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• W2031775425 abstract "Aldo-keto reductase (AKR) 1C3 catalyzes the NADPH-dependent reduction of Δ4-androstene-3,17-dione to yield testosterone, reduction of estrone to yield 17β-estradiol and reduction of progesterone to yield 20α-hydroxyprogesterone. In addition, it functions as a prostaglandin (PG) F synthase and reduces PGH2 to PGF2α and PGD2 to 11β-PGF2. Immunohistochemistry showed that AKR1C3 is over-expressed in invasive ductal carcinoma of the breast. Retroviral expression of AKR1C3 in MCF-7 breast carcinoma cells shows that each of the assigned reactions occur in a breast cell microenvironment. Steroid and prostaglandin conversions were monitored by radiochromatography. Prostaglandin conversion was validated by a second method using HPLC coupled to APCI-MRM/MS. The combined effect of the AKR1C3 catalyzed 17- and 20-ketosteroid reductions will be to increase the 17β-estradiol:progesterone ratio in the breast. In addition, formation of PGF2 epimers would activate F prostanoid receptors and deprive PPARγ of its putative anti-proliferative PGJ2 ligands. Thus, AKR1C3 is a source of proliferative signals and a potential therapeutic target for hormone-dependent and -independent breast cancer. Two strategies for AKR1C3 inhibition based on non-steroidal anti-inflammatory drugs were developed. The first strategy uses the Ullmann coupling reaction to generate N-phenylanthranilate derivatives that inhibit AKR1C enzymes without affecting PGH2 synthase (PGHS) 1 or PGHS-2. The second strategy exploits the selective inhibition of AKR1C3 by indomethacin, which did not inhibit highly related AKR1C1 or AKR1C2. Using known structure–activity relationships for the inhibition of PGHS-1 and PGHS-2 by indole acetic acids we obtained N-(4-chlorobenzoyl)-melatonin as a specific AKR1C3 inhibitor (KI = 6.0 μM) that does not inhibit PGHS-1, PGHS-2, AKR1C1, or AKR1C2. Both strategies are informed by crystal structures of ternary AKR1C3·NADP+·NSAID complexes. The identification of NSAID analogs as specific inhibitors of AKR1C3 will help validate its role in the proliferation of breast cancer cells." @default.
• W2031775425 created "2016-06-24" @default.
• W2031775425 creator A5059737908 @default.
• W2031775425 creator A5061938264 @default.
• W2031775425 date "2009-03-01" @default.
• W2031775425 modified "2023-10-18" @default.
• W2031775425 title "Type 5 17β-hydroxysteroid dehydrogenase/prostaglandin F synthase (AKR1C3): Role in breast cancer and inhibition by non-steroidal anti-inflammatory drug analogs" @default.
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• W2031775425 doi "https://doi.org/10.1016/j.cbi.2008.10.024" @default.
• W2031775425 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3076957" @default.
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