Journal
MOLECULAR BRAIN
Volume 9, Issue -, Pages -Publisher
BIOMED CENTRAL LTD
DOI: 10.1186/s13041-016-0239-x
Keywords
Anxiety; Elevated plus-maze; Anterior cingulate cortex; Adenylyl cyclase 8; Retest; Memory; N-Methyl-D-aspartate
Categories
Funding
- Canada Research Chair
- NSERC (Natural Sciences and Engineering Research Council of Canada) discovery grant [RGPIN 402555]
- Azrieli Foundation and Brain Canada
- Canadian Institute for Health Research [258523]
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Background: Anxiety disorder is a state of mental discomfort while acute anxiety induces an enhancement of vigilance/arousal or increased anxious responses. Most of the previous studies investigated basic mechanisms for acute anxiety, while less information is available for prolonged or repetitive anxiety. Results: In the present study, we wanted to examine possible molecular mechanisms for behavioral anxiety after repeated exposures. Performing a paradigm of five sessions of the elevated plus-maze (EPM), we show that the repeated exposure to the EPM induces a long-lasting anxiety causing a gradual increase of anxiolytic activity, which is maintained for at least 21 days. Genetic deletion of AC8 (adenylyl cyclase 8) but not AC1 abolished long-lasting anxiety. Conclusions: Our results suggest that calcium-stimulated AC8 is required to sustain the long-lasting anxiety caused by repeated EPM testing, and we can identify in AC8 a novel target for treating anxiety-related mood disorders.
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