Abstract
Neuropeptide S (NPS) is a regulatory peptide expressed by limited number of neurons in the brainstem. The simultaneous anxiolytic and arousal-promoting effect of NPS suggests an involvement in mood control and vigilance, making the NPS–NPS receptor system an interesting potential drug target. Here we examined, in detail, the distribution of NPS-immunoreactive (IR) fiber arborizations in brain regions of rat known to be involved in the regulation of sleep and arousal. Such nerve terminals were frequently apposed to GABAergic/galaninergic neurons in the ventro-lateral preoptic area (VLPO) and to tyrosine hydroxylase-IR neurons in all hypothalamic/thalamic dopamine cell groups. Then we applied the single platform-on-water (mainly REM) sleep deprivation method to study the functional role of NPS in the regulation of arousal. Of the three pontine NPS cell clusters, the NPS transcript levels were increased only in the peri-coerulear group in sleep-deprived animals, but not in stress controls. The density of NPS-IR fibers was significantly decreased in the median preoptic nucleus-VLPO region after the sleep deprivation, while radioimmunoassay and mass spectrometry measurements showed a parallel increase of NPS in the anterior hypothalamus. The expression of the NPS receptor was, however, not altered in the VLPO-region. The present results suggest a selective activation of one of the three NPS-expressing neuron clusters as well as release of NPS in distinct forebrain regions after sleep deprivation. Taken together, our results emphasize a role of the peri-coerulear cluster in the modulation of arousal, and the importance of preoptic area for the action of NPS on arousal and sleep.
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Abbreviations
- Arc:
-
Nucleus arcuatus
- DMN:
-
Dorsomedial nucleus of the hypothalamus
- DR:
-
Dorsal raphe
- HDB:
-
Nucleus of the horizontal limb of the diagonal band
- KF:
-
Kölliker-Fuse nucleus
- LC:
-
Locus coeruleus
- LDTg/PPTg:
-
Laterodorsal tegmental/pedunculopontine tegmental nuclei
- LPB:
-
Lateral parabrachial nucleus
- LPO:
-
Lateral preoptic area
- LS/MSbo:
-
Lateral septum/medial septum border zone
- LSV:
-
Lateral septal nucleus, ventral part
- MnPO:
-
Median preoptic nucleus
- MPOA:
-
Medial preoptic area
- MS:
-
Medial septum
- PC:
-
Peri-coerulear cell cluster (of NPS neurons)
- PB-PreC:
-
Parabrachial-precoeruleus region
- PVA:
-
Paraventricular thalamic nucleus, anterior part
- PVN:
-
Paraventricular hypothalamic nucleus
- PFA:
-
Perifornical area of the lateral hypothalamus
- SCN:
-
Suprachiasmatic nucleus
- SHy:
-
Septohypothalamic nucleus
- SLD:
-
Sublaterodorsal tegmental area
- VLPO:
-
Ventro-lateral preoptic nucleus
- VLPAG:
-
Ventro-lateral subdivision of the periaqueductal central gray
- VTA:
-
Ventral tegmental area
- VTM:
-
Ventral tuberomamillary nucleus
- ACTH:
-
Adrenocorticotrophin hormone
- CRF:
-
Corticotrophin releasing factor
- ChAT:
-
Choline acetyltransferase
- EDS:
-
Excessive daytime sleepiness
- EEG:
-
Electroencephalography
- HC:
-
Homecage
- HDC:
-
Histidine decarboxylase
- i.c.v.:
-
Intracerebroventricular
- IHC:
-
Immunohistochemistry
- IR:
-
Immunoreactive
- ISH:
-
In situ hybridization
- LPoW:
-
Large pot-on-water
- LPoW-R:
-
Large pot-on-water plus rebound sleep
- MCH:
-
Melanin concentrating hormone
- non-REMS:
-
Non-rapid eye movement sleep
- NPS:
-
Neuropeptide S
- NPSR1:
-
Neuropeptide S receptor 1
- PoW:
-
Pot-on-water
- qISH:
-
Quantitative in situ hybridization
- REMS:
-
Rapid eye movement sleep
- RIA:
-
Radioimmunoassay
- RT:
-
Room temperature
- SPoW:
-
Small pot-on-water
- SPoW-R:
-
Small pot-on-water plus rebound sleep
- SWS:
-
Slow-wave sleep
- TH:
-
Tyrosine hydroxylase
- OSAS:
-
Obstructive sleep apnea syndrome
- VGlut2:
-
Vesicular glutamate transporter 2
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Acknowledgments
This study was supported by the Swedish Research Council, Grants from Karolinska Institutet, the Rut&Arvid Wolff foundation for insomnia research, the National Hungarian Development Agency (Grant No. KTIA-NAP-13-1-2013-0001), the Hungarian Brain Research Program (Grant No. KTIA 13 NAP-A-II/14) and the Austrian Science Fund (FWF, Grant No. P25375). We are grateful for the excellent technical assistance of Blanca Silva-Lopez, Szilvia Deak and Agnes Ruzsits. We acknowledge the generous donation of antisera/antibodies to tyrosine hydroxylase (the late Dr. Menek Goldstein, NYU, New York, NY); orexin (Dr. Luis de Lecea, The Salk Institute, La Jolla, CA); histidine decarboxylase (the late Dr. John Walsh, CURE core facility, UCLA, Las Angeles, CA); vesicular glutamate transporter 2 (Dr. Masahiko Watanabe, Hokkaido University School of Medicine, Sapporo, Japan); galanin (Dr. Elvar Theodorsson, Linköping University, Linköping, Sweden); substance P (Dr. Ingrid Nylander, Uppsala University, Uppsala, and Dr. Lars Terenius, Karolinska Institutet, Stockholm, Sweden; choline acetyltransferase (Dr. Boyd Hartman, Department of Psychiatry, University of Minnesota, Minneapolis, MN).
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Adori, C., Barde, S., Vas, S. et al. Exploring the role of neuropeptide S in the regulation of arousal: a functional anatomical study. Brain Struct Funct 221, 3521–3546 (2016). https://doi.org/10.1007/s00429-015-1117-5
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DOI: https://doi.org/10.1007/s00429-015-1117-5