MI/RI is important reason in aggravating damage after myocardial ischemia. CTRP3 played a major role in the protecting of MI/RI. Lysosomal-associated membrane protein 1( LAMP1) is receptors which mediate the hepatic actions of CTRP3. Our previous studies showed LAMP1 and Jun N-terminal kinase(JNK) played a important role in protecting of MI/RI. Thus, we speculate that CTRP3 may decrease MI/RI through LAMP1-JNK Interacting Protein 2(JIP2)-JNK signal pathway.We planed to construct anoxia/reoxygenation injury mice myocardial cell model and MI/RI model in mice and use LRC-TriCEPS / Western blot/adenovirus vector transfection/ RNA interfering technology to reveal the role of CTRP3 in MI/RI and elucidate the regulatory mechanism of CTRP3 in decreasing the oxidation/nitrification stress.Therefore, the present study may reveal mechanism of protecting of MI/RI and provide a new idea to prevention and cure CHD from a new perspective of CTRP3.
MI/RI是心肌缺血后心肌损伤加重的重要原因。脂肪因子CTRP3是新发现的保护MI/RI的重要分子,其在肝癌细胞系的受体是溶酶体相关膜蛋白1。迄今CTRP3心肌受体及其下游分子仍知之甚少。我们的预实验结果提示:溶酶体相关膜蛋白1和JNK在CTRP3保护MI/RI起重要作用。为此,我们提出假说:CTRP3通过受体溶酶体相关膜蛋白1、JNK相互作用蛋白2及JNK保护MI/RI。为了验证这一假说,我们通过小鼠心肌细胞、大鼠心肌细胞缺氧/复氧和小鼠MI/RI模型,采用LRC-TriCEPS技术,Western blot、腺病毒载体转染、RNA干扰等手段,从分子、细胞、组织以及动物整体水平等多方面探讨CTRP3在MI/RI的重要作用,明确CTRP3通过减轻氧化/硝化应激保护MI/RI的调控机制。本研究将从CTRP3这个新视点为揭示MI/RI的保护机制奠定基础,为冠心病及其并发症的防治提供新的思路。
心肌缺血/再灌注损伤没有有效的防治办法。研究发现:CTRP3与心功能不全关系密切。本项目研究发现:1.H9C2细胞缺氧/复氧损伤后CTRP3的表达降低;2.CTRP3保护缺氧/复氧损伤的H9C2细胞;3.心肌细胞LAMP1是CTRP3的受体。4.上调 LAMP1减轻H9C2细胞的缺氧/复氧损伤。5.抑制CTRP3过表达LAMP1保护作用减弱;6.CTRP3介导LAMP1/JIP2/JNK信号通路保护缺氧/复氧损伤的H9C2细胞;7.心肌缺血/再灌注损伤后CTRP3表达水平下降;8.CTRP3保护心肌缺血/再灌注损伤后心功能;9.CTRP3降低心肌缺血/再灌注损伤的心肌酶,减少心肌梗死面积及硝基酪氨酸;10.CTRP3降低心肌缺血/再灌注损伤后心肌细胞的凋亡;11.CTRP3介导LAMP1/NUMB保护心肌缺血/再灌注损伤;12.CTRP3介导JIP2/JNK保护心肌缺血/再灌注损伤;13.CTRP3介导 LAMP1/JIP2/JNK保护心肌缺血/再灌注损伤;因此本项目揭示:CTRP3介导 LAMP1/JIP2/JNK保护心肌缺血/再灌注损伤。为冠心病的防治提供新的证据。.长链非编码RNA-小核RNA宿主基因9(lncRNA-SNHG9)在脂肪细胞分化中起重要的作用。外泌体lncRNA-SNHG9在肥胖患者内皮功能紊乱中的作用不明确。本项目发现:lncRNA-SNHG9在肥胖伴有内皮功能紊乱的患者中降低。脂肪细胞来源的外泌体lncRNA-SNHG9减轻内皮细胞的炎症和凋亡。免疫共沉淀证实SNHG9和TRADD相结合。抑制TRADD减少脐静脉内皮细胞的炎症和凋亡。过表达TRADD减低SNHG9对内皮细胞功能紊乱的保护作用。因此SNHG9结合TRADD保护内皮功能紊乱。
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数据更新时间:2023-05-31
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