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• W1991435125 abstract "The UDP-glucuronosyltransferase UGT1A gene is a major biotransformation gene involved in the metabolism of a vast array of molecules. Recently, we uncovered a new series of alternative spliced isoforms referred to as isoforms 2 or UGT1As_i2 that use an alternative exon 5 (5b). The function of such mRNAs and the corresponding 45 kDa proteins still remains unclear. Although devoid of glucuronosyltransferase activity, UGT1As_i2 are widely co-expressed with the enzymatically active and classical UGT1A isoforms (UGT1As_i1). In this study, we observed abundant signal in human colon tissue samples, predominantly along intestinal crypts. In human cells, UGT1A_i2 proteins are expressed in similar subcellular compartments as UGT1As_i1. Cellular properties of i2-spliced forms were then studied using synthetic small-interfering RNA (siRNA) in two human colon cancer cell lines that show a significant amount of exon 5a- and exon 5b-containing mRNAs and that display enzymatic activities for UGT1As substrates. We observed that siRNA-mediated knockdown of endogenous i2 upregulates cellular glucuronidation activities by 120–170% (P<0.01) for all substrates tested. Functional data support a dominant-negative function for endogenous exon 5b-spliced forms of UGT1A, hence potentially affecting in vivo glucuronidation capacity. This new regulatory strategy may ensure an additional mean to modulate cellular response to endo/xeno stimulus." @default.
• W1991435125 created "2016-06-24" @default.
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• W1991435125 date "2009-12-08" @default.
• W1991435125 modified "2023-10-17" @default.
• W1991435125 title "Alternative-splicing forms of the major phase II conjugating UGT1A gene negatively regulate glucuronidation in human carcinoma cell lines" @default.
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• W1991435125 doi "https://doi.org/10.1038/tpj.2009.64" @default.
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