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Hepatocyte growth factor (HGF) and its receptor c-Met play pivotal roles in post-traumatic regeneration of the nervous system. However, following peripheral nerve injury, the role and regulation of the HGF/c-Met system is less clear. Therefore, using a sciatic nerve ligation (SNL) model, spatiotemporal changes in HGF and c-Met expression were detected in the dorsal root ganglions (DRGs) and lumbar spinal cords of adult rats. HGF expression following SNL was found to be significantly decreased in ipsilateral L4-L5 DRGs from day 3 to day 14, with the lowest levels of expression detected on days 5 and 7. In contrast, no significant change in HGF expression was detected in the lumbar spinal cords. c-Met expression in ipsilateral L4-L5 DRGs and within the ipsilateral dorsal horn was found to be significantly up-regulated following SNL, particularly from day 5 to day 14, with peak levels of expression detected on days 7 and 14. In contrast, c-Met levels following SNL consistently remained stable in the spinal ventral horn. These findings suggest that the HGF/c-Met system is spatiotemporally regulated by a unique pattern of signaling pathways induced by peripheral nerve injury, and these pathways have a role in promoting the survival of injured neurons, especially adult DRG sensory neurons.

Expression of HGF/c-Met Is Dynamically Regulated in the Dorsal Root Ganglions and Spinal Cord of Adult Rats following Sciatic Nerve Ligation