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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Blockade of CCK(B) but not CCK(A) receptors before and after the stress of predator exposure prevents lasting increases in anxiety-like behavior: implications for anxiety associated with posttraumatic stress disorder.
Behavioral Neuroscience 1997 April
Lasting increases in anxiety-like behavior (ALB) in rodents in the elevated plus maze have been reported to follow brief (5 min) exposures to a cat. This study examined the role of CCK(A) and CCK(B) receptors in lasting increases in ALB following exposure to a cat. Block of CCK(B) receptors 30 min before and after cat exposure prevented increases in ALB assessed 1 week later in the elevated plus maze. Blocks of CCK(A) receptors either before or after cat exposure were without effect on increases in ALB measured 1 week later. Changes in activity or exploration could not account for the results. Effects of cat exposure on ALB, startle, and corticosteroid levels have been proposed as a model of affective disorder in posttraumatic stress disorder (PTSD). Implications of these findings for mechanisms of initiation of anxiety in PTSD and posttrauma pharmacological prophylaxis in PTSD are discussed.
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