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Resveratrol Downregulates STAT3 Expression and Astrocyte Activation in Primary Astrocyte Cultures of Rat

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Abstract

Astrocytes respond to all forms of central nervous system (CNS) insults by a process referred to as reactive astrogliosis. Inhibition of astrocyte growth and activation is an important strategy for promoting injured CNS repair. STAT3 (signal transducer and activator of transcription 3) is reported to be a critical regulator of astrogliosis, and resveratrol (RES, a dietary polyphenol) is considered to be a natural inhibitor of STAT3 expression and phosphorylation. In this study, we investigated the effects of RES on STAT3 expression and phosphorylation, and then on the proliferation and activation of astrocytes, a critical process in reactive astrogliosis, in rat primary cultured astrocytes and an in vitro scratch-wound model. RES downregulated the expression levels of STAT3, P-STAT3 and GFAP (glial fibrillary acidic protein) in cultured astrocytes. The positive index of Ki67 was apparently reduced in cultured astrocytes after RES treatment. Meanwhile, cultured astrocyte proliferation and activation were attenuated by RES. Moreover, in the established in vitro scratch-wound model the increased expression levels of STAT3, P-STAT3 and GFAP induced by scratching injury were also clearly inhibited by RES. In addition, the inhibitory effect of RES on cell proliferation was similar to that of AG490 (a selective inhibitor of STAT3 phosphorylation) and abrogated by Colivelin (a STAT3 activator) stimuli. Taken together, our data suggest that RES is able to inhibit reactive astrocyte proliferation and activation mainly via deactivating STAT3 pathway. So RES may have a therapeutic benefit for the treatment of the injured CNS.

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Acknowledgements

This study was supported by the Natural Science Foundation of Liaoning Province of China (20180550064) and Liaoning Provincial Program for Top Discipline of Basic Medical Sciences.

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  1. Moli Wu and Lihong Wang have contributed equally to this work.

Authors and Affiliations

  1. Department of Cell Biology, Basic Medicine College, Dalian Medical University, Dalian, 116044, Liaoning, China

    Moli Wu, Fengzhi Li, Ruina Hu, Jingxin Ma, Kaili Zhang & Xiaoxin Cheng

  2. Institute of Pathology and Southwest Cancer Center, The Army Military Medical University, Chongqing, 400038, China

    Lihong Wang

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  1. Moli Wu
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Wu, M., Wang, L., Li, F. et al. Resveratrol Downregulates STAT3 Expression and Astrocyte Activation in Primary Astrocyte Cultures of Rat. Neurochem Res 45, 455–464 (2020). https://doi.org/10.1007/s11064-019-02936-9

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