泛素E3連接酶CHIP抑制血管緊張素Ⅱ誘導(dǎo)心臟重塑的作用機(jī)制
[Abstract]:Research background and purpose:
The heat shock protein 70 carbonyl terminal reaction protein (CHIP) is a molecular chaperone protein and a ubiquitin E3 ligase containing the U- box (U-box). It can promote the degradation and removal of a variety of protein substrates by the ubiquitin proteasome system, and play an important role in myocardial cell damage, apoptosis, tumor, heat emergency and so on. But CHIP is induced by Ang II. The role and mechanism of myocardial fibrosis, apoptosis and inflammatory response are not clear. Therefore, this study mainly discusses the role and mechanism of CHIP in the remodeling of myocardium induced by Ang II.
Method:
10 weeks old wild type mice (WT) and 16 transgenic mice (CHIP-TG) with heart specific overexpression of CHIP were randomly divided into 4 groups, 8 rats in each group: (1) physiological saline (NS) +WT group; (2) NS+CHIP-TG group; (3) Ang II +WT group; (4) Ang II +CHIP-TG group. The cardiac function of animals was detected by B ultrasound, and HE and Masson staining of cardiac tissue sections were used to observe the infiltration of inflammatory cells and collagen deposition in different groups of cardiac tissues, and the number of macrophages (Mac2- positive cells), monocyte chemoattractant factor (MCP-1) and blood in different groups of hearts were detected by immunohistochemical staining. The expression level of intercellular adhesion molecule (ICAM-1), alpha smooth muscle actin (alpha -SMA), collagen type I (Collage I) and transforming growth factor beta (TGF- beta). The expression of MCP-1, ICAM-1, Collage I, TGF- beta, interleukin -1 beta (IL-1 beta) and IL-6) in different treatment groups was detected by RT-PCR. SiRNA-GFP and siRNA-CHIP adenovirus infected the primary cultured neonatal rat cardiomyocytes for 24 hours, and then treated with Ang II (100nM) for 6-24 hours. The expression level of inflammatory factors (such as MCP-1, ICAM-1, IL-1 beta and IL-6) in different treatment groups and the apoptosis of cardiac myocytes were detected by RT-PCR and TUNEL staining. Primary cultured neonatal rat cardiomyocytes were stimulated with mitogen activated protein kinase (MAPK) p38, c-Jun amino terminal kinase (JNK) inhibitor for 0.5 hours and then treated with Ang II (100nM) for 6-24 hours. RT-PCR and TUNEL staining methods were used to detect the apoptosis of IL-1 beta, IL-6 and cardiac myocytes. Finally, the immunoimprint (Western blot) method was used. The expression levels of p38 MAPK, JNK and NF-kappa B in cardiac tissue and primary cultured cardiomyocytes were detected.
Result:
1) There was no significant difference in cardiac function, pathological changes and inflammatory cell infiltration between WT and CHIP-TG groups during NS treatment.
2) after 7 days of Ang II treatment, compared with the NS+WT group, the cardiac function, the area of fibrosis, the cell apoptosis and the infiltration degree of inflammatory cells in the group Ang II +WT were significantly increased.
3) compared with the Ang II +WT group, the area of fibrosis in the Ang II +CHIP-TG group (Masson staining), the level of the expression of alpha -SMA.Collage I and TGF- beta (alpha -SMA, Collage I, TGF-p immunohistochemical staining) were significantly reduced, and the expression of macrophage infiltration (Mac-2 staining) and inflammatory factors in the cardiac tissue (MCP-1, beta and +CHIP-TG) were all clear The apoptosis of cardiomyocytes (TUNEL) was reduced.
4) the primary cultured neonatal rat cardiomyocytes were treated with Ang II. Compared with the siRNA-GFP control group, siRNA-CHIP infection could obviously increase the expression of inflammatory factors (such as MCP-1, ICAM-1, IL-1 beta and IL-6) and increase the number of apoptosis in cardiac myocytes.
5) The protective effect of CHIP on Ang II-induced myocardial remodeling is achieved by inhibiting the activity of p38MAPK.JNK and NF-kappa B signaling pathways.
Conclusion:
CHIP inhibits myocardial fibrosis, apoptosis and inflammation induced by Ang II by inhibiting the activation of p38 MAPK, JNK and NF-kappa B signaling pathways.
【學(xué)位授予單位】:北京協(xié)和醫(yī)學(xué)院
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2012
【分類號(hào)】:R363
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