2017; 18:ijms18040826. [PMID: 28406434 PMCID: PMC5412410 DOI: 10.3390/ijms18040826] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 04/07/2017] [Accepted: 04/09/2017] [Indexed: 12/21/2022] Open
Abstract
Establishing effective methods for preventing colorectal cancer by so-called “functional foods” is important because the global burden of colorectal cancer is increasing. Enterococcus faecalis strain EC-12 (EC-12), which belongs to the family of lactic acid bacteria, has been shown to exert pleiotropic effects, such as anti-allergy and anti-infectious effects, on mammalian cells. In the present study, we aimed to evaluate the preventive effects of heat-killed EC-12 on intestinal carcinogenesis. We fed 5-week-old male and female Apc mutant Min mice diets containing 50 or 100 ppm heat-killed EC-12 for 8 weeks. In the 50 ppm treated group, there was 4.3% decrease in the number of polyps in males vs. 30.9% in females, and significant reduction was only achieved in the proximal small intestine of female mice. A similar reduction was observed in the 100 ppm treated group. Moreover, heat-killed EC-12 tended to reduce the levels of c-Myc and cyclin D1 mRNA expression in intestinal polyps. Next, we confirmed that heat-killed EC-12 suppressed the transcriptional activity of the T-cell factor/lymphoid enhancer factor, a transcriptional factor involved in cyclin D1 mRNA expression in intestinal polyps. Our results suggest that heat-killed EC-12 very weakly suppresses intestinal polyp development in Min mice, in part by attenuating β-catenin signaling, and this implies that heat-killed EC-12 could be used as a “functional food”.
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Affiliation(s)
- Shingo Miyamoto
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
| | - Masami Komiya
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
| | - Gen Fujii
- Division of Carcinogenesis and Cancer Prevention, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
| | - Takahiro Hamoya
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
| | - Ruri Nakanishi
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
| | - Kyoko Fujimoto
- Division of Molecular Biology, Nagasaki International University, 2825-7 Huis Ten Bosch, Sasebo, Nagasaki 859-3298, Japan.
| | - Shuya Tamura
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
| | - Yurie Kurokawa
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
| | - Maiko Takahashi
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
| | - Tetsuo Ijichi
- Combi Corporation, Functional Foods Division, 5-2-39, Nishibori, Sakura-ku, Saitama-shi, Saitama 338-0832, Japan.
| | - Michihiro Mutoh
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
- Division of Carcinogenesis and Cancer Prevention, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
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Mondal KC, Ray M, Ghosh K, Har PK, Singh SN. Fortification of Rice Gruel into Functional Beverage and Establishment as a Carrier of Newly Isolated Bifidobacterium sp. MKK4. ACTA ACUST UNITED AC 2017. [DOI: 10.3923/jm.2017.102.117] [Citation(s) in RCA: 5] [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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Anaerobic Probiotics: The Key Microbes for Human Health. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2017; 156:397-431. [PMID: 26907552 DOI: 10.1007/10_2015_5008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Human gastrointestinal microbiota (HGIM) incorporate a large number of microbes from different species. Anaerobic bacteria are the dominant organisms in this microbial consortium and play a crucial role in human health. In addition to their functional role as the main source of many essential metabolites for human health, they are considered as biotherapeutic agents in the regulation of different human metabolites. They are also important in the prevention and in the treatment of different physical and mental diseases. Bifidobacteria are the dominant anaerobic bacteria in HGIM and are widely used in the development of probiotic products for infants, children and adults. To develop bifidobacteria-based bioproducts, therefore, it is necessary to develop a large-scale biomass production platform based on a good understanding of the ideal medium and bioprocessing parameters for their growth and viability. In addition, high cell viability should be maintained during downstream processing and storage of probiotic cell powder or the final formulated product. In this work we review the latest information about the biology, therapeutic activities, cultivation and industrial production of bifidobacteria.
