Chemistry:Estradiol glucuronide

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Estradiol glucuronide
Estradiol 17β-D-glucuronide.svg
Names
IUPAC name
3-Hydroxyestra-1,3,5(10)-trien-17β-yl β-D-glucopyranosiduronic acid
Systematic IUPAC name
(2S,3S,4S,5R,6R)-3,4,5-Trihydroxy-6-{[(1S,3aS,3bR,9bS,11aS)-7-hydroxy-11a-methyl-2,3,3a,3b,4,5,9b,10,11,11a-decahydro-1H-cyclopenta[a]phenanthren-1-yl]oxy}oxane-2-carboxylic acid
Other names
E217βG; 17β-Estradiol 17β-D-glucuronide; Estra-1,3,5(10)-triene-3,17β-diol 17β-D-glucuronoside
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
KEGG
Properties
C24H32O8
Molar mass 448.512 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Tracking categories (test):

Estradiol glucuronide, or estradiol 17β-D-glucuronide, is a conjugated metabolite of estradiol.[1] It is formed from estradiol in the liver by UDP-glucuronyltransferase via attachment of glucuronic acid and is eventually excreted in the urine by the kidneys.[1] It has much higher water solubility than does estradiol.[1] Glucuronides are the most abundant estrogen conjugates.[1]

When exogenous estradiol is administered orally, it is subject to extensive first-pass metabolism (95%) in the intestines and liver.[2][3] A single administered dose of estradiol is absorbed 15% as estrone, 25% as estrone sulfate, 25% as estradiol glucuronide, and 25% as estrone glucuronide.[2] Formation of estrogen glucuronide conjugates is particularly important with oral estradiol as the percentage of estrogen glucuronide conjugates in circulation is much higher with oral ingestion than with parenteral estradiol.[2] Estradiol glucuronide can be converted back into estradiol, and a large circulating pool of estrogen glucuronide and sulfate conjugates serves as a long-lasting reservoir of estradiol that effectively extends its elimination half-life of oral estradiol.[2] In demonstration of the importance of first-pass metabolism and the estrogen conjugate reservoir in the pharmacokinetics of estradiol,[2] the elimination half-life of oral estradiol is 13 to 20 hours[4] whereas with intravenous injection its elimination half-life is only about 1 to 2 hours.[5]

Approximately 7% of estradiol is excreted in the urine as estradiol glucuronide.[6]

Estradiol glucuronide is transported into prostate gland, testis, and breast cells by OATP1A2, OATP1B1, OATP1B3, OATP1C1, and OATP3A1.[7] The ABC transporters MRP2, MRP3, MRP4, and BCRP, as well as several other transporters, have been found to transport estradiol glucuronide out of cells.[7][8]

The circulating concentrations of estrogen glucuronides are generally more than 10-fold lower than those of estrone sulfate, the most abundant estrogen conjugate in the circulation.[8]

Estradiol glucuronide has been identified as an agonist of the G protein-coupled estrogen receptor (GPER), a membrane estrogen receptor.[9] This may be involved in estradiol glucuronide-induced cholestasis.[9]

Estrogen glucuronides can be deglucuronidated into the corresponding free estrogens by β-glucuronidase in tissues that express this enzyme, such as the mammary gland.[10] As a result, estrogen glucuronides have estrogenic activity via conversion into estrogens.[10]

Estradiol glucuronide shows about 300-fold lower potency in activating the estrogen receptors relative to estradiol in vitro.[11]

The positional isomer of estradiol glucuronide, estradiol 3-glucuronide, also occurs as a major endogenous metabolite of estradiol, circulating at two-thirds of the levels of estrone sulfate when it reaches its maximal concentrations just before ovulation and during the peak in estradiol levels that occurs at this time.[12]


See also

References

  1. ↑ 1.0 1.1 1.2 1.3 "Human Metabolome Database: Showing metabocard for 17-beta-Estradiol glucuronide (HMDB0010317)". http://www.hmdb.ca/metabolites/HMDB10317. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Michael Oettel; Ekkehard Schillinger (6 December 2012). Estrogens and Antiestrogens II: Pharmacology and Clinical Application of Estrogens and Antiestrogen. Springer Science & Business Media. pp. 268–. ISBN 978-3-642-60107-1. https://books.google.com/books?id=wBvyCAAAQBAJ&pg=PA268. 
  3. ↑ M. Notelovitz; P.A. van Keep (6 December 2012). The Climacteric in Perspective: Proceedings of the Fourth International Congress on the Menopause, held at Lake Buena Vista, Florida, October 28–November 2, 1984. Springer Science & Business Media. pp. 406–. ISBN 978-94-009-4145-8. https://books.google.com/books?id=VM0hBQAAQBAJ&pg=PA406. 
  4. ↑ Stanczyk, Frank Z.; Archer, David F.; Bhavnani, Bhagu R. (2013). "Ethinyl estradiol and 17β-estradiol in combined oral contraceptives: pharmacokinetics, pharmacodynamics and risk assessment". Contraception 87 (6): 706–727. doi:10.1016/j.contraception.2012.12.011. ISSN 0010-7824. PMID 23375353. 
  5. ↑ "Pharmacokinetic and pharmacological features of oestradiol valerate". Maturitas 4 (4): 315–24. 1982. doi:10.1016/0378-5122(82)90064-0. PMID 7169965. 
  6. ↑ Kelly Smith; Daniel M. Riche; Nickole Henyan (15 April 2010). Clinical Drug Data, 11th Edition. McGraw Hill Professional. ISBN 978-0-07-162686-6. https://books.google.com/books?id=bi6-qSVcRZwC. 
  7. ↑ 7.0 7.1 "The Regulation of Steroid Action by Sulfation and Desulfation". Endocr. Rev. 36 (5): 526–63. October 2015. doi:10.1210/er.2015-1036. PMID 26213785. 
  8. ↑ 8.0 8.1 "Efflux transport of estrogen glucuronides by human MRP2, MRP3, MRP4 and BCRP". J. Steroid Biochem. Mol. Biol. 178: 99–107. April 2018. doi:10.1016/j.jsbmb.2017.11.007. PMID 29175180. 
  9. ↑ 9.0 9.1 "G-protein-coupled receptor 30/adenylyl cyclase/protein kinase A pathway is involved in estradiol 17ß-D-glucuronide-induced cholestasis". Hepatology 59 (3): 1016–29. March 2014. doi:10.1002/hep.26752. PMID 24115158. 
  10. ↑ 10.0 10.1 "Functional role of estrogen metabolism in target cells: review and perspectives". Carcinogenesis 19 (1): 1–27. January 1998. doi:10.1093/carcin/19.1.1. PMID 9472688. 
  11. ↑ "Evaluation of a recombinant yeast cell estrogen screening assay". Environ. Health Perspect. 105 (7): 734–42. July 1997. doi:10.1289/ehp.97105734. PMID 9294720. 
  12. ↑ F. A. Kincl; J. R. Pasqualini (22 October 2013). Hormones and the Fetus: Volume 1: Production, Concentration and Metabolism During Pregnancy. Elsevier Science. pp. 39–. ISBN 978-1-4832-8538-2. https://books.google.com/books?id=0ly2AgAAQBAJ&pg=PA39. 

External links



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