16α-hydroxyestrone

16α-Hydroxyestrone

16α-Hydroxyestrone

Chemical compound

16α-Hydroxyestrone (16α-OH-E1), or hydroxyestrone, also known as estra-1,3,5(10)-triene-3,16α-diol-17-one, is an endogenous steroidal estrogen and a major metabolite of estrone, as well as an intermediate in the biosynthesis of estriol.[1][2] It is a potent estrogen similarly to estrone, and it has been suggested that the ratio of 16α-hydroxyestrone to 2-hydroxyestrone, the latter being much less estrogenic in comparison and even antiestrogenic in the presence of more potent estrogens like estradiol, may be involved in the pathophysiology of breast cancer.[1] Conversely, 16α-hydroxyestrone may help to protect against osteoporosis.[1]

Quick Facts Names, Identifiers ...

In terms of relative binding affinity (RBA) for the rat uterine estrogen receptor, 16α-hydroxyestrone showed 2.8% of the affinity of estradiol.[3] For comparison, estrone had 11% of the affinity and estriol had 10% of the affinity of estradiol.[3] In contrast to other estrogens, the binding of 16α-hydroxyestrone to the estrogen receptor is reported to be covalent and irreversible.[4][5][6][7] 16α-Hydroxyestrone has been reported to have 25% of the vaginal estrogenic potency of estradiol.[3] The maximal uterotrophic and antigonadotropic effect of 16α-hydroxyestrone was equivalent to those of estradiol and estriol, indicating that 16α-hydroxyestrone is a fully effective estrogen.[3][8] However, 16α-hydroxyestrone was much less potent than estradiol or estrone.[8]

The C3 and C16α diacetate ester of 16α-hydroxyestrone, hydroxyestrone diacetate (brand names Colpoginon, Colpormon, Hormobion, and Hormocervix), has been marketed and used medically as an estrogen in Europe.[9][10]

More information Estrogen, ERTooltip Estrogen receptor RBATooltip relative binding affinity (%) ...

See also

References

  1. [1]
    Rakel D (2012). Integrative Medicine. Elsevier Health Sciences. pp. 338–339. ISBN 978-1-4377-1793-8.
  2. [2]
    Vitamins and Hormones. Academic Press. 7 September 2005. pp. 282–. ISBN 978-0-08-045978-3.
  3. [3]
    Fishman J, Martucci C (September 1980). "Biological properties of 16 alpha-hydroxyestrone: implications in estrogen physiology and pathophysiology". J. Clin. Endocrinol. Metab. 51 (3): 611–5. doi:10.1210/jcem-51-3-611. PMID 7190977.
  4. [4]
    Oettel M, Schillinger E (6 December 2012). Estrogens and Antiestrogens I: Physiology and Mechanisms of Action of Estrogens and Antiestrogens. Springer Science & Business Media. pp. 252–. ISBN 978-3-642-58616-3.
  5. [5]
    Swaneck GE, Fishman J (November 1988). "Covalent binding of the endogenous estrogen 16 alpha-hydroxyestrone to estradiol receptor in human breast cancer cells: characterization and intranuclear localization". Proc. Natl. Acad. Sci. U.S.A. 85 (21): 7831–5. Bibcode:1988PNAS...85.7831S. doi:10.1073/pnas.85.21.7831. PMC 282290. PMID 3186693.
  6. [6]
    Zhu BT, Conney AH (January 1998). "Functional role of estrogen metabolism in target cells: review and perspectives". Carcinogenesis. 19 (1): 1–27. doi:10.1093/carcin/19.1.1. PMID 9472688.
  7. [7]
    Kuhl H (2005). "Pharmacology of estrogens and progestogens: influence of different routes of administration" (PDF). Climacteric. 8 (Suppl 1): 3–63. doi:10.1080/13697130500148875. PMID 16112947. S2CID 24616324.
  8. [8]
    Velardo, Joseph Thomas (1964). "The Actions of Steroid Hormones on Estradiol-17β in Uterine Growth and Enzymorphology". Hormonal Steroids Biochemistry, Pharmacology, and Therapeutics. pp. 463–490. doi:10.1016/B978-0-12-395506-7.50065-0. ISBN 9780123955067.
  9. [9]
    Index Nominum 2000: International Drug Directory. Taylor & Francis. January 2000. pp. 1250–. ISBN 978-3-88763-075-1.
  10. [10]
    Muller NF, Dessing RP, European Society of Clinical Pharmacy (19 June 1998). European Drug Index: European Drug Registrations (Fourth ed.). CRC Press. pp. 289–. ISBN 978-3-7692-2114-5.



Stub icon

This article about a steroid is a stub. You can help Wikipedia by expanding it.

Stub icon

This drug article relating to the genito-urinary system is a stub. You can help Wikipedia by expanding it.
Share this article:

This article uses material from the Wikipedia article 16α-hydroxyestrone, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.