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Inhibition of nitric oxide synthase accentuates endotoxin-induced sickness behavior in mice.
- Source :
-
Pharmacology, biochemistry, and behavior [Pharmacol Biochem Behav] 2013 Jan; Vol. 103 (3), pp. 535-40. Date of Electronic Publication: 2012 Oct 06. - Publication Year :
- 2013
-
Abstract
- Sickness behavior appears to be the expression of a central motivational state that reorganizes an organism's priorities to cope with infectious pathogens. To evaluate the possible participation of nitric oxide (NO) in lipopolysaccharide-induced sickness behaviors, mice were submitted to the forced swim test (FST), open field test and dark-light box test. Food intake and corticosterone plasma levels were evaluated. Lipopolysaccharide (LPS, 100 μg/kg; i.p.) administration increased the time spent floating in the FST and decreased locomotor activity in the open field. Indeed, treatment with LPS decreased the total number of transitions between the dark and light compartments of the apparatus. In addition, LPS reduced food intake and increased corticosterone levels. Pretreatment with L-NAME (30 mg/kg; i.p.) or aminoguanidine (50mg/kg; i.p.) accentuated the behavioral changes induced by LPS in the FST, open field and light-dark box tests as well as induced an increment in hypophagia and in corticosterone levels. These findings confirm previous observations that have reported LPS-induced sickness behaviors. In addition, they provide evidence that the synthesis of NO modulates changes in depressive-like and exploratory behaviors in mice, which is supported by the fact that NO synthase inhibitors also attenuate LPS-induced behavioral changes. In addition, the present study suggests that NO may have a protective role, acting in an inhibitory feedback manner to limit LPS-induced sickness behavior.<br /> (Copyright © 2012 Elsevier Inc. All rights reserved.)
- Subjects :
- Animals
Behavior, Animal drug effects
Behavior, Animal physiology
Body Weight drug effects
Body Weight physiology
Corticosterone metabolism
Drug Synergism
Eating drug effects
Eating physiology
Enzyme Inhibitors pharmacology
Exploratory Behavior drug effects
Exploratory Behavior physiology
Feeding Behavior drug effects
Feeding Behavior physiology
Guanidines pharmacology
Male
Mice
NG-Nitroarginine Methyl Ester pharmacology
Nitric Oxide Synthase metabolism
Plasma metabolism
Illness Behavior drug effects
Illness Behavior physiology
Lipopolysaccharides adverse effects
Nitric Oxide physiology
Nitric Oxide Synthase antagonists & inhibitors
Subjects
Details
- Language :
- English
- ISSN :
- 1873-5177
- Volume :
- 103
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Pharmacology, biochemistry, and behavior
- Publication Type :
- Academic Journal
- Accession number :
- 23046850
- Full Text :
- https://doi.org/10.1016/j.pbb.2012.09.022