TRPpathies.J Physiol578: 641653. Liman ER (2007). al.(2007) together with a special edition ofBiochemica et Biophysica Actaon the subject edited by Nilius (2007). TRPC family:Members of the TRPC subfamily (examined by EDM1 Freichelet al., 2005; Pedersenet al., 2005; Putney, 2005; Ambudkar and Ong, 2007; Abramowitz and Birnbaumer, 2009; Beechet al., 2009; Birnbaumer, 2009; Kiselyov and Patterson, 2009), on the basis of sequence homology and similarities in function, fall into four subfamilies: TRPC1, TRPC2, TRPC3/6/7 and TRPC4/5. TRPC2 (not tabulated) is usually a pseudogene in man. All TRPC channels have been proposed to act as store-operated channels, activated by depletion of intracellular calcium stores (examined by Pedersenet al., 2005; Ambudkar and Ong, 2007; Potier and Trebak, 2008; Salidoet al., 2009; Yuanet al., 2009), but this is highly controversial. However, there is conflicting evidence that TRPC1, TRPC4/5 and TRPC3/6/7 can function as receptor-operated channels that are mostly insensitive to store depletion (examined by Herb and Schaefer, 2003; Trebaket al., 2007). A comprehensive listing of G protein-coupled receptors that activate TRPC channels is given in Abramowitz and Birnbaumer (2009). In addition to the specific agents outlined in the table several members of the TRPC family are modulated by lipid factors such as arachidonic acid and its metabolites, sphingosine-1-phosphate, cholesterol and gangliosides (examined by Beechet al., 2009). Hetero-oligomeric complexes of TRPC channels and their association with proteins to form signalling complexes are detailed in Ambudkar and Ong (2007) and Kiselyovet al.(2007b). TRPM family:Members of the TRPM subfamily (examined by Fleig and Penner, 2004; Harteneck, 2005; Pedersenet al., 2005), on the basis of sequence homology, fall into four groups: TRPM1/3, TRPM2/8, TRPM4/5 and TRPM6/7. TRPM1 may exist as five splice variants and is involved in normal melanocyte pigmentation (Oanceaet al., 2009). TRPM2 functions as a sensor of redox status in cells (examined by Eisfeld and Lckhoff, 2007). TRPM3 (examined by Oberwinkler and Phillipp, 2007) exists as multiple splice variants four of which (mTRPM31, mTRPM32, hTRPM3a and hTRPM31325) have been characterized and found to differ significantly in their biophysical properties. A splice variant of TRPM4 (i.e. TRPM4b) and TRPM5 are molecular candidates for endogenous calcium-activated cation channels (Niliuset al., 2003; Liman, 2007; Vennekens and Nilius, 2007). TRPM4 has been shown to be an important regulator of Ca2+access in HDAC-IN-5 to mast cells (Vennekenset al., 2007) and dendritic cell migration (Barbetet al., 2008). TRPM5 in taste receptor cells of the tongue appears essential for the transduction of nice, amino acid and bitter stimuli (Liman, 2007). TRPM6 and 7 combine channel and enzymatic activities (chanzymes) and are involved in Mg2+homeostasis (Schmitzet al., 2003;Voetset al., 2004a; examined by Bodding, 2007; Penner and Fleig, 2007). TRPM8 is usually a channel activated by cooling and pharmacological brokers evoking a cool sensation. TRPM8(/)mice display pronounced deficits in the thermosensation of cold temperatures (Bautistaet al., 2007;Colburnet al., 2007;Dhakaet al., 2007). A truncated TRPM2 isoform (TRPM2-S), generated by option splicing, prevents activation of the full-length protein (TRPM2-L) by H2O2when co-expressed with the latter, which is usually important for apoptosis and HDAC-IN-5 cell death. TRPM4 exists as multiple splice variants: data outlined are for TRPM4b. The sensitivity of TRPM4b and TRPM5 to activation by [Ca2+]idemonstrates a pronounced and time-dependent reduction following excision of inside-out membrane patches (Ullrichet al., 2005). TheVfor activation of TRPM4 and TRPM5 demonstrates a pronounced unfavorable shift with increasing heat. Activation of TRPM8 by depolarization is usually strongly temperature-dependent via a channel-closing rate that decreases with decreasing heat. TheVis shifted in the hyperpolarizing direction both by decreasing heat and by exogenous agonists, such as menthol (Voetset al., 2004b) whereas antagonists produce HDAC-IN-5 depolarizing shifts inV(Mlkiet al., 2007). TheVfor the native channel is far more positive than that of heterologously expressed TRPM8 (Mlkiet al., 2007). It should be noted that menthol and structurally related compounds can elicit release of Ca2+from the endoplasmic reticulum impartial of activation of TRPM8 (Mahieuet al., 2007). Intracellular pH modulates HDAC-IN-5 activation of TRPM8 by chilly and icilin, but not menthol (Anderssonet al., 2004). TRPV family: Members of the TRPV family (examined by Vennekenset al., 2008; Vrienset al., 2009), on the basis of structure and function, comprise four groups: TRPV1/2, TRPV3, TRPV4 and TRPV5/6. TRPV1-4.