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Yan S, Zhao G, Liu X, Zhao J, Zhang H, Chen W. Production of exopolysaccharide by Bifidobacterium longum isolated from elderly and infant feces and analysis of priming glycosyltransferase genes. RSC Adv 2017. [DOI: 10.1039/c7ra03925e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Elder-originatedBifidobacterium longumstrains produced more cell-surface-bound exopolysaccharide (EPS-b) than infant-originated strains.
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Affiliation(s)
- Shuang Yan
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- P. R. China
| | - Guozhong Zhao
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- P. R. China
| | - Xiaoming Liu
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- P. R. China
| | - Jianxin Zhao
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- P. R. China
| | - Hao Zhang
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- P. R. China
| | - Wei Chen
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- P. R. China
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Dos Reis SA, da Conceição LL, Siqueira NP, Rosa DD, da Silva LL, Peluzio MDCG. Review of the mechanisms of probiotic actions in the prevention of colorectal cancer. Nutr Res 2016; 37:1-19. [PMID: 28215310 DOI: 10.1016/j.nutres.2016.11.009] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 11/16/2016] [Accepted: 11/18/2016] [Indexed: 12/16/2022]
Abstract
The purpose of this review is to discuss the potential mechanisms of probiotics action in colorectal cancer prevention. In this regard, the composition of the intestinal microbiota is considered as an important risk factor in the development of colorectal cancer, and probiotics are able to positively modulate the composition of this microbiota. Studies have shown that the regular consumption of probiotics could prevent the development of colorectal cancer. In this respect, in vitro and experimental studies suggest some potential mechanisms responsible for this anticarcinogenic action. The mechanisms include modification of the intestinal microbiota composition, changes in metabolic activity of the microbiota, binding and degradation of carcinogenic compounds present in the intestinal lumen, production of compounds with anticarcinogenic activity, immunomodulation, improvement of the intestinal barrier, changes in host physiology, inhibition of cell proliferation, and induction of apoptosis in cancer cells. In contrast, very few reports demonstrate adverse effects of probiotic oral supplementation. In light of the present evidence, more specific studies are needed on probiotic bacteria, especially regarding the identification of the bacterial strains with greater anticarcinogenic potential; the verification of the viability of these strains after passing through the gastrointestinal tract; the investigation of potential adverse effects in immunocompromised individuals; and finally establishing the dosage and frequency of use.
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Affiliation(s)
- Sandra A Dos Reis
- Department of Nutrition and Health, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil.
| | - Lisiane L da Conceição
- Department of Nutrition and Health, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil.
| | - Nathane P Siqueira
- Department of Nutrition and Health, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil.
| | - Damiana D Rosa
- Department of Nutrition and Health, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil.
| | - Letícia L da Silva
- Department of Nutrition and Health, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil.
| | - Maria do Carmo G Peluzio
- Department of Nutrition and Health, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil.
