The TRP superfamily of channels (nomenclature as agreed by NC-IUPHAR [28,212]), whose founder member is the Drosophila Trp channel, exists in mammals as six families; TRPC, TRPM, TRPV, TRPA, TRPP and TRPML based on amino acid homologies. TRP subunits contain six putative transmembrane domains and assemble as homo- or hetero-tetramers to form cation selective channels with diverse modes of activation and varied permeation properties (reviewed by [151]). Established, or potential, physiological functions of the individual members of the TRP families are discussed in detail in the recommended reviews and a compilation edited by Islam [75]. The established, or potential, involvement of TRP channels in disease is reviewed in [87,134] and [136], together with a special edition of Biochemica et Biophysica Acta on the subject [134]. The pharmacology of most TRP channels is poorly developed [212]. Broad spectrum agents are listed in the tables along with more selective, or recently recognised, ligands that are flagged by the inclusion of a primary reference. Most TRP channels are regulated by phosphoinostides such as PtIns(4,5)P₂ and IP₃ although the effects reported are often complex, occasionally contradictory, and likely to be dependent upon experimental conditions, such as intracellular ATP levels (reviewed by [137,168,198]). Such regulation is generally not included in the tables.When thermosensitivity is mentioned, it refers specifically to a high Q10 of gating, often in the range of 10-30, but does not necessarily imply that the channel's function is to act as a 'hot' or 'cold' sensor. In general, the search for TRP activators has led to many claims for temperature sensing, mechanosensation, and lipid sensing. All proteins are of course sensitive to energies of binding, mechanical force, and temperature, but the issue is whether the proposed input is within a physiologically relevant range resulting in a response.

TRPA (ankyrin) family

TRPA1 is the sole mammalian member of this group (reviewed by [47]). TRPA1 activation of sensory neurons contribute to nociception [78,121,180]. Pungent chemicals such as mustard oil (AITC), allicin, and cinnamaldehyde activate TRPA1 by modification of free thiol groups of cysteine side chains, especially those located in its amino terminus [11,66,114,116]. Alkenals with α, β-unsaturated bonds, such as propenal (acrolein), butenal (crotylaldehyde), and 2-pentenal can react with free thiols via Michael addition and can activate TRPA1. However, potency appears to weaken as carbon chain length increases [5,11]. Covalent modification leads to sustained activation of TRPA1. Chemicals including carvacrol, menthol, and local anesthetics reversibly activate TRPA1 by non-covalent binding [81,99,215-216]. TRPA1 is not mechanosensitive under physiological conditions, but can be activated by cold temperatures [34,82]. The electron cryo-EM structure of TRPA1 [155] indicates that it is a 6-TM homotetramer. Each subunit of the channel contains two short ‘pore helices’ pointing into the ion selectivity filter, which is big enough to allow permeation of partially hydrated Ca²⁺ ions. A coiled-coil domain in the carboxy-terminal region forms the cytoplasmic stalk of the channel, and is surrounded by 16 ankyrin repeat domains, which are speculated to interdigitate with an overlying helix-turn-helix and putative β-sheet domain containing cysteine residues targeted by electrophilic TRPA1 agonists. The TRP domain, a helix at the base of S6, runs perpendicular to the pore helices suspended above the ankyrin repeats below, where it may contribute to regulation of the lower pore. The coiled-coil stalk mediates bundling of the four subunits through interactions between predicted α-helices at the base of the channel.

TRPC (canonical) family

Members of the TRPC subfamily (reviewed by [1-2,15,18,46,85,154,164]) fall into the subgroups outlined below. TRPC2 is a pseudogene in humans. It is generally accepted that all TRPC channels are activated downstream of G_q/11-coupled receptors, or receptor tyrosine kinases (reviewed by [161,190,212]). A comprehensive listing of G-protein coupled receptors that activate TRPC channels is given in [1]. Hetero-oligomeric complexes of TRPC channels and their association with proteins to form signalling complexes are detailed in [2] and [86]. TRPC channels have frequently been proposed to act as store-operated channels (SOCs) (or compenents of mulimeric complexes that form SOCs), activated by depletion of intracellular calcium stores (reviewed by [2,25,156,162,170,224]). However, the weight of the evidence is that they are not directly gated by conventional store-operated mechanisms, as established for Stim-gated Orai channels. TRPC channels are not mechanically gated in physiologically relevant ranges of force. All members of the TRPC family are blocked by 2-APB and SKF96365 [61-62]. Activation of TRPC channels by lipids is discussed by [15].

