Complete Freunds adjuvant-induced peripheral inflammation evokes glial activation and proinflammatory cytokine expression in the CNS

The European Journal of Neuroscience
Vasudeva RaghavendraJoyce A DeLeo

Abstract

Peripheral inflammation induces central sensitization characterized by the development of allodynia and hyperalgesia to mechanical and thermal stimuli. Recent evidence suggests that activation of glial cells and a subsequent increase in proinflammatory cytokines contribute to the development of behavioral hypersensitivity after nerve injury or peripheral inflammation. In the present study, we examined mRNA and protein expression of glial markers and proinflammatory cytokines at the lumbar spinal cord, brainstem and forebrain following intraplantar administration of complete Freunds adjuvant (CFA) in rats. Gene expression studied by real-time reverse transcriptase-polymerase chain reaction (RT-PCR) for microglial markers (Mac-1, TLR4 and CD14) showed a significant increase in their expression during all phases (acute, subacute and chronic) of inflammation. Conversely, up-regulation of astroglial markers [glial fibrillary acidic protein (GFAP) and S100B] was observed only at the subacute and chronic phases of inflammation. Increased immunoreactivity for OX-42 (CR3/CD11b) and GFAP at various brain regions was also observed after the acute and subacute phases of the inflammation, respectively. Quantification of proinflammatory cyto...Continue Reading

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