Abstract
Background: Paclitaxel treatment is a major cause of chemotherapy-induced peripheral neuropathy. The sodium channel Nav1.7 plays a critical role in pain perception. However, whether Nav1.7 in the dorsal root ganglion (DRG) is involved in paclitaxel-induced peripheral neuropathy remains unclear. Thus, our study aimed to evaluate whether Nav1.7 participates in the pathogenesis of paclitaxel-induced neuropathy.
Methods: Paclitaxel-induced peripheral neuropathy was generated by intraperitoneal administration of paclitaxel on four alternate days.
Results: The results showed that DRG mRNA and protein expression levels of Nav1.7 were upregulated between days 7 and 21 after the administration of paclitaxel. Besides, paclitaxel upregulated extracellular signal-regulated kinase (ERK1/2) phosphorylation in DRG. Intrathecal injection of U0126 (a MEK inhibitor) blocking ERK1/2 phosphorylation blunted up-regulation of Nav1.7 in the DRG and correspondingly attenuated hyperalgesia.
Conclusion: These results indicated that the sodium channel Nav1.7 in the DRG exerted an important function in paclitaxel-induced neuropathy, which was associated with ERK phosphorylation in neurons.
Keywords: Extracellular signal-regulated kinase, dorsal root ganglion, hyperalgesia, paclitaxel-induced peripheral neuropathy, neuron, chemotherapeutic drug.
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