Penning Trevor M, Byrns Michael C
Center of Excellence in Environmental Toxicology, Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6084, USA.
Ann N Y Acad Sci. 2009 Feb;1155:33-42. doi: 10.1111/j.1749-6632.2009.03700.x.
Prostate and breast cancer are hormone-dependent malignancies of the aging male and female and require the local production of androgens and estrogens to stimulate cell proliferation. Aldo-keto reductases (AKR) play key roles in this process. In the prostate, AKR1C3 (type 5 17beta-HSD) reduces Delta(4)-androstene-3,17-dione to yield testosterone while AKR1C2 (type 3 3alpha-HSD) eliminates 5alpha-dihydrotestosterone (5alpha-DHT), and AKR1C1 forms 3beta-androstanediol (a ligand for ERbeta). In the breast, AKR1C3 forms testosterone, which is converted to 17beta-estradiol by aromatase or reduces estrone to 17beta-estradiol directly. AKR1C3 also acts as a prostaglandin (PG) F synthase and forms PGF(2alpha) and 11beta-PGF(2alpha), which stimulate the FP receptor and prevent the activation of PPARgamma by PGJ(2) ligands. This proproliferative signaling may stimulate the growth of hormone-dependent and -independent prostate and breast cancer.
前列腺癌和乳腺癌是老年男性和女性的激素依赖性恶性肿瘤,需要局部产生雄激素和雌激素来刺激细胞增殖。醛酮还原酶(AKR)在这一过程中起关键作用。在前列腺中,AKR1C3(5型17β-羟基类固醇脱氢酶)将Δ4-雄烯-3,17-二酮还原生成睾酮,而AKR1C2(3型3α-羟基类固醇脱氢酶)消除5α-二氢睾酮(5α-DHT),AKR1C1形成3β-雄烷二醇(雌激素受体β的一种配体)。在乳腺中,AKR1C3生成睾酮,睾酮可通过芳香化酶转化为17β-雌二醇,或直接将雌酮还原为17β-雌二醇。AKR1C3还作为前列腺素(PG)F合酶,形成PGF2α和11β-PGF(2α),它们刺激FP受体并阻止PGJ2配体激活过氧化物酶体增殖物激活受体γ(PPARγ)。这种促增殖信号可能刺激激素依赖性和非依赖性前列腺癌和乳腺癌的生长。