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Zheng J, Zhang W, Gong Y, Liang W, Leng Y. A novel near-infrared polymethine dye biosensor for rapid and selective detection of lithocholic acid. Biosens Bioelectron 2024; 259:116383. [PMID: 38749286 DOI: 10.1016/j.bios.2024.116383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2024] [Revised: 05/05/2024] [Accepted: 05/11/2024] [Indexed: 06/03/2024]
Abstract
Lithocholic acid (LCA), a secondary bile acid, has emerged as a potential early diagnostic biomarker for various liver diseases. In this study, we introduce a novel near-infrared (NIR) polymethine dye-based biosensor, capable of sensitive and selective detection of LCA in phosphate buffer and artificial urine (AU) solutions. The detection mechanism relies on the formation of J-aggregates resulting from the interplay of 3,3-Diethylthiatricarbocyanine iodide (DiSC2(7)) dye molecules and LCA, which induces a distinctive red shift in both absorption and fluorescence spectra. The biosensor demonstrates a detection limit for LCA of 70 μM in PBS solution (pH 7.4), while in AU solution, it responds to an LCA concentration as low as ∼60 μM. Notably, the proposed biosensor exhibits outstanding selectivity for LCA, effectively distinguishing it from common interferents such as uric acid, ascorbic acid, and glucose. This rapid, straightforward, and cost-effective spectrometer-based method underscores its potential for early diagnosis of liver diseases by monitoring LCA concentrations.
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Affiliation(s)
- Jianlu Zheng
- Institute of Biomedical Engineering, College of Medicine, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China; Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba Meguro-Ku, Tokyo, 153-8505, Japan
| | - Wencui Zhang
- Institute of Biomedical Engineering, College of Medicine, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China; Equipe Chimie des Polymères, Institut Parisien de Chimie Moléculaire (UMR-CNRS 8232), Sorbonne Université, 75252, Paris, France
| | - Yanli Gong
- Institute of Biomedical Engineering, College of Medicine, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China; Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China
| | - Wenlang Liang
- Institute of Biomedical Engineering, College of Medicine, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China; Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China.
| | - Yongxiang Leng
- Institute of Biomedical Engineering, College of Medicine, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China; Key Laboratory of Advanced Technologies of Materials, Ministry of Education and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China
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Dong Z, Shi R, Li P, Song X, Dong F, Zhu J, Wu R, Liang Z, Du M, Wang J, Yang Z. Does postcholecystectomy increase the risk of colorectal cancer? Front Microbiol 2023; 14:1194419. [PMID: 37426004 PMCID: PMC10324655 DOI: 10.3389/fmicb.2023.1194419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 05/31/2023] [Indexed: 07/11/2023] Open
Abstract
With the increasing number of cholecystectomy and the high proportion of colorectal cancer in malignant tumors, the question of whether cholecystectomy is a risk factor for colorectal disease has been widely concerned. After reviewing the literature at home and abroad, the authors will summarize the research progress of the correlation between the occurrence of colorectal tumors after cholecystectomy, in order to provide help for the prevention and treatment of colorectal tumors.
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Affiliation(s)
- Zhenyu Dong
- Department of General Surgery, Baotou Central Hospital, Baotou, Inner Mongolia, China
- Baotou Medical College, Baotou, Inner Mongolia, China
| | - Ruixian Shi
- Department of Neurology, Baotou Central Hospital, Baotou, Inner Mongolia, China
- Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Pengda Li
- Department of General Surgery, Baotou Central Hospital, Baotou, Inner Mongolia, China
- Baotou Medical College, Baotou, Inner Mongolia, China
| | - Xiaobiao Song
- Department of General Surgery, Baotou Central Hospital, Baotou, Inner Mongolia, China
| | - Fan Dong
- Department of General Surgery, Baotou Central Hospital, Baotou, Inner Mongolia, China
| | - Jianmin Zhu
- Department of General Surgery, Baotou Central Hospital, Baotou, Inner Mongolia, China
| | - Riga Wu
- Department of General Surgery, The Second Affiliated Hospital of Baotou Medical College, Baotou, Inner Mongolia, China
| | - Zhi Liang
- Baotou Medical College, Baotou, Inner Mongolia, China
| | - Mingyue Du
- Baotou Medical College, Baotou, Inner Mongolia, China
| | - Jijun Wang
- Department of General Surgery, Baotou Central Hospital, Baotou, Inner Mongolia, China
| | - Zhigang Yang
- Department of Urology, Baotou Central Hospital, Baotou, Inner Mongolia, China
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Alustiza M, Ripoll L, Canals A, Murcia O, Martínez-Roca A, García-Heredia A, Giner-Calabuig M, Jover R, Vidal L. A novel non-invasive colorectal cancer diagnostic method: Volatile organic compounds as biomarkers. Clin Chim Acta 2023; 542:117273. [PMID: 36863694 DOI: 10.1016/j.cca.2023.117273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 02/24/2023] [Accepted: 02/25/2023] [Indexed: 03/04/2023]
Abstract
INTRODUCTION Population-based fecal tests for colorectal cancer (CRC) screening have shown to reduce mortality thanks to the early detection of the disease. However, currently available fecal tests are limited in their sensitivity and specificity. Our aim is to look for volatile organic compounds in fecal samples as biomarkers for CRC detection. MATERIAL AND METHODS Eighty participants were included; 24 had adenocarcinoma, 24 had adenomatous polyps and 32 presented no neoplasms. Fecal samples were collected 48 h preceding the colonoscopy from all participants, except CRC patient samples that were collected after 3-4 weeks from the colonoscopy. Magnetic headspace adsorptive extraction (Mag-HSAE) followed by thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS) was performed on stool samples to identify volatile organic compounds as biomarkers. RESULTS p-Cresol was significantly more abundant in the cancer samples (P < 0.001) with an area under the curve (AUC) of 0.85 (CI 95%; 0.737-0.953), having a sensitivity and specificity of 83% and 82%, respectively. In addition, 3(4H)-dibenzofuranone,4a,9b-dihydro-8,9b-dimethyl- (3(4H)-DBZ) was also more abundant in the cancer samples (P < 0.001) with an AUC of 0.77 (CI 95%; 0.635-0.905), sensitivity of 78% and specificity of 75%. When combined (p-cresol and 3(4H)-DBZ), the AUC was 0.86, sensitivity 87% and specificity 79%. p-Cresol also appeared to be promising as a biomarker for pre-malignant lesions with an AUC of 0.69 (CI 95%; 0.534-0.862), sensitivity 83% and specificity 63%, P = 0.045. CONCLUSIONS Volatile organic compounds emitted from feces and determined by a sensitive analytical methodology (Mag-HSAE-TD-GC-MS), employing a magnetic graphene oxide as extractant phase, could be used as a potential screening technology for CRC and pre-malignant lesions.
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Affiliation(s)
- Miren Alustiza
- Laboratorio de Investigación, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), Alicante, Spain
| | - Laura Ripoll
- Departamento de Química Analítica, Nutrición y Bromatología e Instituto Universitario de Materiales, Universidad de Alicante, P.O. Box 99, 03080 Alicante, Spain
| | - Antonio Canals
- Departamento de Química Analítica, Nutrición y Bromatología e Instituto Universitario de Materiales, Universidad de Alicante, P.O. Box 99, 03080 Alicante, Spain
| | - Oscar Murcia
- Laboratorio de Investigación, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), Alicante, Spain; Servicio de Medicina Digestiva, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), Alicante, Spain
| | - Alejandro Martínez-Roca
- Laboratorio de Investigación, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), Alicante, Spain
| | - Anabel García-Heredia
- Laboratorio de Investigación, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), Alicante, Spain
| | - Mar Giner-Calabuig
- Laboratorio de Investigación, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), Alicante, Spain
| | - Rodrigo Jover
- Laboratorio de Investigación, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), Alicante, Spain; Servicio de Medicina Digestiva, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), Alicante, Spain.
| | - Lorena Vidal
- Laboratorio de Investigación, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), Alicante, Spain; Departamento de Química Analítica, Nutrición y Bromatología e Instituto Universitario de Materiales, Universidad de Alicante, P.O. Box 99, 03080 Alicante, Spain.
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Gorelik O, Rogad A, Holoidovsky L, Meijler MM, Sal-Man N. Indole intercepts the communication between enteropathogenic E. coli and Vibrio cholerae. Gut Microbes 2022; 14:2138677. [PMID: 36519445 PMCID: PMC9635540 DOI: 10.1080/19490976.2022.2138677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Reported numbers of diarrheal samples exhibiting co-infections or multiple infections, with two or more infectious agents, are rising, likely due to advances in bacterial diagnostic techniques. Bacterial species detected in these samples include Vibrio cholerae (V. cholerae) and enteropathogenic Escherichia coli (EPEC), which infect the small intestine and are associated with high mortality rates. It has previously been reported that EPEC exhibit enhanced virulence in the presence of V. cholerae owing to their ability to sense and respond to elevated concentrations of cholera autoinducer 1 (CAI-1), which is the primary quorum-sensing (QS) molecule produced by V. cholerae. In this study, we examined this interspecies bacterial communication in the presence of indole, a major microbiome-derived metabolite found at high concentrations in the human gut. Interestingly, we discovered that although indole did not affect bacterial growth or CAI-1 production, it impaired the ability of EPEC to enhance its virulence activity in response to the presence of V. cholerae. Furthermore, the co-culture of EPEC and V. cholerae in the presence of B. thetaiotaomicron, an indole-producing commensal bacteria, ablated the enhancement of EPEC virulence. Together, these results suggest that microbiome compositions or diets that influence indole gut concentrations may differentially impact the virulence of pathogens and their ability to sense and respond to competing bacteria.
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Affiliation(s)
- Orna Gorelik
- The Shraga Segal Department of Microbiology, Immunology, and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Alona Rogad
- The Shraga Segal Department of Microbiology, Immunology, and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Lara Holoidovsky
- Department of Chemistry, the National Institute for Biotechnology in the Negev Ben-Gurion University of the Negev, Be’er Sheva, Israel
| | - Michael M. Meijler
- Department of Chemistry, the National Institute for Biotechnology in the Negev Ben-Gurion University of the Negev, Be’er Sheva, Israel
| | - Neta Sal-Man
- The Shraga Segal Department of Microbiology, Immunology, and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel,CONTACT Neta Sal-Man The Shraga Segal Department of Microbiology, Immunology, and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Chung S, Kim H, Kim D, Lee JM, Lee CJ, Oh SB. Common bacterial metabolite indole directly activates nociceptive neuron through transient receptor potential ankyrin 1 channel. Pain 2022; 163:1530-1541. [PMID: 34817438 DOI: 10.1097/j.pain.0000000000002542] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 11/15/2021] [Indexed: 11/26/2022]
Abstract
ABSTRACT Nociceptors are known to directly recognize bacterial cell wall components or secreted toxins, thereby leading to pain induced by bacterial infection. However, direct activation of nociceptors by bacterial metabolites remains unclear although bacteria produce numerous metabolites related to health and disease. In this study, we investigated whether and how a common bacterial metabolite, indole, which is produced by normal microflora of the gastrointestinal tract and oral cavity, can directly activate nociceptive sensory neurons. We found that indole elicits calcium response and evokes inward currents in subsets of dorsal root ganglia (DRG) neurons. Intraplantar (i.pl.) injection of indole produced nocifensive behaviors in adult mice, which were enhanced in complete Freund's adjuvant-induced chronic inflammatory condition. Indole increased calcitonin gene-related peptide release in DRG neurons, and i.pl. injection of indole increased hind paw thickness, suggesting its role in generation of neurogenic inflammation. These in vitro and in vivo indole-induced responses were pharmacologically blocked by transient receptor potential ankyrin 1 (TRPA1) antagonist, HC-030031, and significantly abolished in TRPA1 knockout (KO) mice, indicating that indole targets TRPA1 for its action in DRG neurons. Nocifensive licking behavior induced by the injection of live Escherichia coli was significantly decreased in tryptophanase mutant (TnaA KO) E. coli- injected mice that lack indole production, further supporting the idea that bacteria-derived indole can induce pain during infection. Identifying the mechanism of action of indole through TRPA1 provides insights into bacteria-neuron interactions and the role of bacterial metabolites in pain signaling, especially in inflammation-accompanied bacterial infection.
