TRPV1

Last updated
TRPV1
Trpv1 pip2 bilayer.png
Identifiers
Aliases TRPV1 , VR1, transient receptor potential cation channel subfamily V member 1
External IDs OMIM: 602076 MGI: 1341787 HomoloGene: 12920 GeneCards: TRPV1
Orthologs
SpeciesHumanMouse
Entrez

7442

193034

Ensembl

ENSG00000196689

ENSMUSG00000005952

UniProt

Q8NER1

Q704Y3

RefSeq (mRNA)

NM_018727
NM_080704
NM_080705
NM_080706

NM_001001445

RefSeq (protein)

NP_061197
NP_542435
NP_542436
NP_542437

NP_001001445

Location (UCSC) Chr 17: 3.57 – 3.61 Mb Chr 11: 73.13 – 73.15 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

The transient receptor potential cation channel subfamily V member 1 (TRPV1), also known as the capsaicin receptor and the vanilloid receptor 1, is a protein that, in humans, is encoded by the TRPV1 gene. It was the first isolated member of the transient receptor potential vanilloid receptor proteins that in turn are a sub-family of the transient receptor potential protein group. [5] [6] This protein is a member of the TRPV group of transient receptor potential family of ion channels. [7] Fatty acid metabolites with affinity for this receptor are produced by cyanobacteria, which diverged from eukaryotes at least 2000 million years ago (MYA). [8] The function of TRPV1 is detection and regulation of body temperature. In addition, TRPV1 provides a sensation of scalding heat and pain (nociception). In primary afferent sensory neurons, it cooperates with TRPA1 [9] [10] (a chemical irritant receptor) to mediate the detection of noxious environmental stimuli. [11]

Contents

Function

TRPV1 is an element of or mechanism used by the mammalian somatosensory system. [12] It is a nonselective cation channel that may be activated by a wide variety of exogenous and endogenous physical and chemical stimuli. The best-known activators of TRPV1 are: temperature greater than 43 °C (109 °F); acidic conditions; capsaicin (the irritating compound in hot chili peppers); and allyl isothiocyanate, the pungent compound in mustard and wasabi. [13] The activation of TRPV1 leads to a painful, burning sensation. Its endogenous activators include: low pH (acidic conditions), the endocannabinoid anandamide, N-oleyl-dopamine, and N-arachidonoyl-dopamine. TRPV1 receptors are found mainly in the nociceptive neurons of the peripheral nervous system, but they have also been described in many other tissues, including the central nervous system. TRPV1 is involved in the transmission and modulation of pain (nociception), as well as the integration of diverse painful stimuli. [14] [15]

Sensitization

The sensitivity of TRPV1 to noxious stimuli, such as high temperatures, is not static. Upon tissue damage and the consequent inflammation, a number of inflammatory mediators, such as various prostaglandins and bradykinin, are released. These agents increase the sensitivity of nociceptors to noxious stimuli. This manifests as an increased sensitivity to painful stimuli (hyperalgesia) or pain sensation in response to non-painful stimuli (allodynia). Most sensitizing pro-inflammatory agents activate the phospholipase C pathway. Phosphorylation of TRPV1 by protein kinase C has been shown to play a role in sensitization of TRPV1. The cleavage of PIP2 by PLC-beta can result in disinhibition of TRPV1 and, as a consequence, contribute to the sensitivity of TRPV1 to noxious stimuli.

Desensitization

Upon prolonged exposure to capsaicin, TRPV1 activity decreases, a phenomenon called desensitization. Extracellular calcium ions are required for this phenomenon, thus influx of calcium and the consequential increase of intracellular calcium mediate this effect. [16] Various signaling pathways such as phosphorylation by PKA and PKC, interaction with calmodulin, dephosphorylation by calcineurin, [17] and the decrease of PIP2, have been implicated in the regulation of desensitization of TRPV1. Desensitization of TRPV1 is thought to underlie the paradoxical analgesic effect of capsaicin.

