3α-Dihydroprogesterone

3α-Dihydroprogesterone
Names
	IUPAC name 3α-Hydroxypregn-4-en-20-one
	Systematic IUPAC name 1-[(1S,3aS,3bS,7R,9aR,9bS,11aS)-7-Hydroxy-9a,11a-dimethyl-2,3,3a,3b,4,5,7,8,9,9a,9b,10,11,11a-tetradecahydro-1H-cyclopenta[a]phenanthren-1-yl]ethan-1-one
	Other names 3α-Dihydroprogesterone
Identifiers
CAS Number	25680-68-6;
3D model (JSmol)	Interactive image;
ChemSpider	108793;
PubChem CID	121951;
UNII	6U8M6JFV3W ;
CompTox Dashboard (EPA)	DTXSID50948564 ;
	InChI InChI=1S/C21H32O2/c1-13(22)17-6-7-18-16-5-4-14-12-15(23)8-10-20(14,2)19(16)9-11-21(17,18)3/h12,15-19,23H,4-11H2,1-3H3/t15-,16+,17-,18+,19+,20+,21-/m1/s1 Key: QWVWXRKHAXWWSV-QYYVTAPASA-N;
	SMILES CC(=O)[C@H]1CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2CCC4=C[C@@H](CC[C@]34C)O)C;
Properties
Chemical formula	C21H32O2
Molar mass	316.485 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

3α-Dihydroprogesterone (3α-DHP), also known as 3α-hydroxyprogesterone, as well as pregn-4-en-3α-ol-20-one, is an endogenous neurosteroid.^[1] It is biosynthesized by 3α-hydroxysteroid dehydrogenase from progesterone.^[1] 3α-DHP has been found to act as a positive allosteric modulator of the GABA_A receptor and is described as being as active as allopregnanolone in regard to this action.^[1] In accordance, it has anxiolytic effects in animals.^[2] 3α-DHP has also been found to inhibit the secretion of follicle-stimulating hormone (FSH) from the rat pituitary gland, demonstrating possible antigonadotropic properties.^[1] Unlike the case of most other inhibitory neurosteroids, 3α-DHP production is not blocked by 5α-reductase inhibitors like finasteride.^[1] No data were available on the progestogenic activity of 3α-DHP as of 1977.^[3] Levels of 5α-DHP have been quantified.^[4]

Chemistry

^ ^a ^b ^c ^d ^e Neurosteroids and Brain Function. Academic Press. 12 December 2001. pp. 484–. ISBN 978-0-08-054423-6.
^ Kavaliers, Martin; Wiebe, John P.; Galea, Liisa A.M. (1 May 1994). "Reduction of predator odor-induced anxiety in mice by the neurosteroid 3 alpha-hydroxy-4-pregnen-20-one (3 alpha HP)". Brain Research. 645 (1–2): 325–329. doi:10.1016/0006-8993(94)91667-5. ISSN 0006-8993. PMID 7914815. S2CID 53259529. Wikidata Q48124086.
^ Junkermann H, Runnebaum B, Lisboa BP (July 1977). "New progesterone metabolites in human myometrium". Steroids. 30 (1): 1–14. doi:10.1016/0039-128x(77)90131-3. PMID 919010. S2CID 28420255.
^ Trabert B, Falk RT, Stanczyk FZ, McGlynn KA, Brinton LA, Xu X (September 2015). "Reproducibility of an assay to measure serum progesterone metabolites that may be related to breast cancer risk using liquid chromatography-tandem mass spectrometry". Horm Mol Biol Clin Investig. 23 (3): 79–84. doi:10.1515/hmbci-2015-0026. PMC 4966666. PMID 26353176.