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Affiliation(s)
- Sena Chung
- Department of Brain and Cognitive Sciences, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea
| | - Hayun Kim
- Interdisciplinary Program in Neuroscience, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea
| | - Doyun Kim
- Department of Neurobiology and Physiology, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
| | - Jung Moo Lee
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, Republic of Korea
- Center for Cognition and Sociality, Institute for Basic Science, Daejeon, Republic of Korea
| | - C Justin Lee
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, Republic of Korea
- Center for Cognition and Sociality, Institute for Basic Science, Daejeon, Republic of Korea
| | - Seog Bae Oh
- Department of Brain and Cognitive Sciences, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea
- Interdisciplinary Program in Neuroscience, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea
- Department of Neurobiology and Physiology, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
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Perry EK, Meirelles LA, Newman DK. From the soil to the clinic: the impact of microbial secondary metabolites on antibiotic tolerance and resistance. Nat Rev Microbiol 2022; 20:129-142. [PMID: 34531577 PMCID: PMC8857043 DOI: 10.1038/s41579-021-00620-w] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/02/2021] [Indexed: 02/08/2023]
Abstract
Secondary metabolites profoundly affect microbial physiology, metabolism and stress responses. Increasing evidence suggests that these molecules can modulate microbial susceptibility to commonly used antibiotics; however, secondary metabolites are typically excluded from standard antimicrobial susceptibility assays. This may in part account for why infections by diverse opportunistic bacteria that produce secondary metabolites often exhibit discrepancies between clinical antimicrobial susceptibility testing results and clinical treatment outcomes. In this Review, we explore which types of secondary metabolite alter antimicrobial susceptibility, as well as how and why this phenomenon occurs. We discuss examples of molecules that opportunistic and enteric pathogens either generate themselves or are exposed to from their neighbours, and the nuanced impacts these molecules can have on tolerance and resistance to certain antibiotics.
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Affiliation(s)
- Elena K Perry
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Lucas A Meirelles
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Dianne K Newman
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA.
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA.
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Abstract
Gastrointestinal microbes respond to biochemical metabolites that coordinate their behaviors. Here, we demonstrate that bacterial indole functions as a multifactorial mitigator of Klebsiella grimontii and Klebsiella oxytoca pathogenicity. These closely related microbes produce the enterotoxins tilimycin and tilivalline; cytotoxin-producing strains are the causative agent of antibiotic-associated hemorrhagic colitis and have been associated with necrotizing enterocolitis of premature infants. We demonstrate that carbohydrates induce cytotoxin synthesis while concurrently repressing indole biosynthesis. Conversely, indole represses cytotoxin production. In both cases, the alterations stemmed from differential transcription of npsA and npsB, key genes involved in tilimycin biosynthesis. Indole also enhances conversion of tilimycin to tilivalline, an indole analog with reduced cytotoxicity. In this context, we established that tilivalline, but not tilimycin, is a strong agonist of pregnane X receptor (PXR), a master regulator of xenobiotic detoxification and intestinal inflammation. Tilivalline binding upregulated PXR-responsive detoxifying genes and inhibited tubulin-directed toxicity. Bacterial indole, therefore, acts in a multifunctional manner to mitigate cytotoxicity by Klebsiella spp.: suppression of toxin production, enhanced conversion of tilimycin to tilivalline, and activation of PXR. IMPORTANCE The human gut harbors a complex community of microbes, including several species and strains that could be commensals or pathogens depending on context. The specific environmental conditions under which a resident microbe changes its relationship with a host and adopts pathogenic behaviors, in many cases, remain poorly understood. Here, we describe a novel communication network involving the regulation of K. grimontii and K. oxytoca enterotoxicity. Bacterial indole was identified as a central modulator of these colitogenic microbes by suppressing bacterial toxin (tilimycin) synthesis and converting tilimycin to tilivalline while simultaneously activating a host receptor, PXR, as a means of mitigating tissue cytotoxicity. On the other hand, fermentable carbohydrates were found to inhibit indole biosynthesis and enhance toxin production. This integrated network involving microbial, host, and metabolic factors provides a contextual framework to better understand K. oxytoca complex pathogenicity.
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Aurif F, Kaur H, Chio JPG, Kittaneh M, Malik BH. The Association Between Cholecystectomy and Colorectal Cancer in the Female Gender. Cureus 2021; 13:e20113. [PMID: 34984153 PMCID: PMC8720289 DOI: 10.7759/cureus.20113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Accepted: 12/02/2021] [Indexed: 11/25/2022] Open
Abstract
Colorectal carcinoma (CRC) has been of great interest among researchers, and multiple causes have been proposed and accepted; however, cholecystectomy (CMY) as a potential cause for CRC, particularly in the female gender has not been studied in detail, despite multiple evidence suggesting a positive association. This review is directed at investigating the association between CMY and CRC in the female gender and aims at finding a potential cause for this association. CRC involves cancer of the sigmoid and rectum. The composition of the bile acids is altered in patients after CMY, and the resultant secondary bile acids (BA) without a functioning gall bladder are exposed directly to the intestines, which could lead to cancer. An increase in fecal secondary bile acids is also described as high in the CMY population and has been linked to cancer. Right-sided GI cancers were attributed to CMY, although many earlier studies did not find this to be true. It is interesting to note a strong association between CRC and CMY in the female western population.
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"The quantitative determination of indolic microbial tryptophan metabolites in human and rodent samples: A systematic review". J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1186:123008. [PMID: 34735972 DOI: 10.1016/j.jchromb.2021.123008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Accepted: 10/18/2021] [Indexed: 02/08/2023]
Abstract
Concentrations reported for indolic microbial metabolites of tryptophan in human and rodent brain, cerebrospinal fluid, plasma, saliva and feces were compiled and discussed. A systematic review of the literature was accomplished by key word searches of Pubmed, Google Scholar and the Human Metabolome Data Base (HMDB), and by searching bibliographies of identified publications including prior reviews. The review was prompted by the increasing appreciation of the physiological importance of the indolic compounds in human health and disease. The compounds included were indoleacetic acid (IAA), indole propionic acid (IPA), indoleacrylic acid (IACR), indolelactic acid (ILA) indolepyruvic acid (IPY), indoleacetaldehyde (IAALD), indolealdehyde (IALD), tryptamine (TAM), indole (IND) and skatole (SKT). The undertaking aimed to vet and compare existing reports, to resolve apparent discrepancies, to draw biological inferences from the consideration of multiple analytes across sample types, to survey the analytical methodologies used, and to point out areas in need of greater attention.
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Mertowska P, Mertowski S, Wojnicka J, Korona-Głowniak I, Grywalska E, Błażewicz A, Załuska W. A Link between Chronic Kidney Disease and Gut Microbiota in Immunological and Nutritional Aspects. Nutrients 2021; 13:3637. [PMID: 34684638 PMCID: PMC8540836 DOI: 10.3390/nu13103637] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 02/07/2023] Open
Abstract
Chronic kidney disease (CKD) is generally progressive and irreversible, structural or functional renal impairment for 3 or more months affecting multiple metabolic pathways. Recently, the composition, dynamics, and stability of a patient's microbiota has been noted to play a significant role during disease onset or progression. Increasing urea concentration during CKD can lead to an acceleration of the process of kidney injury leading to alterations in the intestinal microbiota that can increase the production of gut-derived toxins and alter the intestinal epithelial barrier. A detailed analysis of the relationship between the role of intestinal microbiota and the development of inflammation within the symbiotic and dysbiotic intestinal microbiota showed significant changes in kidney dysfunction. Several recent studies have determined that dietary factors can significantly influence the activation of immune cells and their mediators. Moreover, dietary changes can profoundly affect the balance of gut microbiota. The aim of this review is to present the importance and factors influencing the differentiation of the human microbiota in the progression of kidney diseases, such as CKD, IgA nephropathy, idiopatic nephropathy, and diabetic kidney disease, with particular emphasis on the role of the immune system. Moreover, the effects of nutrients, bioactive compounds on the immune system in development of chronic kidney disease were reviewed.
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Affiliation(s)
- Paulina Mertowska
- Department of Experimental Immunology, Medical University of Lublin, 4a Chodzki Street, 20-093 Lublin, Poland; (P.M.); (S.M.); (E.G.)
| | - Sebastian Mertowski
- Department of Experimental Immunology, Medical University of Lublin, 4a Chodzki Street, 20-093 Lublin, Poland; (P.M.); (S.M.); (E.G.)
| | - Julia Wojnicka
- Department of Pathobiochemistry and Interdisciplinary Applications of Ion Chromatography, Medical University of Lublin, 1 Chodzki Street, 20-093 Lublin, Poland; (J.W.); (A.B.)
| | - Izabela Korona-Głowniak
- Department of Pharmaceutical Microbiology, Medical University of Lublin, 1 Chodzki Street, 20-093 Lublin, Poland
| | - Ewelina Grywalska
- Department of Experimental Immunology, Medical University of Lublin, 4a Chodzki Street, 20-093 Lublin, Poland; (P.M.); (S.M.); (E.G.)
| | - Anna Błażewicz
- Department of Pathobiochemistry and Interdisciplinary Applications of Ion Chromatography, Medical University of Lublin, 1 Chodzki Street, 20-093 Lublin, Poland; (J.W.); (A.B.)
| | - Wojciech Załuska
- Department of Nephrology, Medical University of Lublin, 8 Jaczewskiego Street, 20-954 Lublin, Poland;
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Hoshiko Y, Nishiyama Y, Moriya T, Kadokami K, López-Jácome LE, Hirano R, García-Contreras R, Maeda T. Quinolone Signals Related to Pseudomonas Quinolone Signal-Quorum Sensing Inhibits the Predatory Activity of Bdellovibrio bacteriovorus. Front Microbiol 2021; 12:722579. [PMID: 34566925 PMCID: PMC8461301 DOI: 10.3389/fmicb.2021.722579] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/12/2021] [Indexed: 12/12/2022] Open
Abstract
Bdellovibrio bacteriovorus is one of the predatory bacteria; therefore, it can act as a novel “living antibiotic,” unlike the current antibiotics. Here the predation of Escherichia coli by B. bacteriovorus was inhibited in the presence of Pseudomonas aeruginosa. This study investigated whether P. aeruginosa-induced predation inhibition is associated with bacterial quorum sensing (QS). Each las, rhl, or pqs QS mutant in P. aeruginosa was used to check the predatory activity of E. coli cells using B. bacteriovorus. As a result, the predatory activity of B. bacteriovorus increased in a mutant pqs QS system, whereas wild-type PA14 inhibited the predatory activity. Moreover, the addition of 4-hydroxy-2-heptylquinoline (HHQ) or the analog triggered the low predatory activity of B. bacteriovorus and killed B. bacteriovorus cells. Therefore, a defensive action of P. aeruginosa against B. bacteriovorus is activated by the pqs QS system, which produces some quinolone compounds such as HHQ.
