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Comparative Study
. 2005 Jan;113(1-2):185-90.
doi: 10.1016/j.pain.2004.10.021.

Chronic hyperalgesic priming in the rat involves a novel interaction between cAMP and PKCepsilon second messenger pathways

C A Parada  1 , D B Reichling, J D Levine
Affiliations
Comparative Study

Chronic hyperalgesic priming in the rat involves a novel interaction between cAMP and PKCepsilon second messenger pathways

C A Parada et al. Pain. 2005 Jan.

Erratum in

  • Pain. 2005 May;115(1-2):223

Abstract

Toward the goal of defining new pharmacological targets for the treatment of chronic pain conditions, in previous studies we established a model, termed 'hyperalgesic priming,' in which an acute inflammatory stimulus causes a long-lasting latent susceptibility to hyperalgesia induced by subsequent exposures to the inflammatory mediator, prostaglandin E2 (PGE2). Those investigations suggested the hypothesis that priming induces a novel linkage between the PGE2-activated second messenger cascade and the epsilon isoform of protein kinase C (PKCepsilon). In the present study, comparison of dose-response relations for hyperalgesia produced by PGE2, forskolin, 8-Br-cAMP, or the protein kinase A (PKA) catalytic subunit, in primed versus normal animals, demonstrated that priming-induced enhancement of the PGE2-activated second messenger cascade occurs downstream to adenylate cyclase and upstream to PKA. Therefore, PGE2-induced hyperalgesia in the primed animal is enhanced by the recruitment of a novel cAMP/PKCepsilon signaling pathway in addition to the usual cAMP/PKA pathway. These observations suggest that pharmacological disruption of the novel interaction between cAMP and PKCepsilon might provide a route toward the development of highly specific methods to reverse cellular processes that underlie chronic pain states.

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