part of vascular associated smooth muscle cell aortic smooth muscle cell 2011-02-28T01:42:12Z BTO:0004577 Aortic smooth muscle cells are specialized and highly differentiated muscle cells that are located in the tunica media layer of the aorta. They consist of spindle-shaped cells with a centrally located nucleus. These cells are rich in actin and myosin, muscle contractile proteins, that allow them to exert force and change shape. Aortic smooth muscle cells play a vital role in maintaining blood pressure and circulation, and are essential for vascular integrity and function. The primary function of these cells is contraction and relaxation, which enables the regulation of blood flow and pressure in the aorta, and helps in the distribution of oxygen and nutrients throughout the body. Additionally, a critical characteristic of smooth muscle cells is their plasticity. They can undergo phenotypic modulation in response to changes in their environment or vascular injury, switching from a contractile to a synthetic phenotype. The contractile phenotype is characterized by high contractility and low proliferation rate, while the synthetic phenotype is marked by increased cell proliferation and matrix synthesis but reduced contractile function. Aortic smooth muscle cells have a significant role in the physiological and pathological processes of the cardiovascular system. In the normal physiological state, they contribute to the elasticity and flexibility of the aorta. Conversely, in pathological states, changes in the function and structure of aortic smooth muscle cells are connected with various vascular diseases, including atherosclerosis, hypertension, and aneurysm. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) https://cellxgene.cziscience.com/cellguide/CL_0002539 A smooth muscle cell of the aorta. blood vessel smooth muscle cell aorta smooth muscle tissue