Histamine Release in vitro: Inhibition by Catecholamines and Methylxanthines

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Abstract
Methylxanthines and catecholamines both inhibit antigenically induced histamine release from human leukocytes. They act synergistically to inhibit the reaction, but must be present when antigen is added; preincubation is not effective. Since both increase cellular levels of cyclic 3′,5′-adenosine monophosphate it is postulated that this compound plays a role in the regulation of allergic histamine release.

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