Abstract
This study aimed to investigate the synergic effects of tetramethylpyrazine phosphate (TMPP) and borneol (BO) for protecting against ischemia in the cortex and hippocampus. A rat model of global cerebral ischemia-reperfusion (GCIR) was induced by four-vessel occlusion. The results showed that TMPP (13.3 mg/kg), BO (0.16 g/kg), and their combination improved the ultrastructure of neurons, reduced the apoptosis index, and reduced the intracellular calcium content in both the cortex and hippocampus. TMPP and the combined treatment increased cortex autophagy by modulating phosphorylated adenosine monophosphate-activated protein kinase (pAMPK) in the pAMPK-mammalian target of rapamycin (mTOR)-Unc-51-like kinase 1 (ULK1) signaling pathway, whereas BO only regulated ULK1. Moreover, BO increased neuron autophagy in the hippocampus by modulating mTOR, whereas TMPP targeted both mTOR and Beclin1. Similarly, the combination targeted both pAMPK and Beclin1. All three treatments decreased the expression of p53 and caspase-3 in the two areas. Additionally, TMPP and the combined therapy regulated Bax and Bcl-2. These results demonstrated the synergic effects between TMPP and BO for treating ischemia-reperfusion injury in the cortex and hippocampus regions. Their neuroprotective effects could be partly attributed to switching from apoptosis to protective autophagy. Additionally, the potential mechanism triggering this switching could be ascribed to the reduction of intracellular calcium content.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (81573713), the Basic Research Project of Jiangsu Province (BK20151564, BK20150088), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the Qing Lan Project of Jiangsu Province, the Innovated Team of the Education Department of Guizhou Province (2014–31), the Scientific and Technologic Innovated Team of Guizhou Province (2015–4025), the High Level Innovation Talents (2015–4029), the 2011 Modern Drug of Cooperation Innovation ([2013]04), and the Jiangsu Provincial Key Construction Laboratory (No. SuJiaoKe[2016]8).
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The study was approved by the Animal Ethics Committee of Nanjing University of Chinese Medicine. The care and use of the rats were approved by the Animal Ethics Committee of the Nanjing University of Chinese Medicine, and the experiment was strictly performed according to the guidelines of laboratory animal care (Institute of Laboratory Animal Resources, Commission on Life Sciences, National Research Council, 1996).
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Yu, B., Ruan, M., Liang, T. et al. The Synergic Effect of Tetramethylpyrazine Phosphate and Borneol for Protecting Against Ischemia Injury in Cortex and Hippocampus Regions by Modulating Apoptosis and Autophagy. J Mol Neurosci 63, 70–83 (2017). https://doi.org/10.1007/s12031-017-0958-1
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DOI: https://doi.org/10.1007/s12031-017-0958-1