Abstract
Mdivi-1 is a selective inhibitor of mitochondrial fission protein, Drp1, and can penetrate the blood–brain barrier. Previous studies have shown that Mdivi-1 improves neurological outcomes after ischemia, seizures and trauma but it remains unclear whether Mdivi-1 can attenuate early brain injury after subarachnoid hemorrhage (SAH). We thus investigated the therapeutic effect of Mdivi-1 on early brain injury following SAH. Rats were randomly divided into four groups: sham; SAH; SAH + vehicle; and SAH + Mdivi-1. The SAH model was induced by standard intravascular perforation and all of the rats were subsequently sacrificed 24 h after SAH. Mdivi-1 (1.2 mg/kg) was administered to rats 30 min after SAH. We found that Mdivi-1 markedly improved neurologic deficits, alleviated brain edema and BBB permeability, and attenuated apoptotic cell death. Mdivi-1 also significantly reduced the expression of cleaved caspase-3, Drp1 and p-Drp1(Ser616), attenuated the release of Cytochrome C from mitochondria, inhibited excessive mitochondrial fission, and restored the ultra-structure of mitochondria. Furthermore, Mdivi-1 reduced levels of MDA, 3-NT, and 8-OHdG, and improved SOD activity. Taken together, our data suggest that Mdivi-1 exerts neuroprotective effects against cell death induced by SAH and the underlying mechanism may be inhibition of Drp1-activated mitochondrial fission and oxidative stress.
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Abbreviations
- SAH:
-
Subarachnoid hemorrhage
- Drp1:
-
Dynamin-like protein 1
- EBI:
-
Early brain injury
- ECA:
-
External carotid artery
- ICA:
-
Internal carotid artery
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Acknowledgements
This research was supported in part by the Innovative Science Research Foundation of Harbin Medical University [Grant Number 2016LCZX59], the National Natural Science Foundation of China [Grant Number 81401009], and the Natural Science Foundation of Heilongjiang Province [grant number QC2013C088]. We thank Professor Zhang for help in designing experiments and advice about the manuscript.
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Wu, P., Li, Y., Zhu, S. et al. Mdivi-1 Alleviates Early Brain Injury After Experimental Subarachnoid Hemorrhage in Rats, Possibly via Inhibition of Drp1-Activated Mitochondrial Fission and Oxidative Stress. Neurochem Res 42, 1449–1458 (2017). https://doi.org/10.1007/s11064-017-2201-4
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DOI: https://doi.org/10.1007/s11064-017-2201-4