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Related Experiment Videos

Comparative aspects of central CO2 chemoreception

J S Erlichman1, J C Leiter

  • 1Department of Physiology, Dartmouth Medical School, Lebanon, NH 03756, USA.

Respiration Physiology
|January 4, 1998
PubMed
Summary
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Carbon dioxide (CO2) chemoreceptor mechanisms in air-breathing vertebrates and snails show striking similarities. Both utilize intracellular pH (pHi) regulation and alphastat ventilation control, despite different evolutionary paths.

Area of Science:

  • Comparative physiology
  • Neuroscience
  • Respiratory regulation

Background:

  • Carbon dioxide (CO2) is a critical regulator of respiration.
  • Chemoreceptors detect CO2 levels, influencing breathing rate.
  • Intracellular pH (pHi) plays a key role in CO2 sensing.

Purpose of the Study:

  • To compare CO2 chemoreceptor mechanisms in air-breathing vertebrates and terrestrial pulmonate snails.
  • To investigate the role of intracellular pH (pHi) in respiratory responses to CO2.
  • To explore similarities and differences in chemosensory neuronal function.

Main Methods:

  • Comparative analysis of CO2 chemoreceptor function.
  • Examination of intracellular pH (pHi) regulation patterns.
  • Assessment of alphastat regulation of ventilation.

Related Experiment Videos

  • Use of diethyl pyrocarbonate to inhibit hypercapnic responses.
  • Investigation of the ionic basis of chemosensitivity.

    • Main Results:

    • Similarities in CO2 chemosensory responses and mechanisms observed between vertebrates and snails.
    • Alphastat regulation of ventilation is present in both groups.
    • Diethyl pyrocarbonate inhibits hypercapnic responses in both.
    • Neuronal depolarization occurs in chemoreceptor cells during hypercapnia.
    • Vertebrates show potassium conductance, while snails exhibit calcium conductance in excitability.

    Conclusions:

    • Convergent evolution has led to similar CO2 chemosensory mechanisms in distantly related species.
    • Intracellular pH (pHi) regulation is a conserved mechanism for CO2 sensing.
    • Despite divergent evolutionary histories, functional similarities in chemoreception are remarkable.