富含半胱氨酸的酸性分泌糖蛋白在體外調(diào)節(jié)人平滑肌細(xì)胞動(dòng)脈穩(wěn)態(tài)的實(shí)驗(yàn)研究
[Abstract]:Objective: The intracranial aneurysm is a life-threatening disease. It is the primary cause of the spontaneous subarachnoid hemorrhage, and once the aneurysm ruptures, there is a very high rate of disability and mortality. The exact pathogenesis of the intracranial aneurysm is still not very clear, and the lack of screening for the occurrence of intracranial aneurysms and the assessment of specific biological markers for the risk of their rupture. According to the literature review, the research group put forward the concept of the "arterial steady state" Homeostat, that is, to the damage caused by the blood flow stress and the degeneration of the blood vessel, the arterial blood tube has the ability to repair itself, so that the dynamic balance of the injury and the repair is formed to maintain the blood vessel stability, The break in this balance may be the pathogenesis of an intracranial aneurysm. Genetic factors play an increasingly important role in the pathogenesis of intracranial aneurysms. It is shown that the acidic secreted glycoprotein (SPARC), which is rich in cysteine, is widely expressed in the smooth muscle cell layer of the intracranial aneurysm, and its effect on smooth muscle cells is not clear. The purpose of this paper is to study the effect of SPARC on the human vascular smooth muscle cells, and whether the effect of this effect on the steady state of the artery, thus to explore the possible role of SPARC in the occurrence and development of the intracranial aneurysm. Methods: The primary human umbilical artery smooth muscle cells (HUASMCs) were used as the research object, and the cells were exposed to a medium containing (0, 0.125, 0.25, 0.5,1,2 and 4 ug/ ml) for 24 hours, and the cell viability of HUASMCs was detected by a cell count kit (CCK8). The cell cycle distribution and cell apoptosis rate of HUASMCs were detected by flow cytometry after 2,6,12,24 and 48 hours of medium containing (0,2 ug/ ml) of SPARC, respectively. The expression of the following proteins in HUASMCs was detected by Western Blot technique: cell cycle control protein (P21, P53, CyclinD1), Apoptosis-related proteins (Bax, Bcl2, Caspase-3, Ceaved Caspase-3), gelatinase and metalloprotease inhibitor (MMP2, MMP9, TIMP2, TIMP1). Results: HUASMCs were exposed to a medium containing (2,4 ug/ ml) of SPARC, and after 24 hours, the cell viability was 89.30% and 87.57% 2.17%, respectively (P0.05 vs. control group). After 12 hours of exposure to a medium containing 2 ug/ ml of SPARC, the proportion of cells in the G0/ G1 phase of the cell cycle was 74.77 and 1.33% (P0.05 vs. The proportion of cells in early and late-stage apoptosis was 7.38-1.25% and 4.86-0.81%, respectively (P0.01 vs. control group). When HUASMCs were exposed to a medium containing 2 ug/ ml of SPARC for 24 hours, the results showed that the content of P21 protein increased significantly in 2-12 hours (P0.05 vs. control group), while the expression of P53 protein did not change significantly within 48 hours (P0.05 vs. control group); at the same time, The level of Bax protein was up-regulated and peaked at 24 h (P0.01 vs. control group), while the Bcl2 protein did not change significantly within 24 hours, but decreased significantly in 48 hours (P0.01 vs. control group), and Cleared casei 3 protein was also up-regulated and reached its peak at 24 h (P0.05 vs. control group); The content of MMP2 protein was significantly increased and reached the peak at 24 h (P0.01 vs. control group), and the expression level of TIMP2 protein was relatively stable; the expression of MMP9 protein was significantly increased, with a significant increase in the content of TIMP1 protein (P0.05 vs. Control group). The results suggest that SPARC can block the proliferation of HUASMCs by increasing the expression of P21 protein in the G0/ G1 phase of the cell cycle, inhibit the proliferation of the HUASMCs, and promote the apoptosis of the cells of the HUASMCs in the mitochondria pathway, thereby reducing the cell viability of the HUASMCs. SPARC may also promote the gelatinase (MMP2, The secretion of MMP9 leads to the degeneration of the extracellular matrix and the inner elastic layer in the vascular wall. Conclusion: The results suggest that SPARC may increase the damage to the media, inner elastic layer and other extracellular matrix of the intracranial artery, reduce its self-healing ability, break the dynamic balance of the arterial injury and repair, and result in the occurrence and development of the intracranial aneurysm. And even break.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:R743
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