Key result
Rat aortas display circadian sensitivity to vasoactive agents with alternating peaks for constriction and relaxation.
Why the study?
Time-dependent variations in the in vitro sensitivity of rat aorta to vasoconstricting and relaxing agents were investigated to understand circadian influences on vascular responsiveness.
Population
Rat thoracic aorta rings from animals sacrificed at four different times of day
Comparison
Sensitivity to phenylephrine, 5-hydroxytryptamine, and relaxing agents at different times
Design
In vitro experimental study with circadian time comparison
Authors
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May inform chronotherapy timing in vascular disease; leaves open translation from rat aorta in vitro to human responses.
The time of day animals are sacrificed significantly influences the in vitro sensitivity of vascular preparations to vasoactive agents, which is a critical methodological consideration for preclinical research.
Keskil et al. (1996) studied this question. Time of day of sacrifice (circadian rhythm) vs. Different times of the day was evaluated on Sensitivity of aorta preparations to vasoconstricting or relaxing agents. Rat aorta sensitivity to vasoactive agents exhibited significant circadian rhythms, with peak constricting effects of phenylephrine at 15:00 and maximum relaxations at 03:00.
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