Clinical significance

Peripheral nervous system

As a result of its involvement in nociception, TRPV1 has been a target for the development of pain reducers (analgesics). Three major strategies have been used:

TRPV1 use

The TRPV1 receptor is useful to be able to measure how an organism can sense temperature change. In the lab the receptor may be removed from mice giving them the inability to detect differences in ambient temperature. In the pharmaceutical field this allows for the blocking of heat receptors giving patients with inflammatory disorders or severe burning pains a chance to heal without the pain. The lack of the TRPV1 receptor gives a glimpse into the developing brain as heat can kill most organisms in large enough doses, so this removal process shows researchers how the inability to sense heat may be detrimental to the survivability of an organism and then translate this to human heat disorders.[ citation needed ]

TRPV1 in immune cells

TRPV1 plays an important role not only in neurones but also in immune cells. Activation of TRPV1 modulates immune response including the release of inflammatory cytokines, chemokines, and the ability to phagocytose. However, the role of TRPV1 in immune cells is not entirely understood and it is currently intensely studied. TRPV1 is not the only TRP channel expressed in immune cells. TRPA1, TRPM8 and TRPV4 are the most relevant TRP channels that are also studied in immune cells. [18]

The expression of TRPV1 was confirmed in the cells of innate immunity as well as the cells of adaptive immunity. TRPV1 can be found in monocytes, macrophages, dendritic cells, T lymphocytes, natural killer cells and neutrophiles. [19] TRPV1 is said to be potentially very important in immune cell functioning as it senses higher temperature and lower pH, which can affect the immune cell performance. [20]

TRPV1 and adaptive immunity

TRPV1 is an important membrane channel in T cells as it regulates the influx of calcium cations. TRPV1's involvement is mainly in T cell receptor signalling (TCR) signalling, T cell activation and TCR-mediated influx of calcium ions, [19] but it is involved in T cell cytokine production as well. [20] Indeed, T cells with TRPV1 knockout show impaired calcium uptake after T cell activation via TCR, thus they show dysregulation in signalling pathways such as NF-κB and NFAT. [18]

TRPV1 and innate immunity

Regarding innate immunity, activation of TRPV1 by capsaicin has been shown to suppress the production of nitrite radical, superoxide anion and hydrogen peroxide by macrophages. Furthermore, administration of capsaicin, and subsequent activation of TRPV1, suppresses phagocytosis in dendritic cells. In a mouse model, TRPV1 affect dendritic cell maturation and function, however, further studies are needed to clarify this effect in humans. In neutrophils, the increase in cytosolic calcium cations leads to synthesis of prostaglandins. Activation of TRPV1 by capsaicin modulates neutrophil immune response due to the higher influx of calcium ions into the cell. [19]

TRPV1 is also considered a novel therapeutic agent in many inflammatory diseases. Multiple studies have proven that TRPV1 influences the outcome of several inflammatory diseases such as chronic asthma, esophageal inflammation, rheumatoid arthritis and cancer. Studies using TRPV1's agonists and antagonists have shown that their administration indeed changes the course of inflammation. However, at this point, there is a lot of contradictive evidence about what type of response, pro-inflammatory or anti-inflammatory, TRPV1's activation induces. Further research needs to be carried out. Meanwhile, it is important to highlight that TRPV1's influence on inflammatory diseases is probably not limited to only immune cells as it is rather an interplay between immune cells, neurons, and other cell types (epithelial cells etc.). [20]

TRPV1 and cancer

TRPV1 was found to be overexpressed in several types of cancers, e.g., pancreatic cancer and colon adenocarcinoma. This suggest that certain types of cancers might be more prone to cell death mediated by capsaicin-induced (and also other vanilloid-induced) cell death. Indeed, studies have shown inversed correlation of consumption of chili-based foods and all-cause mortality along with cancers. This beneficial impact of the consumption of chili-based foods was attributed to capsaicinoid content. [19]

TRPV1 activation caused by its agonist capsaicin was shown to induce G0-G1 cell arrest and apoptosis in leukemic cell lines, adult T-cell leukaemia and multiple myeloma. Capsaicin reduces the expression of anti-apoptotic protein Bcl-2 and it also promotes activation of p53, a tumour-suppressor protein known as a major regulator of cell death. This effect of capsaicin in both cases subsequently leads to above-mentioned apoptosis. [19]

