Spatial and temporal relationship between monocyte chemoattractant protein-1 expression and spinal glial activation following peripheral nerve injury

Journal of Neurochemistry
Ji Zhang, Yves De Koninck

Abstract

Peripheral nerve injury can induce spinal microglial/astrocyte activation. Substances released by activated glial cells excite spinal nociceptive neurons. Pharmacological disruption of glial activation or antagonism of substances released by activated glia prevent or reverse pain hypersensitivity. It is not known, however, what causes spinal cord glia to shift from a resting to an activated state. In an attempt to understand the potential role of monocyte chemoattractant protein-1 (MCP-1) in triggering spinal glial activation and its contribution to the development of neuropathic pain, we investigated the effect of peripheral nerve injury on MCP-1 expression in dorsal root ganglia (DRG) and the spinal cord, and established its temporal relationship with activation of spinal microglia and astrocytes. We observed that MCP-1 was induced by chronic constriction of the sciatic nerve in DRG sensory neurons, spinal cord motor neurons and in the superficial dorsal horn, ipsilateral to the injury. Neuronal MCP-1 induction was followed by surrounding microglial activation. After peaking at day 7 after injury, MCP-1 levels began to decline rapidly and had returned to baseline by day 150. In contrast, microglial activation peaked by day 14...Continue Reading

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