W-P小体
内皮细胞胞质中可见一种外包单位膜的杆状 小体,称Weibel-Palade小体(W-P小体)。W-P小 体是内皮细胞特有的结构。可能是合成和贮存与 凝血相关的第Ⅷ因子相关抗原(factor Ⅷrelated antigen, FⅧ)。
Medical Application
The endothelium also has an antithrombogenic抗凝血 酶原激酶 action, preventing blood coagulation凝固 . When endothelial cells are damaged by atherosclerotic lesions粥样 硬化病变, the uncovered subendothelial connective tissue in duces the aggregation of blood platelets. This aggregation in itiates a cascade of events form solid masses called emboli 栓子 may detach and be carried by the blood to obstruct dis tant blood vessels. Thus, the integrity of the endothelial laye r preventing the contact between platelets and the su-bendot helial connective tissue, is an important antithrombogenic m echanism .although morphologically similar, the endothelial cells of different blood vessels have different functional pro perties.