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• W2083345191 abstract "Abstract We have previously shown that the phorbol ester, TPA, which activates protein kinase C, causes, in PC12 cells, a transcriptional activation of tyrosine hydroxylase (TH), the key enzyme in catecholamine synthesis. The study has now been extended to examine the processes that underlie this transcriptional stimulation and, in addition, to seek whether similar mechanisms are involved in long‐term trans‐synaptic induction of the TH gene in adrenal medullae of rats that have been given a single injection of reserpine. In both systems, it was found that the induction of c‐ fos gene transcription was associated with that of the TH gene but with different kinetics. The promoter of the TH gene contains (at position −207/–200) a sequence (TGATTCA) which differs from the consensus TRE or AP‐1 site (TGACTCA) by one nucleotide. Experiments were carried out to investigate whether the AP‐1 protein complex which is known to contain Fos and Jun binds to the putative TRE region of the TH promoter. In the gel shift assays, the nuclear protein extracts derived from TPA‐treated PC12 cells and from AM of reserpine injected rats displayed a higher magnitude of binding to a 25‐mer TRE‐TH oligonucleotide as compared to controls. The results showed that the behaviour of TRE‐TH was atypical in that two retarded complexes (A and B) were observed, which were displaced by specific competitors. Trans‐activation experiments with plasmids TRE‐TH/TK/CAT and −754/–19 TH/pUC18‐CAT in PC12 cells showed an increase in CAT activity in response to TPA that correlates with the previously observed increase in TH transcriptional activity by TPA. Co‐transfection with plasmids BK28 containing c‐ fos and/or with pSV‐c‐ jun resulted in a significant increase in CAT activity showing a functional interaction of these proteins with TRE‐TH. Our findings indicate that the TRE‐TH site plays a critical role in trans‐synaptic regulation of the TH gene. © 1992 Wiley‐Liss, Inc." @default.
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• W2083345191 date "1992-06-01" @default.
• W2083345191 modified "2023-10-16" @default.
• W2083345191 title "AP-1 complex and c-fos transcription are involved in TPA provoked and trans-synaptic inductions of the tyrosine hydroxylase gene: Insights into long-term regulatory mechanisms" @default.
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• W2083345191 doi "https://doi.org/10.1002/jnr.490320219" @default.
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