TRPV1 and neuroinflammation

The interplay between neurons and immune cells is a well-known phenomenon. [21] TRPV1 plays its role in neuroinflammation, being expressed both in neurons and in immune cells. Significant importance should be paid to the confirmed expression of TRPV1 in microglia and astrocytes, cells found close to neurons. The neuro-immune axis is the place of production of neuroinflammatory molecules and receptors that interplay between the two systems and ensure a complex response to external stimuli (or to the body's own pathologies). Studying TRPV1's involvement in neuroinflammation has a great therapeutical significance for the future. [22]

Cutaneus neurons expressing TRPV1 and dendritic cells were found to be located close to each other. Activation of TRPV1 channels in neurons is associated with subsequent production of interleukin 23 (IL-23) by dendritic cells and further production of IL-17 by T cells. These interleukins are important for host defence against pathogenic fungi (such as Candida albicans ) and bacteria (such as Staphylococcus aureus ), thus TRPV1's activation can lead to better defence against these pathogens, thanks to the neuro-immune axis. [20]

TRPV1 is said to contribute to autophagy of microglia via its Ca2+-signalling, which leads to mitochondria-induced cell death. The TRPV1 channel also influences microglia-induced inflammation. Migration and chemotaxis of microglia and astrocytes seems to be affected by TRPV1's interaction with the cytoskeleton and Ca2+-signalling. TRPV1 is therefore involved in the neuro-immune axis via its function in microglia as well. [22]

TRPV1 was shown to have protective effect in neurologic disorders such as Huntington's disease, vascular dementia, and Parkinson's disease. However, its precise function needs to be further explored. [22]

Ligands

Antagonists

Antagonists block TRPV1 activity, thus reducing pain. Identified antagonists include the competitive antagonist capsazepine and the non-competitive antagonist ruthenium red. These agents could be useful when applied systemically. [23] Numerous TRPV1 antagonists have been developed by pharmaceutical companies. TRPV1 antagonists have shown efficacy in reducing nociception from inflammatory and neuropathic pain models in rats. [24] This provides evidence that TRPV1 is capsaicin's sole receptor. [25] In humans, drugs acting at TRPV1 receptors could be used to treat neuropathic pain associated with multiple sclerosis, chemotherapy, or amputation, as well as pain associated with the inflammatory response of damaged tissue, such as in osteoarthritis. [26]

These drugs can affect body temperature (hyperthermia) which is a challenge to therapeutic application. For example, a transient temperature gain (~1 °C for a duration of approximately 40 minutes, reverting to baseline by 40 minutes) was measured in rats with the application of TRPV1 antagonist AMG-9810. [27] The role of TRPV1 in the regulation of body temperature has emerged in the last few years. Based on a number of TRPV-selective antagonists' causing a mild increase in body temperature (hyperthermia), it was proposed that TRPV1 is tonically active in vivo and regulates body temperature [27] by telling the body to "cool itself down". Without these signals, the body overheats. Likewise, this explains the propensity of capsaicin (a TRPV1 agonist) to cause sweating (i.e.: a signal to reduce body temperature). In a recent report, it was found that tonically active TRPV1 channels are present in the viscera and keep an ongoing suppressive effect on body temperature. [28] Recently, it was proposed that predominant function of TRPV1 is body temperature maintenance. [29] Experiments have shown that TRPV1 blockade increases body temperature in multiple species, including rodents and humans, suggesting that TRPV1 is involved in body temperature maintenance. [27] In 2008, AMG-517, a highly selective TRPV1 antagonist was dropped out of clinical trials due to the causation of hyperthermia (~38.3 °C mean increase which was most intense on day 1 but was attenuated on days 2–7. [30] Another molecule, SB-705498, was also evaluated in the clinic but its effect on body temperature was not reported. [31] [32] As we increase understanding of modality specific agonism of TRPV1 it seems that next generation therapeutics targeting TRPV1 have the potential to side-step hyperthermia. [33] Moreover, for at least two indications or approaches this may be a secondary issue. Where the therapeutic approach (e.g., in analgesia) is agonist-mediated desensitization then the hyperthermic effects of antagonists may not be relevant. Secondarily in applications such as TRPV1 antagonism for the treatment of severe conditions such as heart failure, then there may be an acceptable trade-off with mild hyperthermia, although no hyperthermia was observed in rodent models of heart failure treated with BCTC, SB-366791 or AMG-9810. [34] [35] Post translational modification of TRPV1 protein by its phosphorylation is critical for its functionality. Reports published from NIH suggest that Cdk5-mediated phosphorylation of TRPV1 is required for its ligand-induced channel opening. [36]

