CTRP 3經(jīng)PKA通路對(duì)大鼠腦出血后氧化應(yīng)激損傷的作用及機(jī)制研究
[Abstract]:Background: intracerebral hemorrhage (ICH) is characterized by rapid progression, high incidence, mortality and disability. Many studies have shown that oxidative stress plays an important role in cerebral hemorrhage injury. CTRP3 is a newly discovered adipose factor, and CTRP3 plays an important role in inflammation, metabolism, apoptosis, angiogenesis, cardiac protection and so on. In the model of myocardial ischemia in mice, CTRP-3 can improve cardiac function by reducing cardiomyocyte apoptosis and promoting cardiac angiogenesis. Nadh-3 enzyme plays a dominant role in oxidative stress, and NADPH subunit NOX-2 plays an important role in oxidative stress. However, the protective effect of CTRP-3 on oxidative stress injury after intracerebral hemorrhage has not been reported up to now. Objective: (1) to investigate whether CTRP-3 plays a protective role in intracerebral hemorrhage (ICH) by establishing a model of intracerebral hemorrhage (ICH) in vivo, and (2) to investigate whether CRTP3 participates in the regulation of oxidative stress response through PKA/NOX-2 pathway, and to clarify its mechanism. Methods: (1) to explore the time point selection of oxidative stress injury. The experimental animals were randomly divided into sham operation group (sham), 6 h, 12 h, 24 h, 48 h, 72 h cerebral hemorrhage model group. The expression of oxidative stress related enzyme NOX 2 was observed. The most expressed time point of NOX-2 was selected for follow-up study. (2) the protective effect of CTRP-3 on brain. The experimental animals were randomly divided into three groups: sham operation group, (sham), cerebral hemorrhage group, ICH reagent control group and bleeding drug group (recombinant or lentiviral overexpression of CTRP-3). The method of administration was intracerebroventricular injection. To observe the neuroprotective effect of CTRP-3 and explore the possible mechanism: neurologic score, brain water content, blood-brain barrier permeability, Western Blot were used to measure the expression of CTRP-3, PKA, NOX-2 protein in brain tissue of rats with intracerebral hemorrhage (ICH) in each group. The levels of CTRP-3 and NOX-2 in brain tissue were measured by QPCR, and the oxidative stress damage was evaluated by SOD,MDA,GSH kit. Immunohistochemistry was used to detect the expression of NOX-2 in brain tissue sections. (3) the mechanism of CTRP-3 involved in the regulation of oxidative stress response through PKA/NOX-2 pathway was studied. Intracerebral hemorrhage models were treated with PKA agonists and inhibitors respectively. Neurological score, brain water content, blood-brain barrier permeability, Western Blot and SOD, were used to measure brain water content, blood-brain barrier permeability, PKA,NOX-2 protein expression and SOD, after ICH model was established in each group. MDA kit was used to evaluate oxidative stress damage. Results: (1) the expression level of NOX-2 increased after ICH, and the expression of NOX-2 was the highest 24 h after ICH. (2) Recombinant or lentiviral overexpression of CTRP-3 significantly alleviated the symptoms of behavioral loss after ICH. Brain edema and permeability of blood-brain barrier increased the expression of CTRP-3 and PKA protein, decreased the expression of NOX-2 protein and m-RNA, and down-regulated the expression of SOD and GSH by MDA,. (3) treatment with PKA agonist could up-regulate the expression of PKA protein, decrease the protein level of NOX-2, decrease brain edema and permeability of blood-brain barrier, and decrease oxidative stress injury; After treatment with PKA inhibitor, the protein expression of NOX-2 was up-regulated, which aggravated the brain damage. Conclusion: (1) CTRP3 plays a protective role in oxidative stress injury after intracerebral hemorrhage, and (2) CRTP-3 can decrease the expression of NOX-2 and the oxidative stress-induced injury response, which can be achieved by up-regulating the expression of PKA.
【學(xué)位授予單位】:重慶醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:R743.34
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