期刊
ENEURO
卷 5, 期 4, 页码 -出版社
SOC NEUROSCIENCE
DOI: 10.1523/ENEURO.0129-18.2018
关键词
circadian; dopamine; PDF receptor; sleep; ventral lateral neurons; wake
资金
- Science and Engineering Research Board, Department of Science and Technology, India [SB/SO/AS/019/2013]
- Jawaharlal Nehru Centre for Advanced Scientific Research
Circadian clocks modulate timing of sleep/wake cycles in animals; however, the underlying mechanisms remain poorly understood. In Drosophila melanogaster, large ventral lateral neurons (l-LNv) are known to promote wakefulness through the action of the neuropeptide pigment dispersing factor (PDF), but the downstream targets of PDF signalling remain elusive. In a screen using downregulation or overexpression (OEX) of the gene encoding PDF receptor (pdfr), we found that a subset of dopaminergic neurons responds to PDF to promote wakefulness during the day. Moreover, we found that small LNv (s-LNv) and dopaminergic neurons form synaptic contacts, and PDFR signalling inhibited dopaminergic neurons specifically during day time. We propose that these dopaminergic neurons that respond to PDFR signalling are sleep-promoting and that during the day when PDF levels are high, they are inhibited, thereby promoting wakefulness. Thus, we identify a novel circadian clock pathway that mediates wake promotion specifically during day time.
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