Abstract
Objective
We previously reported that mutations in inner mitochondrial membrane peptidase 2-like (Immp2l) increase infarct volume, enhance superoxide production, and suppress mitochondrial respiration after transient cerebral focal ischemia and reperfusion injury. The present study investigated the impact of heterozygous Immp2l mutation on mitochondria function after ischemia and reperfusion injury in mice.
Methods
Mice were subjected to middle cerebral artery occlusion for 1 h followed by 0, 1, 5, and 24 h of reperfusion. The effects of Immp2l+/− on mitochondrial membrane potential, mitochondrial respiratory complex III activity, caspase-3, and apoptosis-inducing factor (AIF) translocation were examined.
Results
Immp2l+/− increased ischemic brain damage and the number of TUNEL-positive cells compared with wild-type mice. Immp2l+/− led to mitochondrial damage, mitochondrial membrane potential depolarization, mitochondrial respiratory complex III activity suppression, caspase-3 activation, and AIF nuclear translocation.
Conclusion
The adverse impact of Immp2l+/− on the brain after ischemia and reperfusion might be related to mitochondrial damage that involves depolarization of the mitochondrial membrane potential, inhibition of the mitochondrial respiratory complex III, and activation of mitochondria-mediated cell death pathways. These results suggest that patients with stroke carrying Immp2l+/− might have worse and more severe infarcts, followed by a worse prognosis than those without Immp2l mutations.
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Conflict of Interest Statement
The authors declared no potential conflicts of interest with respect to the research, authorship, or publication of this article.
This study was supported by the National Natural Science Foundation of China (Nos. 81360196, 81760240), the Natural Science Foundation of Ningxia (No. 2022AAC03159), and the Ningxia Innovation Team of the Foundation and Clinical Research of Diabetes and Its Complications (No. NXKJT2019010).
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Ma, Y., Liang, Rm., Ma, N. et al. Immp2l Mutation Induces Mitochondrial Membrane Depolarization and Complex III Activity Suppression after Middle Cerebral Artery Occlusion in Mice. CURR MED SCI 43, 478–488 (2023). https://doi.org/10.1007/s11596-023-2726-5
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DOI: https://doi.org/10.1007/s11596-023-2726-5