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Vasopressin released within the central amygdala promotes maternal aggression
Oliver J Bosch1, Inga D Neumann
1Department of Behavioural and Molecular Neuroendocrinology, University of Regensburg, 93040 Regensburg, Germany. oliver.bosch@biologie.uni-regensburg.de
The European Journal of Neuroscience
|April 9, 2010
Summary
Brain vasopressin (AVP) regulates maternal aggression in rats. Higher AVP release in the central amygdala of high-anxiety dams correlates with increased aggression, suggesting AVP
Area of Science:
- Neuroscience
- Behavioral Endocrinology
- Animal Behavior
Background:
- Vasopressin (AVP) is known to influence social behaviors.
- Previous research highlighted AVP's role in male social behaviors and maternal care.
- This study focuses on AVP's involvement in maternal aggression in female rats.
Purpose of the Study:
- To investigate the role of brain vasopressin in regulating maternal aggression.
- To compare vasopressin activity in high (HAB) and low (LAB) anxiety-related behavior rat dams.
- To explore the neural mechanisms underlying vasopressin-mediated maternal aggression.
Main Methods:
- Used Wistar rats selectively bred for high (HAB) and low (LAB) anxiety.
- Measured vasopressin mRNA expression in brain regions.
- Employed intracerebral microdialysis to assess vasopressin release in the central amygdala and paraventricular nucleus during maternal aggression.
- Administered a vasopressin V1a receptor antagonist and synthetic vasopressin centrally.
- Assessed vasopressin receptor binding in key brain areas.
Main Results:
- HAB dams exhibited higher vasopressin mRNA expression and increased maternal aggression compared to LAB dams.
- Vasopressin release in the central amygdala, but not the paraventricular nucleus, was elevated during maternal aggression in HAB dams.
- Central amygdala vasopressin release positively correlated with offensive aggressive behavior.
- Blocking V1a receptors in the central amygdala reduced aggression in HAB dams; synthetic vasopressin increased aggression in LAB dams.
- Vasopressin receptor binding was similar between HAB and LAB females.
Conclusions:
- Vasopressin is a key neuropeptide regulating maternal aggressive behavior in female rats.
- Differences in vasopressin release within the central amygdala, not receptor binding, underlie variations in maternal aggression levels.
- This extends the known role of vasopressin in female social behavior.
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