An endocrine pathway in the prostate, ERβ, AR, 5α-androstane-3β,17β-diol, and... - 0 views
www.pnas.org/...13589.full
3-beta androstanediol DHT metabolite prostate cancer ER-beta ER beta CYP7b1 cytochrome male hormone hormones men
shared by Nathan Goodyear on 27 Jan 14
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Although the prostate is an androgen-dependent tissue, estrogens influence both normal functions and pathological changes in this gland
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In this study we have shown that regulation of the levels of 3βAdiol by CYP7B1 is a key factor in regulation of prostatic growth
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We provide evidence that proliferating cells in the prostate epithelium have elevated levels of AR and that AR protein but not mRNA levels are regulated by ERβ and its ligand 3βAdiol in the prostate epithelium.
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because inhibition of 5α-reductase causes accumulation of testosterone and removal of ERβ action increases the level of AR in the prostate, the overall effect of Finasteride would be to favor proliferation of the prostate epithelium
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DHEA is converted in the body to 5-androstene-3β,17β-diol, which is also a ligand for estrogen receptors (25, 39) and a substrate for CYP7B1
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At the peak of proliferation, the proliferating epithelial cells in the ventral prostate expressed high levels of CYP7B1 but had no detectable ERβ, whereas in nonproliferating cells the level of ERβ was high and that of CYP7B1 was low.
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3-beta androstanediola, a product of 3alpha-HSD from DHT binds to ER beta and down regulates AR in prostate cancer. This study proposes that the mechanism is via CYP7B1. CYP7B1 inactivates 3-beta androstanediol. Interesting, because 3-beta androstanediol is considered "inactive" when compared to 3-alpha androstanediol and its interaction with ER alpha.