activators of protein kinase c such as 1-oleoyl-2-acetylglycerol , mezerein , and the phorbol esters phorbol 12-myristate 13-acetate ( pma ) and phorbol 12,13-didecanoate induced a time-dependent increase in proenkephalin mrna levels , whereas the inactive phorbol ester 4 alpha-phorbol 12,13-didecanoate had no effect .
C0039654
phorbol
C0031586
phorbol ester