Agonists

TRPV1 is activated by numerous agonists from natural sources. [37] Agonists such as capsaicin and resiniferatoxin activate TRPV1 and, upon prolonged application, cause TRPV1 activity to decrease (desensitization), leading to alleviation of pain via the subsequent decrease in the TRPV1 mediated release of inflammatory molecules following exposures to noxious stimuli. Agonists can be applied locally to the painful area in various forms, generally as a patch or an ointment. Numerous capsaicin-containing creams are available over the counter, containing low concentrations of capsaicin (0.025 - 0.075%). It is debated whether these preparations actually lead to TRPV1 desensitization; it is possible that they act via counter-irritation. Novel preparations containing higher capsaicin concentration (up to 10%) are under clinical trials. [38] Eight percent capsaicin patches have recently become available for clinical use, with supporting evidence demonstrating that a 30-minute treatment can provide up to 3 months analgesia by causing regression of TRPV1-containing neurons in the skin. [39] Currently, these treatments must be re-administered on a regular (albeit infrequent) schedule in order to maintain their analgesic effects.

Cannabinoid ligands

Cannabinoid ligands include: [40]

N-Acyl amides

N-Acyl Amides that activate cannabimimetic receptors include: [40]

Fatty acid metabolites

Certain metabolites of polyunsaturated fatty acids have been shown to stimulate cells in a TRPV1-dependent fashion. The metabolites of linoleic acid, including 13(S)-hydroxy-9Z,11E-octadecadienoic acid (13(S)-HODE), 13(R)-hydroxy-9Z,11E-octadecadienoic acid (13(R)-HODE, 9(S)-hydroxy-10(E),12(Z)-octadecadienoic acid (9(S)-HODE), 9(R)-hydroxy-10(E),12(Z)-octadecadienoic acid (9(R)-HODE), and their respective keto analogs, 13-oxoODE and 9-oxoODE (see 13-HODE and 9-HODE sections on Direct actions), activate peripheral and central mouse pain sensing neurons. Reports disagree on the potencies of these metabolites with, for example, the most potent one, 9(S)-HODE, requiring at least 10 micromoles/liter. [49] or a more physiological concentration of 10 nanomoles/liter [50] to activate TRPV1 in rodent neurons. The TRPV1-dependency of these metabolites' activities appears to reflect their direct interaction with TPRV1. Although relatively weak agonists of TRPV1 in comparison to anandamide, [49] these linoleate metabolites have been proposed to act through TRPV1 in mediating pain perception in rodents [50] [51] [52] and to cause injury to airway epithelial cells and thereby to contribute to asthma disease [53] in mice and therefore possibly humans. Certain arachidonic acid metabolites, including 20-hydroxy-5Z,8Z,11Z,14Z-eicosatetraenoic acid (see 20-Hydroxyeicosatetraenoic acid) [54] and 12(S)-hydroperoxy-5Z,8Z,10E,12S,14Z-eicosatetraenoic acid (12(S)-HpETE), 12(S)-hydroxy-5Z,8Z,10E,12S,14Z-eicosatetraenoic acid (12(S)-HETE (see 12-HETE), hepoxilin A3 (i.e. 8R/S-hydroxy-11,12-oxido-5Z,9E,14Z-eicosatrienoic acid) and HxB3 (i.e. 10R/S-hydroxy-11,12-oxido-5Z,8Z,14Z-eicosatrienoic acid) likewise activate TRPV1 and may thereby contribute to tactile hyperalgesia and allodynia (see Hepoxilin § Pain perception). [55] [56] [57]

Studies with mice, guinea pig, and human tissues and in guinea pigs indicate that another arachidonic acid metabolite, Prostaglandin E2, operates through its prostaglandin EP3 G protein coupled receptor to trigger cough responses. Its mechanism of action involves activation and/or sensitization of TRPV1 (as well as TRPA1) receptors, presumably by an indirect mechanism. Genetic polymorphism in the EP3 receptor (rs11209716 [58] ), has been associated with ACE inhibitor-induced cough in humans. [59] [60]

