Central cholinergic modulation of the exercise pressor reflex in anesthetized cats

A. Ally, A. F. Meintjes, J. H. Mitchell, L. B. Wilson

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Effects of central administration of a cholinesterase inhibitor, physostigmine, on cardiovascular responses to static contraction and passive stretch of the triceps surae were studied using anesthetized cats. Contraction increased mean arterial pressure (MAP), heart rate (HR), and renal sympathetic nerve activity (RSNA) by 44 ± 5 mmHg, 18 ± 1 beats/min, and 86 ± 6%, respectively. MAP, HR, and RSNA increased during stretch by 44 ± 5 mmHg, 15 ± 1 beats/min, and 61 ± 4%, respectively. Administration of physostigmine (100 μg; 5 μl) into the third ventricle decreased resting MAP by 22 ± 3 mmHg and RSNA by 32 ± 4%, with no effect on HR. Physostigmine attenuated the contraction-evoked responses as MAP, HR, and RSNA increased by 17 ± 2 mmHg, 3 ± 1 beats/min, and 31 ± 6%, respectively. Also, physostigmine blunted MAP, HR, and RSNA responses to stretch (16 ± 2 mmHg, 4 ± 1 beats/min, and 9 ± 6%, respectively). Posterior hypothalamic stimulation increased MAP by 39 ± 3 mmHg, which was unaffected by physostigmine, despite a lower baseline. Cardiovascular and RSNA responses to contraction and stretch returned to control 90-120 min after physostigmine. Preadministration of the muscarinic antagonist, atropine sulfate (100 μg; 5 μl), blocked the effects of physostigmine. Results suggest central cholinergic stimulation can inhibit the exercise pressor reflex in anesthetized cats.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume267
Issue number1 36-1
StatePublished - 1994

Fingerprint

physostigmine
Physostigmine
cholinergic agents
reflexes
Cholinergic Agents
Reflex
exercise
Cats
Arterial Pressure
nerve tissue
cats
kidneys
heart rate
Kidney
Heart Rate
cholinesterase inhibitors
Third Ventricle
Muscarinic Antagonists
Cholinesterase Inhibitors
atropine

Keywords

  • atropine
  • intracerebroventricular
  • muscarinic receptors
  • physostigmine
  • sympathetic nerve activity
  • ventrolateral medulla

ASJC Scopus subject areas

  • Physiology
  • Agricultural and Biological Sciences(all)

Cite this

Central cholinergic modulation of the exercise pressor reflex in anesthetized cats. / Ally, A.; Meintjes, A. F.; Mitchell, J. H.; Wilson, L. B.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 267, No. 1 36-1, 1994.

Research output: Contribution to journalArticle

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