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Affiliation(s)
- Yuki Hoshiko
- Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | - Yoshito Nishiyama
- Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | - Tae Moriya
- Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | - Kiwao Kadokami
- Institute of Environmental Science and Technology, The University of Kitakyushu, Kitakyushu, Japan
| | - Luis Esaú López-Jácome
- Department of Microbiology and Parasitology, Faculty of Medicine, UNAM, Mexico City, Mexico.,Laboratory of Infectology, National Institute of Rehabilitation Luis Guillermo Ibarra Ibarra, Mexico City, Mexico
| | - Ryutaro Hirano
- Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
| | | | - Toshinari Maeda
- Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
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12
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Samuelson DR, Gu M, Shellito JE, Molina PE, Taylor CM, Luo M, Welsh DA. Pulmonary immune cell trafficking promotes host defense against alcohol-associated Klebsiella pneumonia. Commun Biol 2021; 4:997. [PMID: 34426641 PMCID: PMC8382828 DOI: 10.1038/s42003-021-02524-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 08/05/2021] [Indexed: 12/15/2022] Open
Abstract
The intestinal microbiota generates many different metabolites which are critical for the regulation of host signaling pathways. In fact, a wide-range of diseases are associated with increased levels of local or systemic microbe-derived metabolites. In contrast, certain bacterial metabolites, such as tryptophan metabolites, are known to contribute to both local and systemic homeostasis. Chronic alcohol consumption is accompanied by alterations to intestinal microbial communities, and their functional capacities. However, little is known about the role of alcohol-associated dysbiosis on host defense against bacterial pneumonia. Our previous work using fecal transplantation demonstrated that alcohol-associated intestinal dysbiosis, independent of ethanol consumption, increased susceptibility to Klebsiella pneumonia. Here, we demonstrate that intestinal microbiota treatments mitigate the increased risk of alcohol-associated pneumonia. Treatment with the microbial metabolite indole or with probiotics reduced pulmonary and extrapulmonary bacterial burden, restored immune responses, and improved cellular trafficking required for host defense. Protective effects were, in part, mediated by aryl hydrocarbon receptors (AhR), as inhibition of AhR diminished the protective effects. Thus, alcohol appears to impair the production/processing of tryptophan catabolites resulting in immune dysregulation and impaired cellular trafficking. These data support microbiota therapeutics as novel strategies to mitigate the increased risk for alcohol-associated bacterial pneumonia. Samuelson et al show that alcohol impairs the production/processing of microbial metabolites, specifically tryptophan catabolites, resulting in immune dysregulation and impaired cellular trafficking for optimal host defense. The metabolite, indole, or probiotics making indole metabolites mitigate alcohol-induced susceptibility to Klebsiella-associated pneumonia, and that the mechanisms are partially dependent on AhR.
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Affiliation(s)
- Derrick R Samuelson
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, USA. .,Department of Internal Medicine, Division of Pulmonary, Critical Care, & Sleep, University of Nebraska Medical Center, Omaha, NE, USA.
| | - Min Gu
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Judd E Shellito
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, USA.,Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Patricia E Molina
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Christopher M Taylor
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Meng Luo
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - David A Welsh
- Department of Internal Medicine, Section of Pulmonary/Critical Care & Allergy/Immunology, Louisiana State University Health Sciences Center, New Orleans, LA, USA.,Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
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13
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Knudsen C, Neyrinck AM, Leyrolle Q, Baldin P, Leclercq S, Rodriguez J, Beaumont M, Cani PD, Bindels LB, Lanthier N, Delzenne NM. Hepatoprotective Effects of Indole, a Gut Microbial Metabolite, in Leptin-Deficient Obese Mice. J Nutr 2021; 151:1507-1516. [PMID: 33693866 PMCID: PMC8169809 DOI: 10.1093/jn/nxab032] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 10/30/2020] [Accepted: 01/28/2021] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The gut microbiota plays a role in the occurrence of nonalcoholic fatty liver disease (NAFLD), notably through the production of bioactive metabolites. Indole, a bacterial metabolite of tryptophan, has been proposed as a pivotal metabolite modulating inflammation, metabolism, and behavior. OBJECTIVES The aim of our study was to mimic an upregulation of intestinal bacterial indole production and to evaluate its potential effect in vivo in 2 models of NAFLD. METHODS Eight-week-old leptin-deficient male ob/ob compared with control ob/+ mice (experiment 1), and 4-5-wk-old C57BL/6JRj male mice fed a low-fat (LF, 10 kJ%) compared with a high-fat (HF, 60 kJ%) diet (experiment 2), were given plain water or water supplemented with a physiological dose of indole (0.5 mM, n ≥6/group) for 3 wk and 3 d, respectively. The effect of the treatments on the liver, intestine, adipose tissue, brain, and behavior was assessed. RESULTS Indole reduced hepatic expression of genes involved in inflammation [C-C motif chemokine ligand 2 (Ccl2), C-X-C motif chemokine ligand 2 (Cxcl2); 3.3- compared with 5.0-fold, and 2.4- compared with 3.3-fold of control ob/+ mice, respectively, P < 0.05], and in macrophage activation [Cd68, integrin subunit α X (Itgax); 2.1- compared with 2.5-fold, and 5.0- compared with 6.4-fold of control ob/+ mice, respectively, P < 0.01] as well as markers of hepatic damage (alaninine aminotransferase; -32%, P < 0.001) regardless of genotype in experiment 1. Indole had no effect on hepatic inflammation in mice fed the LF or HF diet in experiment 2. Indole did not change hepatic lipid content, anxiety-like behavior, or inflammation in the ileum, adipose tissue, and brain in experiment 1. CONCLUSIONS Our results support the efficacy of indole to reduce hepatic damage and associated inflammatory response and macrophage activation in ob/ob mice. These modifications appear to be attributable to direct effects of indole on the liver, rather than through effects on the adipose tissue or intestinal barrier.
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Affiliation(s)
- Christelle Knudsen
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute, UCLouvain, Université catholique de Louvain, Brussels, Belgium
- GenPhySE, Université de Toulouse, INRAE, ENVT, 31320, Castanet Tolosan, France
| | - Audrey M Neyrinck
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute, UCLouvain, Université catholique de Louvain, Brussels, Belgium
| | - Quentin Leyrolle
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute, UCLouvain, Université catholique de Louvain, Brussels, Belgium
| | - Pamela Baldin
- Service d'Anatomie Pathologique Cliniques Universitaires Saint-Luc, Brussels, Belgium
| | - Sophie Leclercq
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute, UCLouvain, Université catholique de Louvain, Brussels, Belgium
- Institute of Neuroscience, UCLouvain, Université catholique de Louvain, Brussels, Belgium
| | - Julie Rodriguez
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute, UCLouvain, Université catholique de Louvain, Brussels, Belgium
| | - Martin Beaumont
- GenPhySE, Université de Toulouse, INRAE, ENVT, 31320, Castanet Tolosan, France
| | - Patrice D Cani
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute, UCLouvain, Université catholique de Louvain, Brussels, Belgium
- WELBIO–Walloon Excellence in Life Sciences and BIOtechnology, UCLouvain, Université catholique de Louvain, Brussels, Belgium
| | - Laure B Bindels
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute, UCLouvain, Université catholique de Louvain, Brussels, Belgium
| | - Nicolas Lanthier
- Service d'Hépato-gastroentérologie, Cliniques universitaires Saint-Luc, Brussels, Belgium
- Laboratory of Gastroenterology and Hepatology, Institut de Recherche Expérimentale et Clinique, UCLouvain, Université catholique de Louvain, Brussels, Belgium
| | - Nathalie M Delzenne
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute, UCLouvain, Université catholique de Louvain, Brussels, Belgium
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14
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Alexander C, Cross TWL, Lee AH, Ly LK, Vieson MD, Ridlon JM, Nelson ER, Swanson KS. Development of a novel model of cholecystectomy in subsequently ovariectomized mice and characterization of metabolic and gastrointestinal phenotypes: a pilot study. BMC Gastroenterol 2021; 21:62. [PMID: 33573601 PMCID: PMC7879663 DOI: 10.1186/s12876-021-01648-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 01/20/2021] [Indexed: 11/29/2022] Open
Abstract
Background Cholecystectomy (XGB) is the most common abdominal surgery performed in the United States and is associated with an increased post-surgery incidence of metabolic and gastrointestinal (GI) diseases. Two main risk factors for XGB are sex (female) and age (40–50 yr), corresponding with onset of menopause. Post-menopausal estrogen loss alone facilitates metabolic dysfunction, but the effects of XGB on metabolic and GI health have yet to be investigated in this population. Study objectives were to (1) identify possible short-term effects of XGB and (2) develop a novel murine model of XGB in human menopause via subsequent ovariectomy (OVX) and assess longitudinal effects of OVX on metabolism, GI physiology, and GI microbiota in XGB mice. Methods Female C57BL/6 mice were utilized in two parallel studies (S1&S2). In S1, XGB mice were compared to a non-XGB baseline group after six wk. In S2, mice were XGB at wk0, either sham (SHM) or OVX at wk6, and sacrificed at wk12, wk18, and wk24. Body composition assessment and fresh fecal collections were conducted periodically. Serum and tissues were collected at sacrifice for metabolic and GI health endpoints. Results Compared to baseline, XGB increased hepatic CYP7A1 and decreased HMGCR relative expression, but did not influence BW, fat mass, or hepatic triglycerides after six wk. In S2, XGB/OVX mice had greater BW and fat mass than XGB/SHM. Cecal microbiota alpha diversity metrics were lower in XGB/OVX mice at wk24 compared the XGB/SHM. No consistent longitudinal patterns in fasting serum lipids, fecal microbial diversity, and GI gene expression were observed between S2 groups. Conclusions In addition to developing a novel, clinically-representative model of XGB and subsequent OVX, our results suggest that OVX resulted in the expected phenotype to some extent, but that XGB may modify or mask some responses and requires further investigation.
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Affiliation(s)
- Celeste Alexander
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA.
| | - Tzu-Wen L Cross
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA
| | - Anne H Lee
- Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Lindsey K Ly
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA
| | - Miranda D Vieson
- College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Jason M Ridlon
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA.,Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA.,Cancer Center at Illinois, University of Illinois at Urbana-Champaign, Urbana, IL, USA.,Carl R. Woese Institute for Genomic Biology, Anticancer Discovery from Pets to People Theme, University of Illinois Urbana-Champaign, IL, Urbana, USA
| | - Erik R Nelson
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA.,Cancer Center at Illinois, University of Illinois at Urbana-Champaign, Urbana, IL, USA.,Carl R. Woese Institute for Genomic Biology, Anticancer Discovery from Pets to People Theme, University of Illinois Urbana-Champaign, IL, Urbana, USA.,Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.,University of Illinois Cancer Center, University of Illinois at Chicago, Chicago, IL, USA
| | - Kelly S Swanson
- Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, 1207 W Gregory Dr, Urbana, IL, 61801, USA. .,Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
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15
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Maiti S, Grivas G, Choi K, Dai W, Ding Y, Acosta DP, Hahn J, Jayaraman A. MODELING INTER-KINGDOM REGULATION OF INFLAMMATORY SIGNALING IN HUMAN INTESTINAL EPITHELIAL CELLS. Comput Chem Eng 2020; 140. [PMID: 32669746 DOI: 10.1016/j.compchemeng.2020.106954] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The human gastrointestinal (GI) tract is colonized by a highly diverse and complex microbial community (i.e., microbiota). The microbiota plays an important role in the development of the immune system, specifically mediating inflammatory responses, however the exact mechanisms are poorly understood. We have developed a mathematical model describing the effect of indole on host inflammatory signaling in HCT-8 human intestinal epithelial cells. In this model, indole modulates transcription factor nuclear factor κ B (NF-κB) and produces the chemokine interleukin-8 (IL-8) through the activation of the aryl hydrocarbon receptor (AhR). Phosphorylated NF-κB exhibits dose and time-dependent responses to indole concentrations and IL-8 production shows a significant down-regulation for 0.1 ng/mL TNF-α stimulation. The model shows agreeable simulation results with the experimental data for IL-8 secretion and normalized NF-κB values. Our results suggest that microbial metabolites such as indole can modulate inflammatory signaling in HTC-8 cells through receptor-mediated processes.
