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SIRT1 Activation Attenuates Bone Cancer Pain by Inhibiting mGluR1/5.

Cell. Mol. Neurobiol.2019 Nov;39(8):1165-1175. Epub 2019 Jul 03
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摘要


Bone cancer pain (BCP), which is induced by primary or metastatic bone cancer, remains a clinically challenging problem due to the poor understanding of its mechanisms. Sirtuin 1 (SIRT1) plays an important role in various pain models. Intrathecal administration of SRT1720, a SIRT1 activator, attenuates BCP in a rat model. However, the expression and activity of SIRT1 during the development and maintenance of BCP remain unknown. Furthermore, the underlying mechanism of SIRT1 in BCP remains ambiguous. In this study, we detected the time course of SIRT1 expression and activity in the spinal cord of mice with BCP and examined whether SRT1720 alleviated BCP by inhibiting metabotropic glutamatergic receptor (mGluR) 1/5 expression. In addition, we downregulated spinal SIRT1 expression in normal mice through an intrathecal injection of AAV-SIRT1-shRNA and then assessed pain behavior and mGluR1/5 expression. Mice with BCP developed significant mechanical allodynia and spontaneous flinching, accompanied by decreased levels of the SIRT1 protein, mRNA, and activity in the spinal cord. The SRT1720 treatment produced an analgesic effect on tumor-bearing mice and decreased the spinal levels of the mGluR1/5 protein and mRNA. In contrast, the AAV-SIRT1-shRNA treatment induced pain behavior in normal mice and increased the spinal levels of the mGluR1/5 protein and mRNA. The results suggested a critical role for SIRT1 in the development and maintenance of BCP and further indicated that activation of SIRT1 in the spinal cord by SRT1720 functionally reverses BCP in mice by inhibiting mGluR1/5.

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