This requires knowledge of MOA for phosphodiesterase inhibitors (which are also used for erectile dysfunction). All phosphodiesterase inhibitors will inhibit phosphodiesterase, which normally catalyzes hydrolysis of cAMP or cGMP, so they will work by increasing cAMP/cGMP levels! [FA2020 p246]
NOTE: do not get confused by the addition of NO as an answer, though arteriole dilation by phosphodiesterase inhibitors works in part by enhancing NO activity on smooth muscle, it does not increase the concentration of NO. NO triggers increased cGMP to dilate smooth muscles, and phosphodiesterase inhibitors prevent breakdown of this cGMP, so they work in synergy!
submitted by โcassdawg(1781)
This requires knowledge of MOA for phosphodiesterase inhibitors (which are also used for erectile dysfunction). All phosphodiesterase inhibitors will inhibit phosphodiesterase, which normally catalyzes hydrolysis of cAMP or cGMP, so they will work by increasing cAMP/cGMP levels! [FA2020 p246]
NOTE: do not get confused by the addition of NO as an answer, though arteriole dilation by phosphodiesterase inhibitors works in part by enhancing NO activity on smooth muscle, it does not increase the concentration of NO. NO triggers increased cGMP to dilate smooth muscles, and phosphodiesterase inhibitors prevent breakdown of this cGMP, so they work in synergy!