Circadian Phase Adjustment to Light Cycle Changes
Objective: Monitor intrinsic Per1 expression patterns in different brain areas and assess their response to changes in the light cycle, specifically measuring phase adjustment kinetics of circadian oscillators in isolated brain regions after 6 hour advances or delays
This is a Circadian Phase Adjustment to Light Cycle Changes protocol using rat as the model organism. The procedure involves 4 procedural steps, 2 equipment items, 1 materials. Extracted from a 2002 paper published in Journal of Neuroscience.
Model and subjects
rat • Per-luciferase transgene carriers • unknown • Not specified • Not specified
Study window
~3 day study window | ~18 hours hands-on
Core workflow
Tissue preparation and culture initiation • Baseline rhythm characterization • Light cycle phase shift application
Primary readouts
- Per1 expression patterns in different brain regions
- Presence or absence of circadian rhythmicity in 27 brain areas examined
- Peak expression timing (subjective night vs other times)
- Duration of rhythm persistence in vitro (>3 days for pineal and pituitary)
Key equipment and reagents
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Protocol Steps
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Tissue preparation and culture initiation
Neural tissues were cultured from rats carrying the Per-luciferase transgene to establish baseline circadian rhythmicity monitoring
Note: Multiple brain areas were examined including pineal, pituitary, olfactory bulb, ventral hypothalamus, paraventricular nucleus, and arcuate nucleus
View evidence from paper
“Neural tissues cultured from rats carrying the Per-luciferase transgene were used to monitor the intrinsic Per1 expression patterns in different brain areas”
Baseline rhythm characterization
Monitor Per1 expression patterns in cultured brain tissues to establish baseline circadian rhythmicity and identify which brain areas express rhythmic patterns
Note: 14 of 27 brain areas examined were rhythmic; pineal and pituitary expressed rhythms persisting for >3 days in vitro with peak expression during subjective night
View evidence from paper
“The pineal and pituitary glands both expressed rhythms that persisted for >3 d in vitro, with peak expression during the subjective night”
Light cycle phase shift application
Apply 6 hour advance or 6 hour delay in the light cycle to cultured brain tissues
Note: Phase shifts were applied to assess adjustment kinetics in different brain regions
View evidence from paper
“After a 6 hr advance or delay in the light cycle, the pineal, paraventricular nucleus of the hypothalamus, and arcuate nucleus each adjusted the phase of their rhythmicity”
Phase adjustment kinetics monitoring
Monitor and measure the phase adjustment response of different brain regions following the light cycle shift
Note: Different brain regions showed different kinetics of phase adjustment to the light cycle change
View evidence from paper
“the pineal, paraventricular nucleus of the hypothalamus, and arcuate nucleus each adjusted the phase of their rhythmicity with different kinetics”