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The cAMP antagonist, prostaglandylinositol cyclic phosphate (cyclic PIP), is synthesized from prostaglandin E and activated inositol phosphate. From various tissues only that amount of cyclic PIP can be isolated that constitutes the difference between synthesis and degradation. In order to overcome this drawback, the cyclic PIP degrading enzyme or enzymes had to be characterized prior to searching for inhibitors. Cyclic PIP degrading activities have been found in all rat tissues tested, and are lowest in brain (380 pmol × min −1  × g −1  wet weight) and highest in liver (1460 pmol × min −1  × g −1  wet weight). They are associated primarily with particulate structures of the cells, but not with the plasma membrane. There appear to be at least two different enzymatic activities involved the degradation of cyclic PIP, because there are two pH-optima, one between pH 7 and 8 and another between pH 4 and 5. It is assumed that these activities are located in microsomes and lysosomes. Because prostaglandylinositol is the final product obtained the degradation of cyclic PIP, a phosphodiesterase and a phosphatase should be involved, which could not yet be identified individually. Like alkaline phosphatase, cyclic PIP-degrading enzymes require Mg 2+  and they are inhibited by heavy metal ions such as mercuric and copper chloride, by sodium fluoride and interestingly, by prostaglandins.

Degradation of the Cyclic AMP Antagonist Prostaglandylinositol Cyclic Phosphate (Cyclic PIP) by Dephosphorylation