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Related Concept Videos

Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Neuron-Astrocyte Interactions and Circadian Timekeeping in Mammals.

Nicola J Smyllie1, Michael H Hastings1, Andrew P Patton1

  • 1Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.

The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry
|April 11, 2024
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Summary

Biological clocks regulate daily rhythms, synchronized by light. Astrocytes, a type of glial cell, are now recognized as active partners with neurons in the brain's central circadian clock, influencing daily physiological cycles.

Keywords:
GABAbiological clockcryptochromeglutamatehypothalamusneuropeptidesperiodretinasleepsuprachiasmatic nucleus

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Cellular Biology

Background:

  • Daily behavioral and physiological rhythms are governed by endogenous biological clocks.
  • These circadian rhythms are synchronized by light cues but are disrupted by modern lifestyles, impacting health.
  • The suprachiasmatic nucleus (SCN) in the brain acts as the master circadian pacemaker, coordinating cellular clocks across tissues.

Purpose of the Study:

  • To introduce circadian timekeeping mechanisms at cellular and network levels.
  • To highlight the newly discovered role of astrocytes in the SCN network timekeeping.
  • To explore the interaction between astrocytes and neurons in regulating circadian rhythms.

Main Methods:

  • Review of existing literature on circadian biology.
  • Focus on cellular and molecular mechanisms of the SCN.
  • Analysis of astrocyte-neuron interactions within the SCN.

Main Results:

  • Astrocytes possess cell-autonomous molecular clocks.
  • Astrocytes actively regulate extracellular glutamate and GABA levels.
  • These astrocyte-mediated changes influence circadian patterns of SCN neuronal activity.

Conclusions:

  • Astrocytes are not merely supportive but are active participants in SCN timekeeping.
  • The interplay between astrocyte and neuronal circadian clocks is crucial for brain function.
  • Understanding astrocyte contributions offers new insights into circadian regulation and its disruption.