Nitric oxide release pathway

The **nitric oxide release pathway** encompasses the cellular processes whereby NO is synthesized (mainly via nitric oxide synthase enzymes: endothelial NOS, neuronal NOS, inducible NOS), released, and then acts as a signaling molecule to modulate various physiological functions such as vasodilation, neurotransmission, immune defense, inhibition of platelet aggregation, and smooth muscle relaxation[2][3][4][5][7]. NO exerts these effects primarily by activating soluble guanylyl cyclase in target cells, increasing cyclic GMP, and leading to cellular responses such as vascular smooth muscle relaxation[5]. The pathway plays essential roles in cardiovascular, nervous, and immune systems, and dysregulation can contribute to cardiovascular disease, neurodegeneration, cancer, and other pathologies[2][3][4][6][7]. Because "nitric oxide release pathway" describes a pathway and not a single molecule or established drug target (such as a receptor, ion channel, or enzyme as conventionally defined), this entry is marked as **is_incorrect: true** in terms of canonical drug target nomenclature. The most relevant canonical targets in this pathway would be the specific nitric oxide synthase isoforms (especially endothelial nitric oxide synthase, NOS3/eNOS), or the downstream effector soluble guanylyl cyclase.

Other names

Nitric oxide signaling pathwayNitric oxide signalingNitric oxide biosynthesis pathwayNO pathway

Donation or stimulation of NO release (NO donors, like nitroglycerin), leading to vasodilation[4][7]. Inhibition of degradation of cGMP (PDE5 inhibitors), enhancing NO signaling. Modulation of NO synthase enzymes.