7α-Thioprogesterone

7α-Thioprogesterone (7α-TP4; developmental code name SC-8365; also known as 7α-mercaptopregn-4-ene-3,20-dione) is a synthetic, steroidal, and potent antimineralocorticoid (putative) and antiandrogen which was developed by G. D. Searle & Co and was described in the late 1970s and early 1980s but was never developed or introduced for medical use.[1][2][3] It is a derivative of progesterone (pregn-4-ene-3,20-dione) with a thio (sulfur) substitution at the C7α position, and is related to the spirolactone group of drugs but lacks a γ-lactone ring.[1][2]

7α-Thioprogesterone
Clinical data
Other names7α-TP4; SC-8365; 7α-Mercaptopregn-4-ene-3,20-dione
Identifiers
  • (1S,3aS,3bS,4R,9aR,9bS,11aS)-1-Acetyl-9a,11a-dimethyl-4-sulfanyl-1H,2H,3H,3aH,3bH,4H,5H,7H,8H,9H,9aH,9bH,10H,11H,11aH-cyclopenta[a]phenanthren-7-one
Chemical and physical data
FormulaC21H28O2S
Molar mass344.51 g·mol−1
3D model (JSmol)
  • O=C(C)[C@]1CC[C@]([H])2[C@@]([H])3[C@](S[H])CC4=CC(CC[C@]4(C)[C@@]3([H])CC[C@@]21C)=O
  • InChI=1S/C21H28O2S/c1-12(22)15-4-5-16-19-17(7-9-21(15,16)3)20(2)8-6-14(23)10-13(20)11-18(19)24/h10,16-17,19,24H,4-9,11H2,1-3H3/t16-,17-,19-,20-,21+/m0/s1
  • Key:MTDUGSYXIPHNBV-JZTRKIHISA-N

As an antiandrogen, 7α-TP4 has approximately 8.5% of the affinity of dihydrotestosterone (DHT) for the rat ventral prostate androgen receptor (AR), which is similar to that of spironolactone and its active metabolite 7α-thiomethylspironolactone.[1] The drug has also been assessed at steroid hormone-associated carrier proteins, and shows very low binding to sex hormone-binding globulin (SHBG) but high affinity for corticosteroid-binding globulin (CBG) approximately equal to that of progesterone.[2]

7α-Acetylthio-17α-hydroxyprogesterone, a related derivative of progesterone and also of 17α-hydroxyprogesterone, has been found to possess potent antimineralocorticoid activity similarly.[4] Spironolactone is the derivative of this compound in which the acetyl group at the C17β position has been cyclized with the C17α hydroxyl group to form a spiro 21-carboxylic acid γ-lactone ring.[5][6][7]

References
  1. Cutler GB, Pita JC, Rifka SM, Menard RH, Sauer MA, Loriaux DL (1978). "SC 25152: A potent mineralocorticoid antagonist with reduced affinity for the 5 alpha-dihydrotestosterone receptor of human and rat prostate". J. Clin. Endocrinol. Metab. 47 (1): 171–5. doi:10.1210/jcem-47-1-171. PMID 263288.
  2. Pugeat MM, Dunn JF, Nisula BC (1981). "Transport of steroid hormones: interaction of 70 drugs with testosterone-binding globulin and corticosteroid-binding globulin in human plasma". J. Clin. Endocrinol. Metab. 53 (1): 69–75. doi:10.1210/jcem-53-1-69. PMID 7195405.
  3. Ulrich Westphal (6 December 2012). Steroid-Protein Interactions II. Springer Science & Business Media. pp. 501–. ISBN 978-3-642-82486-9.
  4. Ralph I. Dorfman (5 December 2016). Steroidal Activity in Experimental Animals and Man. Elsevier Science. pp. 395–. ISBN 978-1-4832-7299-3.
  5. J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. p. 1111. ISBN 978-1-4757-2085-3. Archived from the original on 15 February 2017.
  6. "Spironolactone". Archived from the original on 2016-06-30. Retrieved 2017-07-04.
  7. "Spironolactone | C24H32O4S | ChemSpider".



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