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Testicular phospholipids. II. Action of interstitial cell-stimulating hormone (ICSH) upon testicular phospholipids in hypophysectomized rats.

The influence of ICSH in vivo upon the incorporation of 32P (administered in vivo) into testicular phospholipids of hypophy-sectomized rats was studied 20-25 days after operation. The hormone stimulates incorporation of 32P into total testicular phospholipids and into phosphatidyl choline but probably not into sphingomyelin or into phosphatidyl ethanol-amine during the first 4 hr after administration of 32P. The incorporation of choline-3H into phosphatidyl choline was also increased. In addition, however, ICSH stimulates the incorporation of choline-3H into sphingomyelin and of ethanolamine-3H into phosphatidyl ethanolamine. These actions of ICSH were inhibited by anti-ICSH and by treatment of ICSH with urea; both anti-ICSH and treatment with urea greatly reduced the capacity of the hormone to stimulate the incorporation of acetate-14C into testosterone-14C by slices of rabbit testis in vitro. ICSH stimulates incorporation of 32P into total phospholipids of both the interstitial cells and a fraction cons...