Chemistry:5β-Dihydroprogesterone

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5β-Dihydroprogesterone
5β-Dihydroprogesterone.svg
Names
IUPAC name
5β-Pregnane-3,20-dione
Systematic IUPAC name
(1S,3aS,3bR,5aR,9aS,9bS,11aS)-1-Acetyl-9a,11a-dimethylhexadecahydro-7H-cyclopenta[a]phenanthren-7-one
Other names
Pregnanedione
Identifiers
3D model (JSmol)
ChemSpider
UNII
Properties
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
Tracking categories (test):

5β-Dihydroprogesterone (5β-DHP, pregnanedione, or 5β-pregnane-3,20-dione) is an endogenous neurosteroid and an intermediate in the biosynthesis of pregnanolone and epipregnanolone from progesterone.[1][2][3] It is synthesized from progesterone by the enzyme 5β-reductase.[1][4]

5β-DHP has been found to act as a positive allosteric modulator of the GABAA receptor (albeit with an affinity for this receptor regarded as relatively low in comparison to 3α-hydroxylated progesterone metabolites such as pregnanolone and allopregnanolone)[5] and also as a negative allosteric modulator of the GABAA-rho receptor.[6] In accordance with the former action, it has been found to possess anesthetic, anxiolytic, and antinociceptive effects.[7][5][8][9] 5β-DHP has been found to act as an agonist of the pregnane X receptor (PXR) as well (albeit weakly (EC50 >10,000 μM)),[10] and has been found to regulate uterine contractility through activation of this receptor.[11][12] Unlike 5α-dihydroprogesterone, 5β-DHP possesses only very weak affinity for the progesterone receptor (1.2% of that of progesterone in rhesus monkey uterus), and in relation to this, is not a notable progestogen.[13][14]

A study found that 5β-DHP, but not progesterone, directly bound to and antagonized the oxytocin receptor at nanomolar concentrations, and it was suggested that this may be one of the mechanisms by which progesterone maintains pregnancy.[15][16][17] However, a subsequent study was unable to replicate this finding, and there has been no further investigation since.[16] In any case, 5β-DHP has nonetheless been shown to possess tocolytic effects in animals, and this may alternatively be mediated by activation of the PXR.[12]