TRPC1/C4/C5 subgroup
TRPC4/C5 may be distinguished from other TRP channels by their potentiation by micromolar concentrations of La³⁺. TRPC2 is a pseudogene in humans, but in other mammals appears to be an ion channel localized to microvilli of the vomeronasal organ. It is required for normal sexual behavior in response to pheromones in mice. It may also function in the main olfactory epithelia in mice [107,149-150,221-223,229].

TRPC3/C6/C7 subgroup
All members are activated by diacylglycerol independent of protein kinase C stimulation [62].

TRPM (melastatin) family

Members of the TRPM subfamily (reviewed by [44,61,156,226]) fall into the five subgroups outlined below.

TRPM1/M3 subgroup
In darkness, glutamate released by the photoreceptors and ON-bipolar cells binds to the metabotropic glutamate receptor 6 , leading to activation of Go . This results in the closure of TRPM1. When the photoreceptors are stimulated by light, glutamate release is reduced, and TRPM1 channels are more active, resulting in cell membrane depolarization. Human TRPM1 mutations are associated with congenital stationary night blindness (CSNB), whose patients lack rod function. TRPM1 is also found melanocytes. Isoforms of TRPM1 may present in melanocytes, melanoma, brain, and retina. In melanoma cells, TRPM1 is prevalent in highly dynamic intracellular vesicular structures [74,144].TRPM3 (reviewed by [147]) exists as multiple splice variants four of which (mTRPM3α1, mTRPM3α2, hTRPM3a and hTRPM3₁₃₂₅) have been characterised and found to differ significantly in their biophysical properties. TRPM3 is expressed in somatosensory neurons and may be important in development of heat hyperalgesia during inflammation. TRPM3 is frequently coexpressed with TRPA1 and TRPV1 in these neurons. TRPM3 is expressed in pancreatic beta cells as well as brain, pituitary gland, eye, kidney, and adipose tissue [146,186]. TRPM3 may contribute to the detection of noxious heat [202].

TRPM2
TRPM2 is activated under conditions of oxidative stress (respiratory burst of phagocytic cells) and ischemic conditions. However, the direct activators are ADPR(P) and calcium. As for many ion channels, PIP₂ must also be present (reviewed by [220]). Numerous splice variants of TRPM2 exist which differ in their activation mechanisms [40]. The C-terminal domain contains a TRP motif, a coiled-coil region, and an enzymatic NUDT9 homologous domain. TRPM2 appears not to be activated by NAD, NAAD, or NAADP, but is directly activated by ADPRP (adenosine-5'-O-disphosphoribose phosphate) [192].

TRPM4/5 subgroup
TRPM4 and TRPM5 have the distinction within all TRP channels of being impermeable to Ca²⁺ [212]. A splice variant of TRPM4 (i.e.TRPM4b) and TRPM5 are molecular candidates for endogenous calcium-activated cation (CAN) channels [54]. TRPM4 is active in the late phase of repolarization of the cardiac ventricular action potential. TRPM4 enhances beta adrenergic-mediated inotropy. Mutations are associated with conduction defects [76,119,178]. TRPM4 has been shown to be an important regulator of Ca²⁺ entry in to mast cells [194] and dendritic cell migration [10]. TRPM5 in taste receptor cells of the tongue appears essential for the transduction of sweet, amino acid and bitter stimuli [106] TRPM5 contributes to the slow afterdepolarization of layer 5 neurons in mouse prefrontal cortex [100].

TRPM6/7 subgroup
TRPM6 and 7 combine channel and enzymatic activities (‘chanzymes’). These channels have the unusual property of permeation by divalent (Ca²⁺, Mg²⁺, Zn²⁺) and monovalent cations, high single channel conductances, but overall extremely small inward conductance when expressed to the plasma membrane. They are inhibited by internal Mg²⁺ at ~0.6 mM, around the free level of Mg²⁺ in cells. Whether they contribute to Mg²⁺ homeostasis is a contentious issue. When either gene is deleted in mice, the result is embryonic lethality. The C-terminal kinase region is cleaved under unknown stimuli, and the kinase phosphorylates nuclear histones.

TRPM8
Is a channel activated by cooling and pharmacological agents evoking a ‘cool’ sensation and participates in the thermosensation of cold temperatures [13,29,38] reviewed by [90,110,126,199].

TRPML (mucolipin) family

The TRPML family [30,163,165,218,225] consists of three mammalian members (TRPML1-3). TRPML channels are probably restricted to intracellular vesicles and mutations in the gene (MCOLN1) encoding TRPML1 (mucolipin-1) are one cause of the neurodegenerative disorder mucolipidosis type IV (MLIV) in man. TRPML1 is a cation selective ion channel that is important for sorting/transport of endosomes in the late endocytotic pathway and specifically fusion between late endosome-lysosome hybrid vesicles. TRPML2 and TRPML3 show increased channel activity in low extracellular sodium and are activated by similar small molecules [51]. TRPML3 is important for hair cell maturation, stereocilia maturation and intracellular vesicle transport. A naturally occurring gain of function mutation in TRPML3 (i.e. A419P) results in the varitint waddler (Va) mouse phenotype (reviewed by [138,165]).

