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CXCL13/CXCR5 promote chronic postsurgical pain and astrocyte activation in rats by targeting NLRP3.
Neuroreport 2024 March 9
Chronic postsurgical pain (CPSP) with high incidence negatively impacts the quality of life. X-C motif chemokine 13 (CXCL13) has been associated with postsurgery inflammation and exacerbates neuropathic pain in patients with CPSP. This study was aimed to illustrate the relationship between CXCL13 and nod-like receptor protein-3 (NLRP3), which is also involved in CPSP. A CPSP model was constructed by skin/muscle incision and retraction (SMIR) in right medial thigh, and the rats were divided into three groups: Sham, SMIR, and SMIR + anti-CXCL13 (intrathecally injected with anti-CXCL13 antibody). Then, the paw withdrawal threshold (PWT) score of rats was recorded. Primary rat astrocytes were isolated and treated with recombinant protein CXCL13 with or without NLRP3 inhibitor INF39. The expressions of CXCL13, CXCR5, IL-1β, IL-18, GFAP, NLRP3, and Caspase-1 p20 were detected by real-time quantitative reverse transcription PCR, western blot, ELISA, immunocytochemistry, and immunofluorescence analyses. The anti-CXCL13 antibody alleviated SMIR-induced decreased PWT and increased expression of GFAP, CXCL13, CXCR5, NLRP3, and Caspase-1 p20 in spinal cord tissues. The production of IL-1β, IL-18, and expression of CXCL13, CXCR5, GFAP, NLRP3, and Caspase-1 p20 were increased in recombinant protein CXCL13-treated primary rat astrocytes in a dose-dependent manner. Treatment with NLRP3 inhibitor INF39 inhibited the function of recombinant protein CXCL13 in primary rat astrocytes. The CXCL13/CXCR5 signaling could promote neuropathic pain, astrocytes activation, and NLRP3 inflammasome activation in CPSP model rats by targeting NLRP3. NLRP3 may be a potential target for the management of CPSP.
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