ATP Receptors of Microglia Involved in Pain

Kazuhide Inoue

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Microglia, activated when physiological homeostasis is threatened, play an important role as immune cells in the CNS. Activated microglia show a progressive series of changes in morphology, gene expression, function and number, and produce and release various chemical mediators, including proinflammatory cytokines that can produce immunological actions and modify neuronal function. Recently, accumulating evidence has indicated an important role for ATP receptors of activated microglia in neuropathic pain. Neuropathic pain is often a consequence of nerve injury through surgery, bone compression, cancer, diabetes or infection. The expression of the P2X4 receptor, a subtype of ATP receptors, is enhanced in spinal microglia in a peripheral nerve injury model, and blocking pharmacologically and suppressing molecularly P2X4 receptors produces a reduction of the neuropathic pain. Several cytokines such as interleukin 6 (IL6) and tumour necrosis factor α (TNFα) in the dorsal horn are also increased after nerve lesion and have been implicated in contributing to nerve-injury pain. ATP can activate mitogen-activated protein kinase (MAPK) leading to the release of bioactive substances including cytokines from microglia. Thus, diffusible factors released from activated microglia by the stimulation of purinergic receptors may have an important role in the development of neuropathic pain.

Original languageEnglish
Title of host publicationPurinergic Signalling in Neuron-Glia Interactions
PublisherWiley-Blackwell
Pages263-272
Number of pages10
ISBN (Electronic)9780470032244
ISBN (Print)0470018607, 9780470018606
DOIs
Publication statusPublished - Oct 7 2008

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

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