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Affiliation(s)
- Shreya Maiti
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX
| | - Genevieve Grivas
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY
| | - Kyungoh Choi
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX
| | - Wei Dai
- Department of Chemical & Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY
| | - Yufang Ding
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX
| | | | - Juergen Hahn
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY.,Department of Chemical & Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY
| | - Arul Jayaraman
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX
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16
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Williams KB, Bischof J, Lee FJ, Miller KA, LaPalme JV, Wolfe BE, Levin M. Regulation of axial and head patterning during planarian regeneration by a commensal bacterium. Mech Dev 2020; 163:103614. [DOI: 10.1016/j.mod.2020.103614] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Accepted: 05/06/2020] [Indexed: 02/08/2023]
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17
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Mitchell RJ, Mun W, Mabekou SS, Jang H, Choi SY. Compounds affecting predation by and viability of predatory bacteria. Appl Microbiol Biotechnol 2020; 104:3705-3713. [DOI: 10.1007/s00253-020-10530-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 03/01/2020] [Accepted: 03/05/2020] [Indexed: 12/13/2022]
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18
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Osadchuk MA, Svistunov AA, Mironova ED, Vasil'eva IN, Kireeva NV. [Diseases of biliary tract in the context of association with oncological diseases of the digestive system]. TERAPEVT ARKH 2019; 91:98-104. [PMID: 32598596 DOI: 10.26442/00403660.2019.12.000455] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Indexed: 12/16/2022]
Abstract
Cancers of the gastrointestinal tract are widespread among the population and cause significant damage to the health care system. In order to improve the strategy of preventive measures and the detection of oncological diseases at the early stages, it is necessary to provide timely impact on possible risk factors contributing to the onset and progression of malignant neoplasms. This review demonstrates the association between the pathology of the biliary tract and oncological diseases of the digestive system, discusses the possible mechanisms of the influence of cholelithiasis and cholecystectomy on the development of malignant neoplasms of various parts of the gastrointestinal tract.
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Affiliation(s)
- M A Osadchuk
- Sechenov First Moscow State Medical University (Sechenov University)
| | - A A Svistunov
- Sechenov First Moscow State Medical University (Sechenov University)
| | - E D Mironova
- Sechenov First Moscow State Medical University (Sechenov University)
| | - I N Vasil'eva
- Sechenov First Moscow State Medical University (Sechenov University)
| | - N V Kireeva
- Sechenov First Moscow State Medical University (Sechenov University)
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19
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Li Q, Zhang M, Wu T, Liu R. Potential correlation between carbohydrate-active enzyme family 48 expressed by gut microbiota and the expression of intestinal epithelial AMP-activated protein kinase β. J Food Biochem 2019; 44:e13123. [PMID: 31837163 DOI: 10.1111/jfbc.13123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 11/19/2019] [Accepted: 11/24/2019] [Indexed: 12/12/2022]
Abstract
The expression of the carbohydrate-active enzyme family and related genes is known to be influenced by the response of intestinal microbiota to dietary changes. However, it is uncertain whether this is caused by variation in the intestinal microecology. In this study, metabolite analysis, 16S rDNA sequencing, metagenomics, and Western blotting were employed to investigate the effects of dietary intervention on the composition of gut microbiota and microbiota-mediated changes. The results showed that compared with the low fiber-fed group, the fiber diet-fed mice displayed a shift in gut microbiota composition to contain more members of phylum Bacteroidetes, accompanied by higher proportions of Akkermansia and typical probiotic Bifidobacterium. Moreover, correlations were found between microbial genes coding for carbohydrate-binding module family 48 (CBM48) and intestinal epithelial expression levels of AMPK β. This finding provides new insight for elucidating the contribution of dietary intervention through AMPK regulation linked to the microbial carbohydrate-binding family. PRACTICAL APPLICATIONS: The relationship suggested by these data will provide theoretical and applied foundations for the development of potential intervention targeting the interaction between gut microbiota and host health, particularly the use of dietary fiber as a medically relevant food. Additionally, a better understanding of the interactions between gut microbiota and intestinal epithelial will inform the development of gut microbiota intervention as a health-promoting procedure.
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Affiliation(s)
- Qian Li
- State Key Laboratory of Nutrition and Safety, Tianjin University of Science & Technology, Ministry of Science and Technology, Tianjin, P.R. China
| | - Min Zhang
- State Key Laboratory of Nutrition and Safety, Tianjin University of Science & Technology, Ministry of Science and Technology, Tianjin, P.R. China.,School of Food Science and Bioengineering, Tianjin Agricultural University, Tianjin, P.R. China
| | - Tao Wu
- State Key Laboratory of Nutrition and Safety, Tianjin University of Science & Technology, Ministry of Science and Technology, Tianjin, P.R. China.,Engineering Research Center of Food Biotechnology, Ministry of Education, Tianjin, P.R. China
| | - Rui Liu
- State Key Laboratory of Nutrition and Safety, Tianjin University of Science & Technology, Ministry of Science and Technology, Tianjin, P.R. China
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21
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Muku GE, Murray IA, Perdew GH. Activation of the Ah Receptor Modulates Gastrointestinal Homeostasis and the Intestinal Microbiome. ACTA ACUST UNITED AC 2019. [DOI: 10.1007/s40495-019-00197-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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22
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Wei L, Zhi X, He E, Qian L, Sun L, Zhu Z, Zeng Z, Qu W. Prospective study on changes in the donor gallbladder contraction function after left lateral lobe hepatectomy. Pediatr Transplant 2019; 23:e13395. [PMID: 31168898 DOI: 10.1111/petr.13395] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 11/28/2018] [Accepted: 01/23/2019] [Indexed: 12/24/2022]
Abstract
This study aimed to evaluate the feasibility of donor gallbladder preservation in liver transplantation. Conventional removal of the donor gallbladder is applied in a majority of pediatric liver transplantation. A total of 42 donors who underwent gallbladder preservation in liver transplantation from October 2013 to December 2015 at the Beijing Friendship Hospital, China, were enrolled for the study. The changes in gallbladder volume and the gallbladder EF of donors before and after surgery were measured through ultrasound, and the changes in the donor gallbladder contraction function before and after surgery were evaluated to help verify the feasibility of gallbladder preservation in living donor left lateral lobe hepatectomy. The gallbladder emptying index dropped to 42.67% in 2 weeks after surgery and gradually increased with the length of recovery time, which could reach 69.14% in 3 months after surgery. At that time, 97.6% of the donors were considered to have recovered their gallbladder contraction function. The gallbladder contraction function at an early stage after gallbladder preservation in liver transplantation is not obviously improved, but it can recover to a normal level in 1 month after surgery, indicating that the gallbladder preservation in hepatectomy of living donor can effectively guarantee the gallbladder contraction function.
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Affiliation(s)
- Lin Wei
- Liver Transplantation Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Xin Zhi
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Enhui He
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Linxue Qian
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Liying Sun
- Liver Transplantation Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Zhijun Zhu
- Liver Transplantation Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Zhigui Zeng
- Liver Transplantation Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Wei Qu
- Liver Transplantation Center, Beijing Friendship Hospital, Capital Medical University, Beijing, China
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23
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Abstract
Microbial establishment within the gastrointestinal (GI) tract requires surveillance of the gut biogeography. The gut microbiota coordinates behaviors by sensing host- or microbiota-derived signals. Here we show for the first time that microbiota-derived indole is highly prevalent in the lumen compared to the intestinal tissue. This difference in indole concentration plays a key role in modulating virulence gene expression of the enteric pathogens enterohemorrhagic Escherichia coli (EHEC) and Citrobacter rodentium Indole decreases expression of genes within the locus of enterocyte effacement (LEE) pathogenicity island, which is essential for these pathogens to form attaching and effacing (AE) lesions on enterocytes. We synthetically altered the concentration of indole in the GI tracts of mice by employing mice treated with antibiotics to deplete the microbiota and reconstituted with indole-producing commensal Bacteroides thetaiotaomicron (B. theta) or a B. theta ΔtnaA mutant (does not produce indole) or by engineering an indole-producing C. rodentium strain. This allowed us to assess the role of self-produced versus microbiota-produced indole, and the results show that decreased indole concentrations promote bacterial pathogenesis, while increased levels of indole decrease bacterial virulence gene expression. Moreover, we identified the bacterial membrane-bound histidine sensor kinase (HK) CpxA as an indole sensor. Enteric pathogens sense a gradient of indole concentrations in the gut to probe different niches and successfully establish an infection.IMPORTANCE Pathogens sense and respond to several small molecules within the GI tract to modulate expression of their virulence repertoire. Indole is a signaling molecule produced by the gut microbiota. Here we show that indole concentrations are higher in the lumen, where the microbiota is present, than in the intestinal tissue. The enteric pathogens EHEC and C. rodentium sense indole to downregulate expression of their virulence genes, as a read-out of the luminal compartment. We also identified the bacterial membrane-bound HK CpxA as an indole sensor. This regulation ensures that EHEC and C. rodentium express their virulence genes only at the epithelial lining, which is the niche they colonize.
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24
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Response of intestinal metabolome to polysaccharides from mycelia of Ganoderma lucidum. Int J Biol Macromol 2019; 122:723-731. [DOI: 10.1016/j.ijbiomac.2018.10.224] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 10/30/2018] [Accepted: 10/31/2018] [Indexed: 12/20/2022]
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25
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Lee J, Choe S, Park JW, Jeong SY, Shin A. The Risk of Colorectal Cancer After Cholecystectomy or Appendectomy: A Population-based Cohort Study in Korea. J Prev Med Public Health 2018; 51:281-288. [PMID: 30514058 PMCID: PMC6283741 DOI: 10.3961/jpmph.18.105] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 10/09/2018] [Indexed: 12/15/2022] Open
Abstract
Objectives We investigated the association between cholecystectomy or appendectomy and the subsequent risk of colorectal cancer (CRC) in the Korean population. Methods A retrospective cohort study was conducted with the National Health Insurance Service–National Sample Cohort of Korea; this sample was followed up from January 1, 2002, until the date of CRC incidence, loss to follow-up, or December 31, 2015. The exposure status of cholecystectomy and appendectomy was treated as a time-varying covariate. The calculated risk of CRC was stratified by follow-up period, and the association between these surgical procedures and CRC was investigated by a Cox regression model applying appropriate lag periods. Results A total of 707 663 individuals were identified for analysis. The study population was followed up for an average of 13.66 years, and 4324 CRC cases were identified. The hazard ratio (HR) of CRC was elevated in the first year after cholecystectomy (HR, 1.71; 95% confidence interval [CI], 1.01 to 2.89) and in the first year and 2-3 years after appendectomy (HR, 4.22; 95% CI, 2.87 to 6.20; HR, 2.34; 95% CI, 1.36 to 4.03, respectively). The HRs of CRC after applying 1 year of lag after cholecystectomy and 3 years of lag after appendectomy were 0.80 (95% CI, 0.57 to 1.13) and 0.77 (95% CI, 0.51 to 1.16), respectively. Conclusions The risk of CRC increased in the first year after cholecystectomy and appendectomy, implying the possibility of bias. When appropriate lag periods after surgery were applied, no association was found between cholecystectomy or appendectomy and CRC.