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Structural Change in Microbiota by a Probiotic Cocktail Enhances the Gut Barrier and Reduces Cancer via TLR2 Signaling in a Rat Model of Colon Cancer. Dig Dis Sci 2016; 61:2908-2920. [PMID: 27384052 DOI: 10.1007/s10620-016-4238-7] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Accepted: 06/21/2016] [Indexed: 12/16/2022]
Abstract
BACKGROUND Structural change in the gut microbiota is implicated in cancer. The beneficial modulation of the microbiota composition with probiotics and prebiotics prevents diseases. AIM We investigated the effect of oligofructose-maltodextrin-enriched Lactobacillus acidophilus, Bifidobacteria bifidum, and Bifidobacteria infantum (LBB), on the gut microbiota composition and progression of colorectal cancer. METHODS Sprague Dawley rats were acclimatized, given ampicillin (75 mg/kg), and treated as follows; GCO: normal control; GPR: LBB only; GPC: LBB+ 1,2-dimethylhydrazine dihydrochloride (DMH); and GCA: DMH only (cancer control). 16S V4 Pyrosequencing for gut microbiota analysis, tumor studies, and the expression of MUC2, ZO-1, occludin, TLR2, TLR4, caspase 3, COX-2, and β-catenin were conducted at the end of experiment. RESULTS Probiotic LBB treatment altered the gut microbiota. The relative abundance of genera Pseudomonas, Congregibacter, Clostridium, Candidactus spp., Phaeobacter, Escherichia, Helicobacter, and HTCC was decreased (P < 0.05), but the genus Lactobacillus increased (P < 0.05), in LBB treatment than in cancer control. The altered gut microbiota was associated with decreased tumor incidence (80 % in GPC vs. 100 % in GCA, P = 0.0001), tumor volume (GPC 84.23 (42.75-188.4) mm(3) vs. GCA 243 (175.5-344.5) mm(3), P < 0.0001) and tumor multiplicity/count (GPC 2.92 ± 0.26 vs. GCA 6.27 ± 0.41; P < 0.0001). The expression of MUC2, ZO-1, occludin, and TLR2 was increased, but expression of TLR4, caspase 3, Cox-2, and β-catenin was decreased by LBB treatment than in cancer control GCA (P < 0.05). CONCLUSION Administration of LBB modulates the gut microbiota and reduces colon cancer development by decreasing tumor incidence, multiplicity/count, and volume via enhanced TLR2-improved gut mucosa epithelial barrier integrity and suppression of apoptosis and inflammation.
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Górska S, Dylus E, Rudawska A, Brzozowska E, Srutkova D, Schwarzer M, Razim A, Kozakova H, Gamian A. Immunoreactive Proteins of Bifidobacterium longum ssp. longum CCM 7952 and Bifidobacterium longum ssp. longum CCDM 372 Identified by Gnotobiotic Mono-Colonized Mice Sera, Immune Rabbit Sera and Non-immune Human Sera. Front Microbiol 2016; 7:1537. [PMID: 27746766 PMCID: PMC5040718 DOI: 10.3389/fmicb.2016.01537] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 09/14/2016] [Indexed: 12/23/2022] Open
Abstract
The Bifidobacteria show great diversity in the cell surface architecture which may influence the physicochemical properties of the bacterial cell and strain specific properties. The immunomodulatory role of bifidobacteria has been extensively studied, however studies on the immunoreactivity of their protein molecules are very limited. Here, we compared six different methods of protein isolation and purification and we report identification of immunogenic and immunoreactive protein of two human Bifidobacterium longum ssp. longum strains. We evaluated potential immunoreactive properties of proteins employing polyclonal sera obtained from germ free mouse, rabbit and human. The protein yield was isolation method-dependent and the reactivity of proteins detected by SDS-PAGE and Western blotting was heterogeneous and varied between different serum samples. The proteins with the highest immunoreactivity were isolated, purified and have them sequenced. Among the immunoreactive proteins we identified enolase, aspartokinase, pyruvate kinase, DnaK (B. longum ssp. longum CCM 7952) and sugar ABC transporter ATP-binding protein, phosphoglycerate kinase, peptidoglycan synthethase penicillin-binding protein 3, transaldolase, ribosomal proteins and glyceraldehyde 3-phosphate dehydrogenase (B. longum ssp. longum CCDM 372).
