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Neuron. 2008 Aug 14;59(3):450-61. doi: 10.1016/j.neuron.2008.05.015.

Proinflammatory mediators modulate the heat-activated ion channel TRPV1 via the scaffolding protein AKAP79/150.

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Department of Pharmacology, University of Cambridge, Cambridge CB21PD, UK.


The ability of vertebrates to detect and avoid damaging extremes of temperature depends on activation of ion channels belonging to the thermo-TRP family. Injury or inflammation causes the release of inflammatory mediators which lower the threshold for detection of painful levels of heat, a process known as heat hyperalgesia. These inflammatory mediators act by at least three distinct intracellular signaling pathways. Here, we show that modulation of the sensitivity of the heat-activated ion channel TRPV1 by the protein kinases PKA and PKC and by the phosphatase calcineurin depends on the formation of a signaling complex between these enzymes, the scaffolding protein AKAP79/150 and TRPV1. We identify a critical region in the TRPV1 C-terminal which mediates binding of AKAP79/150. If binding is prevented, then sensitization by both bradykinin and PGE(2) is abrogated. AKAP79/150 is therefore a final common element in heat hyperalgesia, on which the effects of multiple proinflammatory mediators converge.

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