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Related Experiment Videos

Peripheral circadian oscillators and their rhythmic regulation.

Chiaki Fukuhara1, Gianluca Tosini

  • 1Neuroscience Institute, Morehouse School of Medicine, Atlanta, GA 30310-1495, USA. fukuhac@msm.edu

Frontiers in Bioscience : a Journal and Virtual Library
|April 18, 2003
PubMed
Summary

Mammals have biological clocks controlling daily rhythms, primarily in the brain's SCN. Peripheral tissues also have clocks, but their rhythms fade, and how the SCN controls them is under investigation.

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Area of Science:

  • Chronobiology
  • Mammalian Physiology
  • Molecular Biology

Background:

  • Organisms exhibit 24-hour circadian rhythms governed by internal biological clocks.
  • In mammals, the suprachiasmatic nucleus (SCN) in the hypothalamus acts as the master circadian pacemaker.
  • Peripheral tissues contain circadian oscillators, but these are not self-sustaining in vitro.

Purpose of the Study:

  • To review recent findings on the function of extra-SCN (outside the suprachiasmatic nucleus) circadian oscillators.
  • To elucidate the mechanisms by which the SCN controls peripheral circadian oscillators.
  • To understand the reasons for circadian rhythm damping in peripheral tissues.

Main Methods:

  • Review of current scientific literature on circadian biology.

Related Experiment Videos

  • Analysis of molecular clockwork mechanisms in the SCN and peripheral tissues.
  • Investigation of SCN control pathways over peripheral oscillators.

    • Main Results:

    • Circadian oscillators exist in various mammalian organs and tissues.
    • Peripheral oscillators show damping in vitro, unlike the sustained rhythms in the SCN.
    • The SCN master pacemaker hierarchically controls peripheral oscillators for physiological coordination.

    Conclusions:

    • The molecular clockwork is similar in the SCN and periphery, but peripheral damping mechanisms remain unclear.
    • The SCN's hierarchical control over peripheral oscillators is crucial for whole-body physiological coordination.
    • Further research is needed to fully understand SCN-peripheral oscillator communication and peripheral clock stability.