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Affiliation(s)
- Sabina Górska
- Department of Medical Microbiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy of the Polish Academy of Sciences Wroclaw, Poland
| | - Ewa Dylus
- Department of Medical Microbiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy of the Polish Academy of Sciences Wroclaw, Poland
| | - Angelika Rudawska
- Department of Medical Microbiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy of the Polish Academy of Sciences Wroclaw, Poland
| | - Ewa Brzozowska
- Department of Medical Microbiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy of the Polish Academy of Sciences Wroclaw, Poland
| | - Dagmar Srutkova
- Laboratory of Gnotobiology, Institute of Microbiology, Academy of Sciences of the Czech Republic v. v. i., Novy Hradek, Czech Republic
| | - Martin Schwarzer
- Laboratory of Gnotobiology, Institute of Microbiology, Academy of Sciences of the Czech Republic v. v. i., Novy Hradek, Czech Republic
| | - Agnieszka Razim
- Department of Medical Microbiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy of the Polish Academy of Sciences Wroclaw, Poland
| | - Hana Kozakova
- Laboratory of Gnotobiology, Institute of Microbiology, Academy of Sciences of the Czech Republic v. v. i., Novy Hradek, Czech Republic
| | - Andrzej Gamian
- Department of Medical Microbiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy of the Polish Academy of Sciences Wroclaw, Poland
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Wu J, Zhu J, Yin H, Liu X, An M, Pudlo NA, Martens EC, Chen GY, Lubman DM. Development of an Integrated Pipeline for Profiling Microbial Proteins from Mouse Fecal Samples by LC-MS/MS. J Proteome Res 2016; 15:3635-3642. [PMID: 27559751 DOI: 10.1021/acs.jproteome.6b00450] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Metaproteomics is one approach to analyze the functional capacity of the gut microbiome but is limited by the ability to evenly extract proteins from diverse organisms within the gut. Herein, we have developed a pipeline to optimize sample preparation of stool obtained from germ-free (GF) mice that were gavaged a defined community of 11 bacterial strains isolated from the human gut. With 64% more proteins identified, bead-beating was confirmed to be an indispensable step for the extraction of bacterial proteins, especially for Gram-positive bacteria. Bacterial enrichment from mouse fecal samples was further optimized by evaluating three different methods: (1) a high-speed differential centrifugation (HCE) or (2) a low-speed differential centrifugation (LCE) and (3) a filter-aided method (FA). The HCE method was associated with dramatic loss of bacteria and 71% less recovery of bacterial proteins than the LCE method. Compared with LCE, the FA method also showed dramatic loss of the amount of bacteria recovered and decreased protein identifications from Gram-positive bacteria in the stool samples. Ultimately, LCE may provide an alternative and complementary method for enriching bacteria from small amounts of mouse fecal samples, which could aid in investigating bacterial function in health and disease.
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Affiliation(s)
- Jing Wu
- Department of Surgery, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Jianhui Zhu
- Department of Surgery, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Haidi Yin
- Department of Surgery, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Xinhua Liu
- Department of Surgery, University of Michigan , Ann Arbor, Michigan 48109, United States.,Experiment Center for Science and Technology, Shanghai University of Traditional Chinese Medicine , Shanghai 201203, China
| | - Mingrui An
- Department of Surgery, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Nicholas A Pudlo
- Department of Microbiology and Immunology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Eric C Martens
- Department of Microbiology and Immunology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Grace Y Chen
- Division of Hematology/Oncology, Department of Internal Medicine, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - David M Lubman
- Department of Surgery, University of Michigan , Ann Arbor, Michigan 48109, United States
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Liu W, Crott JW, Lyu L, Pfalzer AC, Li J, Choi SW, Yang Y, Mason JB, Liu Z. Diet- and Genetically-induced Obesity Produces Alterations in the Microbiome, Inflammation and Wnt Pathway in the Intestine of Apc +/1638N Mice: Comparisons and Contrasts. J Cancer 2016; 7:1780-1790. [PMID: 27698916 PMCID: PMC5039360 DOI: 10.7150/jca.15792] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Accepted: 06/29/2016] [Indexed: 02/07/2023] Open
Abstract
Obesity is an established risk factor for colorectal cancer (CRC). Our previous study indicated that obesity increases activity of the pro-tumorigenic Wnt-signaling. Presently, we sought to further advance our understanding of the mechanisms by which obesity promotes CRC by examining associations between microbiome, inflammation and Wnt-signaling in Apc+/1638N mice whose obesity was induced by one of two modalities, diet- or genetically-induced obesity. Three groups were employed: Apc+/1638NLepr+/+ fed a low fat diet (10% fat), Apc+/1638NLepr+/+ fed a high fat diet (60% fat, diet-induced obesity), and Apc+/1638NLeprdb/db fed a low fat diet (genetically-induced obesity). All animals received diets for 16 weeks from 8 to 24 weeks of age. The abundance of 19 bowel cancer-associated bacterial taxa were examined by real-time PCR. The abundance of Turicibacter and Desulfovibrio decreased, but F. prausnitizii increased, in diet-induced obese mice (p < 0.05). In contrast, in genetically-induced obese mice, Bifidobacterium, A. muciniphila and E. rectale decreased, but Peptostrptococcus, and E. coli increased (p < 0.05). Both diet- and genetically-induced obesity altered the expression of genes involved in bacterial recognition (MyD88) and increased inflammation as indicated by elevated levels of cytokines (IFNγ and TNF-α for genetically-induced obesity, and IL-6 for diet-induced obesity). The elevated inflammation was associated with altered expression of genes that are integral components of the Wnt-signaling cascade in a fashion indicating its activation. These findings demonstrate that the composition of the small intestinal microbiome is affected differently in diet- and genetically-induced obesity, but both are associated with elevated intestinal inflammation and alterations of the Wnt pathway towards enhancing tumorigenesis.
