期刊
FREE RADICAL BIOLOGY AND MEDICINE
卷 162, 期 -, 页码 523-532出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2020.11.009
关键词
Mitochondrial permeability transition pore; Non-alcoholic fatty liver disease; Arochidonic acid; Electrophysiological morphology; Mouse
资金
- National Key Basic Research Program of China [2013CB531206]
- National Natural Science Foundation of China [81170236]
Through studying in diabetes mice, we found that mPTP plays an important role in hepatic steatosis and can be directly induced by arachidonic acid, which can be inhibited by cyclosporine A.
Mitochondrial permeability transition pore (mPTP) is an important regulator in cell apoptosis and necrosis. However, its role in hepatic steatosis, especially its electrophysiological properties transformation remains elusive. Herein, using diabetes mice, we investigated the role of mPTP in hepatic steatosis triggered by diabetes and the mechanisms involved. We found that hepatic steatosis altered mitochondrial morphology, generating mega mitochondria, mitochondria swelling, calcein fluorescence quenching and mitochondrial membrane potential depolarization. At the same time, we confirmed an augmented mPTP opening with patch clamping in liver mitoplasts in db/db mice and a similar transformation with arachidonic acid (AA) simulating liquid deposition. We also found mPTP opening was significantly attenuated in wt mice after removing mitochondrial matrix, while that in db/db mice remained active. In addition, we observed that AA could directly activate mPTP in inside-out mode, independent of matrix calcium. In conclusion, we for the first time provided a physiological evidence of mPTP opening in lipid deposition, which could be directly induced by AA without Ca2+ and can be inhibited by cyclosporine A. As a result, it led to mitochondria morphology and function transformation. This might provide insights into potential therapeutic target for future treatment of mitochondrial liver disease.
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