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Developmental plasticity of the hypoxic ventilatory response

L Ling1, E B Olson, E H Vidruk

  • 1Department of Comparative Biosciences, University of Wisconsin, Madison 53706, USA. linglimi@macc.wisc.edu

Respiration Physiology
|January 4, 1998
PubMed
Summary

Developmental plasticity affects the hypoxic ventilatory control system. Perinatal oxygen exposure impairs carotid chemoreceptors, reducing hypoxic responses in adult rats, with potential implications for neonatal intensive care.

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Area of Science:

  • Physiology
  • Neuroscience
  • Developmental Biology

Background:

  • The hypoxic ventilatory control system exhibits developmental plasticity.
  • Perinatal sensory suppression can lead to long-term functional impairments.
  • Understanding these effects is crucial for neonatal care.

Purpose of the Study:

  • To investigate developmental plasticity in the hypoxic ventilatory control system.
  • To identify the functional impairment following perinatal sensory suppression.
  • To explore the clinical implications of altered hypoxic responses in neonates.

Main Methods:

  • Rats were exposed to hyperoxia (60% O2) during the first month of life to suppress peripheral arterial chemoreceptor activity.
  • Ventilatory responses to hypoxia and hypercapnia were measured in adult rats (2-5 months post-exposure).

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  • Potential causes including pulmonary mechanics, gas exchange, and central integration were assessed.

    • Main Results:

    • Perinatal hyperoxia exposure resulted in severely attenuated hypoxic ventilatory responses in adult rats.
    • This effect was specific to developmental exposure, not seen in adult hyperoxia-exposed rats.
    • Carotid chemoreceptor chemotransduction was persistently impaired, ruling out other factors.

    Conclusions:

    • The hypoxic ventilatory response is susceptible to developmental plasticity.
    • A primary deficit in carotid chemoreceptor function underlies the observed impairment.
    • Findings highlight risks of excessive oxygen therapy in neonatal intensive care.