摘要目的 探讨人动脉粥样硬化斑块局部整合素α5β1与纤连蛋白的表达情况,分析二者与动脉粥样硬化发生发展的关系.方法 收集尸检标本120例,分别取主动脉及冠状动脉.采用免疫组织化学EnVision两步法染色检测CD68、肌动蛋白、整合素α5β1与纤连蛋白在冠状动脉组织中的表达情况.依据弹力纤维染色及美国国立卫生研究院设计的Scion Image(60.1)软件的检测结果确定冠状动脉狭窄程度,并分为A组(0~25%)、B组(26%~50%)、C组(51%~75%)、D组(76%~100%)4组.结果 (1)整合素α5β1可表达于内皮细胞胞质、泡沫细胞胞质、单核巨噬细胞胞质、平滑肌细胞胞质以及钙化灶周边.整合素α5β1在已经穿越内弹力板处的平滑肌细胞的表达高于中膜平滑肌细胞.整合素α5β1在不同狭窄程度冠状动脉平滑肌的表达呈现随着狭窄程度的升高而降低的趋势.(2)纤连蛋白表达于泡沫细胞胞质、单核巨噬细胞胞质、平滑肌细胞胞质(尤其穿过内弹力板处的平滑肌细胞胞质呈现较高表达)及钙化灶周边.(3)整合素α5β1与纤连蛋白表达的相关性:二者在动脉粥样硬化组平滑肌细胞及钙化灶周边的表达均呈明显正相关性(P<0.01).结论 动脉粥样硬化发生发展过程中整合素α5β1与纤连蛋白参与调控平滑肌细胞向内膜的迁移,促进动脉粥样硬化斑块局部钙化的发生、发展.动脉粥样硬化后期,整合素 α5β1不参与加重冠状动脉狭窄程度.

abstractsObjective To investigate the expression of integrin α5β1 and fibronectin in the human aorta and coronary artery, and their effects in the development of atherosclerosis. Methods One hundred and twenty autopsy aorta and coronary artery specimens were collected, and the expression of CD68, actin, integrin α5β1 and fibronectin was detected by immunohistochemical staining. Atherosclerotic plaques were located by CD68 and actin staining, and the degree of coronary artery stenosis was determined by elastic fiber staining and NIH Scion Image ( 60. 1 ) software. The coronary artery tissues were divided into groups A ( 0-25%);B ( 26%-50%);C ( 51%-75%) and D ( 76%-100%) according to the degree of stenosis. Results Integrin α5β1 showed cytoplasmic expression in endothelium, foam cells, monocytes, smooth muscle cells and adjacent tissue around calcification. In both the aorta and coronary artery, integrin α5β1 expression was stronger in the smooth muscle cells in the internal elastic lamina than in the tunica. The expression intensity in coronary artery smooth muscle decreased with increasing degree of coronary artery stenosis. Fibronectin showed cytoplasmic expression in foam cells, monocytes, smooth muscle cells of the internal elastic lamina and adjacent tissue around calcification. There was positive correlation of fibronectin and integrin α5β1 expression in smooth muscle cells and adjacent tissue around calcification. Conclusions In the development of atherosclerosis, integrin α5β1 and fibronectin may participate in the regulating the migration of smooth muscle cells to the intima, and promote the formation of local calcification of atherosclerotic plaques. But integrin α5β1 is not involved in the late stage of atherosclerosis with increasing coronary artery stenosis.