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Related Experiment Videos

Genotypic variation in striatal calmodulin content.

J A Severson

    Brain Research
    |August 5, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Differences in mouse brain chemistry, specifically striatal calmodulin levels, correlate with variations in dopamine receptor density. CBA/J mice show higher calmodulin and lower dopamine receptor levels compared to BALB/cJ mice.

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    Area of Science:

    • Neuroscience
    • Neurochemistry
    • Genetics

    Background:

    • Quantitative differences exist in the nigrostriatal projection between CBA/J and BALB/cJ mouse strains.
    • CBA/J mice exhibit lower levels of nigral tyrosine hydroxylase-reactive neurons, reduced nigral and striatal tyrosine hydroxylase activity, and decreased striatal D-2 dopamine receptor density compared to BALB/cJ mice.
    • C57BL/6J mice possess an intermediate striatal D-2 dopamine receptor density, and CBA/J mice show impaired development of monoaminergic receptor supersensitivity.

    Purpose of the Study:

    • To investigate the role of calmodulin in striatal dopaminergic receptor mechanisms.
    • To examine strain-specific differences in striatal calmodulin levels in CBA/J, C57BL/6J, and BALB/cJ mice.
    • To explore the relationship between calmodulin levels and dopamine receptor subtypes in different mouse strains.

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    Main Methods:

    • Quantification of striatal calmodulin levels across CBA/J, C57BL/6J, and BALB/cJ mouse strains.
    • Analysis of calmodulin distribution between soluble and particulate fractions under varying calcium and EGTA conditions.
    • Gel filtration chromatography of heat-treated soluble striatal extracts to assess calmodulin characteristics.

    Main Results:

    • Striatal calmodulin levels were significantly higher in CBA/J mice compared to both C57BL/6J and BALB/cJ mice.
    • Cerebral cortical calmodulin levels were similar across all three strains.
    • Calcium and EGTA treatments demonstrated similar calmodulin redistribution patterns in the soluble and particulate fractions across strains, with higher total striatal calmodulin observed in CBA/J mice.

    Conclusions:

    • Strain differences in striatal calmodulin levels exist and may contribute to variations in striatal dopamine receptor subtypes.
    • Calmodulin's role in dopaminergic receptor function warrants further investigation, particularly concerning its potential involvement in observed strain-specific neurochemical profiles.
    • These findings provide insights into the genetic underpinnings of neurochemical variations and their impact on dopaminergic systems.