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Curr Biol. 2017 Aug 21;27(16):2465-2475.e3. doi: 10.1016/j.cub.2017.06.084. Epub 2017 Aug 3.

Direct Midbrain Dopamine Input to the Suprachiasmatic Nucleus Accelerates Circadian Entrainment.

Author information

1
Department of Biology, University of Virginia, 485 McCormick Road, Charlottesville, VA 22904, USA.
2
Departments of Pharmacology and Psychiatry and Behavioral Sciences, University of Washington, 1959 NE Pacific Street, Seattle, WA 98195, USA.
3
Department of Biology, University of Virginia, 485 McCormick Road, Charlottesville, VA 22904, USA; Department of Neuroscience, School of Medicine, University of Virginia, 409 Lane Road, Charlottesville, VA 22908, USA. Electronic address: aguler@virginia.edu.

Abstract

Dopamine (DA) neurotransmission controls behaviors important for survival, including voluntary movement, reward processing, and detection of salient events, such as food or mate availability. Dopaminergic tone also influences circadian physiology and behavior. Although the evolutionary significance of this input is appreciated, its precise neurophysiological architecture remains unknown. Here, we identify a novel, direct connection between the DA neurons of the ventral tegmental area (VTA) and the suprachiasmatic nucleus (SCN). We demonstrate that D1 dopamine receptor (Drd1) signaling within the SCN is necessary for properly timed resynchronization of activity rhythms to phase-shifted light:dark cycles and that elevation of DA tone through selective activation of VTA DA neurons accelerates photoentrainment. Our findings demonstrate a previously unappreciated role for direct DA input to the master circadian clock and highlight the importance of an evolutionarily significant relationship between the circadian system and the neuromodulatory circuits that govern motivational behaviors.

KEYWORDS:

D1 dopamine receptor; SCN; circadian entrainment; dopamine; dopaminergic neurons; hypothalamic circuitry; jet lag; photoentrainment; suprachiasmatic nucleus; ventral tegmental area

PMID:
28781050
PMCID:
PMC5568465
DOI:
10.1016/j.cub.2017.06.084
[Indexed for MEDLINE]
Free PMC Article

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