Experimental traumatic brain injury induces a pervasive hyperanxious phenotype in rats.

Abstract:

:Mood disturbances, including depression and anxiety disorders, are common and disabling long-term sequelae of traumatic brain injury (TBI). These psychiatric conditions have generally been considered psychosocial consequences of the trauma, but neurobiological alterations and causes have also been implicated. Using a rat model of TBI (lateral fluid-percussion injury), this longitudinal study seeks to assess anxiety and depression-like behaviors following experimental TBI. Male Wistar rats (n = 20) received a severe (approximately 3.5 atmosphere) pressure pulse directed to the right sensorimotor cortex, or sham surgery (n = 15). At 1, 3, and 6 months following injury, all rats underwent four assessments of anxiety and depression-like behaviors: exposure to an open field, elevated plus maze test, the forced swim test, and the sucrose preference test. Injured animals displayed increased anxiety-like behaviors throughout the study, as evidenced by reduced time spent (p = 0.014) and reduced entries (p < 0.001) into the center area of the open field, and reduced proportion of time in the open arms of the plus maze (p = 0.015), compared to sham-injured controls. These striking changes were particularly evident 1 and 3 months after injury. No differences were observed in depression-like behaviors in the forced swim test (a measure of behavioral despair) and the sucrose preference test (a measure of anhedonia). This report provides the first evidence of persistent anxiety-like disturbances in an experimental model of TBI. This finding indicates that the common occurrence of these symptoms in human sufferers is likely to have, at least in part, a neurobiological basis. Studies in this model could provide insight into the mechanisms underlying affective disturbance in brain-injured patients.

journal_name

J Neurotrauma

journal_title

Journal of neurotrauma

authors

Jones NC,Cardamone L,Williams JP,Salzberg MR,Myers D,O'Brien TJ

doi

10.1089/neu.2008.0641

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

1367-74

issue

11

eissn

0897-7151

issn

1557-9042

journal_volume

25

pub_type

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