Figure 8From: Effects of sex hormones on bronchial reactivity during the menstrual cycle Testosterone does not affect PDE activity. PDE activity (cyclic nucleotide-degrading PDE activity) was evaluated in the presence of the indicated concentration of testosterone or IBMX, using a commercially available cyclic nucleotide phosphodiesterase kit. IBMX is a non selective PDEs inhibitor, used as positive control. P > 0.05.Back to article page