| 背景信息 |
Nitric oxide synthase 3 (NOS3), also known as endothelial nitric oxide synthase (eNOS), is an enzyme that catalyzes the production of nitric oxide (NO) from L-arginine in endothelial cells. This protein plays a crucial role in regulating vascular tone, promoting vasodilation, and maintaining blood flow through a cyclic guanosine monophosphate (cGMP)-mediated signaling pathway. NOS3 is a dimeric enzyme composed of two identical subunits, each containing a reductase domain and an oxidase domain, which require calcium and calmodulin for activation. Dysregulation of NOS3 is associated with several cardiovascular diseases, including hypertension, atherosclerosis, and coronary artery disease, where impaired NO production can lead to endothelial dysfunction and increased vascular resistance. Genetic variations in the NOS3 gene have also been linked to susceptibility to conditions such as stroke and ischemic heart disease. |