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• W1930453831 startingPage "5858" @default.
• W1930453831 abstract "Background and Purpose Caffeine is one of the most commonly used psychoactive substances. Circadian rhythms consist of the main suprachiasmatic nucleus (SCN) clocks and peripheral clocks. Although caffeine lengthens circadian rhythms and modifies phase changes in SCN-operated rhythms, the effects on caffeine on the phase, period and amplitude of peripheral organ clocks are not known. In addition, the role of cAMP/Ca2+ signalling in effects of caffeine on rhythm has not been fully elucidated. Experimental Approach We examined whether chronic or transient application of caffeine affects circadian period/amplitude and phase by evaluating bioluminescence rhythm in PER2::LUCIFERASE knock-in mice. Circadian rhythms were monitored in vitro using fibroblasts and ex vivo and in vivo for monitoring of peripheral clocks. Key Results Chronic application of caffeine (0.1–10 mM) increased period and amplitude in vitro. Transient application of caffeine (10 mM) near the bottom of the decreasing phase of bioluminescence rhythm caused phase advance in vitro. Caffeine (0.1%) intake caused a phase delay under light–dark or constant dark conditions, suggesting a period-lengthening effect in vivo. Caffeine (20 mg·kg−1) at daytime or at late night-time caused phase advance or delay in bioluminescence rhythm in the liver and kidney respectively. The complicated roles of cAMP/Ca2+ signalling may be involved in the caffeine-induced increase of period and amplitude in vitro. Conclusions and Implications Caffeine affects circadian rhythm in mice by lengthening the period and causing a phase shift of peripheral clocks. These results suggest that caffeine intake with food/drink may help with food-induced resetting of peripheral circadian clocks." @default.
• W1930453831 created "2016-06-24" @default.
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• W1930453831 date "2014-11-24" @default.
• W1930453831 modified "2023-10-13" @default.
• W1930453831 title "Effects of caffeine on circadian phase, amplitude and period evaluated in cells<i>in vitro</i>and peripheral organs<i>in vivo</i>in PER2::LUCIFERASE mice" @default.
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• W1930453831 doi "https://doi.org/10.1111/bph.12890" @default.
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