Resolvin E1 (RvE1), RvD2 (see resolvins), neuroprotectin D1 (NPD1), and maresin 1 (Mar1) are metabolites of the omega 3 fatty acids, eicosapentaenoic acid (for RvE1) or docosahexaenoic acid (for RvD2, NPD1, and Mar1). These metabolites are members of the specialized proresolving mediators (SPMs) class of metabolites that function to resolve diverse inflammatory reactions and diseases in animal models and, it is proposed, humans. These SPMs also dampen pain perception arising from various inflammation-based causes in animal models. The mechanism behind their pain-dampening effects involves the inhibition of TRPV1, probably (in at least certain cases) by an indirect effect wherein they activate other receptors located on the neurons or nearby microglia or astrocytes. CMKLR1, GPR32, FPR2, and NMDA receptors have been proposed to be the receptors through which these SPMs operate to down-regulate TRPV1 and thereby pain perception. [61] [62] [63] [64] [65]

Fatty acid conjugates

N-Arachidonoyl dopamine, an endocannabinoid found in the human CNS, structurally similar to capsaicin, activates the TRPV1 channel with an EC50 of approximately of 50 nM. [15]

N-Oleyl-dopamine, another endogenous agonist, binds to human VR1 with an Ki of 36 Nm. [66]

Another endocannabinoid anandamide has also been shown to act on TRPV1 receptors. [67]

AM404—an active metabolite of paracetamol (also known as acetaminophen)—that serves as an anandamide reuptake inhibitor and COX inhibitor also serves as a potent TRPV1 agonist. [68]

The plant-biosynthesized cannabinoid cannabidiol also shows "either direct or indirect activation" of TRPV1 receptors. [69] [42] TRPV1 colocalizes with CB1 receptors and CB2 receptors in sensory and brain neurons respectively, and other plant-cannabinoids like CBN, CBG, CBC, THCV, and CBDV are also agonists of this ion channel. [70] [69] There is also evidence that non cannabinoid components of the Cannabis secondary metabolome such as myrcene activate TRPV1. [71]

Vitamin D metabolites

The vitamin D metabolites calcifediol (25-hydroxy vitamin D or 25OHD) and calcitriol (1,25-hydroxy vitamin D or 1,25OHD) act as endogenous ligands of TRPV1. [72]

Central nervous system

TRPV1 is also expressed at high levels in the central nervous system and has been proposed as a target for treatment not only of pain but also for other conditions such as anxiety. [73] Furthermore, TRPV1 appears to mediate long-term synaptic depression (LTD) in the hippocampus. [74] LTD has been linked to a decrease in the ability to make new memories, unlike its opposite long-term potentiation (LTP), which aids in memory formation. A dynamic pattern of LTD and LTP occurring at many synapses provides a code for memory formation. Long-term depression and subsequent pruning of synapses with reduced activity is an important aspect of memory formation. In rat brain slices, activation of TRPV1 with heat or capsaicin induced LTD while capsazepine blocked capsaicin's ability to induce LTD. [74] In the brainstem (solitary tract nucleus), TRPV1 controls the asynchronous and spontaneous release of glutamate from unmyelinated cranial visceral afferents - release processes that are active at normal temperatures and hence quite distinct from TRPV1 responses in painful heat. [75] Hence, there may be therapeutic potential in modulating TRPV1 in the central nervous system, perhaps as a treatment for epilepsy (TRPV1 is already a target in the peripheral nervous system for pain relief).

Interactions

TRPV1 has been shown to interact with:

Discovery

The dorsal root ganglion (DRG) neurons of mammals were known to express a heat-sensitive ion channel that could be activated by capsaicin. [79] The research group of David Julius, therefore, created a cDNA library of genes expressed in dorsal root ganglion neurons, expressed the clones in HEK 293 cells, and looked for cells that respond to capsaicin with calcium influx (which HEK-293 normally do not). After several rounds of screening and dividing the library, a single clone encoding the TRPV1 channel was finally identified in 1997. [5] It was the first TRPV channel to be identified. Julius was awarded the 2021 Nobel prize in Physiology or Medicine for his discovery.

