Abstract

The content of histamine (by the reaction with orthophthalic aldehyde) and serotonin (by Falk's reaction) in mesenteric mast cells of normal and germfree rats was determined microspectrometrically. Reserpine (10 mg/kg, intramuscularly) was shown not to change the histamine content, whereas the serotonin content was reduced by 50%. Injection of cyclic AMP (3.5 mg/kg, intraperitoneally) caused the serotonin content to be increased by 80% and the histamine content by 280–320%.

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