TRPP (polycystin) family

The TRPP family (reviewed by [35,37,48,68,210]) or PKD2 family is comprised of PKD2, PKD2L1 and PKD2L2, which have been renamed TRPP1, TRPP2 and TRPP3, respectively [212]. They are clearly distinct from the PKD1 family, whose function is unknown. Although still being sorted out, TRPP family members appear to be 6TM spanning nonselective cation channels.

TRPV (vanilloid) family

Members of the TRPV family (reviewed by [195]) can broadly be divided into the non-selective cation channels, TRPV1-4 and the more calcium selective channels TRPV5 and TRPV6.

TRPV1-V4 subfamily
TRPV1 is involved in the development of thermal hyperalgesia following inflammation and may contribute to the detection of noxius heat (reviewed by [160,179,183]). Numerous splice variants of TRPV1 have been described, some of which modulate the activity of TRPV1, or act in a dominant negative manner when co-expressed with TRPV1 [171]. The pharmacology of TRPV1 channels is discussed in detail in [56] and [201]. TRPV2 is probably not a thermosensor in man [152], but has recently been implicated in innate immunity [108]. TRPV3 and TRPV4 are both thermosensitive. There are claims that TRPV4 is also mechanosensitive, but this has not been established to be within a physiological range in a native environment [22,104].

TRPV5/V6 subfamily
Under physiological conditions, TRPV5 and TRPV6 are calcium selective channels involved in the absorption and reabsorption of calcium across intestinal and kidney tubule epithelia (reviewed by [32,43,127,209]).

TRPA (ankyrin) family

Agents activating TRPA1 in a covalent manner are thiol reactive electrophiles that bind to cysteine and lysine residues within the cytoplasmic domain of the channel [66,113]. TRPA1 is activated by a wide range of endogenous and exogenous compounds and only a few representative examples are mentioned in the table: an exhaustive listing can be found in [9]. In addition, TRPA1 is potently activated by intracellular zinc (EC₅₀ = 8 nM) [4,70].

TRPM (melastatin) family

Ca²⁺ activates all splice variants of TRPM2, but other activators listed are effective only at the full length isoform [40]. Inhibition of TRPM2 by clotrimazole, miconazole, econazole, flufenamic acid is largely irreversible. TRPM4 exists as multiple spice variants: data listed are for TRPM4b. The sensitivity of TRPM4b and TRPM5 to activation by [Ca²⁺]_i demonstrates a pronounced and time-dependent reduction following excision of inside-out membrane patches [193]. The V_½ for activation of TRPM4 and TRPM5 demonstrates a pronounced negative shift with increasing temperature. Activation of TRPM8 by depolarization is strongly temperature-dependent via a channel-closing rate that decreases with decreasing temperature. The V_½ is shifted in the hyperpolarizing direction both by decreasing temperature and by exogenous agonists, such as (-)-menthol [197] whereas antagonists produce depolarizing shifts in V_½ [125]. The V_½ for the native channel is far more positive than that of heterologously expressed TRPM8 [125]. It should be noted that (-)-menthol and structurally related compounds can elicit release of Ca²⁺ from the endoplasmic reticulum independent of activation of TRPM8 [117]. Intracellular pH modulates activation of TRPM8 by cold and icilin, but not (-)-menthol [3].

TRPML (mucolipin) family

Data in the table are for TRPML proteins mutated (i.e TRPML1^Va, TRPML2^Va and TRPML3^Va) at loci equivalent to TRPML3 A419P to allow plasma membrane expression when expressed in HEK-293 cells and subsequent characterisation by patch-clamp recording [39,50,83,130,217]. Data for wild type TRPML3 are also tabulated [83-84,130,217]. It should be noted that alternative methodologies, particularly in the case of TRPML1, have resulted in channels with differing biophysical characteristics (reviewed by [163]).

TRPP (polycystin) family

Data in the table are extracted from [31,37] and [173]. Broadly similar single channel conductance, mono- and di-valent cation selectivity and sensitivity to blockers are observed for TRPP2 co-expressed with TRPP1 [36]. Ca²⁺, Ba²⁺ and Sr²⁺ permeate TRPP3, but reduce inward currents carried by Na⁺. Mg²⁺ is largely impermeant and exerts a voltage dependent inhibition that increases with hyperpolarization.

