S-ketamine mitigates paclitaxel-induced pain-related anxiety-like behavior through downregulation of mGluR5 and activation of the BDNF/TrkB signaling pathway. (PubMed, Front Neurol)
Paclitaxel (PTX), a broad-spectrum anti-tumor drug, is extensively employed as a first-line chemotherapy for solid tumors, including lung and breast cancers. Compared with PTX-treated mice, S-ketamine administration resulted in significant improvements across behavioral, molecular, and electrophysiological dimensions: significantly increased mechanical withdrawal thresholds indicated alleviated neuropathic pain; Increased central area distance/total distance ratio in the OFT and prolonged open arm time in the EPM demonstrated reduced anxiety-like behaviors; concomitant decreases in mGluR5 expression and pyramidal neuron firing rates were observed alongside enhanced theta-gamma phase-amplitude coupling, and upregulation of BDNF and TrkB expression in the PrL was detected. S-ketamine mitigates PTX-induced mechanical allodynia and anxiety-like behaviors, an effect that is closely associated with the downregulation of mGluR5 and the concurrent modulation of the BDNF/TrkB signaling pathway in the PrL of the mPFC.