CYCLIC AMP AND ALLERGIC HISTAMINE RELEASE. INFLUENCE OF METHYLXANTHINES ON RAT MAST CELLS

Abstract
Both isobutylmethylxanthine and theophylline increased the level of cyclic[c]AMP in rat mast cells. Theophylline reduced the allergic histamine release, whereas isobutylmethylxanthine caused a pronounced potentiation of the histamine release. The hypothesis of an inverse relationship between the level of cAMP in mast cells and histamine release is inadequate.
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