NDLI: The Pronociceptive Effect of Paradoxical Sleep Deprivation in Rats: Evidence for a Role of Descending Pain Modulation Mechanisms

Content Provider	Springer Nature Link
Author	Tomim, Dabna H. Pontarolla, Felipe M. Bertolini, Jessica F. Arase, Mauricio Tobaldini, Glaucia Lima, Marcelo M. S. Fischer, Luana
Copyright Year	2015
Abstract	The mechanisms underlying the pronociceptive effect of paradoxical sleep deprivation (PSD) are not known. In this study, we asked whether PSD increases tonic nociception in the formalin test, decreases the antinociceptive effect of morphine administered into the periaqueductal gray matter (PAG), and disrupts endogenous descending pain modulation. PSD for either 24 or 48 h significantly increased formalin-induced nociception and decreased mechanical nociceptive paw withdrawal threshold. The maximal antinociceptive effect induced by morphine (0.9–9 nmol, intra-PAG) was significantly decreased by PSD. The administration of a low dose of the GABAA receptor antagonist, bicuculline (30–300 pmol, intra-PAG), decreased nociception in control rats, but not in paradoxical-sleep-deprived ones. Furthermore, the administration of the cholecystokinin (CCK) 2 receptor antagonist, YM022 (0.5–2 pmol) in the rostral ventral medulla (RVM), decreased nociception in paradoxical-sleep-deprived rats but not in control ones. While a dose of the CCK 2 receptor agonist, CCK-8 (8–24 pmol intra-RVM), increased nociception in control rats, but not in paradoxical-sleep-deprived ones. In addition, the injection of lidocaine (QX-314, 2 %, intra-RVM) decreased nociception in sleep-deprived rats, but not in control rats, while the lesion of the dorsolateral funiculus prevented the pronociceptive effect of PSD. Finally, PSD significantly increased c-Fos expression in the RVM. Therefore, PSD increases pain independently of its duration or of the characteristic of the nociceptive stimulus and decreases morphine analgesia at the PAG. PSD appears to increase pain by decreasing descending pain inhibitory activity and by increasing descending pain facilitatory activity.
Starting Page	1706
Ending Page	1717
Page Count	12
File Format	PDF
ISSN	08937648
Journal	Molecular Neurobiology
Volume Number	53
Issue Number	3
e-ISSN	15591182
Language	English
Publisher	Springer US
Publisher Date	2015-02-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pain Nociception Sleep Paradoxical sleep deprivation Descending pain modulation Morphine Neurosciences Neurobiology Cell Biology Neurology
Content Type	Text
Resource Type	Article
Subject	Neurology Cellular and Molecular Neuroscience

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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