Direct agonist/antagonist functions of dehydroepiandrosterone.

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Chen F, Knecht K, Birzin E, Fisher J, Wilkinson H, Mojena M, Moreno CT, Schmidt A, Harada S, Freedman LP, Reszka AA

Direct agonist/antagonist functions of dehydroepiandrosterone.

Endocrinology. 2005 Nov;146(11):4568-76. Epub 2005 Jun 30.

PubMed ID

15994348 [ View in PubMed

]

Abstract

Dehydroepiandrosterone (DHEA) exhibits peak adrenal secretion in the fetus at term and around age 30 yr in the adult. Levels then progressively decline, which is associated with decreased levels of testosterone, dihydrotestosterone, and estrogen in peripheral tissues. DHEA supplementation in postmenopausal women increases bone formation and density, an effect mainly attributed to peripheral conversion to sex hormones. In this study, we tested DHEA for direct effects on the androgen (AR) and estrogen (ER) receptors. DHEA bound to AR with a Ki of 1 microM, which was associated with AR transcriptional antagonism on both the mouse mammary tumor virus and prostate-specific antigen promoters, much like the effects of bicalutamide. Unlike bicalutamide, DHEA stimulated, rather than inhibited, LNCaP cell growth, suggesting possible interaction with other hormone receptors. Indeed DHEA bound to ERalpha and ERbeta, with Ki values of 1.1 and 0.5 microM, respectively. Despite the similar binding affinities, DHEA showed preferential agonism of ERbeta with an EC50 of approximately 200 nm and maximal activation at 1 microM. With ERalpha we found 30-70% agonism at 5 microM, depending on the assay. Physiological levels of DHEA are approximately 30 nM and up to 90 nM in the prostate. DHEA at 30 nM is actually sufficient to activate ERbeta transcription to the same degree as estrogen at its circulating concentration, and additive effects are seen when the two were combined. Taken together, DHEA has the potential for physiologically relevant direct activation of ERbeta. With peak levels at term and age 30 yr, there is also a potential for antagonist effects on AR and partial agonism of ERalpha.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Prasterone	Androgen receptor	Protein	Humans	Unknown	Agonist	Details
Prasterone	Estrogen receptor alpha	Protein	Humans	Unknown	Binder	Details
Prasterone	Estrogen receptor beta	Protein	Humans	Unknown	Activator	Details

Pharmaco-proteomics

Drug	Drug Groups	Gene	Gene ID	Change	Interaction	Chromosome
Stanolone	Illicit Investigational	KLK3	354	increased	Dihydrotestosterone results in increased expression of KLK3 protein	19q13.33