Publication Date:
1999-07-27
Description:
Enteropathogenic Escherichia coli (EPEC) cells adhere to gut epithelial cells through intimin alpha: the ligand for a bacterially derived epithelial transmembrane protein called the translocated intimin receptor. Citrobacter rodentium colonizes the mouse colon in a similar fashion and uses a different intimin: intimin beta. Intimin alpha was found to costimulate submitogenic signals through the T cell receptor. Dead intimin beta+ C. rodentium, intimin alpha-transfected C. rodentium or E. coli strain K12, and EPEC induced mucosal hyperplasia identical to that caused by C. rodentium live infection, as well as a massive T helper cell-type 1 immune response in the colonic mucosa. Mutation of cysteine-937 of intimin to alanine reduced costimulatory activity in vitro and prevented immunopathology in vivo. The mucosal changes elicited by C. rodentium were interferon-gamma-dependent. Immunopathology induced by intimin enables the bacteria to promote conditions that are favorable for increased microbial colonization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Higgins, L M -- Frankel, G -- Connerton, I -- Goncalves, N S -- Dougan, G -- MacDonald, T T -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 1999 Jul 23;285(5427):588-91.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Paediatric Gastroenterology, St. Bartholomews and the Royal London School of Medicine and Dentistry, London EC1A 7BE, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10417389" target="_blank"〉PubMed〈/a〉
Keywords:
*Adhesins, Bacterial
;
Animals
;
Bacterial Adhesion
;
Bacterial Outer Membrane Proteins/pharmacology/*physiology
;
*Carrier Proteins
;
Citrobacter/*pathogenicity
;
Colitis/immunology/*microbiology/pathology
;
Colon/immunology/microbiology/*pathology
;
Cytokines/biosynthesis/genetics
;
Enterobacteriaceae Infections/immunology/*microbiology/pathology
;
Escherichia coli/pathogenicity
;
*Escherichia coli Proteins
;
Hyperplasia
;
Interferon-gamma/physiology
;
Intestinal Mucosa/immunology/microbiology/pathology
;
Ligands
;
Lymphocyte Activation
;
Mice
;
Mice, Inbred BALB C
;
Receptors, Cell Surface/metabolism
;
T-Lymphocytes/immunology
;
Th1 Cells/*immunology
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
Permalink