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TRPC3/6/7 Knockdown Protects the Brain from Cerebral Ischemia Injury via Astrocyte Apoptosis Inhibition and Effects on NF-кB Translocation

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Abstract

Ischemia contributes significantly to morbidity and mortality associated with many common neurological diseases. Calcium overload is an important mechanism of cerebral ischemia and reperfusion (I/R) injury. Despite decades of intense research, an effective beneficial treatment of stroke remains limited; few therapeutic strategies exist to combat the consequences of cerebral ischemia. Traditionally, a “neurocentric” view has dominated research in this field. Evidence is now accumulating that glial cells, especially astrocytes, play an important role in the pathophysiology of cerebral ischemia. Here, we show that transient receptor potential (TRP)C3/6/7 knockout (KO) mice subjected to an I/R procedure demonstrate ameliorated brain injury (infract size), compared to wild-type (WT) control animals. This is accompanied by reduction of NF-кB phosphorylation and an increase in protein kinase B (AKT) phosphorylation in I/R-injured brain tissues in TRPC3/6/7 KO mice. Also, the expression of pro-apoptotic protein Bcl-2 associated X (Bax) is down-regulated and that of anti-apoptotic protein Bcl-2 is upregulated in TRPC3/6/7−/− mice. Astrocytes isolated from TRPC3/6/7 KO mice and subjected to oxygen/glucose deprivation and subsequent reoxygenation (OGD-R, mimicking in vivo I/R injury) also exhibit enhanced Bcl-2 expression, reduced Bax expression, enhanced AKT phosphorylation, and reduced NF-кB phosphorylation. Furthermore, apoptotic rates of TRPC3/6/7 KO astrocytes cultured in OGD-R conditions were reduced significantly compared to WT control. These findings suggest TRPC3/6/7 channels play a detrimental role in brain I/R injury. Deletion of these channels can interfere with the activation of NF-кB (pro-apoptotic), promote activation of AKT (anti-apoptotic), and ultimately, ameliorate brain damage via inhibition of astrocyte apoptosis after cerebral ischemia/reperfusion injury.

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Acknowledgments

This research was supported by National Natural Science Foundation of China (Grant 31171087 and Grant 30970662 to YH Liao), and NIH intramural Research Program (Project Z01-ES-101684 to LB).

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Authors and Affiliations

  1. Department of Anatomy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China

    Xiaoyun Chen, Min Lu, Xiju He, Le Ma & Yanhong Liao

  2. Brain Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China

    Xiaoyun Chen, Min Lu, Xiju He, Le Ma & Yanhong Liao

  3. Neurobiology Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, Durham, NC, 27709, USA

    Lutz Birnbaumer

  4. Institute of Biomedical Research (BIOMED), Catholic University of Argentina, C1107AFF, Buenos Aires, Argentina

    Lutz Birnbaumer

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  1. Xiaoyun Chen
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  2. Min Lu
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  3. Xiju He
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  4. Le Ma
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Correspondence to Yanhong Liao.

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Animals were treated in compliance with the Guide for the Care and Use of Laboratory Animals (National Academy of Science). All animal studies were approved by the Animal Care and Utilization Committee of Huazhong University of Science and Technology.

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Xiaoyun Chen and Min Lu contributed equally to this work

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Chen, X., Lu, M., He, X. et al. TRPC3/6/7 Knockdown Protects the Brain from Cerebral Ischemia Injury via Astrocyte Apoptosis Inhibition and Effects on NF-кB Translocation. Mol Neurobiol 54, 7555–7566 (2017). https://doi.org/10.1007/s12035-016-0227-2

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