We made use of targeted disruption of the mouse angiotensinogen (ATN) gene to examine the functional role of the ATN in the central nervous system. Both male and female ATN-deficient mice displayed the reduction of depressive-like behavior in the behavioral despair swim tests and spontaneous locomotor activity diminished. However, both male and female ATN-deficient mice showed no anxiogenic-like or memory-deficit behavior and there was no change in the pain threshold. We propose that endogenous ATN in the central nervous system may regulate the depressant state in the brain.
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