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Affiliation(s)
- Wei Liu
- Nutrition and Cancer Prevention Laboratory, School of Public Health and Health Sciences, University of Massachusetts, Amherst, USA
- Institute of Food Science and Technology, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Jimmy W. Crott
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, USA
| | - Lin Lyu
- Nutrition and Cancer Prevention Laboratory, School of Public Health and Health Sciences, University of Massachusetts, Amherst, USA
| | - Anna C. Pfalzer
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, USA
| | - Jinchao Li
- Nutrition and Cancer Prevention Laboratory, School of Public Health and Health Sciences, University of Massachusetts, Amherst, USA
| | - Sang-Woon Choi
- Nutrition and Cancer Prevention Laboratory, School of Public Health and Health Sciences, University of Massachusetts, Amherst, USA
- CHA Cancer Research Center, CHA University, Seoul, Korea
| | - Yingke Yang
- Department of Molecular Medicine, Hunan University, Changsha, China
| | - Joel B. Mason
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, USA
- Tufts Medical Center Cancer Center, Tufts University, Boston, USA
| | - Zhenhua Liu
- Nutrition and Cancer Prevention Laboratory, School of Public Health and Health Sciences, University of Massachusetts, Amherst, USA
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, USA
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Plasmonic-based colorimetric and spectroscopic discrimination of acetic and butyric acids produced by different types of Escherichia coli through the different assembly structures formation of gold nanoparticles. Anal Chim Acta 2016; 933:196-206. [DOI: 10.1016/j.aca.2016.05.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 05/18/2016] [Accepted: 05/24/2016] [Indexed: 11/23/2022]
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Ávila-Fernández Á, Cuevas-Juárez E, Rodríguez-Alegría M, Olvera C, López-Munguía A. Functional characterization of a novel β-fructofuranosidase from Bifidobacterium longum
subsp. infantis
ATCC 15697 on structurally diverse fructans. J Appl Microbiol 2016; 121:263-76. [DOI: 10.1111/jam.13154] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 03/25/2016] [Accepted: 04/11/2016] [Indexed: 01/06/2023]
Affiliation(s)
- Á. Ávila-Fernández
- Centro de Investigación; DACS-Universidad Juárez Autónoma de Tabasco; Tabasco México
| | - E. Cuevas-Juárez
- Instituto de Biotecnología; Universidad Nacional Autónoma de México; Cuernavaca Morelos México
| | - M.E. Rodríguez-Alegría
- Instituto de Biotecnología; Universidad Nacional Autónoma de México; Cuernavaca Morelos México
| | - C. Olvera
- Instituto de Biotecnología; Universidad Nacional Autónoma de México; Cuernavaca Morelos México
| | - A. López-Munguía
- Instituto de Biotecnología; Universidad Nacional Autónoma de México; Cuernavaca Morelos México
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Di Cerbo A, Palmieri B, Aponte M, Morales-Medina JC, Iannitti T. Mechanisms and therapeutic effectiveness of lactobacilli. J Clin Pathol 2015; 69:187-203. [PMID: 26578541 PMCID: PMC4789713 DOI: 10.1136/jclinpath-2015-202976] [Citation(s) in RCA: 153] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 09/14/2015] [Indexed: 12/11/2022]
Abstract
The gut microbiome is not a silent ecosystem but exerts several physiological and immunological functions. For many decades, lactobacilli have been used as an effective therapy for treatment of several pathological conditions displaying an overall positive safety profile. This review summarises the mechanisms and clinical evidence supporting therapeutic efficacy of lactobacilli. We searched Pubmed/Medline using the keyword ‘Lactobacillus’. Selected papers from 1950 to 2015 were chosen on the basis of their content. Relevant clinical and experimental articles using lactobacilli as therapeutic agents have been included. Applications of lactobacilli include kidney support for renal insufficiency, pancreas health, management