1)天津大学机械工程学院,天津 300350;2)重庆大学生物工程学院,重庆 400044
Tel:
国家自然科学基金(11972252) 和天津市自然科学基金 (17JCYBJC29300) 资助项目。
1)School of Mechanical Engineering, Tianjin University, Tianjin 300350, China;2)School of Bioengineering, Chongqing University, Chongqing 400044, China
This work was supported by grants from The National Natural Science Foundation of China(11972252)and Tianjin Natural Science Foundation (17JCYBJC29300).
内皮细胞(endothelial cell,EC)作为不可兴奋细胞,早前通常被认为缺乏功能性电压门控钙离子通道(voltage-gated calcium channel,VGCC),如人脐静脉内皮细胞、牛肺动脉内皮细胞、牛主动脉内皮细胞等。随着膜片钳技术、荧光显微技术、聚合酶链式反应(PCR)技术的发展,越来越多的VGCC在各种内皮细胞中被发现,如人主动脉内皮细胞、大鼠主动脉内皮细胞、大鼠肺微血管内皮细胞等。目前对于VGCC存在与否主要有3种检测方法:利用膜片钳技术对离子通道电流的检测、利用荧光显微技术对胞内钙离子浓度变化的检测、利用PCR技术对离子通道基因或蛋白质表达的检测。内皮细胞不单单是血液和其他相邻组织细胞及基质蛋白间的物理屏障,更重要的是通过细胞膜上VGCC的开放和关闭对细胞和血管组织的生理变化产生显著的影响。一方面,VGCC对胞内钙离子浓度变化的影响,控制着一氧化氮(NO)等血管舒张因子的释放,调节血管张力的平衡。另一方面,作为钙离子内流重要途经的VGCC,经过Ras和MEK通路的诱导、磷酸化PI3K和Akt通路,影响内皮细胞迁移和增殖。此外,部分生理现象,如血管内压力产生的机械应变和血流相关的剪切应力通过激活机械小体,导致
Endothelial cells, as non-excitable cells, were previously thought to lack functional voltage-gated calcium channels (VGCC), such as human umbilical vein endothelial cells, bovine pulmonary artery endothelial cells, bovine aortic endothelial cells, and bovine aorta endothelial cells. With the development of patch clamp technology, fluorescence microscopy technology, and polymerase chain reaction (PCR) technology, more and more VGCC are found in various endothelial cells, such as human aortic endothelial cells, rat aortic endothelial cells, and rat pulmonary microvascular endothelial cells. At present, there are 3 main detection methods for the existence of VGCC: the detection of ion channel current by patch clamp technology, the detection of intracellular calcium ion concentration change by fluorescence microscopy technology, and the detection of ion channel gene or protein expression by PCR. Endothelial cells are not only the physical barrier between blood and other adjacent tissue cells and matrix proteins, but more importantly, exert a significant influence on the physiological changes of cell and vascular tissues through the opening and closing of VGCC on the cell membrane. On the one hand, the effect of VGCC on the change of intracellular calcium ion concentration controls the release of vasodilators such as nitric oxide (NO) and regulates the balance of vascular tone. On the other hand, VGCC, which is an important route for calcium ion inflow, affects endothelial cell migration and proliferation through the induction of a kind of small G protein (Ras) and mitogen-activated proteinkinase kinase (MEK) pathways, the phosphonic acidification of phosphatidylinositol 3 kinase (PI3K) and serine/threonine protein kinase (Akt) pathways. In addition, some physiological phenomena, such as mechanical strain generated by intravascular pressure and shear stress associated with blood flow, activate VGCC by activating mechanical bodies, causing the ATP-sensitive potassium channel (
李双君,潘君,崔玉红.内皮细胞电压门控钙离子通道及其功能研究进展[J].生物化学与生物物理进展,2022,49(6):1061-1074
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