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  • Title: Induction of adrenal tyrosine hydroxylase mRNA by single immobilization stress occurs even after splanchnic transection and in the presence of cholinergic antagonists.
    Author: Kvetnanský R, Nankova B, Hiremagalur B, Viskupic E, Vietor I, Rusnak M, McMahon A, Kopin IJ, Sabban EL.
    Journal: J Neurochem; 1996 Jan; 66(1):138-46. PubMed ID: 8522945.
    Abstract:
    Immobilization (IMO) stress elevates plasma catecholamines and increases tyrosine hydroxylase (TH) gene expression in rat adrenals. This study examined the mechanism(s) of IMO-induced changes in adrenal TH mRNA levels. Innervation of the adrenal medulla is predominantly cholinergic and splanchnicotomy as well as nicotinic receptor antagonists prevent the cold-induced rise in TH mRNA levels. In this study, the IMO-induced rise in plasma catecholamines, but not TH mRNA levels, was reduced by the antagonist chlorisondamine. Muscarinic antagonist atropine also did not prevent the IMO stress-elicited rise in TH mRNA. Furthermore, denervation of the adrenals by unilateral splanchnicotomy did not block the IMO-induced rise in TH mRNA but completely prevented the induction of neuropeptide Y mRNA. These results suggest that (1) the large increase in adrenal TH gene expression elicited by a single IMO stress is not regulated via cholinergic receptors or splanchnic innervation, and (2) there is a dissociation between regulatory mechanisms of catecholamine secretion and elevation of TH gene expression in the adrenal medulla of rats during IMO stress.
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