Intrinsic electrophilicity of the 4-methylsulfonyl-2-pyridone scaffold in glucokinase activators: Role of glutathione-S-transferases and in vivo quantitation of a glutathione conjugate in rats
作者:John Litchfield、Raman Sharma、Karen Atkinson、Kevin J. Filipski、Stephen W. Wright、Jeffrey A. Pfefferkorn、Beijing Tan、Rachel E. Kosa、Benjamin Stevens、Meihua Tu、Amit S. Kalgutkar
DOI:10.1016/j.bmcl.2010.08.095
日期:2010.11
Previous studies on the in vitro metabolism of 4-alkylsulfonyl-2-pyridone-based glucokinase activators revealed a facile, non-enzymatic displacement of the 4-alkylsulfonyl group by glutathione. In the present studies, a role for glutathione-S-transferases (GST) as catalysts in the desulfonylation reaction was demonstrated using a combination of human liver microsomes, human liver cytosol and human GSTs. The identification of a glutathione conjugate in circulation following intravenous administration of a candidate 4-methylsulfonyl-2-pyridone to rats confirmed the relevance of the in vitro findings. (C) 2010 Elsevier Ltd. All rights reserved.