摘要
目的:探究Apelin-13调节肽对脑缺血再灌注(I/R)损伤模型小鼠神经细胞焦亡的影响.方法:利用大脑中动脉栓塞再灌注法(MCAO/R)制备小鼠I/R损伤模型,氧糖剥夺/复氧(OGD/R)法制备HT22细胞损伤模型,同时给予Apelin-13处理.神经功能缺损评分评估小鼠神经功能;苏木精-伊红染色法(HE)和尼氏染色观察小鼠脑梗死区组织形态变化;2,3,5氯化三苯基四氮唑(TTC)染色观察脑梗死体积;Western Blot检测梗死区脑组织或者HT22细胞中NOD样受体热蛋白结构域相关蛋白3(NLRP3)、消皮素D(GSDMD)、胱天蛋白酶1(caspase-1)、凋亡相关斑点样蛋白(ASC)、白细胞介素1β(IL-1β)和白细胞介素18(IL-18)等分子的表达;酶联免疫吸附实验(ELISA)检测小鼠血清及培养上清中IL-1β和IL-18的水平;用CCK-8试剂盒和乳酸脱氢酶(LDH)检测试剂盒分别检测HT22细胞活性和细胞损伤;caspase-1活性检测试剂盒检测HT22细胞中caspase-1的活性;免疫荧光染色观察HT22细胞中caspase-1和GSDMD表达.结果:Apelin-13可显著改善I/R小鼠神经功能和脑梗死体积,减轻梗死区病理损伤.同时降低血清中IL-1β和IL-18的水平.此外,Apelin-13可降低小鼠脑梗死区NLRP3、GSDMD、caspase-1、IL-1β、IL-18等分子的表达.体外实验表明Apelin-13可显著增加OGD/R处理的HT22细胞活力,降低caspase-1活性,并减少LDH含量,同时降低OGD/R处理的HT22细胞中NL-RP3、GSDMD、caspase-1、IL-1β、IL-18 等分子的表达.结论:Apelin-13 可通过 NLRP3/caspase-1/GSDMD 通路抑制脑缺血再灌注损伤小鼠细胞焦亡,进而发挥神经保护作用.
Abstract
Objective:To investigate the effects of Apelin-13 regulatory peptide on neuronal cell pyroptosis in mice modeled with cerebral ischemia-reperfusion(I/R).Methods:We prepared a mouse cerebral I/R model using middle cerebral artery embolization and Reperfusion(MCAO/R).The HT22 cell injury model was prepared by the oxygen glu-cose deprivation/reoxygenation(OGD/R),and Apelin-13 treatment was also given.Neurological function was assessed by neurological deficit score;hematoxylin-eosin(HE)staining and Nissl staining were used to observe the morphologic changes of the infarcted area of the mice;and 2,3,5triphenyltetrazolium chloride(TTC)staining was used to observe the volume of cerebral infarcts;The expression of NOD-like receptor thermoprotein structural domain-related protein 3(NLRP3),gasdermin D(GSDMD),caspase-1,apoptosis-associated speck-like protein(ASC),interleukin 1β(IL-1β),and interleukin 18(IL-18)in brain tissues from infarcted areas or HT22 cells was detected by Western Blot,and IL-1β and IL-18 were detected by enzyme-linked immunosorbent assay(ELISA)in serum of mice and culture supema-tants;The cell viability and cell damage of HT22 were detected by CCK-8 kit and lactate dehydrogenase(LDH)assay kit,respectively;caspase-1 activity was measured by caspase-1 activity kit in HT22 cells;and the expression of caspase-1 and GSDMD was observed by immunofluorescence staining in HT22 cells.Results:Apelin-13 significantly improved neurological function and cerebral infarct volume in I/R mice,and attenuated pathological damage in the in-farcted area.It also reduced the serum levels of IL-1β and IL-18.In addition,Apelin-13 reduced the expression of mol-ecules such as NLRP3,GSDMD,caspase-1,IL-1β,and IL-18 in the cerebral infarct area of mice.In vitro experiments showed that Apelin-13 significantly increased the viability of OGD/R-treated HT22 cells,decreased caspase-1 activity,and reduced the LDH content,as well as decreased the expression of molecules such as NLRP3,GSDMD,caspase-1,IL-1β,IL-18,and so on,in OGD/R-treated HT22 cells.Conclusion:Apelin-13 inhibits pyroptosis through the NL-RP3/caspase-1/GSDMD pathway in cerebral ischemia/reperfusion mice and thus exerts neuroprotective effects.
基金项目
国家自然科学基金(82101410)
山东省医药卫生科技发展计划(202101040805)
维普
万方数据