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| Content Provider | PubMed Central |
|---|---|
| Author | Mankowitz, L. Staffas, L. Bakke, M. Lund, J. |
| Abstract | Three different forms of glutathione transferase (GST) have been resolved in the two mouse adrenal tumour cell lines Y1 and Kin 8. Two of these belong to the mu and pi classes respectively. The third form is so far unidentified. In the Y1 cells, the levels of the mu form (mGTmu1) and the unidentified form, are both down-regulated in the presence of adrenocorticotrophic hormone (ACTH) while the pi form is unaffected. The Kin 8 cell line is derived from Y1 cells and harbours a defect in the cyclic AMP (cAMP)-dependent protein kinase, making it refractory to cAMP-dependent regulation of several enzymes. The GST levels in this cell line were unaffected by ACTH. Also, the steady-state levels of mGTmu1 mRNA were much lower in Y1 cells treated with forskolin (which activates adenylate cyclase) compared with control cells, but there was no difference in mGTmu1 mRNA levels between control and forskolin-treated Kin 8 cells. This indicates that the ACTH-dependent regulation of the mu class GST is pre-translational and that a functional cAMP-dependent protein kinase is required for the regulation. We have further shown that the difference in mRNA steady-state levels between control and forskolin-treated Y1 cells is abolished when transcription is inhibited by actinomycin D. In light of the stability of mGTmu1 mRNA, it would appear most likely that actinomycin D inhibits the transcription of short-lived factors which regulate the turn-over of mGTmu1 transcripts in response to changes in intracellular cAMP levels. |
| Starting Page | 111 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | Pt 1 |
| Volume Number | 305 |
| Language | English |
| Publisher Date | 1995-01-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology Biochemistry |
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