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Sleep patterning changes in a prenatal stress model of depression

Published online by Cambridge University Press:  29 August 2017

H. M. Sickmann
Affiliation:
Synaptic Transmission, H. Lundbeck A/S, Valby, Denmark Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen Ø, Denmark Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
C. Skoven
Affiliation:
Synaptic Transmission, H. Lundbeck A/S, Valby, Denmark Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen Ø, Denmark Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
J. F. Bastlund
Affiliation:
Synaptic Transmission, H. Lundbeck A/S, Valby, Denmark
T. B. Dyrby
Affiliation:
Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
N. Plath
Affiliation:
Synaptic Transmission, H. Lundbeck A/S, Valby, Denmark
K. A. Kohlmeier
Affiliation:
Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen Ø, Denmark
M. P. Kristensen*
Affiliation:
Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen Ø, Denmark
*
*Address for correspondence: Dr M. P. Kristensen, Department of Drug Design and Pharmacology, University of Copenhagen, Jagtvej 160, 2100 København Ø, Denmark. (Email [email protected])

Abstract

Clinical depression is accompanied by changes in sleep patterning, which is controlled in a circadian fashion. It is thus desirable that animal models of depression mirror such diurnally-specific state alterations, along with other behavioral and physiological changes. We previously found several changes in behavior indicative of a depression-like phenotype in offspring of rats subjected to repeated, variable prenatal stress (PNS), including increased locomotor activity during specific periods of the circadian cycle. We, therefore, investigated whether PNS rats also exhibit alterations in sleep/wakefulness behavior around the change from light-to-dark phase. Control and PNS Sprague–Dawley rats were implanted with electrodes for continuous monitoring of electroencephalic activity used to determine behavioral state. The distribution of slow-wave sleep (SWS), rapid eye movement sleep (REMS) and wakefulness was compared for periods before and after lights were turned off, between baseline conditions and after exposure to an acute stressor. Both REMS and SWS amounts were increased in PNS rats relative to control animals in the beginning of the dark phase. REMS changes were due to an increase in REMS bout number, rather than in bout duration. During this circadian time period, we did not find any sex differences in the state changes. These results indicate that PNS affects baseline sleep patterning in both male and female rats around active-phase onset.

Type
Original Article
Copyright
© Cambridge University Press and the International Society for Developmental Origins of Health and Disease 2017 

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