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17α-Epiestriol

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17α-Epiestriol
Names

IUPAC name Estra-1,3,5(10)-triene-3,16α,17α-triol
Systematic IUPAC name (1S,2R,3aS,3bR,9bS,11aS)-11a-Methyl-2,3,3a,3b,4,5,9b,10,11,11a-decahydro-1H-cyclopenta[a]phenanthrene-1,2,7-triol
Other names 17-Epiestriol; 16α-Hydroxy-17α-estradiol; 3,16α,17α-Trihydroxy-1,3,5(10)-estratriene
Identifiers
CAS Number	1228-72-4
3D model (JSmol)	Interactive image
ChEBI	CHEBI:42156
ChEMBL	ChEMBL1232445
ChemSpider	225189
DrugBank	DB07702
PubChem CID	256737
UNII	4G7IHY560Z
CompTox Dashboard (EPA)	DTXSID00858947
InChI InChI=1S/C18H24O3/c1-18-7-6-13-12-5-3-11(19)8-10(12)2-4-14(13)15(18)9-16(20)17(18)21/h3,5,8,13-17,19-21H,2,4,6-7,9H2,1H3/t13-,14-,15+,16-,17-,18+/m1/s1 Key: PROQIPRRNZUXQM-PNVOZDDCSA-N
SMILES CC12CCC3C(C1CC(C2O)O)CCC4=C3C=CC(=C4)O
Properties
Chemical formula	C₁₈H₂₄O₃
Molar mass	288.38136 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

17α-Epiestriol, or simply 17-epiestriol, also known as 16α-hydroxy-17α-estradiolorestra-1,3,5(10)-triene-3,16α,17α-triol, is a minor and weak endogenous estrogen, and the 17α-epimerofestriol (which is 16α-hydroxy-17β-estradiol).^[1]^[2]^[3] It is formed from 16α-hydroxyestrone.^[4]^[5] In contrast to other endogenous estrogens like estradiol, 17α-epiestriol is a selective agonist of the ERβ.^[6] It is described as a relatively weak estrogen, which is in accordance with its relatively low affinity for the ERα.^[7] 17α-Epiestriol has been found to be approximately 400-fold more potent than estradiol in inhibiting tumor necrosis factor α (TNFα)-induced vascular cell adhesion molecule 1 (VCAM-1) expression in vitro.^[8]

Relative affinities (%) of 17α-epiestriol and related steroids^[9]^[10]^[11]^[12]
Compound	PRTooltip Progesterone receptor	ARTooltip Androgen receptor	ERTooltip Estrogen receptor	GRTooltip Glucocorticoid receptor	MRTooltip Mineralocorticoid receptor	SHBGTooltip Sex hormone-binding globulin	CBGTooltip Corticosteroid binding globulin
Estradiol	2.6	7.9	100	0.6	0.13	8.7	<0.1
Alfatradiol	<1	<1	15	<1	<1	?	?
Estriol	<1	<1	15	<1	<1	?	?
16β-Epiestriol	<1	<1	20	<1	<1	?	?
17α-Epiestriol	<1	<1	31	<1	<1	?	?
Values are percentages (%). Reference ligands (100%) were progesterone for the PRTooltip progesterone receptor, testosterone for the ARTooltip androgen receptor, E2 for the ERTooltip estrogen receptor, DEXATooltip dexamethasone for the GRTooltip glucocorticoid receptor, aldosterone for the MRTooltip mineralocorticoid receptor, DHTTooltip dihydrotestosterone for SHBGTooltip sex hormone-binding globulin, and cortisol for CBGTooltip Corticosteroid-binding globulin.

References[edit]

^ Tewari AK (5 April 2013). Prostate Cancer: A Comprehensive Perspective. Springer Science & Business Media. pp. 373–. ISBN 978-1-4471-2864-9.

^ Labhart A (6 December 2012). Clinical Endocrinology: Theory and Practice. Springer Science & Business Media. pp. 522–. ISBN 978-3-642-96158-8.

^ Assali NS (3 September 2013). The Maternal Organism. Elsevier. pp. 341–. ISBN 978-1-4832-6380-9.

^ Von Euler US (2 December 2012). Comparative Endocrinology. Elsevier Science. pp. 135–. ISBN 978-0-323-14609-8.

^ Tietz NW (1 August 1976). Fundamentals of clinical chemistry. Saunders. p. 773. ISBN 978-0-7216-8866-4.

^ Sherbet GV (26 July 2013). Therapeutic Strategies in Cancer Biology and Pathology. Elsevier. pp. 83–. ISBN 978-0-12-416590-8.

^ Dorfman RI (22 October 2013). Steroidal Activity in Experimental Animals and Man. Elsevier Science. pp. 13–. ISBN 978-1-4832-7299-3.

^ Mukherjee TK, Nathan L, Dinh H, Reddy ST, Chaudhuri G (April 2003). "17-epiestriol, an estrogen metabolite, is more potent than estradiol in inhibiting vascular cell adhesion molecule 1 (VCAM-1) mRNA expression". The Journal of Biological Chemistry. 278 (14): 11746–52. doi:10.1074/jbc.M207800200. PMID 12547825.

^ Raynaud, J.P.; Ojasoo, T.; Bouton, M.M.; Philibert, D. (1979). "Receptor Binding as a Tool in the Development of New Bioactive Steroids". Drug Design. pp. 169–214. doi:10.1016/B978-0-12-060308-4.50010-X. ISBN 9780120603084.

^ Ojasoo T, Raynaud JP (November 1978). "Unique steroid congeners for receptor studies". Cancer Research. 38 (11 Pt 2): 4186–98. PMID 359134.

^ Ojasoo T, Delettré J, Mornon JP, Turpin-VanDycke C, Raynaud JP (1987). "Towards the mapping of the progesterone and androgen receptors". Journal of Steroid Biochemistry. 27 (1–3): 255–69. doi:10.1016/0022-4731(87)90317-7. PMID 3695484.

^ Raynaud JP, Bouton MM, Moguilewsky M, Ojasoo T, Philibert D, Beck G, Labrie F, Mornon JP (January 1980). "Steroid hormone receptors and pharmacology". Journal of Steroid Biochemistry. 12: 143–57. doi:10.1016/0022-4731(80)90264-2. PMID 7421203.