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To examine the fate of the injected peritoneal mast cells (PMCs), we injected PMCs (500 or 10^5) derived from WBB6F1-green fluorescent protein(GFP) mice into stomach wall of WBB6F1-W/W^v mice. When 500 PMCs were injected, the proportion of alcian blue (AB)^+ mast cells to GFP^+ mast cells in the muscle was 25.0% on day 1, but decreased to 0.9% on day 7. Then, it increased to 98.2% on day 35. In contrast, GFP^+ mast cells in the mucosa were not detectable on day 1, 3, and 7 after injection. On day 35, the proportion of AB^+ mast cells to GFP^+ mast cells in the mucosa was 97.0%. When 10^5 PMCs were injected, the proportion of AB^+ mast cells to GFP^+ mast cells in the muscle was more than 88.2%, and that in the mucosa was more than 86.3% from day 1 through 35 after injection. These results indicated that percentage of degranulation on day 1, 3, 7, 14 after injection of 500 PMCs was significantly higher than that after injection of 10^5 PMCs. Futhermore, when 500 PMCs were injected, protease expression phenotypes of PMCs changed from day 14 after injection. When 10^5 PMCs were injected, protease expression phenotype of PMCs did not change after injection. Such degranulated PMCs may acquire the new phenotype and adapt the new tissue.
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