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American Journal of Pathology, Vol 150, 1373-1382, Copyright © 1997 by American Society for Investigative Pathology

REGULAR ARTICLES

Expression of mast-cell-specific proteases in tissues of mice studied by in situ hybridization

T Jippo, K Tsujino, HM Kim, DK Kim, YM Lee, Y Nawa and Y Kitamura
Department of Pathology, Osaka University Medical School, Japan.

The protease mRNA expression phenotype of individual mast cells was studied by in situ hybridization. Mouse mast cell protease (MMCP)-2 mRNA was expressed by mast cells located in the mucosa of the stomach of WB(-)+/+ and (WB x C57BL/6)F1(-)+/+ (hereafter WBB6F1(-)+/+) mice but not by mast cells in the same tissue of C57BL/ 6(-)+/+ mice. Even in the stomach of WBB6F1(-)+/+ mice, mast cells located in the muscularis propria did not express MMCP-2 mRNA. The mRNAs of MMCP-4 and mouse mast cell carboxypeptidase A were not expressed by mast cells in the stomach mucosa of untreated WBB6F1(-)+/+ mice but were expressed after the infection of Strongyloides venezuelensis. We examined whether MMCP-2 mRNA expression varied by changing environments of mast cells. Cultured mast cells of WBB6F1(-)+/+ mice that expressed MMCP-2 mRNA were transplanted into the stomach wall of genetically mast-cell- deficient WBB6F1(-)W/Wv mice. Mast cells that appeared in the mucosa expressed the MMCP-2 mRNA, but mast cells that appeared in the muscularis propria did not, indicating the adaptation of cultured mast cells into a new environment. In contrast to cultured mast cells, peritoneal mast cells of WBB6F1(-)+/+ mice that expressed MMCP-2 mRNA as well did not adapt to the muscularis propria of WBB6F(1)-W/Wv mice. The MMCP-2 mRNA remained to be expressed after the settlement in either the mucosa or the muscularis propria. Furthermore, the peritoneal mast cells did not change the MMCP-4 and MMCP-6 mRNA expression phenotype after the settlement in either the mucosa or the muscularis propria of WBB6F(1)-W/Wv mice. The present result indicated that both intracellular factors such as strain specificity and source of mast cells and extracellular factors such as tissue specificity and helminth infection influenced the protease expression phenotypes.

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