Figure 2.
A simplified schematic of the sites of action of selected therapies. Arrows indicate activation and (T) indicate inhibition. PGI2 = prostaglandin I2, ET-1 = endothelin-1, ETA = endothelin A receptor, ETB = endothelin B receptor, NO = nitric oxide, sGC = soluble guanylate cyclase, GTP = guanosine-5′-triphosphate, cGMP = guanosine-3′-5′cyclic monophosphate, GMP = guanosine monophosphate, AC = adenylate cyclase, cAMP = adenosine-3′-5′-monophosphate, AMP = adenosine monophosphate, PDE5 = phosphodiesterase type 5.