of metabolic imbalance, and cancer treatment and prevention. In vitro and in vivo investigations have shown that prolonged lactobacilli administration induces qualitative and quantitative modifications in the human gastrointestinal microbial ecosystem with encouraging perspectives in counteracting pathology-associated physiological and immunological changes. Few studies have highlighted the risk of translocation with subsequent sepsis and bacteraemia following probiotic administration but there is still a lack of investigations on the dose effect of these compounds. Great care is thus required in the choice of the proper Lactobacillus species, their genetic stability and the translocation risk, mainly related to inflammatory disease-induced gut mucosa enhanced permeability. Finally, we need to determine the adequate amount of bacteria to be delivered in order to achieve the best clinical efficacy decreasing the risk of side effects.
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Affiliation(s)
- Alessandro Di Cerbo
- School of Specialization in Clinical Biochemistry, "G. d'Annunzio" University, Chieti, Italy
| | - Beniamino Palmieri
- Department of General Surgery and Surgical Specialties, University of Modena and Reggio Emilia Medical School, Surgical Clinic, Modena, Italy
| | - Maria Aponte
- Department of Agriculture, University of Naples "Federico II", Portici, Naples, Italy
| | - Julio Cesar Morales-Medina
- Centro de Investigación en Reproducción Animal, CINVESTAV- Universidad Autónoma de Tlaxcala, Tlaxcala, México
| | - Tommaso Iannitti
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience (SITraN), University of Sheffield, Sheffield, UK
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The potential for fungal biopesticides to reduce malaria transmission under diverse environmental conditions. Curr Nutr Rep 2015. [PMID: 26792946 DOI: 10.1007/s13668-012-0032-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The effectiveness of conventional malaria vector control is being threatened by the spread of insecticide resistance. One promising alternative to chemicals is the use of naturally-occurring insect-killing fungi. Numerous laboratory studies have shown that isolates of fungal pathogens such as Beauveria bassiana can infect and kill adult mosquitoes, including those resistant to chemical insecticides.Unlike chemical insecticides, fungi may take up to a week or more to kill mosquitoes following exposure. This slow kill speed can still reduce malaria transmission because the malaria parasite itself takes at least eight days to complete its development within the mosquito. However, both fungal virulence and parasite development rate are strongly temperature-dependent, so it is possible that biopesticide efficacy could vary across different transmission environments.We examined the virulence of a candidate fungal isolate against two key malaria vectors at temperatures from 10-34 °C. Regardless of temperature, the fungus killed more than 90% of exposed mosquitoes within the predicted duration of the malarial extrinsic incubation period, a result that was robust to realistic diurnal temperature variation.We then incorporated temperature sensitivities of a suite of mosquito, parasite and fungus life-history traits that are important determinants of malaria transmission into a stage-structured malaria transmission model. The model predicted that, at achievable daily fungal infection rates, fungal biopesticides have the potential to deliver substantial reductions in the density of malaria-infectious mosquitoes across all temperatures representative of malaria transmission environments.Synthesis and applications. Our study combines empirical data and theoretical modelling to prospectively evaluate the potential of fungal biopesticides to control adult malaria vectors. Our results suggest that Beauveria bassiana could be a potent tool for malaria control and support further development of fungal biopesticides to manage infectious disease vectors.
