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Regional brain catechol-O-methyl transferase: age related differences in the mouse
Abstract:
Activity levels of COMT were measured in the frontal cortex, hippocampus, hypothalamus and amygdala of two strains of male mice, C57BL/6J and DBA/2J, at various ages between 2 and 30 months. Determinations were made in mice housed under normal conditions and in mice exposed to a form of mild stress, an open-field apparatus, for 5 minutes. There were no major significant differences between the two strains as a function of age. However, after the open-field experience, C57BL/6J mice appeared significantly more responsive to the environment, as interpreted by increases in COMT, than DBA/2J mice. Interpretation is offered that C57BL/6J mice possess a more labile norepinephrine system, in spite of aging, than DBA/2J mice.
Insights
Catechol-O-methyltransferase (COMT) activity in male mice brains was assessed across ages and after mild stress. C57BL/6J mice showed greater COMT response to stress than DBA/2J mice, suggesting a more adaptable norepinephrine system.
Area of Science:
- Neuroscience
- Pharmacology
- Genetics
Background:
- Catechol-O-methyltransferase (COMT) is a key enzyme in neurotransmitter metabolism.
- Understanding COMT activity in different brain regions is crucial for neurological research.
- Mouse strain differences can reveal genetic influences on neurobiological processes.
Purpose of the Study:
- To investigate age-related changes in COMT activity in two mouse strains.
- To examine the effect of acute mild stress on COMT activity.
- To compare the neurochemical responsiveness of C57BL/6J and DBA/2J mice.
Main Methods:
- Assessed COMT activity in the frontal cortex, hippocampus, hypothalamus, and amygdala.
- Utilized two male mouse strains: C57BL/6J and DBA/2J.
- Measured COMT levels in mice aged 2-30 months under basal and post-stress (open-field test) conditions.
Main Results:
- No significant age-related differences in COMT activity were observed between the strains.
- C57BL/6J mice exhibited a significantly greater increase in COMT activity after the open-field stress compared to DBA/2J mice.
- This suggests strain-specific differences in response to environmental stimuli.
Conclusions:
- C57BL/6J mice demonstrate a more responsive catecholamine system, particularly norepinephrine, compared to DBA/2J mice, even with aging.
- Mild stress differentially impacts COMT activity, highlighting strain-specific neurobiological adaptations.
- Findings contribute to understanding genetic variability in stress response and neurotransmitter regulation.