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Affiliation(s)
- Joonki Lee
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Sunho Choe
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Ji Won Park
- Division of Colorectal Surgery, Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.,Cancer Research Institute, Seoul National University, Seoul, Korea
| | - Seung-Yong Jeong
- Division of Colorectal Surgery, Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.,Cancer Research Institute, Seoul National University, Seoul, Korea
| | - Aesun Shin
- Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea.,Cancer Research Institute, Seoul National University, Seoul, Korea
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26
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Di Ciaula A, Garruti G, Wang DQH, Portincasa P. Cholecystectomy and risk of metabolic syndrome. Eur J Intern Med 2018; 53:3-11. [PMID: 29706426 PMCID: PMC8118133 DOI: 10.1016/j.ejim.2018.04.019] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 04/20/2018] [Accepted: 04/21/2018] [Indexed: 02/07/2023]
Abstract
The gallbladder physiologically concentrates and stores bile during fasting and provides rhythmic bile secretion both during fasting and in the postprandial phase to solubilize dietary lipids and fat-soluble vitamins. Bile acids (BAs), major lipid components of bile, play a key role as signaling molecules in modulating gene expression related to cholesterol, BA, glucose and energy metabolism. Cholecystectomy is the most commonly performed surgical procedure worldwide in patients who develop symptoms and/or complications of cholelithiasis of any type. Cholecystectomy per se, however, might cause abnormal metabolic consequences, i.e., alterations in glucose, insulin (and insulin-resistance), lipid and lipoprotein levels, liver steatosis and the metabolic syndrome. Mechanisms are likely mediated by the abnormal transintestinal flow of BAs, producing metabolic signaling that acts without gallbladder rhythmic function and involves the BAs/farnesoid X receptor (FXR) and the BA/G protein-coupled BA receptor 1 (GPBAR-1) axes in the liver, intestine, brown adipose tissue and muscle. Alterations of intestinal microbiota leading to distorted homeostatic processes are also possible. According to this view, cholecystectomy, via BA-induced changes in the enterohepatic circulation, is a risk factor for the metabolic abnormalities and becomes another “fellow traveler” with, or another risk factor for the metabolic syndrome.
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Affiliation(s)
| | - Gabriella Garruti
- Section of Endocrinology, Department of Emergency and Organ Transplantations, University of Bari "Aldo Moro" Medical School, Piazza G. Cesare 11, 70124 Bari, Italy
| | - David Q-H Wang
- Department of Medicine, Division of Gastroenterology and Liver Diseases, Marion Bessin Liver Research Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Piero Portincasa
- Clinica Medica "A. Murri", Department of Biomedical Sciences & Human Oncology, University of Bari Medical School, Bari, Italy.
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Ball HC, levari-Shariati S, Cooper LN, Aliani M. Comparative metabolomics of aging in a long-lived bat: Insights into the physiology of extreme longevity. PLoS One 2018; 13:e0196154. [PMID: 29715267 PMCID: PMC5929510 DOI: 10.1371/journal.pone.0196154] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2017] [Accepted: 04/06/2018] [Indexed: 12/21/2022] Open
Abstract
Vespertilionid bats (Mammalia: Order Chiroptera) live 3–10 times longer than other mammals of an equivalent body size. At present, nothing is known of how bat fecal metabolic profiles shift with age in any taxa. This study established the feasibility of using a non-invasive, fecal metabolomics approach to examine age-related differences in the fecal metabolome of young and elderly adult big brown bats (Eptesicus fuscus) as an initial investigation into using metabolomics for age determination. Samples were collected from captive, known-aged big brown bats (Eptesicus fuscus) from 1 to over 14 years of age: these two ages represent age groups separated by approximately 75% of the known natural lifespan of this taxon. Results showed 41 metabolites differentiated young (n = 22) and elderly (n = 6) Eptesicus. Significant differences in metabolites between young and elderly bats were associated with tryptophan metabolism and incomplete protein digestion. Results support further exploration of the physiological mechanisms bats employ to achieve exceptional longevity.
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Affiliation(s)
- Hope C. Ball
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown, Ohio, The United States of America
- Musculoskeletal Biology Group, Northeast Ohio Medical University, Rootstown, Ohio, The United States of America
| | - Shiva levari-Shariati
- Canadian Centre for Agri-Food Research in Health and Medicine, St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, Canada
| | - Lisa Noelle Cooper
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown, Ohio, The United States of America
- Musculoskeletal Biology Group, Northeast Ohio Medical University, Rootstown, Ohio, The United States of America
- * E-mail: (LNC); (MA)
| | - Michel Aliani
- Canadian Centre for Agri-Food Research in Health and Medicine, St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, Canada
- Department of Foods and Human Nutritional Sciences, University of Manitoba, Duff Roblin Building, Winnipeg, Canada
- * E-mail: (LNC); (MA)
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28
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Indole-Induced Reversion of Intrinsic Multiantibiotic Resistance in Lysobacter enzymogenes. Appl Environ Microbiol 2017. [PMID: 28625984 DOI: 10.1128/aem.00995-17] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Lysobacter species are a group of environmental bacteria that are emerging as a new source of antibiotics. One characteristic of Lysobacter is intrinsic resistance to multiple antibiotics, which had not been studied. To understand the resistance mechanism, we tested the effect of blocking two-component regulatory systems (TCSs) on the antibiotic resistance of Lysobacter enzymogenes, a prolific producer of antibiotics. Upon treatment with LED209, an inhibitor of the widespread TCS QseC/QseB, L. enzymogenes produced a large amount of an unknown metabolite that was barely detectable in the untreated culture. Subsequent structural elucidation by nuclear magnetic resonance (NMR) unexpectedly revealed that the metabolite was indole. Indole production was also markedly induced by adrenaline, a known modulator of QseC/QseB. Next, we identified two TCS genes, L. enzymogenesqseC (Le-qseC) and Le-qseB, in L. enzymogenes and found that mutations of Le-qseC and Le-qseB also led to a dramatic increase in indole production. We then chemically synthesized a fluorescent indole probe that could label the cells. While the Le-qseB (cytoplasmic response regulator) mutant was clearly labeled by the probe, the Le-qseC (membrane sensor) mutant was not labeled. It was reported previously that indole can enhance antibiotic resistance in bacteria. Therefore, we tested if the dramatic increase in the level of indole production in L. enzymogenes upon blocking of Le-qseC and Le-qseB would lead to enhanced antibiotic resistance. Surprisingly, we found that indole caused the intrinsically multiantibiotic-resistant bacterium L. enzymogenes to become susceptible. Point mutations at conserved amino acids in Le-QseC also led to antibiotic susceptibility. Because indole is known as an interspecies signal, these findings may have implications.IMPORTANCE The environmental bacterium Lysobacter is a new source of antibiotic compounds and exhibits intrinsic antibiotic resistance. Here, we found that the inactivation of a two-component regulatory system (TCS) by an inhibitor or by gene deletion led to a remarkable increase in the level of production of a metabolite in L. enzymogenes, and this metabolite was identified to be indole. We chemically synthesized a fluorescent indole probe and found that it could label the wild type and a mutant of the TCS cytoplasmic response regulator but not a mutant of the TCS membrane sensor. Indole treatment caused the intrinsically multidrug-resistant bacterium L. enzymogenes to be susceptible to antibiotics. Mutations of the TCS sensor also led to antibiotic susceptibility. Because indole is known as an interspecies signal between gut microbiota and mammalian hosts, the observation that indole could render intrinsically resistant L. enzymogenes susceptible to common antibiotics may have implications.
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Zhang Y, Liu H, Li L, Ai M, Gong Z, He Y, Dong Y, Xu S, Wang J, Jin B, Liu J, Teng Z. Cholecystectomy can increase the risk of colorectal cancer: A meta-analysis of 10 cohort studies. PLoS One 2017; 12:e0181852. [PMID: 28771518 PMCID: PMC5542607 DOI: 10.1371/journal.pone.0181852] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 07/07/2017] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVE This study aimed to elucidate the effects of cholecystectomy on the risk of colorectal cancer (CRC) by conducting a meta-analysis of 10 cohort studies. METHODS The eligible cohort studies were selected by searching the PubMed and EMBASE databases from their origination to June 30, 2016, as well as by consulting the reference lists of the selected articles. Two authors individually collected the data from the 10 papers. When the data showed marked heterogeneity, we used a random-effects model to estimate the overall pooled risk; otherwise, a fixed effects model was employed. RESULTS The final analysis included ten cohort studies. According to the Newcastle-Ottawa Scale (NOS), nine papers were considered high quality. After the data of these 9 studies were combined, an increased risk of CRC was found among the individuals who had undergone cholecystectomy (risk ratio (RR) 1.22; 95% confidence interval (CI) 1.08-1.38). In addition, we also found a promising increased risk for colon cancer (CC) (RR 1.30, 95% CI 1.07-1.58), but no relationship between cholecystectomy and rectum cancer (RC) (RR 1.09; 95% CI 0.89-1.34) was observed. Additionally, in the sub-group analysis of the tumor location in the colon, a positive risk for ascending colon cancer (ACC) was found (RR 1.18, 95% CI 1.11-1.26). After combining the ACC, transverse colon cancer (TCC), sigmoid colon cancer (SCC) and descending colon cancer (DCC) patients, we found a positive relationship with cholecystectomy (RR 1.18, 95% CI 1.11-1.26). Furthermore, after combining the ACC and DCC patients, we also found a positive relationship with cholecystectomy (RR 1.28; 95% CI 1.11-1.26) in the sub-group analysis. In an additional sub-group analysis of patients from Western countries, there was a positive relationship between cholecystectomy and the risk of CRC (RR 1.20; 95% CI 1.05-1.36). Furthermore, a positive relationship between female gender and CRC was also found (RR 1.17; 95% CI 1.03-1.34). However, there was no relationship between gender and CC or RC. Furthermore, no publication bias was observed, and the sensitivity analysis indicated stable results. CONCLUSIONS This meta-analysis of 10 cohort studies revealed that cholecystectomy is associated with an increased risk for CRC, CC and ACC, particularly in Western countries. No relationship between cholecystectomy and RC was observed. There was no relationship between gender and either CC or RC, but a positive relationship between female gender and CRC was observed.
