Caffeine lengthens circadian rhythms in mice.

Abstract:

:Although caffeine alters sleep in many animals, whether or not it affects mammalian circadian clocks remains unknown. Here, we found that incubating cultured mammalian cell lines, human osteosarcoma U2OS cells and mouse fibroblast NIH3T3 cells, with caffeine lengthened the period of circadian rhythms. Adding caffeine to ex vivo cultures also lengthened the circadian period in mouse liver explants from Per2::Luciferase reporter gene knockin mice, and caused a phase delay in brain slices containing the suprachiasmatic nucleus (SCN), where the central circadian clock in mammals is located. Furthermore, chronic caffeine consumption ad libitum for a week delayed the phase of the mouse liver clock in vivo under 12 h light-dark conditions and lengthened the period of circadian locomotor rhythms in mice under constant darkness. Our results showed that caffeine alters circadian clocks in mammalian cells in vitro and in the mouse ex vivo and in vivo.

authors

Oike H,Kobori M,Suzuki T,Ishida N

doi

10.1016/j.bbrc.2011.06.049

subject

Has Abstract

pub_date

2011-07-08 00:00:00

pages

654-8

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(11)01007-2

journal_volume

410

pub_type

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