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Related Experiment Videos

Aging and ethanol alter neuronal electric membrane properties.

T A Bunting1, B S Scott

  • 1Department of Physiology, John Hopkins School of Medicine, Baltimore, MD.

Brain Research
|October 30, 1989
PubMed
Summary

Aging and ethanol significantly alter neuronal electrical membrane properties (EMP) in dorsal root ganglion (DRG) neurons. Age increases action potential duration and decreases excitability, while ethanol causes membrane expansion effects.

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Area of Science:

  • Neuroscience
  • Electrophysiology
  • Cellular Biology

Background:

  • Neuronal electrical membrane properties (EMP) are crucial for nerve function.
  • Understanding how aging and ethanol affect these properties is vital for neurological health.
  • Dorsal root ganglion (DRG) neurons play a key role in sensory transmission.

Purpose of the Study:

  • To investigate the independent and combined effects of donor mouse age and acute ethanol exposure on DRG neuron EMP.
  • To characterize age-related changes in neuronal electrical excitability and membrane characteristics.
  • To determine the impact of acute ethanol on neuronal EMP.

Main Methods:

  • Electrophysiological recordings were performed on 825 freshly dissociated dorsal root ganglion (DRG) neurons.

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  • The study analyzed parameters including action potential overshoot, afterhyperpolarization duration, action potential duration, electrical excitability, specific membrane resistance, specific membrane capacitance, and membrane time constant.
  • Both donor mouse age and acute ethanol exposure were systematically varied.

    • Main Results:

    • Aging significantly increased action potential overshoot (52%), afterhyperpolarization duration (50%), and action potential duration (31%), while decreasing electrical excitability.
    • Aging also increased specific membrane resistance and decreased specific membrane capacitance.
    • Acute ethanol exposure decreased electrical excitability, specific membrane capacitance, and time constant, while increasing specific membrane resistance, consistent with membrane expansion.

    Conclusions:

    • Neuronal EMP in DRG neurons undergo significant age-dependent alterations, supporting the hypothesis of in situ neuronal changes with age.
    • Acute ethanol exposure induces distinct EMP alterations, primarily attributed to a membrane expansion effect.
    • These findings highlight the vulnerability of neuronal electrical properties to both aging and ethanol intoxication.