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Affiliation(s)
- Yong Zhang
- Department of General Surgery, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
| | - Hao Liu
- Department of General Surgery, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
| | - Li Li
- Department of General Surgery, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
| | - Min Ai
- School of Public Health, Dali University, Dali, Yunnan, China
| | - Zheng Gong
- Department of General Surgery, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
| | - Yong He
- Department of General Surgery, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
| | - Yunlong Dong
- Department of General Surgery, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
| | - Shuanglan Xu
- Department of Respiratory Medicine, The Affiliated Yanan Hospital of Kunming Medical University, Kunming, Yunnan, China
| | - Jun Wang
- Department of General Surgery, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
| | - Bo Jin
- Department of General Surgery, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
| | - Jianping Liu
- Department of Science and Education, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
| | - Zhaowei Teng
- Department of Orthopedic Surgery, The 6th Affiliated Hospital of Kunming Medical University, The People’s Hospital of Yuxi City, Yuxi, Yunnan, China
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30
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Steinmeyer S, Howsmon DP, Alaniz RC, Hahn J, Jayaraman A. Empirical modeling of T cell activation predicts interplay of host cytokines and bacterial indole. Biotechnol Bioeng 2017; 114:2660-2667. [PMID: 28667749 DOI: 10.1002/bit.26371] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 06/21/2017] [Accepted: 06/30/2017] [Indexed: 12/24/2022]
Abstract
Adoptive transfer of anti-inflammatory FOXP3+ Tregs has gained attention as a new therapeutic strategy for auto-inflammatory disorders such as Inflammatory Bowel Disease. The isolated cells are conditioned in vitro to obtain a sufficient number of anti-inflammatory FOXP3+ Tregs that can be reintroduced into the patient to potentially reduce the pathologic inflammatory response. Previous evidence suggests that microbiota metabolites can potentially condition cells during the in vitro expansion/differentiation step. However, the number of combinations of cytokines and metabolites that can be varied is large, preventing a purely experimental investigation which would determine optimal cell therapeutic outcomes. To address this problem, a combined experimental and modeling approached is investigated here: an artificial neural network model was trained to predict the steady-state T cell population phenotype after differentiation with a variety of host cytokines and the microbial metabolite indole. This artificial neural network model was able to both reliably predict the phenotype of these T cell populations and also uncover unexpected conditions for optimal Treg differentiation that were subsequently verified experimentally. Biotechnol. Bioeng. 2017;114: 2660-2667. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Shelby Steinmeyer
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, College Station, Texas
| | - Daniel P Howsmon
- Department of Chemical & Biological Engineering, Rensselaer Polytechnic Institute, 110 Eighth St., CBIS # 4213, Troy, New York, 12180.,Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York
| | - Robert C Alaniz
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, College Station, Texas
| | - Juergen Hahn
- Department of Chemical & Biological Engineering, Rensselaer Polytechnic Institute, 110 Eighth St., CBIS # 4213, Troy, New York, 12180.,Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York.,Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York
| | - Arul Jayaraman
- Department of Chemical Engineering, Texas A&M University, 3122 TAMU Room 200, College Station, Texas, 77843
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31
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Lai Y, Xu Z, Yan A. A novel regulatory circuit to control indole biosynthesis protectsEscherichia colifrom nitrosative damages during the anaerobic respiration of nitrate. Environ Microbiol 2016; 19:598-610. [DOI: 10.1111/1462-2920.13527] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 09/08/2016] [Indexed: 01/09/2023]
Affiliation(s)
- Yong Lai
- School of Biological Sciences; The University of Hong Kong; Hong Kong SAR
| | - Zeling Xu
- School of Biological Sciences; The University of Hong Kong; Hong Kong SAR
| | - Aixin Yan
- School of Biological Sciences; The University of Hong Kong; Hong Kong SAR
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32
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Fecal Indole as a Biomarker of Susceptibility to Cryptosporidium Infection. Infect Immun 2016; 84:2299-306. [PMID: 27245413 DOI: 10.1128/iai.00336-16] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 05/22/2016] [Indexed: 01/16/2023] Open
Abstract
Cryptosporidium causes significant diarrhea worldwide, especially among children and immunocompromised individuals, and no effective drug treatment is currently available for those who need it most. In this report, previous volunteer infectivity studies have been extended to examine the association between fecal indole and indole-producing (IP) gut microbiota on the outcome of a Cryptosporidium infection. Fecal indole concentrations (FICs) of 50 subjects and 19 taxa of common gut microbiota, including six IP taxa (11 subjects) were determined in stool samples collected before and after a challenge with Cryptosporidium oocysts. At the baseline, the mean FIC (± the standard deviation) was 1.66 ± 0.80 mM in those who became infected after a challenge versus 3.20 ± 1.23 mM in those who remained uninfected (P = 0.0001). Only 11.1% of the subjects with a FIC of >2.5 mM became infected after a challenge versus 65.2% of the subjects with a FIC of <2.5 mM. In contrast, the FICs of infected subjects at the baseline or during diarrhea were not correlated with infection intensity or disease severity. The relative abundances (percent) of Escherichia coli, Bacillus spp., and Clostridium spp. were greater ≥2.5-fold in volunteers with a baseline FIC of >2.5 mM, while those of Bacteroides pyogenes, B. fragilis, and Akkermansia muciniphila were greater in those with a baseline FIC of <2.5 mM. These data indicate that some IP bacteria, or perhaps indole alone, can influence the ability of Cryptosporidium to establish an infection. Thus, preexisting indole levels in the gut join the oocyst dose and immune status as important factors that determine the outcome of Cryptosporidium exposure.
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Housset C, Chrétien Y, Debray D, Chignard N. Functions of the Gallbladder. Compr Physiol 2016; 6:1549-77. [PMID: 27347902 DOI: 10.1002/cphy.c150050] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The gallbladder stores and concentrates bile between meals. Gallbladder motor function is regulated by bile acids via the membrane bile acid receptor, TGR5, and by neurohormonal signals linked to digestion, for example, cholecystokinin and FGF15/19 intestinal hormones, which trigger gallbladder emptying and refilling, respectively. The cycle of gallbladder filling and emptying controls the flow of bile into the intestine and thereby the enterohepatic circulation of bile acids. The gallbladder also largely contributes to the regulation of bile composition by unique absorptive and secretory capacities. The gallbladder epithelium secretes bicarbonate and mucins, which both provide cytoprotection against bile acids. The reversal of fluid transport from absorption to secretion occurs together with bicarbonate secretion after feeding, predominantly in response to an adenosine 3',5'-cyclic monophosphate (cAMP)-dependent pathway triggered by neurohormonal factors, such as vasoactive intestinal peptide. Mucin secretion in the gallbladder is stimulated predominantly by calcium-dependent pathways that are activated by ATP present in bile, and bile acids. The gallbladder epithelium has the capacity to absorb cholesterol and provides a cholecystohepatic shunt pathway for bile acids. Changes in gallbladder motor function not only can contribute to gallstone disease, but also subserve protective functions in multiple pathological settings through the sequestration of bile acids and changes in the bile acid composition. Cholecystectomy increases the enterohepatic recirculation rates of bile acids leading to metabolic effects and an increased risk of nonalcoholic fatty liver disease, cirrhosis, and small-intestine carcinoid, independently of cholelithiasis. Among subjects with gallstones, cholecystectomy remains a priority in those at risk of gallbladder cancer, while others could benefit from gallbladder-preserving strategies. © 2016 American Physiological Society. Compr Physiol 6:1549-1577, 2016.
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Affiliation(s)
- Chantal Housset
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, UMR_S 938, Centre de Recherche Saint-Antoine, Institute of Cardiometabolism and Nutrition (ICAN), Paris, France.,Assistance Publique-Hôpitaux de Paris, Hôpital Saint-Antoine, Centre de Référence Maladies Rares (CMR) des Maladies Inflammatoires des Voies Biliaires (MIVB), Service d'Hépatologie, Paris, France
| | - Yues Chrétien
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, UMR_S 938, Centre de Recherche Saint-Antoine, Institute of Cardiometabolism and Nutrition (ICAN), Paris, France.,Assistance Publique-Hôpitaux de Paris, Hôpital Saint-Antoine, Centre de Référence Maladies Rares (CMR) des Maladies Inflammatoires des Voies Biliaires (MIVB), Service d'Hépatologie, Paris, France
| | - Dominique Debray
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, UMR_S 938, Centre de Recherche Saint-Antoine, Institute of Cardiometabolism and Nutrition (ICAN), Paris, France.,Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants Malades, Medical-Surgical Center, Hepatology and Transplantation, Paris, France
| | - Nicolas Chignard
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, UMR_S 938, Centre de Recherche Saint-Antoine, Institute of Cardiometabolism and Nutrition (ICAN), Paris, France
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Rasmussen MK, Balaguer P, Ekstrand B, Daujat-Chavanieu M, Gerbal-Chaloin S. Skatole (3-Methylindole) Is a Partial Aryl Hydrocarbon Receptor Agonist and Induces CYP1A1/2 and CYP1B1 Expression in Primary Human Hepatocytes. PLoS One 2016; 11:e0154629. [PMID: 27138278 PMCID: PMC4854444 DOI: 10.1371/journal.pone.0154629] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 04/16/2016] [Indexed: 12/18/2022] Open
Abstract
Skatole (3-methylindole) is a product of bacterial fermentation of tryptophan in the intestine. A significant amount of skatole can also be inhaled during cigarette smoking. Skatole is a pulmonary toxin that induces the expression of aryl hydrocarbon receptor (AhR) regulated genes, such as cytochrome P450 1A1 (CYP1A1), in human bronchial cells. The liver has a high metabolic capacity for skatole and is the first organ encountered by the absorbed skatole; however, the effect of skatole in the liver is unknown. Therefore, we investigated the impact of skatole on hepatic AhR activity and AhR-regulated gene expression. Using reporter gene assays, we showed that skatole activates AhR and that this is accompanied by an increase of CYP1A1, CYP1A2 and CYP1B1 expression in HepG2-C3 and primary human hepatocytes. Specific AhR antagonists and siRNA-mediated AhR silencing demonstrated that skatole-induced CYP1A1 expression is dependent on AhR activation. The effect of skatole was reduced by blocking intrinsic cytochrome P450 activity and indole-3-carbinole, a known skatole metabolite, was a more potent inducer than skatole. Finally, skatole could reduce TCDD-induced CYP1A1 expression, suggesting that skatole is a partial AhR agonist. In conclusion, our findings suggest that skatole and its metabolites affect liver homeostasis by modulating the AhR pathway.
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Affiliation(s)
- Martin Krøyer Rasmussen
- INSERM, U1183, Institute of Regenerative Medicine and Biotherapy, Montpellier, F-34290, France
- Montpellier University, UMR 1183, Montpellier, F-34203, France
- Department of Food Science, Aarhus University, Foulum, Denmark
- * E-mail:
| | - Patrick Balaguer
- Institut de Recherche en Cancérologie de Montpellier, Montpellier, F-34298, France
| | - Bo Ekstrand
- Department of Food Science, Aarhus University, Foulum, Denmark
| | - Martine Daujat-Chavanieu
- INSERM, U1183, Institute of Regenerative Medicine and Biotherapy, Montpellier, F-34290, France
- CHU Montpellier, Institute of Regenerative Medicine and Biotherapy, Montpellier, F-34290, France
| | - Sabine Gerbal-Chaloin
- INSERM, U1183, Institute of Regenerative Medicine and Biotherapy, Montpellier, F-34290, France
- Montpellier University, UMR 1183, Montpellier, F-34203, France
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35
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Whitfield-Cargile CM, Cohen ND, Chapkin RS, Weeks BR, Davidson LA, Goldsby JS, Hunt CL, Steinmeyer SH, Menon R, Suchodolski JS, Jayaraman A, Alaniz RC. The microbiota-derived metabolite indole decreases mucosal inflammation and injury in a murine model of NSAID enteropathy. Gut Microbes 2016; 7:246-61. [PMID: 27007819 PMCID: PMC4939928 DOI: 10.1080/19490976.2016.1156827] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Non-steroidal anti-inflammatory drugs (NSAIDs) are one of the most frequently used classes of medications in the world. Unfortunately, NSAIDs induce an enteropathy associated with high morbidity and mortality. Although the pathophysiology of this condition involves the interaction of the gut epithelium, microbiota, and NSAIDs, the precise mechanisms by which microbiota influence NSAID enteropathy are unclear. One possible mechanism is that the microbiota may attenuate the severity of disease by specific metabolite-mediated regulation of host inflammation and injury. The microbiota-derived tryptophan-metabolite indole is abundant in the healthy mammalian gut and positively influences intestinal health. We thus examined the effects of indole administration on NSAID enteropathy. Mice (n = 5 per group) were treated once daily for 7 days with an NSAID (indomethacin; 5 mg/kg), indole (20 mg/kg), indomethacin plus indole, or vehicle only (control). Outcomes compared among groups included: microscopic pathology; fecal calprotectin concentration; proportion of neutrophils in the spleen and mesenteric lymph nodes; fecal microbiota composition and diversity; small intestinal mucosal transcriptome; and, fecal tryptophan metabolites. Co-administration of indole with indomethacin: significantly reduced mucosal pathology scores, fecal calprotectin concentrations, and neutrophilic infiltration of the spleen and mesenteric lymph nodes induced by indomethacin; modulated NSAID-induced perturbation of the microbiota, fecal metabolites, and inferred metagenome; and, abrogated a pro-inflammatory gene expression profile in the small intestinal mucosa induced by indomethacin. The microbiota-derived metabolite indole attenuated multiple deleterious effects of NSAID enteropathy, including modulating inflammation mediated by innate immune responses and altering indomethacin-induced shift of the microbiota.
