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- W2064130135 abstract "The cytosolic GSTs were measured directly in tissue homogenates using HPLC interfaced via ESI to a mass spectrometer (LC/MS). Total ion chromatograms were generated and filtered for ion currents corresponding to m/z ratio characteristic of individual GST isozymes. Direct LC/MS has a high degree of precision (8%) and low instrument detection limits (50-100 ng) and offers the advantage of monitoring GST expression at the protein level. In this study we describe the sub-chronic effect of feeding flavone (2500 mg/kg diet) on the expression of mGSTA3, mGSTP1, mGSTM1, and mGSTM2 in male and female mice. Additionally, we tentatively identify mGSTO and its up-regulation by flavone; a result that will facilitate the study of this novel enzyme. Flavone induced mGSTM1 and mGSTP1 in a gender and isozyme specific manner yet had no appreciable effect on the expression of mGSTA3. Male animals (day 5) displayed a 8-fold increase in mGSTM1 and a 2.6-fold increase in mGSTP1 whereas female animals displayed a 5- and 3-fold increase in mGSTM1 and mGSTP1, respectively. The mGSTM2 was detected only in flavone-fed animals, indicating an up-regulation of this isozyme by flavone. Results obtained using direct LC/MS compare favorably to the specific activity of individual isozymes (P = 0.19), and are comparable to GST levels determined using affinity chromatography followed by LC/MS (P = 0.79)." @default.
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- W2064130135 date "2004-10-01" @default.
- W2064130135 modified "2023-10-16" @default.
- W2064130135 title "Direct liquid chromatography–mass spectrometry method for the detection of glutathione S-transferase isozymes and investigation of their expression in response to dietary flavone" @default.
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- W2064130135 doi "https://doi.org/10.1016/j.jchromb.2004.07.004" @default.
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