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Saini, Camille; Liani, André; Curie, Thomas; Gos, Pascal; Kreppel, Florian; Emmenegger, Yann; Bonacina, Luigi; Wolf, Jean-Pierre; Poget, Yves-Alain; Franken, Paul; Schibler, Ueli
Genes & development, 2013-Jul-01, 2013-07-01, 20130701, Letnik: 27, Številka: 13Journal Article
The mammalian circadian timing system consists of a master pacemaker in the suprachiasmatic nucleus (SCN) in the hypothalamus, which is thought to set the phase of slave oscillators in virtually all body cells. However, due to the lack of appropriate in vivo recording technologies, it has been difficult to study how the SCN synchronizes oscillators in peripheral tissues. Here we describe the real-time recording of bioluminescence emitted by hepatocytes expressing circadian luciferase reporter genes in freely moving mice. The technology employs a device dubbed RT-Biolumicorder, which consists of a cylindrical cage with reflecting conical walls that channel photons toward a photomultiplier tube. The monitoring of circadian liver gene expression revealed that hepatocyte oscillators of SCN-lesioned mice synchronized more rapidly to feeding cycles than hepatocyte clocks of intact mice. Hence, the SCN uses signaling pathways that counteract those of feeding rhythms when their phase is in conflict with its own phase.
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