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Mycobacterium avium subspecies paratuberculosis infects and multiplies in enteric glial cells

World Journal of Gastroenterology 2007年第43期13卷 5731-5735页

作者： Leonardo A Sechi Anne Ruehl Niyaz Ahmed Donatella Usai daniela paccagnini Giovanna E Felis Stefania Zanetti Department of Biomedical Sciences Microbiology Section University of Sassari Viale S Pietro 43/B Sassari 07100 Italy International Society of Genetic and Evolutionary Microbiology Working Group on Mycobacterial Disease Sassari Italy Department of Human Biology Technical University of Munich Hochfeldweg 2 D-85350 Freising-Weihenstephan Germany International Society of Genetic and Evolutionary Microbiology Working Group on Mycobacterial Disease Sassari Italy Pathogen Evolution Group Centre for DNA Fingerprinting and Diagnostics Hyderabad India Department of Biomedical Sciences Microbiology Section University of Sassari Viale S Pietro 43/B Sassari 07100 Italy

AIM: To establish the role of enteric glial cells during infection with Mycobacterium avium subspecies paratuberculosis (MAP) in Crohn's disease. METHODS: In order to establish the role of enteric glial cells during infection with M. avium subspecies paratuberculosis (MAP) in Crohn's disease, Map adhesion experiments on enteric glial cells were performed as well as expression analysis of Map sigma factors during infection. RESULTS: In this study, for the first time, we found a high affinity of MAP to enteric glial cells and we analyzed the expression of MAP sigma factors under different conditions of growth. CONCLUSION: The fact that Map showed a high affinity to the glial cells raises concerns about the complicated etiology of the Crohn's disease. Elucidation of the mechanisms whereby inflammation alters enteric neural control of gut functions may lead to novel treatments for Crohn's disease.

关键词： Mycobacterium avium subspecies Paratuber-culosis Enteric glial cells Inflammatory bowel diseases Crohn's disease Sigma factors expression

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Relationship between Crohn’s disease, infection with Mycobacterium avium subspecies paratuberculosis and SLC11A1 gene polymorphisms in Sardinian patients

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World Journal of Gastroenterology 2006年第44期12卷 7161-7164页

作者： Leonardo A Sechi Maria Gazouli Lee E Sieswerda Paola Molicotti Niyaz Ahmed John Ikonomopoulos Antonio M Scanu daniela paccagnini Stefania Zanetti Dipartimento di Scienze Biomediche Sezionedi Microbiologia Sperimentale e Clinica Università degli studi diSassari Viale S. Pietro 43/B Sassari 07100 Italy Stefania Zanetti Daniela Paccagnini ISOGEM International Society of Genetic and Evolutionary Microbiology Working Group on Mycobacterial disease. Sassari Italy Department of Biology School of Medicine University of Athens Athens Greece Thunder Bay District Health Unit 999 Balmoral Street Thunder Bay Ontario Canada Dipartimento di Scienze Biomediche Sezionedi Microbiologia Sperimentale e Clinica Università degli studi diSassari Viale S. Pietro 43/B Sassari 07100 Italy Stefania Zanetti Daniela Paccagnini ISOGEM International Society of Genetic and Evolutionary Microbiology Working Group on Mycobacterial disease. Sassari Italy Pathogen Evolution Group Centre for DNAFingerprinting and Diagnostics Hyderabad India Agricultural University of Athens Department of Anatomy-Physiology Faculty of Animal ScienceAthens Greece Clinica Chirurgica Università degli studi diSassari Viale S. Pietro 07100 Sassari Italy

AIM： To study the association between Crohn＇s disease （CD）, Mycobacterium avium subspecies paratubercuolsis （MAP）, and genetic factors by examining the role of natural resistance-associated macrophage protein 1 （NRAMP1） gene polymorphisms （now SLCllA1） in Sardinian patients with CD and controls. METHODS： Thirty-seven CD patients and 34 controls with no inflammatory bowel disease （IBD） were recruited at the University of Sassari after giving written consent. Six SCL11A1 polymorphisms previously reported to be the most significantly associated with IBD were searched. M, pafatubefculosis was identified by IS900 PCR and sequencing. Logistic regression was used to calculate odds ratios （OR） for the associations among CD, presence of MAP, and 6 loci described above.＇ RESULTS： For the first time, a strong association was observed between polymorphisms at NRAMP1 locus 823C/T and CD. While CD was strongly associated with both NRAMP1 and MAP, NRAMP1 polymorphisms and MAP themselves were not correlated. CONCLUSION： Combined with previous work on the NOD2/CARD15 gene, it is clear that the interplay of genetic, infectious, and immunologic factors in the etiology of CD is complex.

关键词： Mycobacterium avium subspecies paratuber- culosis Crohn's disease SCLllA1 polymorphisms

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