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Research ArticleNEUROPHARMACOLOGY

Adrenal Tyrosine Hydroxylase Activity and Gene Expression Are Increased by Intraventricular Administration of Nicotine

Carol R. Sterling and A. William Tank
Journal of Pharmacology and Experimental Therapeutics January 2001, 296 (1) 15-21;
Carol R. Sterling
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A. William Tank
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Abstract

When nicotine is administered s.c. to rats, tyrosine hydroxylase (TH) enzyme activity and TH gene transcription rate are activated, and TH mRNA and TH protein are induced in adrenal medulla. In this report we test whether nicotine elicits these responses via trans-synaptic mechanisms initiated by the actions of the drug in the brain. Our results demonstrate that intraventricular (i.v.t.) administration of nicotine produces a dose-dependent activation of adrenal TH, which is blocked by i.v.t. administration of hexamethonium, but not by i.p. administration of this nicotinic acetylcholine receptor antagonist. We also show that surgical transection of the splanchnic nerve blocks the activation of adrenal TH by i.v.t.-administered nicotine. Repeated i.v.t. administration of nicotine over a 3-h period (injections spaced 30 min apart) leads to a sustained activation of adrenal TH, suggesting that this central response to nicotine does not readily desensitize. Intraventricular administration of nicotine also stimulates the TH gene transcription rate in rat adrenal medulla. When administered repeatedly i.v.t. or s.c. over 3 h, nicotine induces adrenal TH mRNA. This induction is dependent on innervation of the adrenal medulla, even when the drug is injected s.c. Our results demonstrate that the central effects of nicotine are sufficient to activate TH and induce TH gene expression in rat adrenal medulla. Furthermore, our results suggest that this centrally mediated response to nicotine is essential for the induction of adrenal TH mRNA.

Footnotes

  • Send reprint requests to: A. William Tank, Ph.D., Department of Pharmacology and Physiology, Box 711, University of Rochester Medical Center, 601 Elmwood Ave., Rochester, NY 14642. E-mail: awilliam_tank{at}urmc.rochester.edu

  • This work was supported by National Institute on Drug Abuse Grant 05014 and Smokeless Tobacco Research Council Grant 0481.

  • Abbreviations:
    nAChR
    nicotinic acetylcholine receptor
    TH
    tyrosine hydroxylase
    i.v.t.
    intraventricular
    • Received June 14, 2000.
    • Accepted September 5, 2000.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 296 (1)
Journal of Pharmacology and Experimental Therapeutics
Vol. 296, Issue 1
1 Jan 2001
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Research ArticleNEUROPHARMACOLOGY

Adrenal Tyrosine Hydroxylase Activity and Gene Expression Are Increased by Intraventricular Administration of Nicotine

Carol R. Sterling and A. William Tank
Journal of Pharmacology and Experimental Therapeutics January 1, 2001, 296 (1) 15-21;

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Research ArticleNEUROPHARMACOLOGY

Adrenal Tyrosine Hydroxylase Activity and Gene Expression Are Increased by Intraventricular Administration of Nicotine

Carol R. Sterling and A. William Tank
Journal of Pharmacology and Experimental Therapeutics January 1, 2001, 296 (1) 15-21;
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