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Related Experiment Videos

The glutamate induced phase shift in the SCN slice: a two pulse study

P Franken1, V Cao, H C Heller

  • 1Department of Biological Sciences, Stanford University, Stanford, CA, USA. paul.franken@hcuge.ch

Brain Research
|January 23, 1999
PubMed
Summary

Two glutamate pulses reset the rat suprachiasmatic nucleus (SCN) circadian clock by inducing a phase delay. This suggests distinct SCN neuronal populations may desynchronize due to varying glutamate sensitivity.

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Area of Science:

  • Neuroscience
  • Chronobiology

Background:

  • The suprachiasmatic nucleus (SCN) acts as the master circadian clock in mammals.
  • Understanding the SCN's short-term dynamics is crucial for circadian rhythm research.

Purpose of the Study:

  • To investigate the effects of a double-pulse glutamate stimulation on the circadian clock dynamics of rat SCN in vitro.
  • To determine the phase-shifting capacity of sequential glutamate pulses on SCN neuronal activity.

Main Methods:

  • Rat SCN slices were treated with single or double pulses of l-glutamate.
  • Single unit activity (SUA) was recorded on subsequent days to mark circadian phase.
  • Phase shifts were quantified by analyzing the time-of-peak SUA relative to untreated controls.

Main Results:

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  • A single glutamate pulse at ZT 14 caused a 3-hour delay in peak SUA.
  • A second pulse 3 hours later resulted in a bimodal SUA distribution on day 2, indicating a 6-hour phase delay.
  • The additive effect suggests a phase shift completion within 3 hours for at least one SCN neuronal sub-population.

Conclusions:

  • The SCN may contain distinct neuronal populations with differential glutamate sensitivity, leading to desynchronization.
  • Double glutamate pulses can induce a phase delay twice that of a single pulse.
  • Circadian phase resetting in the SCN is influenced by the timing and number of stimuli.