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Effect of Anatomical Distribution of Mast Cells on Their Defense Function Against Bacterial Infections: Demonstration Using Partially Mast Cell-deficient Tg/tg Mice

Overview
Journal J Exp Med
Date 2003 May 29
PMID 12771178
Citations 12
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Abstract

Mast cells were depleted in the peritoneal cavity of WBB6F1-tg/tg mice that did not express a transcription factor, MITF. When acute bacterial peritonitis was induced in WBB6F1-+/+, WBB6F1-W/Wv, and WBB6F1-tg/tg mice, the proportion of surviving WBB6F1-+/+ mice was significantly higher than that of surviving WBB6F1-W/Wv or WBB6F1-tg/tg mice. The poor survival of WBB6F1-W/Wv and WBB6F1-tg/tg mice was attributed to the deficient influx of neutrophils into the peritoneal cavity. The injection of cultured mast cells (CMCs) derived from WBB6F1-+/+ mice normalized the neutrophil influx and reduced survival rate in WBB6F1-W/Wv mice, but not in WBB6F1-tg/tg mice. This was not attributable to a defect of neutrophils because injection of TNF-alpha increased the neutrophil influx and survival rate in both WBB6F1-W/Wv and WBB6F1-tg/tg mice. Although WBB6F1-+/+ CMCs injection normalized the number of mast cells in both the peritoneal cavity and mesentery of WBB6F1-W/Wv mice, it normalized the number of mast cells only in the peritoneal cavity of WBB6F1-tg/tg mice. Mast cells within the mesentery or mast cells in the vicinity of blood vessels appeared to play an important role against the acute bacterial peritonitis. WBB6F1-tg/tg mice may be useful for studying the effect of anatomical distribution of mast cells on their antiseptic function.

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