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Several Ca2+-mobilizing agents were tested for their potential to elicit the net release of prostaglandins from the isolated perfused rat liver. Among these ATP and UTP only led to an efficient stimulation of PGD2 and PGE2 synthesis. 20 microM ATP or 20 microM UTP increased the release of PGD2 8-fold and that of PGE2 2 to 3-fold. In total, at least 40 times more PGD2 than PGE2 left the liver after stimulation. The time course of prostaglandin release was similar for both nucleotides. Vasopressin had almost no effect on the release of both prostaglandins and on portal vein pressure. But phenylephrine and nerve stimulation while raising the PGD2 efflux only slightly caused an elevation of PGE2 outflow and portal pressure.

biological chemistry hoppe-seyler

Stimulation of Prostaglandin Release by Ca 2⊕ -Mobilizing Agents from the Perfused Rat Liver. A Comparative Study on the Action of ATP, UTP, Phenylephrine, Vasopressin and Nerve Stimulation