Dexmedetomidine Can Enhance PINK1/Parkin- Mediated Mitophagy in MPTP-Induced PD Mice Model by Activating AMPK

作者全名："Chen, Cheng; Chen, Yaohua; Liu, Tingting; Song, Dan; Ma, Di; Cheng, Oumei"

作者地址："[Chen, Cheng; Chen, Yaohua; Liu, Tingting; Song, Dan; Ma, Di; Cheng, Oumei] Chongqing Med Univ, Dept Neurol, Affiliated Hosp 1, Chongqing 400016, Peoples R China; [Chen, Cheng; Chen, Yaohua; Liu, Tingting; Song, Dan; Ma, Di] Chongqing Med Univ, Lab Res Ctr, Affiliated Hosp 1, Chongqing 400016, Peoples R China"

通信作者："Cheng, OM (通讯作者)，Chongqing Med Univ, Dept Neurol, Affiliated Hosp 1, Chongqing 400016, Peoples R China."

来源：OXIDATIVE MEDICINE AND CELLULAR LONGEVITY

ESI学科分类：MOLECULAR BIOLOGY & GENETICS

WOS号：WOS:000920197300001

JCR分区：Q2

影响因子：7.31

年份：2022

卷号：2022

期号：　

开始页：　

结束页：　

文献类型：Article

关键词：　

摘要："Parkinson's disease (PD) is a common neurodegenerative disease characterized by the degeneration of dopaminergic (DA) neurons in the substantia nigra (SN). Our previous study has shown that dexmedetomidine (Dex) can protect mitochondrial function and reduce apoptosis in MPP+-induced SH-SY5Y cells. Evidences have shown that mitophagy is related to the development of PD. In this study, we investigated whether Dex can enhance mitophagy in MPTP-induced mice to play a neuroprotective effect. In our experiment, mice were injected with MPTP 30 mg/kg intraperitoneally for 5 consecutive days to establish a PD subacute model. Dex (30, 50, and 100 mu g/kg) was injected intraperitoneally 30 minutes before each injection of MPTP, respectively. Our results showed that Dex (50 mu g/kg) most significantly attenuated MPTP-induced motor dysfunction and restored TH-positive neurons in the SN, increased the expression of the antiapoptotic protein Bcl-2, and decreased the expression of apoptotic proteins cleaved casepase3, cleaved casepase9, and Bax. Moreover, Dex increased the activity of mitochondrial Complexes I-IV and decreased the level of oxidative stress, manifesting as decreased MDA levels and increased SOD and GSH-PX levels. Besides, under transmission electron microscopy, Dex increased the mitophagosome which is an autophagosome with a mitochondrion-like structure inside under the electron microscope. In addition, Dex could also increase the expression of mitophagy-related proteins p-AMPK, LC3II/I, PINK1, and Parkin and decrease P62. However, after using Compound C (CC, 10 mg/kg, AMPK inhibitor), the effects of Dex on increasing PINK1/Parkin-induced mitophagy and neuroprotection were attenuated. In conclusion, Dex may improve mitochondrial function by activating AMPK to enhance PINK1/Parkin-induced mitophagy, thereby protecting dopaminergic neurons."

基金机构："National Natural Science Foundation of China [81871002, 81471334, 81100981]; National Key Clinical Specialties Construction Program of China"

基金资助正文："This research was supported by research grants from the National Natural Science Foundation of China (grant number No. 81871002, 81471334, and 81100981) and the National Key Clinical Specialties Construction Program of China."