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Affiliation(s)
- Canaan M. Whitfield-Cargile
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Noah D. Cohen
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Robert S. Chapkin
- Department of Nutrition and Food Science, College of Agriculture and Life Sciences, Texas A&M University, College Station, Texas, USA,Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science Center, Texas A&M University, College Station, Texas, USA
| | - Brad R. Weeks
- Department of Veterinary Pathobiology, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Laurie A. Davidson
- Department of Nutrition and Food Science, College of Agriculture and Life Sciences, Texas A&M University, College Station, Texas, USA
| | - Jennifer S. Goldsby
- Department of Nutrition and Food Science, College of Agriculture and Life Sciences, Texas A&M University, College Station, Texas, USA
| | - Carrie L. Hunt
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science Center, Texas A&M University, College Station, Texas, USA
| | - Shelby H. Steinmeyer
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science Center, Texas A&M University, College Station, Texas, USA
| | - Rani Menon
- Department of Chemical Engineering, College of Engineering, Texas A&M University, College Station, Texas, USA
| | - Jan S. Suchodolski
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Arul Jayaraman
- Department of Chemical Engineering, College of Engineering, Texas A&M University, College Station, Texas, USA
| | - Robert C. Alaniz
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M Health Science Center, Texas A&M University, College Station, Texas, USA
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Keren N, Konikoff FM, Paitan Y, Gabay G, Reshef L, Naftali T, Gophna U. Interactions between the intestinal microbiota and bile acids in gallstones patients. ENVIRONMENTAL MICROBIOLOGY REPORTS 2015; 7:874-80. [PMID: 26149537 DOI: 10.1111/1758-2229.12319] [Citation(s) in RCA: 124] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Accepted: 06/26/2015] [Indexed: 05/23/2023]
Abstract
Cholecystectomy, surgical removal of the gallbladder, changes bile flow to the intestine and can therefore alter the bidirectional interactions between bile acids (BAs) and the intestinal microbiota. We quantified and correlated BAs and bacterial community composition in gallstone patients scheduled for cholecystectomy before and after the procedure, using gas-liquid chromatography and 16S rRNA amplicon sequencing, followed by quantitative real-time polymerase chain reaction of the phylum Bacteroidetes. Gallstone patients had higher overall concentrations of faecal BAs and a decreased microbial diversity, accompanied by a reduction in the beneficial genus Roseburia and an enrichment of the uncultivated genus Oscillospira, compared with controls. These two genera may thus serve as biomarkers for symptomatic gallstone formation. Oscillospira was correlated positively with secondary BAs and negatively with primary BAs, while the phylum Bacteroidetes showed an opposite trend. Cholecystectomy resulted in no substantial change in patients' faecal BAs. However, bacterial composition was significantly altered, with a significant increase in the phylum Bacteroidetes. Given that cholecystectomy has been associated with a higher risk of colorectal cancer and that members of the Bacteroidetes are increased in that disease, microbial consequences of cholecystectomy should be further explored.
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Affiliation(s)
- Nirit Keren
- Department of Gastroenterology and Hepatology, Meir Medical Center, Kfar Saba, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Fred M Konikoff
- Department of Gastroenterology and Hepatology, Meir Medical Center, Kfar Saba, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Yossi Paitan
- Clinical Microbiology Laboratory, Meir Medical Center, Kfar Saba, Israel
| | - Gila Gabay
- Department of Gastroenterology and Hepatology, Meir Medical Center, Kfar Saba, Israel
| | - Leah Reshef
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Timna Naftali
- Department of Gastroenterology and Hepatology, Meir Medical Center, Kfar Saba, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Uri Gophna
- Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
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Sturbelle RT, Avila LFDCD, Roos TB, Borchardt JL, de Cássia dos Santos da Conceição R, Dellagostin OA, Leite FPL. The role of quorum sensing in Escherichia coli (ETEC) virulence factors. Vet Microbiol 2015; 180:245-52. [DOI: 10.1016/j.vetmic.2015.08.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 08/17/2015] [Accepted: 08/18/2015] [Indexed: 11/30/2022]
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Yoshifuji A, Wakino S, Irie J, Tajima T, Hasegawa K, Kanda T, Tokuyama H, Hayashi K, Itoh H. GutLactobacillusprotects against the progression of renal damage by modulating the gut environment in rats. Nephrol Dial Transplant 2015; 31:401-12. [DOI: 10.1093/ndt/gfv353] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Accepted: 09/08/2015] [Indexed: 02/06/2023] Open
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Sung HJ, Paik CN, Chung WC, Lee KM, Yang JM, Choi MG. Small Intestinal Bacterial Overgrowth Diagnosed by Glucose Hydrogen Breath Test in Post-cholecystectomy Patients. J Neurogastroenterol Motil 2015; 21:545-51. [PMID: 26351251 PMCID: PMC4622137 DOI: 10.5056/jnm15020] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Revised: 05/12/2015] [Accepted: 05/15/2015] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND/AIMS Patients undergoing cholecystectomy may have small intestinal bacterial overgrowth (SIBO). We investigated the prevalence and characteristics of SIBO in patients with intestinal symptoms following cholecystectomy. METHODS Sixty-two patients following cholecystectomy, 145 with functional gastrointestinal diseases (FGIDs), and 30 healthy controls undergoing hydrogen (H2)-methane (CH4) glucose breath test (GBT) were included in the study. Before performing GBT, all patients were interrogated using bowel symptom questionnaire. The positivity to GBT indicating the presence of SIBO, gas types and bowel symptoms were surveyed. RESULTS Post-cholecystectomy patients more often had SIBO as evidenced by a positive (+) GBT than those with FGID and controls (29/62, 46.8% vs 38/145, 26.2% vs 4/30, 13.3%, respectively; P = 0.010). In the gas types, the GBT (H2) + post-cholecystectomy patients was significantly higher than those in FGIDs patients (P = 0.017). Especially, positivity to fasting GBT (H2) among the GBT (H2)+ post-cholecystectomy patients was high, as diagnosed by elevated fasting H2 level. The GBT+ group had higher symptom scores of significance or tendency in abdominal discomfort, bloating, chest discomfort, early satiety, nausea, and tenesmus than those of the GBT negative group. The status of cholecystectomy was the only significant independent factor for predicting SIBO. CONCLUSIONS The SIBO with high levels of baseline H2 might be the important etiologic factor of upper GI symptoms for post-cholecystectomy patients.
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Affiliation(s)
- Hea Jung Sung
- Division of Gastroenterology, Department of Internal Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Chang-Nyol Paik
- Division of Gastroenterology, Department of Internal Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Woo Chul Chung
- Division of Gastroenterology, Department of Internal Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Kang-Moon Lee
- Division of Gastroenterology, Department of Internal Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Jin-Mo Yang
- Division of Gastroenterology, Department of Internal Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Myung-Gyu Choi
- Division of Gastroenterology, Department of Internal Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Hubbard TD, Murray IA, Perdew GH. Indole and Tryptophan Metabolism: Endogenous and Dietary Routes to Ah Receptor Activation. Drug Metab Dispos 2015; 43:1522-35. [PMID: 26041783 PMCID: PMC4576673 DOI: 10.1124/dmd.115.064246] [Citation(s) in RCA: 416] [Impact Index Per Article: 46.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 06/02/2015] [Indexed: 12/31/2022] Open
Abstract
The aryl hydrocarbon receptor (AHR) is a ligand-activated transcription factor recognized for its role in xenobiotic metabolism. The physiologic function of AHR has expanded to include roles in immune regulation, organogenesis, mucosal barrier function, and the cell cycle. These functions are likely dependent upon ligand-mediated activation of the receptor. High-affinity ligands of AHR have been classically defined as xenobiotics, such as polychlorinated biphenyls and dioxins. Identification of endogenous AHR ligands is key to understanding the physiologic functions of this enigmatic receptor. Metabolic pathways targeting the amino acid tryptophan and indole can lead to a myriad of metabolites, some of which are AHR ligands. Many of these ligands exhibit species selective preferential binding to AHR. The discovery of specific tryptophan metabolites as AHR ligands may provide insight concerning where AHR is activated in an organism, such as at the site of inflammation and within the intestinal tract.
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Affiliation(s)
- Troy D Hubbard
- Graduate Program in Biochemistry, Microbiology, and Molecular Biology (T.D.H.), and Center for Molecular Toxicology and Carcinogenesis and the Department of Veterinary and Biomedical Sciences (T.D.H., I.A.M., G.H.P)., Pennsylvania State University, University Park, Pennsylvania
| | - Iain A Murray
- Graduate Program in Biochemistry, Microbiology, and Molecular Biology (T.D.H.), and Center for Molecular Toxicology and Carcinogenesis and the Department of Veterinary and Biomedical Sciences (T.D.H., I.A.M., G.H.P)., Pennsylvania State University, University Park, Pennsylvania
| | - Gary H Perdew
- Graduate Program in Biochemistry, Microbiology, and Molecular Biology (T.D.H.), and Center for Molecular Toxicology and Carcinogenesis and the Department of Veterinary and Biomedical Sciences (T.D.H., I.A.M., G.H.P)., Pennsylvania State University, University Park, Pennsylvania
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Steinmeyer S, Lee K, Jayaraman A, Alaniz RC. Microbiota metabolite regulation of host immune homeostasis: a mechanistic missing link. Curr Allergy Asthma Rep 2015; 15:24. [PMID: 26139332 DOI: 10.1007/s11882-015-0524-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Metazoans predominantly co-exist with symbiotic microorganisms called the microbiota. Metagenomic surveys of the microbiota reveal a diverse ecosystem of microbes particularly in the gastrointestinal (GI) tract. Perturbations in the GI microbiota in higher mammals (i.e., humans) are linked to diseases with variegated symptomology including inflammatory bowel disease, asthma, and auto-inflammatory disorders. Indeed, studies using germ-free mice (lacking a microbiota) confirm that host development and homeostasis are dependent on the microbiota. A long-known key feature of the GI tract microbiota is metabolizing host indigestible dietary matter for maximum energy extraction; however, host signaling pathways are greatly influenced by the microbiota as well. In line with these observations, recent research has revealed that metabolites produced strictly by select microbiota members are mechanistic regulators of host cell functions. In this review, we discuss two major classes of microbiota-produced metabolites: short-chain fatty acids and tryptophan metabolites. We describe the known important roles for these metabolites in shaping host immunity and comment on the current status and future directions for microbiota metabolomics research.
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Affiliation(s)
- S Steinmeyer
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX, 77843, USA,
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A rapid and specific method for the detection of indole in complex biological samples. Appl Environ Microbiol 2015; 81:8093-7. [PMID: 26386049 DOI: 10.1128/aem.02787-15] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 09/10/2015] [Indexed: 12/22/2022] Open
Abstract
Indole, a bacterial product of tryptophan degradation, has a variety of important applications in the pharmaceutical industry and is a biomarker in biological and clinical specimens. Yet, specific assays to quantitate indole are complex and require expensive equipment and a high level of training. Thus, indole in biological samples is often estimated using the simple and rapid Kovács assay, which nonspecifically detects a variety of commonly occurring indole analogs. We demonstrate here a sensitive, specific, and rapid method for measuring indole in complex biological samples using a specific reaction between unsubstituted indole and hydroxylamine. We compared the hydroxylamine-based indole assay (HIA) to the Kovács assay and confirmed that the two assays are capable of detecting microgram amounts of indole. However, the HIA is specific to indole and does not detect other naturally occurring indole analogs. We further demonstrated the utility of the HIA in measuring indole levels in clinically relevant biological materials, such as fecal samples and bacterial cultures. Mean and median fecal indole concentrations from 53 healthy adults were 2.59 mM and 2.73 mM, respectively, but varied widely (0.30 mM to 6.64 mM) among individuals. We also determined that enterotoxigenic Escherichia coli strain H10407 produces 3.3 ± 0.22 mM indole during a 24-h period in the presence of 5 mM tryptophan. The sensitive and specific HIA should be of value in a variety of settings, such as the evaluation of various clinical samples and the study of indole-producing bacterial species in the gut microbiota.
