Tomatidine protects against ischemic neuronal injury by improving lysosomal function

被引：23

作者：

Ahsan, Anil ^{[1
]}

Zheng, Yanrong ^{[1
]}

Ma, Shijia ^{[1
]}

Liu, Mengru ^{[1
]}

Cao, Ming ^{[1
]}

Li, Yue ^{[1
]}

Zheng, Wanqing ^{[1
]}

Zhou, Xinyu ^{[1
]}

Xin, Minhang ^{[1
]}

Hu, Wei-wei ^{[1
]}

Chen, Zhong ^{[1
]}

Zhang, Xiangnan ^{[1
]}

机构：

[1] Zhejiang Univ, Inst Pharmacol & Toxicol, Coll Pharmaceut Sci, Key Lab Med Neurobiol,Minist Hlth China, Hangzhou 310058, Peoples R China

来源：

EUROPEAN JOURNAL OF PHARMACOLOGY | 2020年 / 882卷

基金：

中国国家自然科学基金;

关键词：

Autophagy flux; Cerebral ischemia; TFEB; Neuroprotection; Tomatidine; Lysosomal activation; FOCAL CEREBRAL-ISCHEMIA; NF-KAPPA-B; AUTOPHAGY; MITOCHONDRIAL; INHIBITION; ACTIVATION; MITOPHAGY; TFEB; SUPPRESSION; DYSFUNCTION;

D O I：

10.1016/j.ejphar.2020.173280

中图分类号：

R9 [药学];

学科分类号：

1007 ;

摘要：

Cerebral ischemia is a severe neurological disorder with limited therapy. Autophagy refers to the intracellular degradation process via an autophagosome-lysosome pathway. Emerging studies indicated the neuroprotective effects of autophagy against ischemic neuronal injury, suggesting the potential neuroprotection of autophagy-inducing compounds. Tomatidine is a gut microbiota-derived metabolite from unripe tomatoes. Tomatidine activates autophagy either in mammal cells or C elegans. However, potential neuroprotection of tomatidine against ischemic neuronal injury has not been determined. In the present investigation, N2a cells and primary cultured mice cortical neurons were subjected to oxygen-glucose deprivation followed by reperfusion (OGD/R). Cell injury was determined by MTT and lactate dehydrogenase release. Autophagosomes and autolysosomes were visualized by transfecting mCherry-GFP-tandem fluorescent LC3. The protein levels of LC3, Cathepsin D, Cathepsin B, and transcription factor EB (TFEB) were detected by Western blot. Lysosomes were stained with LysoTracker Red and dequenched-bovine serum albumin (DQ-BSA red). Tomatidine alleviated OGD/R-induced injury in N2a cells and neurons. Interestingly, tomatidine treatment attenuated, rather than reinforced, the OGD/ R-elevated LC3-II, which can be reversed by lysosome inhibitor. These results indicated enhanced lysosomal activity rather than autophagosome generation with tomatidine treatment in our models. Indeed, tomatidine increased the lysosome number, proteolytic activities, as well as the expression of Cathepsin D and Cathepsin B. In addition, tomatidine increased the expression and nucleus translocation of (TFEB). Besides, lysosomal in-hibitors chloroquine and bafilomycin, but not wortmannin, abolished the protection of tomatidine. In conclu-sion, the present study revealed the neuroprotection of tomatidine against ischemic injury by promoting lyso-somal activity, possibly with the involvement of TFEB-related mechanisms.

引用

页数：11

共 52 条

[1] Urolithin A-activated autophagy but not mitophagy protects against ischemic neuronal injury by inhibiting ER stress in vitro and in vivo [J].