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Related Experiment Videos

Hyperbaric oxygenation alters carotid body ultrastructure and function

D Torbati1, A K Sherpa, S Lahiri

  • 1Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia.

Respiration Physiology
|May 1, 1993
PubMed
Summary

Hyperbaric oxygenation (HBO) rapidly reduces the carotid body's sensitivity to low oxygen levels in cats. This effect is linked to changes in mitochondria, not neurotransmitter availability.

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Area of Science:

  • Physiology
  • Cell Biology
  • Neuroscience

Background:

  • Previous studies showed chronic normobaric hyperoxia (NH) impairs carotid chemosensory response, likely via reactive oxygen species (ROS).
  • Oxygen's effects are dose-dependent, suggesting shorter, intense exposures like hyperbaric oxygenation (HBO) may have distinct cellular impacts.

Purpose of the Study:

  • To investigate the rapid effects of HBO on carotid body cellular mechanisms and chemosensory responses.
  • To determine if HBO alters chemoreception to hypoxia, hypercapnia, or chemical stimuli.

Main Methods:

  • Cats were exposed to hyperbaric oxygen (HBO) at 5 atmospheres absolute (ATA) for approximately 2 hours.
  • Carotid body ultrastructure was analyzed using electron microscopy and morphometry.
  • Chemosensory responses to hypoxia, hypercapnia, cyanide, nicotine, and dopamine were measured.

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Main Results:

  • HBO significantly diminished the carotid body's chemosensory responsiveness to hypoxia within 2 hours.
  • Responses to hypercapnia, cyanide, nicotine, and dopamine remained unaffected by HBO.
  • HBO increased mitochondrial volume-density and decreased mitochondrial cristae area in glomus cells.

Conclusions:

  • Rapid HBO exposure attenuates hypoxic chemosensation, supporting a dose-dependent oxygen effect.
  • Changes in mitochondrial structure, not neurotransmitter vesicle distribution, correlate with blunted hypoxic sensitivity.
  • Findings suggest a link between cellular oxidative metabolism and oxygen chemoreception mechanisms.