Abstract
Cultured rat Kupffer cells synthesize and release platelet-activating factor (PAF) when stimulated with calcium ionophore A23187. The production of PAF is concentration- and time-dependent and, based upon [3H]serotonin release assays, approx. 1.0 pmol of PAF is formed per 8 x 10(6) cells during 10 min of ionophore stimulation. It is suggested that Kupffer cells are important cellular components which produce and release PAF in order to facilitate communication between hepatic sinusoidal and parenchymal cells. Further, it is suggested that such mediator production in response to reticulo-endothelial cell stimulation causes the hepatic glycogenolytic response previously in the isolated perfused rat liver.
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