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| Content Provider | PubMed Central |
|---|---|
| Author | Vyas, S. Biguet, N. Faucon Mallet, J. |
| Abstract | The role played by protein kinase C (PKC) in TH gene regulation was investigated at transcriptional and post-transcriptional levels using PC12 cells. The cells were treated with the phorbol ester TPA, which not only activates PKC but also causes down-regulation. PKC levels were monitored by [3H]PDBU binding assay and by using an anti-PKC antibody that detected intact PKC (79 kd) as well as its catalytic and regulatory domains. The [3H]PDBU binding to the membrane-associated PKC increased within 15-30 min of TPA treatment; thereafter total cellular [3H]PDBU binding decreased to a minimum of 20% of the control at 8 h. The rate of decrease in binding was greater than the decrease in the intensity of the staining of PKC holo enzyme visualized by anti-PKC antibody. TH mRNA levels, measured over the same time period, rose within 15 min of TPA treatment to peak at 4 h and subsequently declined below control level, paralleling the depletion of PKC. If cells depleted of PKC were reincubated in the normal medium, a recovery in PKC level was seen and, in parallel, TH mRNA levels increased to above control level. Furthermore, if down-regulation of PKC was prevented by incubating the cells with the protease inhibitor leupeptin, a decrease beyond control level in TH mRNA was not observed. TPA rapidly induced TH gene transcription; a maximal increase of two-fold was observed at 15 min, but the transcriptional rate then declined although it did not decrease beyond control values after 8 and 24 h of TPA treatment.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Starting Page | 3707 |
| File Format | |
| ISSN | 14602075 |
| e-ISSN | 14602075 |
| Journal | The EMBO Journal |
| Issue Number | 11 |
| Volume Number | 9 |
| Language | English |
| Publisher Date | 1990-11-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Neuroscience Immunology and Microbiology Medicine Molecular Biology |
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