Resiniferatoxin
Resiniferatoxin | |
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Identifiers | |
CAS number | 57444-62-9 |
PubChem | 104826 |
ChemSpider | 21106474 |
MeSH | resiniferatoxin |
ChEMBL | CHEMBL448382 |
Jmol-3D images | {{#if:Oc1ccc(cc1OC)CC(=O)OCC=4C[C@]7(O)C(=O)C(\C)=C/C7[C@]52O[C@@]3(O[C@](C[C@H]2C)(C(C)=C)C(O3)C5C=4)Cc6ccccc6|Image 1 |
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Properties | |
Molecular formula | C37H40O9 |
Molar mass | 628.71 g/mol |
Density | 1.35 ± 0.1 g/cm³ |
Solubility in water | insoluble |
(verify) (what is: / ?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | |
Infobox references | |
Heat | Above Peak (SR: 16,000,000,000) |
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Resiniferatoxin (RTX) is a naturally occurring chemical found in resin spurge (Euphorbia resinifera), a cactus-like plant commonly found in Morocco, and in Euphorbia poissonii found in northern Nigeria.[1] It is an ultrapotent analog of capsaicin, the active ingredient in chili pepper.[2]
It activates the vanilloid receptor in a subpopulation of primary afferent sensory neurons involved in nociception (the transmission of physiological pain).[3][4] RTX causes an ion channel in the plasma membrane of sensory neurons — the transient receptor potential vanilloid 1 — to become permeable to cations, most particularly the calcium cation; this evokes a powerful irritant effect followed by desensitization and analgesia.[5][6]
Research has been conducted at the National Institutes of Health[7][8] and the University of Pennsylvania[9] to design a novel class of analgesics from the latex of Euphorbia resinifera.
Total synthesis
A total synthesis of (+)-resiniferatoxin was completed by the Wender group at Stanford University in 1997.[10] As of 2007, this represented the only complete total synthesis of any member of the daphnane family of molecules.[11]
Toxicity
Resiniferatoxin is toxic and can inflict chemical burns. Animal experiments indicate that in humans ingestion of 40g or more may be fatal or cause serious damage to health.[12] Using the Scoville Scale, resiniferatoxin is estimated to have a rating of 16 billion, one thousand times higher than the rating for pure capsaicin.
See also
- Capsaicin
- Discovery and development of TRPV1 antagonists
- Iodoresiniferatoxin
- Transient receptor potential
- Tinyatoxin
References
- ↑ Euphorbia poissonii in BoDD – Botanical Dermatology Database
- ↑
- Christopher S. J. Walpole, et al. (1996). "Similarities and Differences in the Structure-Activity Relationships of Capsaicin and Resiniferatoxin Analogues". J. Med. Chem. 39 (15): 2939–2952. doi:10.1021/jm960139d. PMID 8709128.
- ↑ Szallasi A, Blumberg PM (1989). "Resiniferatoxin, a phorbol-related diterpene, acts as an ultrapotent analog of capsaicin, the irritant constituent in red pepper". Neuroscience 30 (2): 515–520. doi:10.1016/0306-4522(89)90269-8. PMID 2747924.
- ↑ Szallasi A, Blumberg PM (1990). "Resiniferatoxin and its analogs provide novel insights into the pharmacology of the vanilloid (capsaicin) receptor". Life Sci. 47 (16): 1399–1408. doi:10.1016/0024-3205(90)90518-V.
- ↑ Szallasi A, Blumberg PM (1992). "Vanilloid receptor loss in rat sensory ganglia associated with long term desensitization to resiniferatoxin". Neurosci Lett. 140 (1): 51–54. doi:10.1016/0304-3940(92)90679-2. PMID 1407700.
- ↑ Olah Z et al. (2001). "Ligand-induced dynamic membrane changes and cell deletion conferred by vanilloid receptor 1". J. Biol. Chem. 276 (14): 11021–11030. doi:10.1074/jbc.M008392200. PMID 11124944.
- ↑ Neubert JK et al. (2003). "Peripherally induced resiniferatoxin analgesia". Pain 109 (1–2): 219–28. doi:10.1016/S0304-3959(03)00009-5. PMID 12855332.
- ↑ Karai L et al. (2004). "Deletion of vanilloid receptor 1_expressing primary afferent neurons for pain control". J Clin Invest. 113 (9): 1344–1352. doi:10.1172/JCI20449. PMC 398431. PMID 15124026.
- ↑ Brown DC et al. (2005). "Physiologic and antinociceptive effects of intrathecal resiniferatoxin in a canine bone cancer model". Anesthesiology 103 (5): 1052–1059. doi:10.1097/00000542-200511000-00020. PMID 16249680.
- ↑ Wender, P.A.; Jesudason, Cynthia D.; Nakahira, Hiroyuki; Tamura, Norikazu; Tebbe, Anne Louise; Ueno, Yoshihide (1997). "The First Synthesis of a Daphnane Diterpene: The Enantiocontrolled Total Synthesis of (+)-Resiniferatoxin". J. Am. Chem. Soc. 119 (52): 12976–12977. doi:10.1021/ja972279y.
- ↑ http://www.scripps.edu/chem/baran/images/grpmtgpdf/Seiple_Mar_07.pdf
- ↑ Material Safety Data Sheet for resiniferatoxin, 2009