Penetration of M cells and destruction of Peyer's patches by Yersinia enterocolitica: an ultrastructural and histological study

Journal of Medical Microbiology
I B Autenrieth, R Firsching

Abstract

Yersinia enterocolitica is enteropathogenic for man and rodents. Previous studies provided evidence that Y. enterocolitica invades the lymphoid follicles of the Peyer's patches (PP) of the small intestine. In this study Y. enterocolitica-induced tissue alterations of the follicle-associated epithelium (FAE) and the underlying PP tissue were analysed by scanning (SEM) and transmission electron microscopy (TEM) as well as by conventional histological examination. For this purpose, an experimental mouse infection model including orogastric infections as well as ileal loop experiments were used. A rapid and selective colonisation of the FAE after orogastric yersinia infection was observed by SEM. TEM studies confirmed that Y. enterocolitica adhered closely to the FAE including M cells and enterocytes. Histological studies and TEM revealed that Y. enterocolitica selectively invaded the PP via M cells but not via other cells of the FAE. One day after Y. enterocolitica infection the FAE was altered and small micro-abscesses comprising yersiniae expressing the major outer-membrane protein YadA were observed immediately beneath the FAE. Adjacent villi were dilated from lymphangiectasis and transmigrating polymorphonuclear leucocytes (PM...Continue Reading

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