Evaluation of nicotinic receptor of pedunculopontine tegmental nucleus in central cardiovascular regulation in anesthetized rat

Authors

  • Mahmoud Hosseini Division of Neurocognitive Sciences, Psychiatry and Behavioral Sciences Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
  • Mohammad Naser Shafei Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
  • Saeed Niazmand Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran|Division of Neurocognitive Sciences, Psychiatry and Behavioral Sciences Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
  • Tahereh Nikyar Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Abstract:

Objective(s): Cholinergic neurons are important neurons in the Pedunculopontine tegmental nucleus (PPT). In this study, nicotinic receptor of the PPT in central cardiovascular regulation in the anesthetized rat was evaluated. Materials and Methods: Saline, acetylcholine (Ach; doses: 90 and 150 nmol), hexamethonium (Hexa; doses: 100 and 300 nmol) and higher doses of Hexa (300 nmol) + Ach (150 nmol) microinjected into the PPT. The femoral artery was cannulated and cardiovascular responses were continuously recorded by a power lab system. After injection of drugs, peak changes of mean arterial pressure (∆MAP), systolic blood pressure (∆SBP) and heart rate (∆HR) calculated and compared with saline group.Results: The ∆SBP and ∆MAP significantly decreased by two doses of Ach (PConclusion: These results indicate that nicotinic receptor of the PPT has an inhibitory effect on ∆HR with no significant effect on ∆MAP or ∆SBP.

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Journal title

volume 21  issue 4

pages  376- 381

publication date 2018-04-01

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