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Background   Protein kinase C (PKC), nuclear factor-kappa B p65 (NF- κ B p65), and P2X 3  receptor (P2X 3 R) play significant roles in the sensitization and transduction of nociceptive signals, which are considered as potential targets for the treatment of neuropathic pain. However, the mechanisms and relationships among them have not been clearly clarified.Methods   80 rats were randomized and divided into 10 groups ( n  = 8). Sciatic chronic constriction injury (CCI) rats were intrathecally administered with bisindolylmaleimide I (GF109203X), a PKC-selective antagonist once a day, or pyrrolidine dithiocarbamate (PDTC), an NF- κ B inhibitor twice a day. Sham-operated rats were intrathecally administered with saline. Thermal withdrawal latency (TWL) and mechanical withdrawal threshold (MWT) were evaluated in all the groups before CCI operation (baseline) and on the 1st, 3rd, 7th, 10th, and 14th day after CCI operation. Protein levels of p-PKC α , p-NF- κ B p65, and P2X 3 R were analyzed in the CCI ipsilateral L 4–6  dorsal root ganglions (DRGs).Results   Intrathecal injection of GF109203X or PDTC alleviated the TWL and MWT in the following 2 weeks after CCI surgery. The protein levels of p-PKC α , p-NF- κ B p65, and P2X 3 R in the ipsilateral DRGs significantly increased after CCI operation, which could be partly reversed by intrathecal administration of GF109203X or PDTC.Conclusion   The upregulation of p-PKC α , p-NF- κ B p65, and P2X 3 R expression in the DRGs of CCI rats was involved in the occurrence and development of neuropathic pain. Phosphorylated PKC α  and phosphorylated NF- κ B p65 regulated with each other. Phosphorylated NF- κ B p65 and PKC α  have a mutual regulation relationship with P2X 3 R, respectively, while the specific regulatory mechanism needs further research.

Effect of PKC/NF-κB on the Regulation of P2X3 Receptor in Dorsal Root Ganglion in Rats with Sciatic Nerve Injury

Effect of PKC/NF-κB on the Regulation of P2X₃ Receptor in Dorsal Root Ganglion in Rats with Sciatic Nerve Injury