the action of 17alpha , 20beta-oh-p , on germinal vesicle breakdown ( gvbd ) in oocytes incubatedin vitro within the follicle , was inhibited by various substances expected to elevate the intraoocyte concentrations of camp : camp ( > = 1 mm ) or dibutyril camp ( > = 2 mm ) , phosphodiesterase inhibitors such as theophylline ( > = 0.2 mm ) or 3-isobutyl-1 methylxanthine ( ibmx > = 0.1 mm ) , adenylate cyclase activators such as cholera toxin ( > 100 nm ) or forskolin ( > = 0.03 mm ) .
C0039771
theophylline
C0000096
ibmx