Thapsigargin

Thapsigargin
Names
IUPAC name
(3S,3aR,4S,6S,6aR,7S,8S,9bS)-6-(Acetyloxy)-4-(butyryloxy)-3,3a-dihydroxy-3,6,9-trimethyl-8-{[(2Z)-2-methylbut-2-enoyl]oxy}-2-oxo-2,3,3a,4,5,6,6a,7,8,9b-decahydroazuleno[4,5-b]furan-7-yl octanoate
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.116.539
Properties
C34H50O12
Molar mass 650.76 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Thapsigargin is non-competitive inhibitor of the sarco/endoplasmic reticulum Ca2+ ATPase (SERCA).[1] Structurally, thapsigargin is classified as a sesquiterpene lactone, and is extracted from a plant, Thapsia garganica. It is a tumor promoter in mammalian cells.[2]

Thapsigargin raises cytosolic (intracellular) calcium concentration by blocking the ability of the cell to pump calcium into the sarcoplasmic and endoplasmic reticula. Store-depletion can secondarily activate plasma membrane calcium channels, allowing an influx of calcium into the cytosol.

Thapsigargin specifically inhibits the fusion of autophagosomes with lysosomes; the last step in the autophagic process. The inhibition of the autophagic process in turn induces stress on the endoplasmic reticulum which ultimately leads to cellular death.[3]

Thapsigargin is useful in experimentation examining the impacts of increasing cytosolic calcium concentrations.

Biosynthesis

The complete biosynthesis of thapsigargin has yet to be elucidated. A proposed biosynthesis starts with the farnesyl pyrophosphate. The first step is controlled by the enzyme germacrene B synthase. In the second step, the C(8) position is easily activated for an allylic oxidation due to the position of the double bond. The next step is the addition of the acyloxy moiety by a P450 acetyltransferase; which is a well known reaction for the synthesis of the diterpene, taxol. In the third step, the lactone ring is formed by a cytochrome P450 enzyme using NADP+. With the butyloxy group on the C(8), the formation will only generate the 6,12-lactone ring. The fourth step is an epoxidation that initiates the last step of the base guaianolide formation. In the fifth step, a P450 enzyme closes the 5 + 7 guaianolide structure. The ring closing is important, because it will proceed via 1,10 - epoxidation in order to retain the 4,5 - double bond needed in thapsigargin. It is not known whether the secondary modifications to the guaianolide occur before, or after the formation of thapsigargin, but will need to be considered when elucidating the true biosynthesis. It should also be noted, that several of these enzymes are P450s, therefore oxygen and NADPH are likely crucial to this biosynthesis as well as other cofactors such as Mg2+ and Mn2+ may be needed.[4]

Research

Since inhibition of SERCA is a mechanism of action that has been used to target solid tumors, thapsigargin has attracted research interest. A prodrug of thapsigargin, mipsagargin, is currently undergoing clinical trials for the treatment of glioblastoma.[5][6][7][8]

The biological activity has also attracted research into the laboratory synthesis of thapsigargin. To date, three distinct syntheses have been reported: one by Steven V. Ley,[9] one by Phil Baran.,[10] and one by P. Andrew Evans.[11]

See also

References

  1. ↑ Rogers TB, Inesi G, Wade R, Lederer WJ (1995). "Use of thapsigargin to study Ca2+ homeostasis in cardiac cells". Biosci. Rep. 15 (5): 341–9. PMID 8825036. doi:10.1007/BF01788366.
  2. ↑ Hakii, H.; Fujiki, H.; Suganuma, M.; Nakayasu, M.; Tahira, T.; Sugimura, T.; Scheuer, P. J.; Christensen, S. B. (1986). "Thapsigargin, a histamine secretagogue, is a non-12-O-tetradecanolphorbol-13-acetate (TPA) type tumor promoter in two-stage mouse skin carcinogenesis". Journal of Cancer Research and Clinical Oncology. 111 (3): 177–181. doi:10.1007/BF00389230.
  3. ↑ Ganley, Ian G.; Wong, Pui-Mun; Gammoh, Noor; Jiang, Xuejun "Distinct Autophagosomal-Lysosomal Fusion Mechanism Revealed by Thapsigargin-Induced Autophagy Arrest" Molecular cell doi:10.1016/j.molcel.2011.04.024 (volume 42 issue 6 pp.731 - 743)
  4. ↑ Drew, D.P.; Krichau, N.; Reichwald, K.; Simonsen, H.T. (2009). "Guaianolides in apiaceae: perspectives on pharmacology and biosynthesis". Phytochem Rev. 8 (3): 581–599. doi:10.1007/s11101-009-9130-z.
  5. ↑ Denmeade, S. R.; Mhaka, A. M.; Rosen, D. M.; Brennen, W. N.; Dalrymple, S; Dach, I; Olesen, C; Gurel, B; Demarzo, A. M.; Wilding, G; Carducci, M. A.; Dionne, C. A.; Møller, J. V.; Nissen, P; Christensen, S. B.; Isaacs, J. T. (2012). "Engineering a Prostate-Specific Membrane Antigen–Activated Tumor Endothelial Cell Prodrug for Cancer Therapy". Science Translational Medicine. 4 (140): 140ra86. PMC 3715055 Freely accessible. PMID 22745436. doi:10.1126/scitranslmed.3003886.
  6. ↑ Andersen, Trine; López, Carmen; Manczak, Tom; Martinez, Karen; Simonsen, Henrik (2015). "Thapsigargin—From Thapsia L. To Mipsagargin". Molecules. 20 (4): 6113. PMID 25856061. doi:10.3390/molecules20046113.
  7. ↑ "Mipsagargin". NCI Drug Dictionary. National Cancer Institute.
  8. ↑ "Clinical Trials: Mipsagargin". National Cancer Institute.
  9. ↑ Ball, Matthew; Andrews, Stephen P.; Wierschem, Frank; Cleator, Ed; Smith, Martin D.; Ley, Steven V. (2007). "Total Synthesis of Thapsigargin, a Potent SERCA Pump Inhibitor". Organic Letters. 9 (4): 663. PMID 17256950. doi:10.1021/ol062947x.
  10. ↑ Chu, Hang; Smith, Joel M.; Felding, Jakob; Baran, Phil S. (2017). "Scalable Synthesis of (−)-Thapsigargin". ACS Central Science. 3: 47. doi:10.1021/acscentsci.6b00313.
  11. ↑ Chen, Dezhi; Evans, P Andrew. (2017). "A Concise, Efficient and Scalable Total Synthesis of Thapsigargin and Nortrilobolide from (R)-(-)-Carvone". J. Am. Chem. Soc. 139: 6046. PMID 28422492. doi:10.1021/jacs.7b01734.

Further reading

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.