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Phorbol ester, phorbol 12-myristate 13-acetate (PMA), induced a 20- to 50-fold increase (ED50: 2 microM) in cyclic adenosine 3', 5'-monophosphate (cAMP) levels in spermatozoa incubated in capacitation medium for short periods of time (30 min). Similar results were obtained with 1-oleoyl 2-acetylglycerol (OAG), whereas 1, 2 diolein, 1-oleoyl glycerol, or 4 alpha-phorbol 12, 13-didecanoate had no effect. When extracellular Ca2+ was complexed by [ethylenebis(oxyethyleneitrilo)] tetraacetic acid (EGTA), a 50% reduction of maximal stimulation was observed, and 90% inhibition was seen after chelation of both extra- and intracellular Ca2+ with EGTA and 2-[[2-[bis [(carbonyl) methyl] amino]-5-methylphenoxy] methyl]-6-methoxy-8-[bis[(carbonyl) methyl] amino] quinoline acetoxy methyl (Quin 2). The acrosome reaction was not affected by similar concentration of PMA or OAG at different periods of incubation. These results suggest the involvement of protein kinase C activity in the regulation of cAMP levels in sperm during capacitation. This stimulation is dependent on intracellular Ca2+ and probably is not linked to the process of the acrosome reaction.

Phorbol Esters Stimulate Cyclic Adenosine 3′, 5′-Monophosphate Accumulation in Hamster Spermatozoa during in Vitro Capacitation1