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Ghoneum M, Felo N. Selective induction of apoptosis in human gastric cancer cells by Lactobacillus kefiri (PFT), a novel kefir product. Oncol Rep 2015; 34:1659-66. [PMID: 26251956 PMCID: PMC4564078 DOI: 10.3892/or.2015.4180] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 07/10/2015] [Indexed: 12/28/2022] Open
Abstract
The present study was undertaken to evaluate the effect of Lactobacillus kefiri (PFT), a novel kefir product, on apoptosis of gastric cancer cells (AGS), breast cancer cells (4T1), and human peripheral blood mononuclear cells (PBMCs). Cells were cultured with PFT and apoptosis was determined by flow cytometry using 7-AAD dye and cytospin preparation. Mitochondrial dysfunction and expression of Bcl2 were monitored by flow cytometry. Results showed that PFT induced apoptosis in AGS gastric cancer cells in a dose-dependent manner. Apoptosis was detected at a concentration of 0.3 mg/ml (20.8%), increased to 25.8% at 0.6 mg/ml, 37% at 1.2 mg/ml, 53.1% at 2.5 mg/ml, and peaked at 66.3% at 5.0 mg/ml. Apoptosis is associated with the decreased polarization of mitochondrial membrane potential (MMP) and decreased Bcl2 expression. PFT-treated AGS cells manifested membrane blebbing, nuclear condensation, and fragmentation as identified in cytospin cytocentrifuge Giemsa stained preparations. On the other hand, flow cytometry analysis showed that PFT did not induce apoptosis in 4T1 breast cancer cells nor in PBMCs. These results suggest that PFT is safe for white blood cells and selectively induces apoptotic effects in gastric cancer cells. Hence, it may have potential as a therapeutic agent for the treatment of gastric cancers.
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Affiliation(s)
- Mamdooh Ghoneum
- Department of Otolaryngology, Charles R. Drew University of Medicine and Science, Los Angeles, CA 90059, USA
| | - Nouran Felo
- Department of Otolaryngology, Charles R. Drew University of Medicine and Science, Los Angeles, CA 90059, USA
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Zhang YJ, Li S, Gan RY, Zhou T, Xu DP, Li HB. Impacts of gut bacteria on human health and diseases. Int J Mol Sci 2015; 16:7493-519. [PMID: 25849657 PMCID: PMC4425030 DOI: 10.3390/ijms16047493] [Citation(s) in RCA: 497] [Impact Index Per Article: 55.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 03/23/2015] [Accepted: 03/26/2015] [Indexed: 02/07/2023] Open
Abstract
Gut bacteria are an important component of the microbiota ecosystem in the human gut, which is colonized by 1014 microbes, ten times more than the human cells. Gut bacteria play an important role in human health, such as supplying essential nutrients, synthesizing vitamin K, aiding in the digestion of cellulose, and promoting angiogenesis and enteric nerve function. However, they can also be potentially harmful due to the change of their composition when the gut ecosystem undergoes abnormal changes in the light of the use of antibiotics, illness, stress, aging, bad dietary habits, and lifestyle. Dysbiosis of the gut bacteria communities can cause many chronic diseases, such as inflammatory bowel disease, obesity, cancer, and autism. This review summarizes and discusses the roles and potential mechanisms of gut bacteria in human health and diseases.
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Affiliation(s)
- Yu-Jie Zhang
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China.
| | - Sha Li
- School of Chinese Medicine, The University of Hong Kong, Sassoon Road, Hong Kong, China.
| | - Ren-You Gan
- School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
| | - Tong Zhou
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China.
| | - Dong-Ping Xu
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China.
| | - Hua-Bin Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China.
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