• Plos One · Jan 2014

    The BDNF/TrkB signaling pathway is involved in heat hyperalgesia mediated by Cdk5 in rats.

    • Hong-Hai Zhang, Xiao-Qin Zhang, Qing-Sheng Xue, Yan-Luo Department of Anesthesiology, Ruijin Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, P. R. China., Jin-Lu Huang, Su Zhang, Hai-Jun Shao, Han Lu, Wen-Yuan Wang, and Bu-Wei Yu.
    • Department of Anesthesiology, Ruijin Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, P. R. China ; Department of Anesthesiology, Hang Zhou First People's Hospital, Nan Jing Medical University, Zhejiang, P. R. China.
    • Plos One. 2014 Jan 1; 9 (1): e85536.

    BackgroundCyclin-dependent kinase 5 (Cdk5) has been shown to play an important role in mediating inflammation-induced heat hyperalgesia. However, the underlying mechanism remains unclear. The aim of this study was to determine whether roscovitine, an inhibitor of Cdk5, could reverse the heat hyperalgesia induced by peripheral injection of complete Freund's adjuvant (CFA) via the brain-derived neurotrophic factor (BDNF)-tyrosine kinase B (TrkB) signaling pathway in the dorsal horn of the spinal cord in rats.ResultsHeat hyperalgesia induced by peripheral injection of CFA was significantly reversed by roscovitine, TrkB-IgG, and the TrkB inhibitor K252a, respectively. Furthermore, BDNF was significantly increased from 0.5 h to 24 h after CFA injection in the spinal cord dorsal horn. Intrathecal adminstration of the Cdk5 inhibitor roscovitine had no obvious effects on BDNF levels. Increased TrkB protein level was significantly reversed by roscovitine between 0.5 h and 6 h after CFA injection. Cdk5 and TrkB co-immunoprecipitation results suggested Cdk5 mediates the heat hyperalgesia induced by CFA injection by binding with TrkB, and the binding between Cdk5 and TrkB was markedly blocked by intrathecal adminstration of roscovitine.ConclusionOur data suggested that the BDNF-TrkB signaling pathway was involved in CFA-induced heat hyperalgesia mediated by Cdk5. Roscovitine reversed the heat hyperalgesia induced by peripheral injection of CFA by blocking BDNF/TrkB signaling pathway, suggesting that severing the close crosstalk between Cdk5 and the BDNF/TrkB signaling cascade may present a potential target for anti-inflammatory pain.

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