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7α-Thiomethylspironolactone (7α-TMS; developmental code name SC-26519) is a steroidal antimineralocorticoid and antiandrogen of the spirolactone group and the major active metabolite of spironolactone. Other important metabolites of spironolactone include 7α-thiospironolactone (7α-TS; SC-24813), 6β-hydroxy-7α-thiomethylspironolactone (6β-OH-7α-TMS), and canrenone (SC-9376).
Spironolactone is a prodrug with a short terminal half-life of 1.4 hours. The active metabolites of spironolactone have extended terminal half-lives of 13.8 hours for 7α-TMS, 15.0 hours for 6β-OH-7α-TMS, and 16.5 hours for canrenone, and accordingly, these metabolites are responsible for the therapeutic effects of the drug.
7α-TS and 7α-TMS have been found to possess approximately equivalent affinity for the rat ventral prostate androgen receptor (AR) relative to that of spironolactone. The affinity of 7α-TS, 7α-TMS, and spironolactone for the rat prostate AR is about 3.0 to 8.5% of that of dihydrotestosterone (DHT).
7α-TMS has been found to account for around 80% of the potassium-sparing effect of spironolactone, whereas canrenone accounts for the remaining approximate 10 to 25% of the potassium-sparing effect of the drug.
See also
- 7α-Thiomethylspironolactone sulfoxide
- 7α-Thioprogesterone
References
Further reading
- Gardiner P, Schrode K, Quinlan D, Martin BK, Boreham DR, Rogers MS, et al. (April 1989). "Spironolactone metabolism: steady-state serum levels of the sulfur-containing metabolites". Journal of Clinical Pharmacology. 29 (4): 342–347. doi:10.1002/j.1552-4604.1989.tb03339.x. PMID 2723123. S2CID 29457093.
