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Aggression-associated changes in murine olfactory tubercle bioamines
1Division of Cell Biology and Biophysics, Schools of Biological Science and Medicine, University of Missouri-Kansas City, 5007 Rockhill Road, Kansas City, MO 64110-2499, USA. garrisd@umkc.edu
Brain Research
|February 1, 2003
Summary
Aggressive behavior in mice is linked to specific brain chemical changes. Isolation-induced aggression showed altered norepinephrine and dopamine in the olfactory tubercle, while olfactory bulb removal increased serotonin in the same region.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Animal Models
Background:
- Intraspecies aggression is a complex behavior influenced by neurobiological factors.
- Brain bioamine levels, including norepinephrine, dopamine, and serotonin, are implicated in regulating social behaviors.
- Understanding the neurochemical underpinnings of aggression can provide insights into social behavior regulation.
Purpose of the Study:
- To investigate the relationship between regional brain bioamine levels and intraspecies aggressive behavior in two distinct murine models.
- To identify specific alterations in norepinephrine, dopamine, and serotonin concentrations associated with different types of aggression.
Main Methods:
- Two murine models of aggression were used: isolation-induced aggression and experimentally-induced aggression via olfactory bulbectomy (Obx).
- High-performance liquid chromatography (HPLC) was employed to quantify norepinephrine (NE), dopamine (DA), and serotonin (5-HT) levels in the olfactory tubercle (OT) and hypothalamus (HYPOTH).
- Behavioral assessments were correlated with neurochemical measurements in aggregated (control) and aggressive (isolated or Obx) groups.
Main Results:
- Isolation-induced aggressive mice exhibited elevated NE and decreased DA in the OT compared to aggregated controls.
- Olfactory bulbectomized (Obx) mice showed increased 5-HT in the OT compared to sham-operated controls.
- No significant changes in hypothalamic bioamine levels were observed in either model relative to controls.
Conclusions:
- Distinct types of intraspecies aggressive behavior in mice are associated with specific alterations in regional bioamine levels within the olfactory tubercle.
- These findings suggest a causal relationship between identified changes in forebrain bioamine concentrations and the manifestation of specific aggressive behaviors.
- The olfactory tubercle appears to be a critical neural locus for processing social information and mediating aggressive responses.