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The present experiments were carried out to investigate the mode of cAMP regulation of cumulus expansion in pig. Intracellular level of cAMP in the cumulus cells was modulated by culturing porcine cumulus oocyte complexes (COC's) with forskolin, an adenylate cyclase stimulator and 3-isobutyl-1-methylxanthine (IBMX), a phosphodiesterase inhibitor. The role of calcium in the hormone induced cumulus expansion process was also studied. Forskolin in the medium stimulated cumulus expansion from the concentration of 0.01 $\mu$M and induced full expansion at l-10 $\mu$M In contrast, IBMX in the medium (20-180 $\mu$M) failed to induce the expansion. Verapamil, a calcium ion transport blocker, suppressed follicle stimulating hormone(FSH)-induced cumulus expansion in a dose dependent fashion (0.002-0. 2 mM) when the COC's were exposed to the drugs during culture period (32 hr). But verapamil did not interfere with the triggering action of FSH during early four hours of culture period. The data presented here showed that adenylate cyclase in the porcine cumulus cells may play a key role in the regulation of the intracellular cAMP level and calcium ion may be involved in the later period of cumulus expansion process.
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