Phosphodiesterase enzyme (PDE)

Phosphodiesterases (PDEs) are a superfamily of enzymes that catalyze the hydrolysis of phosphodiester bonds, specifically degrading the second messenger molecules cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP). By regulating these messengers, PDEs play a central role in controlling intracellular signaling pathways that govern diverse physiological processes such as vision, memory, immune response, cardiovascular function, and hormone signaling. There are 11 recognized mammalian PDE families (PDE1–PDE11), each encoded by distinct genes. Selective inhibition of specific PDE isoforms has led to major therapeutic advances, including PDE5 inhibitors for erectile dysfunction and PDE4 inhibitors investigated for anti-inflammatory effects in respiratory diseases. Genetic mutations in certain phosphodiesterase genes have been linked to disease predisposition.

Inhibition of phosphodiesterase enzymes, leading to increased levels of cAMP and/or cGMP.