PMID:20599615

Citation	Attardi, BJ, Hild, SA, Koduri, S, Pham, T, Pessaint, L, Engbring, J, Till, B, Gropp, D, Semon, A and Reel, JR (2010) The potent synthetic androgens, dimethandrolone (7α,11β-dimethyl-19-nortestosterone) and 11β-methyl-19-nortestosterone, do not require 5α-reduction to exert their maximal androgenic effects. J. Steroid Biochem. Mol. Biol. 122:212-8
Abstract	Dimethandrolone (DMA: 7α,11β-dimethyl-19-nortestosterone) and 11β-methyl-19-nortestosterone (MNT) are potent androgens in development for hormonal therapy in men. As 5α-reduced androgens, such as 5α-dihydrotestosterone (DHT), may raise the risk of benign prostate hyperplasia, accelerate the development of prostate carcinoma, and increase male pattern baldness and acne, we investigated the role of 5α-reduction in the androgenic activity of DMA and MNT. The authentic 5α-reduced metabolites, 5α-dihydroDMA (5α-DHDMA) and 5α-dihydroMNT (5α-DHMNT), were prepared by chemical synthesis and compared in vitro and in vivo to the parent compounds. Both 5α-reduced androgens bound with high affinity to the rat androgen receptor (AR) and were potent inducers of transactivation of 3XHRE-LUC in CV-1 cells cotransfected with a human AR expression plasmid. To examine in vivo androgenic (stimulation of ventral prostate [VP] and seminal vesicle [SV] weights) and anabolic (stimulation of levator ani [LA] muscle weights) activity, 22-day-old castrate male rats were treated sc for 7 days with various doses of DMA, 5α-DHDMA, or testosterone (T) or MNT, 5α-DHMNT, or T and necropsied on day 8. 5α-DHDMA was at least threefold more potent than T in stimulating growth of the VP but only 30-40% as potent as DMA. 5α-DHMNT was four- to eightfold more potent than T, whereas MNT was approximately equipotent to T. To assess the possible role of 5α-reduction in VP and SV growth, castrate immature rats were treated with maximally effective doses of T, DHT, DMA, MNT, or the related 19-norandrogen, 7α-methyl-19-nortestosterone (MENT), or vehicle, with or without dutasteride (DUT), an inhibitor of 5α-reductases types 1 and 2. In rats treated with T+DUT, serum T was significantly higher (P<0.05) than in rats treated with T alone, and serum DHT was decreased (P<0.001) to levels observed in castrate vehicle-treated rats. DUT significantly reduced both VP and SV weights in T-treated rats, whereas there was no significant effect of DUT on weights of these accessory sex glands in rats treated with DMA, MNT, DHT, or MENT. These results indicate that inhibition of 5α-reductase activity in vivo does not affect the androgenic potency of DMA, MNT, or MENT.
Links	PubMed PMC2949447 Online version:10.1016/j.jsbmb.2010.06.009
Keywords	3-Oxo-5-alpha-Steroid 4-Dehydrogenase/metabolism; Animals; Dihydrotestosterone/pharmacology; Dihydrotestosterone/therapeutic use; Humans; Male; Nandrolone/analogs & derivatives; Nandrolone/pharmacology; Nandrolone/therapeutic use; Organ Size/drug effects; Prostate/drug effects; Rats; Rats, Sprague-Dawley; Receptors, Androgen/metabolism; Seminal Vesicles/drug effects; Testosterone/pharmacology; Testosterone/therapeutic use; Testosterone Congeners/pharmacology; Testosterone Congeners/therapeutic use
edit table

Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
RAT:ANDR	Contributes to	GO:0060737: prostate gland morphogenetic growth	ECO:0000314:		P		Figure 1A and 2A	complete CACAO 3501

References

See Help:References for how to manage references in GONUTS.