Neuropeptide Y does not reset the circadian clock in NPY Y2−/− mice

Mammalian circadian rhythms are modulated by neuropeptide Y (NPY), a peptide contained in the projection from the intergeniculate leaflet to the suprachiasmatic nuclei of the circadian pacemaker. NPY resets the circadian clock during the subjective day, mediating non-photic inputs. Previous studies...

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Bibliographic Details
Published in:Neuroscience letters 2005-01, Vol.373 (3), p.175-178
Main Authors: Soscia, Stephanie J., Harrington, Mary E.
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Biological Clocks - genetics
Biological Clocks - physiology
Circadian Rhythm - genetics
Circadian Rhythm - physiology
Circadian rhythms
Fundamental and applied biological sciences. Psychology
Knockout mice
Male
Mice
Mice, Knockout
Neuropeptide Y - physiology
NMDA
NPY
NPY Y2 receptor
Receptors, Neuropeptide Y - agonists
Receptors, Neuropeptide Y - deficiency
Receptors, Neuropeptide Y - genetics
Receptors, Neuropeptide Y - physiology
Suprachiasmatic nucleus
Vertebrates: nervous system and sense organs
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Summary:Mammalian circadian rhythms are modulated by neuropeptide Y (NPY), a peptide contained in the projection from the intergeniculate leaflet to the suprachiasmatic nuclei of the circadian pacemaker. NPY resets the circadian clock during the subjective day, mediating non-photic inputs. Previous studies using receptor-selective agonists have indicated that this action of NPY is mediated by the Y2 receptor in hamsters. The present study determined if NPY applied to the suprachiasmatic nuclei in the mid-subjective day can phase-advance the rhythm of spontaneous firing rate of Y2−/− mice. We observed that NPY did reset the rhythm of control mice but did not significantly shift the phase of this rhythm in the Y2−/− mice. These results provide strong evidence for the role of the Y2 receptor mediating neuropeptide Y subjective day phase-advance shifts in mice.
ISSN:0304-3940
1872-7972
DOI:10.1016/j.neulet.2004.08.081