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Age-dependent changes in clock neuron structural plasticity and excitability are associated with a decrease in

Jack A Curran1, Edgar Buhl1, Krasimira Tsaneva-Atanasova2

  • 1School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK.

Neurobiology of Aging
|March 3, 2019
PubMed
Summary
This summary is machine-generated.

Aging impacts fruit fly (Drosophila) circadian rhythms and sleep, increasing sleep duration and reducing activity. Neuronal changes in the circadian clock contribute to these age-related declines in behavior and rhythmicity.

Keywords:
AgingCircadian rhythmsDrosophilaElectrophysiologyIntrinsic excitabilitySleepSynaptic plasticity

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Aging Research

Background:

  • Aging significantly affects circadian behavior across species, with poorly understood mechanisms.
  • The fruit fly (Drosophila) exhibits an age-dependent decline in behavioral output and circadian rhythmicity.

Purpose of the Study:

  • To investigate the effects of aging on circadian behavior and sleep patterns in Drosophila.
  • To explore the underlying neural mechanisms of age-related changes in the Drosophila circadian clock.

Main Methods:

  • Electrophysiological recordings from large ventral lateral neurons in aging Drosophila.
  • Analysis of daily activity patterns and sleep behavior (duration, latency).
  • Assessment of neuronal input resistance, membrane potential, and spontaneous electrical activity.

Main Results:

  • Aging Drosophila showed increased sleep duration and reduced sleep latency.
  • A significant decrease in input resistance of ventral lateral neurons was observed with age.
  • Reduced daily plasticity in small ventral lateral neurons correlated with diminished circadian rhythmicity.

Conclusions:

  • Age-related changes in Drosophila neuronal electrical activity contribute to altered circadian behavior and sleep.
  • Decreased plasticity in circadian clock neurons underlies the loss of rhythmicity during aging.
  • These findings offer insights into the neurobiological impact of aging on circadian systems.