See also

Related Research Articles

<span class="mw-page-title-main">Anandamide</span> Chemical compound (fatty acid neurotransmitter)

Anandamide (ANA), also known as N-arachidonoylethanolamine (AEA), an N-acylethanolamine (NAE), is a fatty acid neurotransmitter. Anandamide was the first endocannabinoid to be discovered: it participates in the body's endocannabinoid system by binding to cannabinoid receptors, the same receptors that the psychoactive compound THC in cannabis acts on. Anandamide is found in nearly all tissues in a wide range of animals. Anandamide has also been found in plants, including small amounts in chocolate. The name 'anandamide' is taken from the Sanskrit word ananda, which means "joy, bliss, delight", plus amide.

Transient receptor potential channels are a group of ion channels located mostly on the plasma membrane of numerous animal cell types. Most of these are grouped into two broad groups: Group 1 includes TRPC, TRPV, TRPVL, TRPM, TRPS, TRPN, and TRPA. Group 2 consists of TRPP and TRPML. Other less-well categorized TRP channels exist, including yeast channels and a number of Group 1 and Group 2 channels present in non-animals. Many of these channels mediate a variety of sensations such as pain, temperature, different kinds of taste, pressure, and vision. In the body, some TRP channels are thought to behave like microscopic thermometers and used in animals to sense hot or cold. Some TRP channels are activated by molecules found in spices like garlic (allicin), chili pepper (capsaicin), wasabi ; others are activated by menthol, camphor, peppermint, and cooling agents; yet others are activated by molecules found in cannabis or stevia. Some act as sensors of osmotic pressure, volume, stretch, and vibration. Most of the channels are activated or inhibited by signaling lipids and contribute to a family of lipid-gated ion channels.

<span class="mw-page-title-main">Resiniferatoxin</span> Chemical compound

Resiniferatoxin (RTX) is a naturally occurring chemical found in resin spurge, a cactus-like plant commonly found in Morocco, and in Euphorbia poissonii found in northern Nigeria. It is a potent functional analog of capsaicin, the active ingredient in chili peppers.

<span class="mw-page-title-main">TRPV</span> Subgroup of TRP cation channels named after the vanilloid receptor

TRPV is a family of transient receptor potential cation channels in animals. All TRPVs are highly calcium selective.

<span class="mw-page-title-main">Capsazepine</span> Chemical compound

Capsazepine is a synthetic antagonist of capsaicin. It is used as a biochemical tool in the study of TRPV ion channels.

<span class="mw-page-title-main">AM404</span> Active metabolite of paracetamol

AM404, also known as N-arachidonoylphenolamine, is an active metabolite of paracetamol (acetaminophen), responsible for all or part of its analgesic action and anticonvulsant effects. Chemically, it is the amide formed from 4-aminophenol and arachidonic acid.

<span class="mw-page-title-main">TRPA1</span> Protein and coding gene in humans

Transient receptor potential cation channel, subfamily A, member 1, also known as transient receptor potential ankyrin 1, TRPA1, or The Wasabi Receptor, is a protein that in humans is encoded by the TRPA1 gene.

<span class="mw-page-title-main">TRPV2</span> Protein-coding gene in the species Homo sapiens

Transient receptor potential cation channel subfamily V member 2 is a protein that in humans is encoded by the TRPV2 gene. TRPV2 is a nonspecific cation channel that is a part of the TRP channel family. This channel allows the cell to communicate with its extracellular environment through the transfer of ions, and responds to noxious temperatures greater than 52 °C. It has a structure similar to that of potassium channels, and has similar functions throughout multiple species; recent research has also shown multiple interactions in the human body.

<span class="mw-page-title-main">TRPV4</span> Protein-coding gene in humans

Transient receptor potential cation channel subfamily V member 4 is an ion channel protein that in humans is encoded by the TRPV4 gene.

<span class="mw-page-title-main">TRPM8</span> Protein-coding gene in the species Homo sapiens

Transient receptor potential cation channel subfamily M (melastatin) member 8 (TRPM8), also known as the cold and menthol receptor 1 (CMR1), is a protein that in humans is encoded by the TRPM8 gene. The TRPM8 channel is the primary molecular transducer of cold somatosensation in humans. In addition, mints can desensitize a region through the activation of TRPM8 receptors.