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Indole: a signaling molecule or a mere metabolic byproduct that alters bacterial physiology at a high concentration? J Microbiol 2015; 53:421-8. [PMID: 26115989 DOI: 10.1007/s12275-015-5273-3] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 06/17/2015] [Accepted: 06/18/2015] [Indexed: 10/23/2022]
Abstract
Indole is an organic compound that is widespread in microbial communities inhabiting diverse habitats, like the soil environment and human intestines. Measurement of indole production is a traditional method for the identification of microbial species. Escherichia coli can produce millimolar concentrations of indole in the stationary growth phase under nutrient-rich conditions. Indole has received considerable attention because of its remarkable effects on various biological functions of the microbial communities, for example, biofilm formation, motility, virulence, plasmid stability, and antibiotic resistance. Indole may function as an intercellular signaling molecule, like a quorum-sensing signal. Nevertheless, a receptor system for indole and the function of this compound in coordinated behavior of a microbial population (which are requirements for a true signaling molecule) have not yet been confirmed. Recent findings suggest that a long-known quorum-sensing regulator, E. coli's SdiA, cannot recognize indole and that this compound may simply cause membrane disruption and energy reduction, which can lead to various changes in bacterial physiology including unstable folding of a quorum-sensing regulator. Indole appears to be responsible for acquisition of antibiotic resistance via the formation of persister cells and activation of an exporter. This review highlights and summarizes the current knowledge about indole as a multitrophic molecule among bacteria, together with recently identified new avenues of research.
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Dong JH, Ye S, Duan WD, Ji WB, Liang YR. Feasibility of liver graft procurement with donor gallbladder preservation in living donor liver transplantation. Hepatol Int 2015; 9:603-11. [PMID: 25976500 DOI: 10.1007/s12072-015-9628-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Accepted: 03/30/2015] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Cholecystectomy is routinely performed at most transplant centers during living donor liver transplantation (LDLT). This study was performed to evaluate the feasibility of liver graft procurement with donor gallbladder preservation in LDLT. METHODS Eighty-nine LDLTs (from June 2006 to Dec 2012) were retrospectively analyzed at our hospital. The surgical approach for liver graft procurement with donor gallbladder preservation was assessed, and the anatomy of the cystic artery, the morphology and contractibility of the preserved gallbladder, postoperative symptoms, and vascular and biliary complications were compared among donors with or without gallbladder preservation. RESULTS Twenty-eight donors (15 right and 13 left-liver grafts) successfully underwent liver graft procurement with gallbladder preservation. Among the 15 right lobectomy donors, for 12 cases (80.0 %) the cystic artery originated from right hepatic artery. From the left hepatic artery and proper hepatic artery accounted for 6.7 % (1/15), respectively. Postoperative symptoms among these 28 donors were slight, although donors with cholecystectomy often complained of fatty food aversion, dyspepsia, and diarrhea during an average follow-up of 58.6 (44-78) months. The morphology and contractibility of the preserved gallbladders were comparable with normal status; the rate of contraction was 53.8 and 76.7 %, respectively, 30 and 60 min after ingestion of a fatty meal. Biliary and vascular complications among donors and recipients, irrespective of gallbladder preservation, were not significantly different. CONCLUSIONS These data suggest that for donors compliant with anatomical requirements, liver graft procurement with gallbladder preservation for the donor is feasible and safe. The preserved gallbladder was assessed as functioning well and postoperative symptoms as a result of cholecystectomy were significantly reduced during long-term follow-up.
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Affiliation(s)
- Jia-Hong Dong
- Hospital and Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxin Road, Beijing, 100853, China
| | - Sheng Ye
- Hospital and Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxin Road, Beijing, 100853, China.
| | - Wei-Dong Duan
- Hospital and Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxin Road, Beijing, 100853, China
| | - Wen-Bing Ji
- Hospital and Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxin Road, Beijing, 100853, China
| | - Yu-Rong Liang
- Hospital and Institute of Hepatobiliary Surgery, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxin Road, Beijing, 100853, China
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Involvement of the gut chemosensory system in the regulation of colonic anion secretion. BIOMED RESEARCH INTERNATIONAL 2015; 2015:403919. [PMID: 25866781 PMCID: PMC4383346 DOI: 10.1155/2015/403919] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 09/09/2014] [Indexed: 12/26/2022]
Abstract
The primary function of the gastrointestinal (GI) tract is the extraction of nutrients from the diet. Therefore, the GI tract must possess an efficient surveillance system that continuously monitors the luminal content for beneficial or harmful compounds. Recent studies have shown that specialized cells in the intestinal lining can sense changes in this content. These changes directly influence fundamental GI processes such as secretion, motility, and local blood flow via hormonal and/or neuronal pathways. Until recently, most studies examining the control of ion transport in the colon have focused on neural and hormonal regulation. However, study of the regulation of gut function by the gut chemosensory system has become increasingly important, as failure of this system causes dysfunctions in host homeostasis, as well as functional GI disorders. Furthermore, regulation of ion transport in the colon is critical for host defense and for electrolytes balance. This review discusses the role of the gut chemosensory system in epithelial transport, with a particular emphasis on the colon.
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Bacterial secretions of nonpathogenic Escherichia coli elicit inflammatory pathways: a closer investigation of interkingdom signaling. mBio 2015; 6:e00025. [PMID: 25759496 PMCID: PMC4453519 DOI: 10.1128/mbio.00025-15] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
UNLABELLED There have been many studies on the relationship between nonpathogenic bacteria and human epithelial cells; however, the bidirectional effects of the secretomes (secreted substances in which there is no direct bacterium-cell contact) have yet to be fully investigated. In this study, we use a transwell model to explore the transcriptomic effects of bacterial secretions from two different nonpathogenic Escherichia coli strains on the human colonic cell line HCT-8 using next-generation transcriptome sequencing (RNA-Seq). E. coli BL21 and W3110, while genetically very similar (99.1% homology), exhibit key phenotypic differences, including differences in their production of macromolecular structures (e.g., flagella and lipopolysaccharide) and in their secretion of metabolic byproducts (e.g., acetate) and signaling molecules (e.g., quorum-sensing autoinducer 2 [AI-2]). After analysis of differential epithelial responses to the respective secretomes, this study shows for the first time that a nonpathogenic bacterial secretome activates the NF-κB-mediated cytokine-cytokine receptor pathways while also upregulating negative-feedback components, including the NOD-like signaling pathway. Because of AI-2's relevance as a bacterium-bacterium signaling molecule and the differences in its secretion rates between these strains, we investigated its role in HCT-8 cells. We found that the expression of the inflammatory cytokine interleukin 8 (IL-8) responded to AI-2 with a pattern of rapid upregulation before subsequent downregulation after 24 h. Collectively, these data demonstrate that secreted products from nonpathogenic bacteria stimulate the transcription of immune-related biological pathways, followed by the upregulation of negative-feedback elements that may serve to temper the inflammatory response. IMPORTANCE The symbiotic relationship between the microbiome and the host is important in the maintenance of human health. There is a growing need to further understand the nature of these relationships to aid in the development of homeostatic probiotics and also in the design of novel antimicrobial therapeutics. To our knowledge, this is the first global-transcriptome study of bacteria cocultured with human epithelial cells in a model to determine the transcriptional effects of epithelial cells in which epithelial and bacterial cells are allowed to "communicate" with each other only through diffusible small molecules and proteins. By beginning to demarcate the direct and indirect effects of bacteria on the gastrointestinal (GI) tract, two-way interkingdom communication can potentially be mediated between host and microbe.
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Caimari A, Puiggròs F, Suárez M, Crescenti A, Laos S, Ruiz JA, Alonso V, Moragas J, del Bas JM, Arola L. The intake of a hazelnut skin extract improves the plasma lipid profile and reduces the lithocholic/deoxycholic bile acid faecal ratio, a risk factor for colon cancer, in hamsters fed a high-fat diet. Food Chem 2015; 167:138-44. [DOI: 10.1016/j.foodchem.2014.06.072] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Revised: 04/30/2014] [Accepted: 06/16/2014] [Indexed: 11/15/2022]
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Bacterial metabolite indole modulates incretin secretion from intestinal enteroendocrine L cells. Cell Rep 2014; 9:1202-8. [PMID: 25456122 PMCID: PMC4308618 DOI: 10.1016/j.celrep.2014.10.032] [Citation(s) in RCA: 347] [Impact Index Per Article: 34.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 09/22/2014] [Accepted: 10/10/2014] [Indexed: 12/25/2022] Open
Abstract
It has long been speculated that metabolites, produced by gut microbiota, influence host metabolism in health and diseases. Here, we reveal that indole, a metabolite produced from the dissimilation of tryptophan, is able to modulate the secretion of glucagon-like peptide-1 (GLP-1) from immortalized and primary mouse colonic L cells. Indole increased GLP-1 release during short exposures, but it reduced secretion over longer periods. These effects were attributed to the ability of indole to affect two key molecular mechanisms in L cells. On the one hand, indole inhibited voltage-gated K+ channels, increased the temporal width of action potentials fired by L cells, and led to enhanced Ca2+ entry, thereby acutely stimulating GLP-1 secretion. On the other hand, indole slowed ATP production by blocking NADH dehydrogenase, thus leading to a prolonged reduction of GLP-1 secretion. Our results identify indole as a signaling molecule by which gut microbiota communicate with L cells and influence host metabolism. Bacterial metabolite indole modulates secretion of incretin peptide GLP-1 Indole widens the width of action potentials fired by L cells and elevates GLP-1 Prolonged exposure to indole inhibits ATP production and thus GLP-1 secretion
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Lee JH, Kim YG, Baek KH, Cho MH, Lee J. The multifaceted roles of the interspecies signalling molecule indole inAgrobacterium tumefaciens. Environ Microbiol 2014; 17:1234-44. [DOI: 10.1111/1462-2920.12560] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 07/02/2014] [Indexed: 12/24/2022]
Affiliation(s)
- Jin-Hyung Lee
- School of Chemical Engineering; Yeungnam University; Gyeongsan 712-749 Korea
| | - Yong-Guy Kim
- School of Chemical Engineering; Yeungnam University; Gyeongsan 712-749 Korea
| | - Kwang-Hyun Baek
- School of Biotechnology; Yeungnam University; Gyeongsan 712-749 Korea
| | - Moo Hwan Cho
- School of Chemical Engineering; Yeungnam University; Gyeongsan 712-749 Korea
| | - Jintae Lee
- School of Chemical Engineering; Yeungnam University; Gyeongsan 712-749 Korea
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The Dynamic Interactions between Salmonella and the Microbiota, within the Challenging Niche of the Gastrointestinal Tract. INTERNATIONAL SCHOLARLY RESEARCH NOTICES 2014; 2014:846049. [PMID: 27437481 PMCID: PMC4897363 DOI: 10.1155/2014/846049] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 05/14/2014] [Indexed: 12/25/2022]
Abstract
Understanding how Salmonella species establish successful infections remains a foremost research priority. This gastrointestinal pathogen not only faces the hostile defenses of the host's immune system, but also faces fierce competition from the large and diverse community of microbiota for space and nutrients. Salmonella have solved these challenges ingeniously. To jump-start growth, Salmonella steal hydrogen produced by the gastrointestinal microbiota. Type 3 effector proteins are subsequently secreted by Salmonella to trigger potent inflammatory responses, which generate the alternative terminal electron acceptors tetrathionate and nitrate. Salmonella exclusively utilize these electron acceptors for anaerobic respiration, permitting metabolic access to abundant substrates such as ethanolamine to power growth blooms. Chemotaxis and flagella-mediated motility enable the identification of nutritionally beneficial niches. The resulting growth blooms also promote horizontal gene transfer amongst the resident microbes. Within the gastrointestinal tract there are opportunities for chemical signaling between host cells, the microbiota, and Salmonella. Host produced catecholamines and bacterial autoinducers form components of this chemical dialogue leading to dynamic interactions. Thus, Salmonella have developed remarkable strategies to initially shield against host defenses and to transiently compete against the intestinal microbiota leading to successful infections. However, the immunocompetent host is subsequently able to reestablish control and clear the infection.
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