TY - JOUR
T1 - Design, synthesis, and in vitro testing of α-methylacyl-CoA racemase inhibitors
AU - Carnell, Andrew J.
AU - Hale, Ian
AU - Denis, Simone
AU - Wanders, Ronald J.A.
AU - Isaacs, William B.
AU - Wilson, Brice A.
AU - Ferdinandusse, Sacha
PY - 2007/5/31
Y1 - 2007/5/31
N2 - The enzyme α-methylacyl-CoA racemase (AMACR) is overexpressed in prostate, colon, and other cancers and has been partially validated as a potential therapeutic target by siRNA knockdown of the AMACR gene. Analogs of the natural substrate branched chain α-methylacyl coenzyme A esters, possessing one or more β-fluorine atoms, have been synthesized using Wittig, conjugate addition, and asymmetric aldol reactions and found to be reversible competitive inhibitors. Each diastereomer of the previously reported inhibitor ibuprofenoyl-CoA was also tested. The compounds had Ki values of 0.9-20 μM and are the most potent inhibitors yet known. The presence of β-fluorine on the α-methyl group or the acyl chain results in a significant lowering of the Ki value compared with nonfluorinated analogs, and this is attributed to a lowering of the pK a of the α-proton, facilitating enolization and binding. Several of the CoA ester inhibitors were formed by incubating the free carboxylic acid precursors with cell free extracts and CoA. α- Trifluoromethyltetradecanoic acid, the precursor to the most potent inhibitor, was shown to inhibit growth of cancer cell lines PC3, CWR22 Rv1, and Du145 in a dose-dependent manner and could be related to the expression level of AMACR.
AB - The enzyme α-methylacyl-CoA racemase (AMACR) is overexpressed in prostate, colon, and other cancers and has been partially validated as a potential therapeutic target by siRNA knockdown of the AMACR gene. Analogs of the natural substrate branched chain α-methylacyl coenzyme A esters, possessing one or more β-fluorine atoms, have been synthesized using Wittig, conjugate addition, and asymmetric aldol reactions and found to be reversible competitive inhibitors. Each diastereomer of the previously reported inhibitor ibuprofenoyl-CoA was also tested. The compounds had Ki values of 0.9-20 μM and are the most potent inhibitors yet known. The presence of β-fluorine on the α-methyl group or the acyl chain results in a significant lowering of the Ki value compared with nonfluorinated analogs, and this is attributed to a lowering of the pK a of the α-proton, facilitating enolization and binding. Several of the CoA ester inhibitors were formed by incubating the free carboxylic acid precursors with cell free extracts and CoA. α- Trifluoromethyltetradecanoic acid, the precursor to the most potent inhibitor, was shown to inhibit growth of cancer cell lines PC3, CWR22 Rv1, and Du145 in a dose-dependent manner and could be related to the expression level of AMACR.
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U2 - 10.1021/jm0702377
DO - 10.1021/jm0702377
M3 - Article
C2 - 17477519
AN - SCOPUS:34250197150
SN - 0022-2623
VL - 50
SP - 2700
EP - 2707
JO - Journal of medicinal chemistry
JF - Journal of medicinal chemistry
IS - 11
ER -