<span class="mw-page-title-main">TRPV3</span> Protein-coding gene in the species Homo sapiens

Transient receptor potential cation channel, subfamily V, member 3, also known as TRPV3, is a human gene encoding the protein of the same name.

<i>N</i>-Arachidonoyl dopamine Chemical compound

N-Arachidonoyl dopamine (NADA) is an endocannabinoid that acts as an agonist of the CB1 receptor and the transient receptor potential V1 (TRPV1) ion channel. NADA was first described as a putative endocannabinoid (agonist for the CB1 receptor) in 2000 and was subsequently identified as an endovanilloid (agonist for TRPV1) in 2002. NADA is an endogenous arachidonic acid based lipid found in the brain of rats, with especially high concentrations in the hippocampus, cerebellum, and striatum. It activates the TRPV1 channel with an EC50 of approximately of 50 nM which makes it the putative endogenous TRPV1 agonist.

<span class="mw-page-title-main">Iodoresiniferatoxin</span> Chemical compound

Iodoresiniferatoxin (I-RTX) is a strong competitive antagonist of the Transient Receptor Potential Vanilloid 1 (TRPV1) receptor. I-RTX is derived from resiniferatoxin (RTX).

Relief from chronic pain remains a recognized unmet medical need. Consequently, the search for new analgesic agents is being intensively studied by the pharmaceutical industry. The TRPV1 receptor is a ligand gated ion channel that has been implicated in mediation of many types of pain and therefore studied most extensively. The first competitive antagonist, capsazepine, was first described in 1990; since then, several TRPV1 antagonists have entered clinical trials as analgesic agents. Should these new chemical entities relieve symptoms of chronic pain, then this class of compounds may offer one of the first novel mechanisms for the treatment of pain in many years.

Zucapsaicin (Civanex) is a medication used to treat osteoarthritis of the knee and other neuropathic pain. Zucapsaicin is a member of phenols and a member of methoxybenzenes. It is a modulator of transient receptor potential cation channel subfamily V member 1 (TRPV-1), also known as the vanilloid or capsaicin receptor 1 that reduces pain, and improves articular functions. It is the cis-isomer of capsaicin. Civamide, manufactured by Winston Pharmaceuticals, is produced in formulations for oral, nasal, and topical use.

<span class="mw-page-title-main">Vanillotoxin</span> Chemical compound

Vanillotoxins are neurotoxins found in the venom of the tarantula Psalmopoeus cambridgei. They act as agonists for the transient receptor potential cation channel subfamily V member 1 (TRPV1), activating the pain sensory system. VaTx1 and 2 also act as antagonists for the Kv2-type voltage-gated potassium channel (Kv2), inducing paralytic behavior in small animals.

<span class="mw-page-title-main">Vanilloid</span> Chemical compounds containing a vanillyl group

The vanilloids are compounds which possess a vanillyl group. They include vanillyl alcohol, vanillin, vanillic acid, acetovanillon, vanillylmandelic acid, homovanillic acid, capsaicin, etc. Isomers are the isovanilloids.

RhTx is a small peptide toxin from Scolopendra subspinipes mutilans, also called the Chinese red-headed centipede. RhTx binds to the outer pore region of the temperature regulated TRPV1 ion channel, preferably in activated state, causing a downwards shift in the activation threshold temperature, which leads to the immediate onset of heat pain.

<span class="mw-page-title-main">SB-705498</span> Chemical compound

SB-705498 is a drug which acts as a potent and selective blocker of the TRPV1 ion channel. It has been evaluated in clinical trials for the treatment of rhinitis and chronic cough.

<span class="mw-page-title-main">Double-knot toxin</span>

Double-knot toxin (DkTx), also known as Tau-theraphotoxin-Hs1a or Tau-TRTX-Hs1a, is a toxin found in the venom of the Chinese Bird spider, a tarantula species primarily living in the Guangxi province of China. This toxin, characterized by its bivalent structure of two Inhibitor Cysteine Knots (ICK), is thought to induce excruciating and long-lasting pain by activating the transient receptor potential vanilloid 1 (TRPV1) channel.

References

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