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Cellular and Molecular Neurobiology

, Volume 4, Issue 1, pp 79–90 | Cite as

Effects of various kinds of stimulation on ornithine decarboxylase activity in superior cervical sympathetic and nodose ganglia of rats

  • Masato Ando
  • Masato Miwa
  • Yutaka Nagata
Article

Summary

  1. 1.

    Levels of cyclic nucleotides and ornithine decarboxylase (ODC) activity were examined following the application of various kinds of stimuli to superior cervical sympathetic ganglia (SCG), nodose ganglia, and vagus nerve fibers excised from the rat.

     
  2. 2.

    The level of cyclic GMP in the SCG rose rapidly to about 4.5- to 7.5-fold the unstimulated control with 10 min of incubation after applications of preganglionic electrical stimulation (10 Hz), acetylcholine (ACh; 1 mM), or high extracellular K+ ([K+]0, 70 mM). The cyclic GMP level in nodose ganglia was increased less than in the SCG by either ACh or high [K+]0 but was not affected by ACh in vagus fibers. Cyclic AMP in the SCG was also increased about 4- to 5.5-fold over the control within 10 min with the addition of ACh, norepinephrine (NE; 0.05 mM), or high [K+]0. Although NE caused a small increase in cyclic AMP, neither ACh nor high [K+]0 produced any appreciable change in nodose ganglia or vagus fibers.

     
  3. 3.

    The ODC activity in the SCG was increased by preganglionic stimulation of 3-to 4-hr duration but not by a shorter period. A similar change in ODC activity was caused by the addition of oxotremorine (1 mM), isoproterenol (0.1 mM), NE, cyclic AMP (1 mM), or dibutyryl cyclic GMP (1 mM). The effect was exaggerated by the further addition of 3-isobutyl-1-methylxanthine (IBMX), a phosphodiesterase inhibitor.

     
  4. 4.

    The increase in ODC activity caused by ACh was abolished by a muscarinic cholinergic antagonist, atropine (0.01 mM), and following axotomy for a week, but not by a nicotinic antagonist or by denervation in the SCG. A similar increase in ganglionic ODC activity by NE was inhibited by an adrenergic blocker, propranolol (0.01 mM), and following axtotomy for a week, but not by denervation.

     
  5. 5.

    Cholinergic or adrenergic stimulation did not cause an increase in ODC activity in nodose ganglia or vagus fibers.

     
  6. 6.

    These results suggest that the stimulation-induced increase in ODC activity occurs in postganglionic neurons rather than in satellite glial cells and is mediated by muscarinic cholinergic or adrenergic receptors. The process appears to involve cyclic nucleotide-mediated protein biosynthesis in the SCG.

     

Key words

preganglionic stimulation acetylcholine norepinephrine cyclic GMP cyclic AMP ornithine decarboxylase superior cervical ganglia nodose ganglia vagus fibers denervation axotomy 

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Copyright information

© Plenum Publishing Corporation 1984

Authors and Affiliations

  • Masato Ando
    • 1
  • Masato Miwa
    • 1
  • Yutaka Nagata
    • 1
  1. 1.Department of PhysiologySchool of Medicine, Fujita-Gakuen UniversityToyoake, AichiJapan

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