part of part of blood vessel endothelial cell cardiac blood vessel endothelial cell Any blood vessel endothelial cell that is part of some heart. Cardiac blood vessel endothelial cells are a specialized type of endothelial cells that constitute the innermost layer, or endothelium, of blood vessels within the heart, namely the arteries, veins and capillaries. They function as a semi-permeable barrier, regulating the exchange of nutrients, ions, and small molecules between the blood and surrounding cardiac tissues. Additionally, they control the trafficking of white blood cells into the myocardium, playing a vital role in immune surveillance and response to pathogens. An important feature of cardiac blood vessel endothelial cells is their contribution to vessel tone and blood pressure regulation. Endothelial cells release nitric oxide, a potent vasodilator, which helps to modulate blood vessel diameter as per the cardiac demands and maintain homeostasis. Moreover, these cells are active participants in the blood clotting process by expressing a variety of proteins and receptors that interact with platelets and plasma clotting factors. In pathological conditions, the function of cardiac blood vessel endothelial cells can change dramatically, leading to various cardiovascular diseases. In response to injury or disease, these cells can proliferate and migrate contributing to vessel repair or aberrant remodelling, promote inflammation, and contribute to the formation of atherosclerotic plaques. Their ability to switch from a quiescent, anticoagulant phenotype to a more active, procoagulant state is a principal factor in thrombosis. (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_0010006 cardiac endothelial cell heart