16α-Hydroxyprogesterone

16α-Hydroxyprogesterone.svg skin-invert-image 225px 16α-Hydroxypregn-4-ene-3,20-dione (1R,2R,3aS,3bS,9aR,9bS,11aS)-1-Acetyl-2-hydroxy-9a,11a-dimethyl-1,2,3,3a,3b,4,5,8,9,9a,9b,10,11,11a-tetradecahydro-7H-cyclopenta[a]phenanthren-7-one 16α-OHP; 16α-OH-PROG 438-07-3 15826 1908005 213144 243761 CC(=O)[C@H]1[C@@H](C[C@@H]2[C@@]1(CC[C@H]3[C@H]2CCC4=CC(=O)CC[C@]34C)C)O 1S/C21H30O3/c1-12(22)19-18(24)11-17-15-5-4-13-10-14(23)6-8-20(13,2)16(15)7-9-21(17,19)3/h10,15-19,24H,4-9,11H2,1-3H3/t15-,16+,17+,18-,19+,20+,21+/m1/s1 LOVNYFVWYTXDRE-RMWFXKKMSA-N Y7JT9A46EO 21 30 3 16α-Hydroxyprogesterone (16α-OHP), also known as 16α-hydroxypregn-4-ene-3,20-dione, is a minor endogenous progestogen steroid hormone and a metabolite of progesterone that is formed in lower amounts than 17α-hydroxyprogesterone (17α-OHP). Storbeck KH, Swart P, Africander D, Conradie R, Louw R, Swart AC 16α-hydroxyprogesterone: origin, biosynthesis and receptor interaction Mol. Cell. Endocrinol. 336 1–2 92–101 2011 21095220 10.1016/j.mce.2010.11.016 5503049 It occurs in micromolar concentrations and its physiological relevance hence is questionable. However, it may accumulate in target tissues and could have a physiological role in the reproductive system and mammary gland development as well as the cardiovascular and central nervous systems. 16α-OHP is formed from progesterone via 16α-hydroxylation primarily by CYP17A1 and primarily in steroidogenic tissues including the adrenal glands, testes, and ovaries. It is also synthesized from progesterone during pregnancy by hepatic cytochrome P450 enzymes like CYP3A4 and CYP1A1 in the fetal liver as well as placenta. It appears to be an end metabolite of progesterone and does not seem to be further metabolized. 16α-OHP has approximately 67% and 43% of the affinity of progesterone for the PR-A and PR-B, respectively, and acts as an agonist of these receptors similarly to progesterone. It was found to produce natriuresis similar to that produced by spironolactone when administered to humans, suggesting that it also has antimineralocorticoid activity similarly to progesterone. However, surprisingly, 16α-OHP showed low affinity for the mineralocorticoid receptor (MR) of greater than 1 μM (compared to 1 nM for progesterone) and showed no antagonism of the MR at up to a concentration of 1 μM (whereas progesterone shows potent such activity). However, the findings of another study suggested that 16α-OHP antagonizes the effects of aldosterone via the MR, and it may still be possible that 16α-OHP has significant antimineralocorticoid activity in some cells in spite of its weak MR affinity. See also 5α-Dihydroprogesterone 11-Deoxycorticosterone (21-hydroxyprogesterone) 20-Dihydroprogesterone Algestone (16α,17α-dihydroxyprogesterone) References 2 Category:Antimineralocorticoids Category:Diketones Category:Pregnanes Category:Progestogens Category:Steroid hormones