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Updated: Aug 14, 2026
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Auditory Brainstem Response and Outer Hair Cell Whole-cell Patch Clamp Recording in Postnatal Rats
Published on: May 24, 2018
Auditory deficits in rats exposed to an environmental PCB mixture during development
Brian E Powers1, John J Widholm, Robert E Lasky
1Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61802, USA.
Summary
Developmental exposure to polychlorinated biphenyls (PCBs) can cause hearing loss in rats. This study confirms PCBs impair cochlear function and auditory pathways, suggesting potential human risks.
Area of Science:
- Environmental Toxicology
- Neuroscience
- Auditory Science
Background:
- Previous research suggests developmental exposure to polychlorinated biphenyls (PCBs) may lead to hearing impairment.
- The cochlea is implicated as the primary site of action for PCB ototoxicity.
Purpose of the Study:
- To investigate the ototoxic effects of a specific PCB mixture found in fish consumed by humans.
- To assess the impact of developmental PCB exposure on auditory function in rats.
Main Methods:
- Female Long-Evans rats were exposed to a PCB mixture orally from pre-breeding through weaning.
- Auditory function was evaluated using distortion product otoacoustic emissions (DPOAEs) and auditory brainstem responses (ABRs).
Main Results:
- PCB exposure led to decreased DPOAE amplitudes.
- Elevated DPOAE and ABR thresholds were observed across multiple frequencies in exposed rats.
- These findings indicate impaired cochlear and central auditory pathway function.
Conclusions:
- Developmental PCB exposure causes significant auditory impairment in rats.
- Subtle auditory deficits in humans due to PCB exposure may contribute to observed cognitive deficits.
