The TRPV3 channel belongs to the transient receptor potential channel (TRP) super-family that consists of 7 subfamilies. The channels exist as tetramers where each subunit consists of 6 putative trans-membrane domains. In this respect they have a similar topology to many other voltage-gated channels. The vast majority are permeable to both monovalent cations and calcium (Clapham et al., 2001).
The hTRPV3 channel was first cloned in 2002 by two groups (Xu et al., 2002, Smith et al., 2002) based on its homology to known TRPV channels. It shares 40-50% homology to TRPV1 (Levine and Alessandri-Haber, 2007) and is activated at temperatures ≥ 34°C as well as by 2-Aminoethoxydiphenyl borate (2-APB, Hu et al., 2004) and monoterpenes such as camphor (Vogt-Eisele et al., 2007). In humans it is expressed in skin keratinocytes, trigeminal ganglia, spinal cord and brain (Xu et al., 2002). It is also located in DRG neurons (Xu et al., 2002, Smith et al., 2002, Facer et al., 2007) where it may even form heteromultimers with TRPV1 (Smith et al., 2002). The specific distribution of this channel, coupled with its thermal sensitivity and potential activation by a variety of inflammatory mediators, have suggested that it may represent a novel drug target for the treatment of inflammatory pain.