主動脈旁脂肪組織釋放IL-6增加LDL受體缺陷小鼠動脈僵硬度的研究
[Abstract]:Chronic cardiovascular disease is a common chronic disease with the highest morbidity and mortality in the disease spectrum. It is reported that 23.3 million people will die of cardiovascular diseases worldwide by 2030. Cardiovascular diseases lead to huge medical and health expenditures, especially in low-income developing countries. From 2005 to 2015, China has invested about 558 billion US dollars in the prevention and treatment of cardiovascular diseases. Therefore, it is of great social significance to find a way to prevent the occurrence and development of cardiovascular diseases. Hyperlipidemia is often associated with increased arterial stiffness, which increases the incidence of cardiovascular events. Early intervention of arterial stiffness in patients with hyperlipidemia is of great significance in delaying and controlling the progression of cardiovascular disease. Studies have shown that hyperlipidemia can increase arterial stiffness, but whether hyperlipidemia passes through. In addition, previous studies have found that para-aortic adipose tissue (PAT) releases a variety of inflammatory mediators and cytokines, including interleukin-6 (IL-6), and IL-6 is an important cause of increased arterial stiffness. During the disease, PAT increased arterial stiffness by releasing IL-6.
LDL receptor deficient mice (LDLr-/-mice) are typical hyperlipidemia model mice. The purpose of this study was to investigate the effect of hyperlipidemia on arterial stiffness and its mechanism. Firstly, in order to clarify that hyperlipidemia increases arterial stiffness by affecting the expression of extracellular matrix protein in arterial wall, this study selected LDLr-/-mice as the main research object. LDLr - / - mice were selected as the research object, and wild type (WT) mice were used as the control group. The general indexes (body weight, heart weight, adipose tissue weight, lean tissue weight and systolic blood pressure level), blood lipid, arterial pulse wave velocity (aPWV), aortic elastic modulus and arterial stiffness related protein (collagen, glycosylation) were observed and compared between the two groups. Secondly, in order to clarify the effect of LDLr - / - on aortic stiffness, we isolated the aortas of LDLr - / - mice and WT mice (with or without PAT) and divided them into the following four groups: WT group; WT + PAT group; LDLr - / - group; LDLr - / - group; LDLr - / -+ PAT group. Compared with the four groups of mice, the aortic elastic modulus, aortic collagen, elastin and the expression level of glycation end products were measured. The changes of aortic elastic modulus were detected and compared between the two groups. Then, the PATs of LDLr - / - mice and WT mice were separated and cultured in vitro. The PATs were divided into the following two groups: WT group and LDLr - / - group. The arterial segments were divided into the following two groups: control group, IL-6 group, PAT + control group, PAT + IL-6Ab group, and PAT + IL-6Ab group. The change of elastic modulus of aortic segments.
The results showed that: (1) There were no significant differences in body weight, heart weight, adipose tissue weight, lean tissue weight and systolic blood pressure between LDLr - / - mice and WT mice (P 0.05); (2) Total cholesterol and triglyceride levels in LDLr - / - mice were significantly higher than those in WT mice (P 0.05); (3) aortic stiffness of LDLr - / - mice (aPWV, aPWV, triglyceride level). Compared with WT group, the aortic stiffness of LDLr-/- group was significantly increased, and the aortic stiffness of LDLr-/-+PAT group was further increased, the difference was statistically significant (P 0.05). (5) Compared with WT mice, PAT conditioned medium from LDLr - / - mice significantly increased aortic stiffness of WT mice, the difference was statistically significant (P 0.05); (6) In LDLr - / - mice aortic wall media with PAT culture, the expression of collagen I in adventitia increased, the expression of AGEs in adventitia increased, and the expression of elastin decreased, the difference was statistically significant (P 0.05). Significance (P 0.05); (7) The size of PAT cells in LDLr - / - mice was significantly larger than that in WT mice, and the difference was statistically significant (P 0.05); (8) The effect of conditioned medium of LDLr - / - mice PAT on aortic stiffness was higher than that in subcutaneous adipose tissue, paraepididymal adipose tissue conditioned medium; (9) LDLr - / - mice PAT secreted more IL-6 than WT mice PAT, and Moreover, IL-6 increased aortic stiffness. IL-6 antibody could reduce the increase of arterial stiffness caused by PAT.
The results showed that: (1) the expression of extracellular matrix protein in arterial wall of LDLr - / - mice was unbalanced, and the degree of aortic stiffness was significantly higher than that of WT mice; (2) LDLr - / - mice PAT promoted the increase of aortic stiffness; (3) LDLr - / - mice PAT had stronger effect on aortic stiffness than subcutaneous adipose tissue, paraepididymal fat. The PAT of PAT. (4) LDLr-/- mice in fat tissue and WT mice increased the arterial stiffness through releasing IL-6.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:R543
【共引文獻】
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