TRPV (vanilloid) family

Activation of TRPV1 by depolarisation is strongly temperature-dependent via a channel opening rate that increases with increasing temperature. The V_½ is shifted in the hyperpolarizing direction both by increasing temperature and by exogenous agonists [197]. The sensitivity of TRPV4 to heat, but not 4α-PDD is lost upon patch excision. TRPV4 is activated by anandamide and arachidonic acid following P450 epoxygenase-dependent metabolism to 5,6-epoxyeicosatrienoic acid (reviewed by [142]). Activation of TRPV4 by cell swelling, but not heat, or phorbol esters, is mediated via the formation of epoxyeicosatrieonic acids. Phorbol esters bind directly to TRPV4. TRPV5 preferentially conducts Ca²⁺ under physiological conditions, but in the absence of extracellular Ca²⁺, conducts monovalent cations. Single channel conductances listed for TRPV5 and TRPV6 were determined in divalent cation-free extracellular solution. Ca²⁺-induced inactivation occurs at hyperpolarized potentials when Ca²⁺ is present extracellularly. Single channel events cannot be resolved (probably due to greatly reduced conductance) in the presence of extracellular divalent cations. Measurements of P_Ca/P_Na for TRPV5 and TRPV6 are dependent upon ionic conditions due to anomalous mole fraction behaviour. Blockade of TRPV5 and TRPV6 by extracellular Mg²⁺ is voltage-dependent. Intracellular Mg²⁺ also exerts a voltage dependent block that is alleviated by hyperpolarization and contributes to the time-dependent activation and deactivation of TRPV6 mediated monovalent cation currents. TRPV5 and TRPV6 differ in their kinetics of Ca²⁺-dependent inactivation and recovery from inactivation. TRPV5 and TRPV6 function as homo- and hetero-tetramers.

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Subcommittee members: Haoxing Xu (Chairperson) Department of Molecular, Cellular and Developmental Biology University of Michigan 3089 Natural Science Building (Kraus) 830 North University Avenue Ann Arbor, MI 48109-1048 USA David E. Clapham (Past chairperson) Howard Hughes Medical Institute Department of Cardiology Boston Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston, MA 02115, USA Paul DeCaen Howard Hughes Medical Institute Department of Cardiology Boston Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston, MA 02115, USA

Other contributors: Nathaniel T. Blair Howard Hughes Medical Institute Department of Cardiology Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston, MA 02115 USA Ingrid Carvacho Howard Hughes Medical Institute Department of Cardiology Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston, MA 0211USA Dipayan Chaudhuri Howard Hughes Medical Institute Department of Cardiology Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston, MA 02115 USA Julia F. Doerner Howard Hughes Medical Institute Department of Cardiology Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston, MA 02115 USA Lu Fan Department of Pharmacology Yale School of Medicine New Haven Connecticut 06520 USA Sven E. Jordt Department of Pharmacology Yale School of Medicine New Haven Connecticut, 06520 USA David Julius University of California San Francisco Department of Physiology Genentech Hall Room N-272E 600 16th Street San Francisco CA 94158-2140 USA Kristopher T Kahle Howard Hughes Medical Institute Department of Cardiology Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston, MA 02115 USA Boyi Liu Department of Pharmacology Yale School of Medicine New Haven Connecticut, 06520 USA David McKemy University of Southern California Department of Neurobiology University Park Campus HNB 228 M/C 2520 Los Angeles, CA 90089-2520 USA Bernd Nilius Department of Molecular Cell Biology Katholieke Universiteit Leuven O&N I Herestraat 49 - bus 00802 B-3000 Leuven Belgium Elena Oancea Department of Molecular Pharmacology, Physiology, and Biotechnology Brown University Providence RI USA Grzegorz Owsianik Department of Molecular Cell Biology Katholieke Universiteit Leuven O&N I Herestraat 49 - bus 00802 B-3000 Leuven Belgium Antonio Riccio Howard Hughes Medical Institute Department of Cardiology Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston, MA 02115 USA Rajan Sah University of Iowa Department of Cardiology 200 Hawkins Dr Iowa City IA 52242-1009 USA Stephanie C. Stotz Howard Hughes Medical Institute Department of Cardiology Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston MA, 02115 USA Dan Tong Howard Hughes Medical Institute Department of Cardiology Children's Hospital Department of Neurobiology Harvard Medical School 1309 Enders Research Building 320 Longwood Avenue Boston, MA 02115 USA Long-Jun Wu Department of Cell Biology and Neuroscience Rutgers University 604 Allison Road Piscataway NJ, 08854 USA