Related Experiment Video
Updated: Jul 23, 2026
07:18
A Behavioral Test Battery for the Repeated Assessment of Motor Skills, Mood, and Cognition in Mice
Published on: March 2, 2019
Changes in brain dopamine levels and aggressive behavior with aging in 2 mouse strains.
Experientia
|May 15, 1977
Summary
Aging alters brain monoamines differently across mouse strains. ICR mice showed increased dopamine and aggression, while C57BL6J mice exhibited subtle changes and benign behavior.
Area of Science:
- Neuroscience
- Genetics
- Behavioral Science
Background:
- Brain monoamine systems undergo changes with aging.
- Genetic background influences neurobiological and behavioral responses to aging.
Purpose of the Study:
- To investigate strain-specific genetic programming of brain monoamine alterations during aging.
- To correlate neurochemical changes with behavioral phenotypes in aged mice.
Main Methods:
- Comparative analysis of brain monoamine levels in two different mouse strains (ICR and C57BL6J) at 32 weeks of age.
- Behavioral assessments including irritability and aggression scoring.
- Examination of age-related neurochemical and behavioral differences between sexes.
Main Results:
- ICR mice exhibited a marked increase in dopamine and demonstrated intense irritability and aggressive behavior in males.
- C57BL6J mice showed only slight changes in brain amines with benign behavior.
- Aged females of both strains displayed similar amine changes but did not exhibit aggressive behavior.
Conclusions:
- Genetic factors significantly modulate age-related brain monoamine changes and associated behaviors.
- Dopamine levels and aggressive behavior in aging mice are strain-dependent.
- Sex influences behavioral outcomes in response to age-related neurochemical shifts.
