D-series resolvins suppressed sensory TRP activities resulting in multiple anti-nociception

37th Congress of IUPS (Birmingham, UK) (2013) Proc 37th IUPS, PCD126

Poster Communications: D-series resolvins suppressed sensory TRP activities resulting in multiple anti-nociception

S. Yoo1,2, S. Bang1,2, T. Yang1,2, J. Lim1,2, S. Hwang1,2

1. Department of Medical Science, Korea University, Ansan, Gyeonggi, Korea, Republic of. 2. Translational Research Institute for Incurable Diseases, Korea University College of Medicine, Ansan, Gyeonggi, Korea, Republic of.

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Sensory transient receptor potential (TRP) ion channels present in DRG nerve termini and skin keratinocytes serve a crucial role in detection of environmental harmful stimuli. Little is known about endogenous molecules that negatively control these TRP activities. Resolvins are anti-inflammatory and pro-resolving lipid molecules naturally generated during inflammatory processes. We asked whether D-series resolvins (RvDs) modulate the sensory TRP channel activation. We examined the effects of 17(S)-RvD1 and 17(R)-RvD1 on sensory TRPs using calcium imaging and whole cell electrophysiology experiments with a HEK cell heterologous expression system, cultured sensory neurons and HaCaT keratinocytes. Changes in agonist-specific acute nociceptive behaviors (licks, flicks and flinches) and TRP-related mechanical and thermal pain behaviors were also checked with or without inflammation. As a result, 17(S)-RvD1 targeted multiple TRP channels while 17(R)-RvD1 specifically acted on TRPV3. 17(S)-RvD1 inhibited TRPA1, TRPV3 and TRPV4 at nanomolar and micromolar levels. Consistent decreases in acute pain indices by local administration of 17(S)-RvD1 were also detected. Peripheral treatment of 17(S)-RvD1 significantly prevented mechanical and thermal hypersensitivity in inflamed tissues. For 17(R)-RvD1, TRPV3-specific in vitro and in vivo responses were suppressed upon its application. The administration of 17(R)-RvD1 reversed thermal hypersensitivity caused by inflammation. A molecular mechanism of such inhibition appears to be a shift in voltage-dependence of TRP channels. In conclusion, RvDs are potent endogenous sensory TRP channel inhibitors. The result implicates that our body has an internal antinociceptive potential with endogenous TRP-regulating lipids. This finding may also help understand pain mechanisms involving TRP interactions with pro-resolving substances.



Where applicable, experiments conform with Society ethical requirements.

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