Abstract
Background: Ischemic stroke is a major cause of death and disability worldwide and results from inadequate cerebrovascular blood supply; mitochondrial dysfunction plays an essential role in its pathogenesis. DL-3-n-butylphthalide (NBP) is an effective medicine for ischemic stroke that reduces cell apoptosis and improves long-term prognosis.
Objective: Whether and how NBP regulates mitochondria-associated apoptosis in cerebral ischemia- reperfusion injury remains unclear.
Methods: Male Sprague Dawley rats were subjected to a middle cerebral artery occlusion (MCAO) stroke and treated with low (20 mg/kg) or high (80 mg/kg) concentrations of NBP. The Omi/HtrA2 inhibitor UCF-101 was used as a positive control. Cerebral infarction, neuron injury and neuronal apoptosis were assessed to determine the efficacy of NBP compared to UCF-101. We assessed the expression of the Omi/HtrA2 signaling pathway by western blotting and tested the mRNA expression of mitochondrial metabolism-related genes by PCR.
Results: Compared to the MCAO group, both low and high concentrations of NBP substantially improved cerebral infarction, neuron injury, and neuronal apoptosis; high concentrations of NBP were more potent than low concentrations. The expression of proteins of the mitochondrial Omi/HtrA2 signaling pathway, including Omi/HtrA2, XIAP, PARL, OPA1, CHOP, and ClpP, was inhibited in the NBP group.
Conclusion: Overall, early application of NBP attenuated cerebral ischemia-reperfusion injury by inhibiting mitochondrial Omi/HtrA2-mediated apoptosis in rats. Our study supports a novel neuroprotective mechanism of NBP, making it a promising therapeutic agent for ischemic stroke.
[http://dx.doi.org/10.1016/S1474-4422(19)30034-1] [PMID: 30871944]
[http://dx.doi.org/10.4103/bc.bc_31_20] [PMID: 33210036]
[http://dx.doi.org/10.1136/jnnp-2020-324283] [PMID: 33148815]
[http://dx.doi.org/10.4103/bc.bc_69_20] [PMID: 33506147]
[PMID: 24034078]
[PMID: 24034079]
[http://dx.doi.org/10.1038/s41401-020-00583-3] [PMID: 33462377]
[http://dx.doi.org/10.3389/fimmu.2021.794770] [PMID: 34925379]
[http://dx.doi.org/10.1038/nature05292] [PMID: 17051205]
[http://dx.doi.org/10.3389/fnmol.2019.00048] [PMID: 30853894]
[http://dx.doi.org/10.1161/01.STR.17.3.472] [PMID: 3715945]
[http://dx.doi.org/10.1007/s12035-018-1383-3] [PMID: 30361890]
[http://dx.doi.org/10.1016/S1097-2765(02)00658-5] [PMID: 12408815]
[http://dx.doi.org/10.1074/jbc.M109721200] [PMID: 11606597]
[http://dx.doi.org/10.1128/MCB.24.22.9848-9862.2004] [PMID: 15509788]
[http://dx.doi.org/10.1161/STROKEAHA.108.531632] [PMID: 19182083]
[http://dx.doi.org/10.1007/s11357-012-9406-x] [PMID: 22535253]
[http://dx.doi.org/10.1038/sj.cdd.4401955] [PMID: 16691211]
[http://dx.doi.org/10.1016/j.intimp.2013.03.019] [PMID: 23557966]
[http://dx.doi.org/10.1038/sj.onc.1210042] [PMID: 17130845]
[http://dx.doi.org/10.1371/journal.pone.0183680] [PMID: 28841673]
[http://dx.doi.org/10.1038/cdd.2008.166] [PMID: 19023330]
[http://dx.doi.org/10.1016/j.bbamcr.2016.11.022] [PMID: 27890624]
[http://dx.doi.org/10.1083/jcb.200704110] [PMID: 17709429]
[http://dx.doi.org/10.1038/jcbfm.2013.139] [PMID: 23921894]
[http://dx.doi.org/10.1016/j.cmet.2021.03.006] [PMID: 33798471]
[http://dx.doi.org/10.1172/JCI123027] [PMID: 30431439]
[http://dx.doi.org/10.1007/s13238-019-0636-x] [PMID: 31134526]
[http://dx.doi.org/10.1080/00207454.2019.1692835] [PMID: 31822157]
[PMID: 29077149]
[http://dx.doi.org/10.1016/j.brainres.2009.07.020] [PMID: 19616517]