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Effect of endotoxin on the peritoneal mast cells in mice.

Endotoxin administered intraperitoneally has been found to decrease the absolute and relative number of the peritoneal mast cells in mice. The number of peritoneal mast cells showed a dose-dependent biphasic response to endotoxin. Maximal and more consistent decrease in the peritoneal mast cell count was observed at about 24 h and lasted for at least 4 days. Mast cell damage also occurred. The possible mechanism of this phenomenon is discussed.