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Related Experiment Videos

Central neuropeptide systems and respiratory control during development.

Immanuela Ravé Moss1, André Laferrière

  • 1Developmental Respiratory Laboratory, The Research Institute of the McGill University Health Centre, The Montreal Children's Hospital, Room A-707, 2300 Tupper Street, Montreal, Que., Canada H3H 1P3. immanuela.moss@muhc.mcgill.ca

Respiratory Physiology & Neurobiology
|July 11, 2002
PubMed
Summary

Developing piglets show reduced respiratory responses to hypoxia. This may be due to substance P/neurotachykinin-1 (NK-1) receptors being endocytosed more than mu-opioid receptors during hypoxia.

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Area of Science:

  • Neuroscience
  • Respiratory Physiology

Background:

  • The substance P/neurotachykinin-1 (NK-1) and mu-opioid receptor systems are crucial for respiratory control in the brainstem.
  • These receptor systems exhibit distinct developmental trajectories.
  • Hypoxia can trigger neuropeptide release, potentially leading to receptor endocytosis and reduced ligand accessibility.

Purpose of the Study:

  • To investigate whether differential endocytosis of NK-1 versus mu-opioid receptors influences the attenuated respiratory response to hypoxia in developing piglets.
  • To compare the short-term and long-term effects of hypoxia on these receptor systems.

Main Methods:

  • Utilized radiolabeled receptors to assess receptor levels in rat brainstem under short-term (5 min) hypoxic conditions.
  • Examined long-term (24 h) receptor responses to recurrent hypoxia in piglet brainstem.

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Main Results:

  • In rats, short-term hypoxia significantly reduced NK-1 receptor levels, suggesting enhanced endocytosis, while mu-opioid receptor levels remained unchanged.
  • In piglets, both NK-1 and mu-opioid receptors showed similar upregulation in response to long-term recurrent hypoxia.
  • This differential short-term response implies a greater relative availability of mu-opioid receptors during hypoxic events in development.

Conclusions:

  • The findings suggest that differential endocytosis of NK-1 and mu-opioid receptors during hypoxia may contribute to the developmental attenuation of respiratory responses.
  • Further confirmation in piglet brainstem is warranted to fully elucidate the mechanisms underlying developmental respiratory plasticity.