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Related Experiment Video

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Sympathetic motor neuron dysfunction is a missing link in age-associated sympathetic overactivity.

Lizbeth de La Cruz1, Derek Bui1, Claudia M Moreno1,2

  • 1Department of Physiology and Biophysics, University of Washington, Seattle, United States.

Elife
|December 3, 2024
PubMed
Summary

Aging sympathetic nervous system overactivity is linked to motor neuron changes. Reduced M current in peripheral sympathetic neurons contributes to age-related hyperexcitability.

Keywords:
KCNQ currentcell biologycellular agingintercellular communicationmouseneuronal hyper-excitabilityneuroscienceorgan dysfunctionsympathetic nervous system

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Area of Science:

  • Neuroscience
  • Gerontology
  • Physiology

Background:

  • Sympathetic nervous system overactivity is a key feature of aging.
  • Cellular mechanisms are poorly understood, with focus on the central nervous system.

Purpose of the Study:

  • To investigate the impact of aging on peripheral sympathetic motor neuron function.
  • To identify cellular mechanisms contributing to age-related sympathetic overactivity.

Main Methods:

  • Electrophysiological recordings from superior cervical ganglia neurons.
  • Comparison of neurons from young, middle-aged, and old mice.
  • Analysis of ion-channel activity and neuronal firing patterns.

Main Results:

  • Aging significantly alters intrinsic properties of sympathetic motor neurons.
  • Increased spontaneous and evoked firing responses were observed in aged neurons.
  • A reduction in M current was identified as a major factor in age-related hyperexcitability.

Conclusions:

  • Aging affects the function of peripheral sympathetic motor neurons.
  • Reduced M current contributes to sympathetic nervous system overactivity in aging.
  • Motor components of the sympathetic reflex are crucial in aging mechanisms.