蛇葡萄素通过调节JAK2/STAT3信号通路减轻OGD/R诱导的神经元损伤

Ampelopsin alleviates OGD/R induced neuronal damage by regulating JAK2/STAT3 signaling pathway

目的探讨蛇葡萄素(AMP)对氧糖剥夺/再灌注(OGD/R)诱导的神经元损伤的影响及其作用机制,为新生儿缺氧缺血性脑损伤的研究奠定基础。方法分离并体外培养新生SD大鼠神经元细胞,分为5组:对照组(AMP浓度为0μmol/L)、OGD/R组、AMP低剂量组(OGD/R处理+AMP 20μmol/L)、AMP高剂量组(OGD/R处理+AMP 30μmol/L)、JAK2/STAT3激活剂组(OGD/R处理+AMP 30μmol/L+Coumermycin A110μmol/L)。CCK-8法检测不同处理组细胞活力;乳酸脱氢酶(LDH)试剂盒检测培养基中LDH活性;流式细胞术检测细胞凋亡率;酶联免疫吸附试验检测白细胞介素6(IL-6)、白细胞介素10(IL-10)、肿瘤坏死因子α(TNF-α)水平;试剂盒检测活性氧(ROS)、丙二醛(MDA)、超氧化物歧化酶(SOD)水平;Western blotting检测凋亡相关蛋白B淋巴细胞瘤-2(Bcl-2)、Bcl-2相关X蛋白(Bax)、酶切含半胱氨酸的天冬氨酸蛋白水解酶-3(C-caspase-3)、酪氨酸激酶2(JAK2)、磷酸化JAK2(p-JAK2)、信号传导及转录活化因子3(STAT3)、磷酸化STAT3(p-STAT3)表达情况。结果与AMP浓度为0μmol/L比较,AMP浓度为5~30μmol/L时,细胞活力比较差异无统计学意义(P>0.05),AMP浓度为40μmol/L细胞活力明显下降(P<0.05)。与对照组比较,OGD/R组细胞活力、SOD、IL-10、Bcl-2水平明显下降,LDH活性、细胞凋亡率、ROS荧光强度、MDA、IL-6、TNF-α、Bax、C-caspase-3、p-JAK2/JAK2、p-STAT3/STAT3水平明显升高(P<0.05)。与OGD/R组比较,AMP低、高剂量组神经元细胞活力、SOD、IL-10、Bcl-2水平上升,LDH活性、细胞凋亡率、ROS荧光强度、MDA、IL-6、TNF-α、Bax、C-caspase-3、p-JAK2/JAK2、p-STAT3/STAT3水平下降(P<0.05),而JAK2/STAT3激活剂可逆转AMP对OGD/R诱导的神经元细胞损伤的保护作用。结论AMP通过减少氧化应激和炎症反应减轻OGD/R诱导的神经元细胞损伤,其作用机制可能与抑制JAK2/STAT3信号通路磷酸化有关。

Objective To investigate the impact of ampelopsin(AMP)on oxygen glucose deprivation/reperfusion(OGD/R)induced neuronal damage and its mechanism,and to lay a foundation for the study of neonatal hypoxic-ischemic brain damage.Methods Neurons of newborn SD rats were isolated and cultured in vitro,and they were divided into 5 groups:control group(AMP 0μmol/L),OGD/R group,low dose AMP group(OGD/R+AMP 20μmol/L),high dose AMP group(OGD/R+AMP 30μmol/L)and JAK2/STAT3 activator group(OGD/R+AMP 30μmol/L+Coumermycin A110μmol/L).CCK-8 method was used to detect the cell viability of different treatment groups,the lactate dehydrogenase(LDH)kit was used to detect the cell activity of LDH in the medium,flow cytometry was used to detect the apoptosis rate,enzyme-linked immunosorbent assay was used to detect the levels of interleukin-6(IL-6),interleukin-10(IL-10)and tumor necrosis factorα(TNF-α),the kit was used to detect the levels of reactive oxygen species(ROS),malondialdehyde(MDA)and superoxide dismutase(SOD),and Western blotting was used to detect the expression of apoptosis related proteins B-cell lymphoma-2(Bcl-2),Bcl-2 associated X protein(Bax),enzymatic cleavage of cysteine containing aspartate protein hydrolase-3(C-caspase-3),tyrosine kinase 2(JAK2),phosphorylated JAK2(p-JAK2),signal transduction and transcription activating factor 3(STAT3)and phosphorylated STAT3(p-STAT3).Results Compared with the concentration of AMP of 0μmol/L,the cell viability in concentration of AMP of 5-30μmol/L was not obvious different(P>0.05),when the concentration of AMP was 40μmol/L,the cell viability decreased obviously(P<0.05).Compared with the control group,the cell viability,the levels of SOD fluorescence intensity,IL-10 and Bcl-2 in OGD/R group decreased obviously,the LDH activity,cell apoptosis rate,the levels of ROS,MDA,IL-6,TNF-α,Bax,C-caspase-3,p-JAK2/JAK2,and p-STAT3/STAT3 increased obviously(P<0.05).Compared with OGD/R group,the cell viability,the levels of SOD fluorescence intensity,IL-10 and Bcl-2 in low and high dose AMP groups increased,the LDH activity,cell apoptosis rate,the levels of ROS,MDA,IL-6,TNF-α,Bax,C-caspase-3,p-JAK2/JAK2,and p-STAT3/STAT3 decreased(P<0.05),and JAK2/STAT3 activator was able to reverse the protective effect of AMP on OGD/R induced neuronal.Conclusion AMP attenuates OGD/R induced neuronal by reducing oxidative stress and inflammatory response,and its mechanism may be related to inhibition of JAK2/STAT3 signal pathway phosphorylation.