Endothelial NOS (eNOS), also known as nitric oxide synthase 3 (NOS3) or constitutive NOS (cNOS), is an enzyme that in humans is encoded by the NOS3gene located in the 7q35-7q36 region of chromosome 7.[5] This enzyme is one of three isoforms that synthesize nitric oxide (NO), a small gaseous and lipophilic molecule that participates in several biological processes.[6][7] The other isoforms include neuronal nitric oxide synthase (nNOS), which is constitutively expressed in specific neurons of the brain[8] and inducible nitric oxide synthase (iNOS), whose expression is typically induced in inflammatory diseases.[9]
eNOS is primarily responsible for the generation of NO in the vascular endothelium,[10] a monolayer of flat cells lining the interior surface of blood vessels, at the interface between circulating blood in the lumen and the remainder of the vessel wall.[11] NO produced by eNOS in the vascular endothelium plays crucial roles in regulating vascular tone, cellular proliferation, leukocyte adhesion, and platelet aggregation.[12] Therefore, a functional eNOS is essential for a healthy cardiovascular system.
^Oliveira-Paula GH, Lacchini R, Tanus-Santos JE (Feb 2014). "Inducible nitric oxide synthase as a possible target in hypertension". Current Drug Targets. 15 (2): 164–74. doi:10.2174/13894501113146660227. PMID24102471.
^Sumpio BE, Riley JT, Dardik A (Dec 2002). "Cells in focus: endothelial cell". The International Journal of Biochemistry & Cell Biology. 34 (12): 1508–12. doi:10.1016/s1357-2725(02)00075-4. PMID12379270.