Abstract
The synthesis of insect juvenile hormone III (JH III) by isolated corpora allata of the cockroach Diploptera punctata incubated in vitro is inhibited by phorbol 12-myristate 13-acetate (PMA), phorbol 12,13-dibutyrate and 1-oleyl-2-acetylglycerol. 4α-Phorbol 12,13-didecanoate and diolein are inactive. The inhibitory effect of phorbol 12-myristate 13-acetate is fully reversed by 2 E,6 E-farnesol or by 2 E,6 E-farnesoic acid. It is highest in corpora allata that are past their peak in secretory activity or that have been inhibited by injections of 20-hydroxyecdysone. This effect of phorbol esters implicates protein kinase C in the regulation of insect corpus allatum activity.
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