血管平滑肌細(xì)胞與內(nèi)皮細(xì)胞相互交流的力學(xué)生物學(xué)機(jī)制
[Abstract]:Vascular smooth muscle cells (VSMCs) and endothelial cells (ECs) are adjacent in structure and closely related in function, and they interact with each other. Cross-talk plays an important role in the maintenance of vascular physiological function and vascular remodeling. However, the mechanobiology mechanism of interaction between ECs and VSMCs needs further elucidation under the action of mechanical factors.
Based on the data of differential proteomics of blood vessel induced by low shear stress (LowSS) obtained in our laboratory, this study focused on the role of interaction between ECs and VSMCs in stress-induced vascular remodeling.
Firstly, according to the predicted protein-protein interaction network by bioinformatics analysis, normal shear stress (NSS) and LowSS were applied to ECs in a parallel plate flow chamber system co-cultured with ECs and VSMCs, respectively. The secretory proteins PDGF-BB and TGF-beta 1 and their related proteins LaminA, LOX and phosphorus were studied. The results showed that LowSS induced the secretion of PDGF-BB and TGF-beta 1 in ECs and VSMCs, decreased the expression of LaminA, increased the expression of LOX and phosphorylated ERK1/2, and enhanced the proliferation and migration of ECs and VSMCs. Similar results were obtained. The expression of LDGF-BB in ECs and VSMCs was interfered by LowSS, and the expression of amina, LOX and phosphorylated ERK1/2 protein in ECs and VSMCs was inhibited, while the expression of TGF-beta 1 in ECs was not interfered by LowSS. The application of neutral antibodies blocked the expression of PDGF-BB and TGF-beta 1 in VSMCs, respectively. The results showed that PDGF-BB and TGF-beta 1 played different roles in the interaction between ECs and VSMCs induced by LowSS. ECs regulated the function of VSMCs by secreting PDGF-BB, while VSMCs regulated the function of ECs by secreting positive feedback of PDGF-BB and TGF-beta 1.
Then, according to the results of vascular differential proteomics, Rab28, a mechanical sensitive molecule with unknown function, was selected to study the effect of interaction between VSMCs and ECs on the expression of VSMCs and its mechanism under hypertensive strain. The results showed that the expression of Rab28 in the common carotid artery of hypertensive rats was increased; the expression of Rab28 in VSMCs was induced by hypertensive strain; the expression of Rab28 in ECs was also detected after strain loading and static ECs were cultured in VSMCs medium. The results showed that hypertensive strain could promote the autocrine angiotensin II (Ang II) of VSMCs. Ang II acted on both VSMCs themselves and adjacent ECs, up-regulated the expression of Rab28 in ECs and VSMCs. Interference with the expression of Rab28 in ECs inhibited the proliferation of ECs, induced apoptosis and migration of VSMCs. When ECs were starved, NF-B and Rab28 were mainly distributed in the cytoplasm; when ECs were stimulated by Ang II, NF-B and Rab28 were mainly distributed in the nucleus. The results suggest that Rab28 may be involved in the nuclear entry of NF-B, whereas the expression of Rab28 is up-regulated after NF-B activation.
In conclusion, ECs regulate the function of VSMCs through PDGF-BB under LowSS, VSMCs regulate the function of ECs through PDGF-BB and TGF-beta 1; VSMCs regulate the expression of Rab28 in ECs through Ang-II under high tensile strain, and Rab28 may participate in the activation and entry of NF-B into the nucleus, thereby regulating the function of ECs. The reconstructed Mechanobiological mechanism is of great significance and provides a new Mechanobiological thinking for the basic and clinical research of cardiovascular diseases.
【學(xué)位授予單位】:上海交通大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2013
【分類號(hào)】:R318.01;R329
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