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Addition of prostaglandin F2 alpha and prostaglandin E2 to isolated perfused rat liver led to a dose-dependent, transient net Ca2+ release, which was completed within 3 min. Withdrawal of the prostaglandins resulted in a Ca2+ re-uptake over a period of about 10 min. Simultaneously, these prostaglandins induced an increase of portal pressure, stimulated hepatic glucose output and 14CO2 production from [1-14C]glutamate and led to K+ movements across the hepatocyte plasma membrane similar to those observed with other Ca2+-mobilizing agents. With prostaglandin F2 alpha there was a close correlation between the net Ca2+ release and the maximal rate of initial net K+ uptake by the liver (linear regression coefficient r = 0.902; n = 20). Prostaglandin F2 alpha was more effective than prostaglandin E2 or D2. Because prostaglandins are known to be produced by hepatic non-parenchymal cells during stimulation by phagocytosis or by addition of extracellular ATP or UTP, these data suggest an interaction between non-parenchymal and parenchymal liver cells and point to a modulating role of prostaglandins in hepatic metabolism and microcirculation, which is mediated by Ca2+-mobilizing mechanisms.

Prostaglandin Responses in Isolated Perfused Rat Liver: Ca 2⊕ and K ⊕ Fluxes, Hemodynamic and Metabolic Effects