STUDY OBJECTIVES: Most organisms have behavioral and physiological circadian rhythms, which are controlled by an endogenous clock. Although genetic analysis has revealed the intracellular mechanism of the circadian clock, the manner in which this clock communicates its temporal information to produce systemic regulation is still largely unknown. DESIGN: Sleep behavior was measured using the Drosophila Activity Monitoring System (DAMS) monitor under a 12 h light:12 h dark cycle and constant darkness (DD), and 5 min without recorded activity were defined as a bout of sleep. RESULTS: Here we show that Drosophila insulin-like peptides (DILPs) and their receptor (DInR) regulate sleep behavior. All mutants of the seven dilps and the mutant of their receptor exhibit decreases of total sleep except dilp4 mutants, whereas upregulation of DILP and DInR in the nervous system led to increased sleep. Histological analysis identified four previously unidentified neurons expressing DILP: D1, P1, L1, and L2, of which L1 and L2 belong to the LNd and LNv clock neurons that separately regulate different times of sleep. In addition, dilp2 levels significantly decrease when flies were fasted, which is consistent with a previous report that starvation inhibits sleep, further indicating that the dilp system is involved in sleep regulation. CONCLUSION: Taken together, the results indicate that the Drosophila insulin-like peptide system is a crucial regulator of sleep.
STUDY OBJECTIVES: Most organisms have behavioral and physiological circadian rhythms, which are controlled by an endogenous clock. Although genetic analysis has revealed the intracellular mechanism of the circadian clock, the manner in which this clock communicates its temporal information to produce systemic regulation is still largely unknown. DESIGN: Sleep behavior was measured using the Drosophila Activity Monitoring System (DAMS) monitor under a 12 h light:12 h dark cycle and constant darkness (DD), and 5 min without recorded activity were defined as a bout of sleep. RESULTS: Here we show that Drosophila insulin-like peptides (DILPs) and their receptor (DInR) regulate sleep behavior. All mutants of the seven dilps and the mutant of their receptor exhibit decreases of total sleep except dilp4 mutants, whereas upregulation of DILP and DInR in the nervous system led to increased sleep. Histological analysis identified four previously unidentified neurons expressing DILP: D1, P1, L1, and L2, of which L1 and L2 belong to the LNd and LNv clock neurons that separately regulate different times of sleep. In addition, dilp2 levels significantly decrease when flies were fasted, which is consistent with a previous report that starvation inhibits sleep, further indicating that the dilp system is involved in sleep regulation. CONCLUSION: Taken together, the results indicate that the Drosophilainsulin-like peptide system is a crucial regulator of sleep.
Authors: Jason W Millington; George P Brownrigg; Charlotte Chao; Ziwei Sun; Paige J Basner-Collins; Lianna W Wat; Bruno Hudry; Irene Miguel-Aliaga; Elizabeth J Rideout Journal: Elife Date: 2021-01-15 Impact factor: 8.140
Authors: Ahmed M Alsehli; Sifang Liao; Mohamed H Al-Sabri; Lukas Vasionis; Archana Purohit; Neha Behare; Laura E Clemensson; Michael J Williams; Helgi B Schiöth Journal: Pharmaceuticals (Basel) Date: 2022-01-10
Authors: Brian Y Chung; Jennifer Ro; Sabine A Hutter; Kylie M Miller; Lakshmi S Guduguntla; Shu Kondo; Scott D Pletcher Journal: Cell Rep Date: 2017-06-20 Impact factor: 9.995
Authors: Michael J Williams; Emelie Perland; Mikaela M Eriksson; Josef Carlsson; Daniel Erlandsson; Loora Laan; Tabusi Mahebali; Ella Potter; Robert Frediksson; Christian Benedict; Helgi B Schiöth Journal: Front Aging Neurosci Date: 2016-08-02 Impact factor: 5.750