Transcriptional-dependent and Post-transcriptional-dependent Regulation of Glutathione-s-transferase Expression in Rat Hepatocytes As a Function of Culture Conditions
(1992) FEBS Letters — Vol. 313, n° 2, p. 155-159 (1992)
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- Transcriptional activity of the glutathione S-transferase (GST) alpha (subunits 1 and 2), mu (subunits 3 and 4) and pi (subunit 7) gene families has been analyzed using the nuclear 'run-on' technique on adult rat hepatocytes maintained for 4 days in conventional culture and for 4 and 12 days in co-culture with rat liver epithelial cells. Several medium conditions are included in this study, namely with or without fetal calf serum and with nicotinamide or dimethylsulphoxide. Hepatocytes co-cultured for 4 days maintain approximately 30-70% of the alpha gene family transcriptional activity, whatever the medium conditions, when compared to freshly isolated hepatocytes. A marked decrease is observed after 12 days of co-culture or when hepatocytes are maintained in conventional culture. The transcriptional activity of the mu gene family is maintained at 40-160% when hepatocytes are cultured with or without fetal calf serum, and is inducible by nicotinamide (approximately 4-fold) and dimethylsulphoxide (approximately 2-fold) in conventional culture and/or in co-culture. In contrast to freshly isolated hepatocytes, GST pi gene transcriptional activity is observed in conventional and co-cultured hepatocytes, irrespective of the medium conditions. Dimethylsulphoxide treatment however, represses the expression of GST 7 in vitro. These results demonstrate that the expression of GST alpha, mu and pi genes in conventional and co-cultured rat hepatocytes is controlled primarily at the level of transcription. It cannot be excluded, however, that dimethylsulphoxide stabilizes the GST mRNA levels in vitro.
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Vandenberghe, Y., Tee, L., Rogiers, V., & Yeoh, G. (1992). Transcriptional-dependent and Post-transcriptional-dependent Regulation of Glutathione-s-transferase Expression in Rat Hepatocytes As a Function of Culture Conditions. FEBS Letters, 313(2), 155-159. https://doi.org/10.1016/0014-5793(92)81434-N (Original work published 1992)