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Research ArticleCELLULAR AND MOLECULAR

Chronic Nicotine Treatment Leads to Sustained Stimulation of Tyrosine Hydroxylase Gene Transcription Rate in Rat Adrenal Medulla

Baoyong Sun, Carol R. Sterling and A. William Tank
Journal of Pharmacology and Experimental Therapeutics February 2003, 304 (2) 575-588; DOI: https://doi.org/10.1124/jpet.102.043596
Baoyong Sun
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Carol R. Sterling
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A. William Tank
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Abstract

Nicotine is a powerful stimulant of the sympathoadrenal system, causing the release of peripheral catecholamines and activation of catecholamine biosynthesis. In previous reports, we have studied the mechanisms by which short-term nicotine treatment regulates tyrosine hydroxylase (TH) in adrenal medulla. In this report, we study the effects of chronic nicotine treatment on adrenal TH gene expression. Rats were injected with either saline or nicotine twice per day for up to 14 days. Chronic nicotine treatment elicited long-lasting, dose-dependent increases in the levels of adrenal TH mRNA, TH protein, and TH activity. In contrast, a single injection of nicotine elicited only a small increase in adrenal TH mRNA levels, which was transient and did not result in the induction of TH enzyme. Chronic nicotine administration also elicited a sustained increase in adrenal TH gene transcription rate, which persisted for up to 7 days after the final nicotine injection. This sustained transcriptional response correlated with a modest sustained increase in adrenal TH AP1 binding, but not in the levels of Fra-2 or other fos or jun proteins. These results demonstrate that repeated nicotine injections administered chronically over 1 to 2 weeks lead to sustained stimulation of the TH gene and consequent induction of TH gene expression in rat adrenal medulla. These studies support the hypothesis that chronic nicotine administration produces long-lasting cellular changes in adrenal medulla that lead to sustained transcriptional responses.

Footnotes

  • This work was supported by National Institutes of Health Grants DA05014 and NS39415 and the Smokeless Tobacco Research Council Grant 0481.

  • DOI: 10.1124/jpet.102.043596

  • Abbreviations:
    TH
    tyrosine hydroxylase
    bp
    base pair(s)
    RT-PCR
    reverse transcriptase-polymerase chain reaction
    RT
    reverse transcription
    PCR
    polymerase chain reaction
    EMSA
    electrophoretic mobility shift assay
    TBS-T
    Tris-buffered saline/Triton X-100
    • Received August 24, 2002.
    • Accepted October 28, 2002.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 304 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 304, Issue 2
1 Feb 2003
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Research ArticleCELLULAR AND MOLECULAR

Chronic Nicotine Treatment Leads to Sustained Stimulation of Tyrosine Hydroxylase Gene Transcription Rate in Rat Adrenal Medulla

Baoyong Sun, Carol R. Sterling and A. William Tank
Journal of Pharmacology and Experimental Therapeutics February 1, 2003, 304 (2) 575-588; DOI: https://doi.org/10.1124/jpet.102.043596

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Research ArticleCELLULAR AND MOLECULAR

Chronic Nicotine Treatment Leads to Sustained Stimulation of Tyrosine Hydroxylase Gene Transcription Rate in Rat Adrenal Medulla

Baoyong Sun, Carol R. Sterling and A. William Tank
Journal of Pharmacology and Experimental Therapeutics February 1, 2003, 304 (2) 575-588; DOI: https://doi.org/10.1124/jpet.102.043596
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