See also

References

  1. ↑ 1.0 1.1 Neurosteroids and Brain Function. Academic Press. 12 December 2001. pp. 464–. ISBN 978-0-08-054423-6. https://books.google.com/books?id=BJumUEbiaPYC&pg=PA464. 
  2. ↑ Neurosteroids. Frontiers E-books. pp. 8–. ISBN 978-2-88919-078-2. https://books.google.com/books?id=fSgNRlZUwt0C&pg=PA8. 
  3. ↑ Gilbert Evans, Susan E.; Ross, Lori E.; Sellers, Edward M.; Purdy, Robert H.; Romach, Myroslava K. (2005). "3α-reduced neuroactive steroids and their precursors during pregnancy and the postpartum period". Gynecological Endocrinology 21 (5): 268–279. doi:10.1080/09513590500361747. ISSN 0951-3590. PMID 16373246. 
  4. ↑ "5 Beta-dihydroprogesterone and steroid 5 beta-reductase decrease in association with human parturition at term". Mol. Hum. Reprod. 11 (7): 495–501. 2005. doi:10.1093/molehr/gah201. PMID 16123077. 
  5. ↑ 5.0 5.1 Ocvirk, Rok; Pearson Murphy, Beverley E.; Franklin, Keith B.J.; Abbott, Frances V. (2008). "Antinociceptive profile of ring A-reduced progesterone metabolites in the formalin test". Pain 138 (2): 402–409. doi:10.1016/j.pain.2008.01.019. ISSN 0304-3959. PMID 18343034. 
  6. ↑ "Differential modulation of the gamma-aminobutyric acid type C receptor by neuroactive steroids". Mol. Pharmacol. 56 (4): 752–9. 1999. PMID 10496958. 
  7. ↑ Selye, H. (1941). "Anesthetic Effect of Steroid Hormones.". Experimental Biology and Medicine 46 (1): 116–121. doi:10.3181/00379727-46-11907. ISSN 1535-3702. 
  8. ↑ Leb, Colette R.; Hu, Fen-Yun; Pearson Murphy, Beverley E. (1997). "Metabolism of Progesterone by Human Lymphocytes: Production of Neuroactive Steroids". The Journal of Clinical Endocrinology & Metabolism 82 (12): 4064–4068. doi:10.1210/jcem.82.12.4354. ISSN 0021-972X. PMID 9398714. 
  9. ↑ Rodgers, R (1998). "Behaviorally Selective Effects of Neuroactive Steroids on Plus-Maze Anxiety in Mice". Pharmacology Biochemistry and Behavior 59 (1): 221–232. doi:10.1016/S0091-3057(97)00339-0. ISSN 0091-3057. PMID 9443559. 
  10. ↑ "The human orphan nuclear receptor PXR is activated by compounds that regulate CYP3A4 gene expression and cause drug interactions". J. Clin. Invest. 102 (5): 1016–23. 1998. doi:10.1172/JCI3703. PMID 9727070. 
  11. ↑ Hagedorn, K. A.; Cooke, C.-L.; Falck, J. R.; Mitchell, B. F.; Davidge, S. T. (2006). "Regulation of Vascular Tone During Pregnancy: A Novel Role for the Pregnane X Receptor". Hypertension 49 (2): 328–333. doi:10.1161/01.HYP.0000253478.51950.27. ISSN 0194-911X. PMID 17159084. 
  12. ↑ 12.0 12.1 Mitchell, Bryan F.; Mitchell, Jana M.; Chowdhury, Jeeshan; Tougas, Michelle; Engelen, Sanne M.E.; Senff, Nancy; Heijnen, Iris; Moore, John T. et al. (2005). "Metabolites of progesterone and the pregnane X receptor: A novel pathway regulating uterine contractility in pregnancy?". American Journal of Obstetrics and Gynecology 192 (4): 1304–1313. doi:10.1016/j.ajog.2005.01.040. ISSN 0002-9378. PMID 15846226. 
  13. ↑ Lima-Hernández, Francisco J.; Beyer, Carlos; Gómora-Arrati, Porfirio; García-Juárez, Marcos; Encarnación-Sánchez, José L.; Etgen, Anne M.; González-Flores, Oscar (2012). "Src kinase signaling mediates estrous behavior induced by 5β-reduced progestins, GnRH, prostaglandin E2 and vaginocervical stimulation in estrogen-primed rats". Hormones and Behavior 62 (5): 579–584. doi:10.1016/j.yhbeh.2012.09.004. ISSN 0018-506X. PMID 23010621. 
  14. ↑ "A specific progesterone receptor of myometrial cytosol from the rhesus monkey". J. Steroid Biochem. 8 (2): 157–60. February 1977. doi:10.1016/0022-4731(77)90040-1. PMID 405534. 
  15. ↑ Alexandros Makriyannis; Diane Biegel (4 November 2003). Drug Discovery Strategies and Methods. CRC Press. pp. 190–. ISBN 978-0-8247-5767-0. https://books.google.com/books?id=QuA_gB3DRpsC&pg=PA190. 
  16. ↑ 16.0 16.1 Creasy, Robert K.; Resnik, Robert; Iams, Jay D.; Lockwood, Charles J.; Greene, Michael F.; Moore, Thomas R. (2013). Creasy and Resnik's Maternal-Fetal Medicine: Principles and Practice. Elsevier Health Sciences. pp. 72–. ISBN 978-1-4557-1137-6. https://books.google.com/books?id=AbMKAQAAQBAJ&pg=PA72. 
  17. ↑ Knobil and Neill's Physiology of Reproduction. Academic Press. 12 December 2005. pp. 2952–. ISBN 978-0-08-053527-2. https://books.google.com/books?id=1_1cDe92k_YC&pg=PA2952. 



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