ATP depletion is one of the pathological bases in cerebral ischemia.Electro-acupuncture(EA)is widely used in clinical practice for ischemia.However,the mechanism of EA remains unclear.The purpose of this study was to ...ATP depletion is one of the pathological bases in cerebral ischemia.Electro-acupuncture(EA)is widely used in clinical practice for ischemia.However,the mechanism of EA remains unclear.The purpose of this study was to investigate whether EA could activate the AMPK/PGC-1α/TFAM signaling pathway and,consequently,increase the preservation of ATP in rats with ischemia.In this study,48 rats were randomly divided into four groups as a sham-operation control group(sham group),a middle cerebral artery occlusion group(MCAO group),an EA group,and an EA group blocked by the AMPK inhibitor compound C(EA+CC group)(N=12/group).The rats of the EA group and EA+CC group received the EA treatment for 7 days.The rats that belonged in the two remaining groups were only grasped in the same condition.Then,their brain tissues were collected for further detection.When compared with other groups,EA significantly reduced neurological deficits score and increased motor function.The cerebral infarction volume was significantly reduced in the EA group according to TTC staining.With western blot,we found that EA improved the ratio of p-AMPKα/AMPKα(P<0.05),however,there is no difference between the MCAO group and sham group(P>0.05).In addition,EA also increased the expression of PGC-1αand TFAM(all P<0.05).By Elisa,we observed that EA increased the preservation of ATP(P<0.05)and mitochondrial respiratory enzymes,including Complex I(P<0.05),Complex IV(P<0.05),but not Complex III(P>0.05).In summary,we conclude that EA may protect against ischemic damage in MCAO rats,improve the preservation of ATP and mitochondrial respiratory enzymes.This effect may be positively regulated by the activation of the PGC-1α/TFAM signaling pathway.展开更多
目的通过动物和体外培养的软骨细胞观察糖基化终末产物(advanced glycation end products,AGEs)对软骨细胞线粒体功能的损伤作用,并探讨相关机制。方法小鼠膝关节腔直接注射AGEs,番红O-固绿染色评估病理学改变;JC-1检测线粒体膜电位ΔΨ...目的通过动物和体外培养的软骨细胞观察糖基化终末产物(advanced glycation end products,AGEs)对软骨细胞线粒体功能的损伤作用,并探讨相关机制。方法小鼠膝关节腔直接注射AGEs,番红O-固绿染色评估病理学改变;JC-1检测线粒体膜电位ΔΨm;Western blot检测腺苷酸活化蛋白激酶(adenosine monophosphate-activated protein kinase,AMPK)、过氧化物酶体增殖物激活受体γ辅助活化因子α(peroxisome proliferator-activated receptorγcoactivator-1α,PGC-1α)、去乙酰化酶3(sirtuin3,SIRT3)及基质金属蛋白酶(matrix metalloproteinase,MMP)-3、-13的表达。结果膝关节注射AGEs 8周后,小鼠出现骨关节炎样病理改变;在体外培养的软骨细胞中,AGEs可以损伤线粒体功能,同时p-AMPK、SIRT3和PGC-1α的表达减少;给予AMPK选择性激动剂AICAR则可以拮抗AGEs的上述作用,而特异性敲除SIRT3或PGC-1α后,AICAR此拮抗作用减弱。结论AGEs可能通过下调AMPK-PGC-1α-SIRT3信号通路诱导软骨细胞线粒体功能损伤,进而促进OA病变。展开更多
基金supported by the National Natural Science Foundation of China(No.81574048 and No.81904268)Key personnel training project of Health Care in middle-aged and young people in Fujian province(No.2019-ZQN-81).
文摘ATP depletion is one of the pathological bases in cerebral ischemia.Electro-acupuncture(EA)is widely used in clinical practice for ischemia.However,the mechanism of EA remains unclear.The purpose of this study was to investigate whether EA could activate the AMPK/PGC-1α/TFAM signaling pathway and,consequently,increase the preservation of ATP in rats with ischemia.In this study,48 rats were randomly divided into four groups as a sham-operation control group(sham group),a middle cerebral artery occlusion group(MCAO group),an EA group,and an EA group blocked by the AMPK inhibitor compound C(EA+CC group)(N=12/group).The rats of the EA group and EA+CC group received the EA treatment for 7 days.The rats that belonged in the two remaining groups were only grasped in the same condition.Then,their brain tissues were collected for further detection.When compared with other groups,EA significantly reduced neurological deficits score and increased motor function.The cerebral infarction volume was significantly reduced in the EA group according to TTC staining.With western blot,we found that EA improved the ratio of p-AMPKα/AMPKα(P<0.05),however,there is no difference between the MCAO group and sham group(P>0.05).In addition,EA also increased the expression of PGC-1αand TFAM(all P<0.05).By Elisa,we observed that EA increased the preservation of ATP(P<0.05)and mitochondrial respiratory enzymes,including Complex I(P<0.05),Complex IV(P<0.05),but not Complex III(P>0.05).In summary,we conclude that EA may protect against ischemic damage in MCAO rats,improve the preservation of ATP and mitochondrial respiratory enzymes.This effect may be positively regulated by the activation of the PGC-1α/TFAM signaling pathway.
