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Mild carbon monoxide exposure and auditory function in the developing rat.

Janet E Stockard-Sullivan1, Rose A Korsak, Douglas S Webber

  • 1Mental Retardation Research Center, The David Geffen School of Medicine, UCLA, Los Angeles, California 90095, USA.

Journal of Neuroscience Research
|November 25, 2003
PubMed
Summary
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Chronic mild carbon monoxide (CO) exposure harms developing rat auditory function, specifically the eighth cranial nerve, even at low levels. Learning abilities remained unaffected by CO exposure in young rats.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Toxicology

Background:

  • Developing brains are vulnerable to environmental toxins.
  • Carbon monoxide (CO) is a known neurotoxin, but its effects on developing auditory and cognitive functions require further investigation.

Purpose of the Study:

  • To investigate the impact of chronic mild carbon monoxide (CO) exposure on the developing auditory and cognitive functions in rat pups.
  • To determine the threshold for CO-induced auditory pathway compromise during critical developmental periods.

Main Methods:

  • Artificially reared rat pups were exposed to varying concentrations of CO (12-100 ppm) during brain development.
  • Auditory function was assessed using auditory brainstem response, eighth nerve action potential amplitude, and otoacoustic emissions.

Related Experiment Videos

  • Spatial learning was evaluated using the Morris Water Maze.

    • Main Results:

    • Auditory pathway compromise was observed at CO concentrations of 50 ppm, evidenced by altered otoacoustic emissions and significant attenuation of the eighth nerve's action potential amplitude.
    • Eighth nerve action potential deficits persisted even after CO exposure ceased.
    • No significant impact on spatial learning was detected at CO exposures up to 100 ppm.

    Conclusions:

    • Prolonged mild carbon monoxide exposure during development induces measurable functional deficits in the auditory system, particularly affecting the eighth cranial nerve.
    • The auditory pathway is more sensitive to CO toxicity than cognitive functions during early development.
    • These findings highlight the potential risks of low-level CO exposure to auditory development.