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Related Experiment Videos

Respiratory pattern modulation by the pedunculopontine tegmental nucleus.

Jasna Saponjic1, Miodrag Radulovacki, David W Carley

  • 1Department of Medicine, Section of Respiratory and Critical Care Medicine, University of Illinois at Chicago, 840 South Wood Street, Chicago, IL 60612-7323, USA.

Respiratory Physiology & Neurobiology
|November 12, 2003
PubMed
Summary

Stimulating the pedunculopontine tegmental nucleus (PPT) alters breathing patterns in rats. Anesthesia type influenced the duration and intensity of these respiratory modulations, impacting the brainstem

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Area of Science:

  • Neuroscience
  • Respiratory Physiology

Background:

  • The pedunculopontine tegmental nucleus (PPT) is not traditionally considered part of the pontine respiratory network.
  • Understanding the role of novel brainstem structures in respiratory control is crucial for respiratory medicine.

Purpose of the Study:

  • To investigate the effect of glutamatergic stimulation of the PPT on respiratory modulation.
  • To compare the influence of ketamine and nembutal anesthesia on PPT-induced respiratory changes.

Main Methods:

  • Microinjection of glutamate into the PPT of Sprague Dawley rats under ketamine or nembutal anesthesia.
  • Monitoring and analysis of respiratory parameters, including breath durations and variability.
  • Observation of respiratory perturbations such as apneas.

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Main Results:

  • Glutamatergic stimulation of the PPT induced long-lasting increases in respiratory parameter variability, including expiratory (TE) and total (TT) breath durations.
  • Respiratory perturbations, including intermittent apneas, were observed following PPT stimulation.
  • The anesthetic agent significantly affected the latency, duration, and structure of the respiratory responses to PPT stimulation, although baseline breathing patterns were similar.

Conclusions:

  • Glutamatergic stimulation of the PPT significantly impacts the brainstem respiratory pattern generator.
  • Anesthetic choice influences the manifestation of PPT-induced respiratory modulation.
  • The PPT plays a role in the complex regulation of spontaneous breathing.