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Parameters of intestinal inflammation in mice given graded infections of the nematode Trichinella spiralis

Published online by Cambridge University Press:  12 April 2024

M.S. Dehlawi  and
D. Wakelin
M.S. Dehlawi
Affiliation:
School of Life and Environmental Sciences, University of Nottingham, Nottingham, NG7 2RD, UK
D. Wakelin*
Affiliation:
School of Life and Environmental Sciences, University of Nottingham, Nottingham, NG7 2RD, UK
*
*Author for correspondence Fax: 44 115 9513252 E-mail: [email protected]
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Abstract

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Four parameters of the intestinal inflammatory response (numbers of mucosal mast cells (MMC) and Paneth cells, villus:crypt ratios and mitotic figures) were measured in mice exposed to varying doses of infective larvae of Trichinella spiralis.The aim of the experiments was to determine whether generation of these components of inflammation required a threshold level of infection and whether, once triggered, inflammation became pan-mucosal. Near maximal MMC and Paneth cell responses were elicited even with infections as low as 35 larvae; changes in villus:crypt ratios and in mitotic indices also occurred at this level of infection, but were progressively greater with increasing levels of infection. In all infected mice, including those infected with 35 larvae, MMC and Paneth cell responses extended over most of the small intestine. These data are interpreted as showing: (i) that the intestinal mucosa is highly responsive to T. spiralis infection; (ii) that once triggered, components of the inflammatory response are amplified by T cell-dependent mechanisms, becoming pan-mucosal; and (iii) that MMC and Paneth cell responses, which require cell division and differentiation, become maximal at a lower infection threshold than changes in the villus:crypt ratio or in mitotic indices, which directly reflect increased rates of division in crypt cells.

Type
Review Article
Information
Journal of Helminthology , Volume 76 , Issue 2 , June 2002 , pp. 113 - 117
Copyright
Copyright © Cambridge University Press 2002

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