Abstract
It is being increasingly recognized that nitric oxide (NO) is associated with many physiological processes, including regulation of gene expression. NO shares certain similarities with molecular oxygen (O2) Previous studies have shown that hypoxia up-regulates c-fos, an immediate early gene, and tyrosine hydroxylase (TH), a late response gene that encodes rate limiting enzyme in catecholamine synthesis. Given the similarities between NO and O2, we hypothesized that NO inhibits hypoxia-induced up-regulation of c-fos and TH. Experiments were performed on rat pheochromocytoma (PC 12) cells, c-fos and TH mRNA’s were analysed by Northern blot and promoter activities by reporter gene assays, respectively. Hypoxia (1%O2 for 6 h) up-regulated c-fos and TH mRNAs and increased c-fos promoter activity. Hypoxia-induced c-fos mRNA expression, and promoter activities were significantly potentiated in presence of spermine nitric oxide (SNO), a NO donor. By contrast, SNO significantly inhibited TH mRNA expression and TH promoter activity during hypoxia. Electrophoretic mobility shift-assay showed increased binding of AP-1 and HIF-1 transcription factors to the TH promoter in cells exposed to hypoxia. SNO abolished the binding of AP- 1 and HIF- 1 to the TH promoter during hypoxia, suggesting that inhibition of hypoxia-induced TH transcription by NO are due to reduced binding of AP- 1 and HIF- 1 transcription factors. These result demonstrate that NO has both positive and negative influence on gene regulation by hypoxia and suggest that although NO resembles O2 does not always inhibit gene expression during low oxygen.
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© 2002 Kluwer Academic Publishers
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Adhikary, G., Premkumar, D.R.D., Prabhakar, N.R. (2002). Dual Influence of Nitric Oxide on Gene Regulation During Hyoixua. In: Lahiri, S., Prabhakar, N.R., Forster, R.E. (eds) Oxygen Sensing. Advances in Experimental Medicine and Biology, vol 475. Springer, Boston, MA. https://doi.org/10.1007/0-306-46825-5_27
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DOI: https://doi.org/10.1007/0-306-46825-5_27
Publisher Name: Springer, Boston, MA
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