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Increased [3H]glutamate receptor binding in aged rats.

M Baudry, D S Arst, G Lynch

    Brain Research
    |October 26, 1981
    PubMed
    Summary

    As rats age, glutamate binding sites in the hippocampus increase, suggesting age-related brain changes. Calcium

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    Area of Science:

    • Neuroscience
    • Aging Research
    • Neurochemistry

    Background:

    • Glutamate is a key excitatory neurotransmitter in the brain.
    • Age-related changes in neurotransmitter systems can impact cognitive and physiological functions.
    • Understanding alterations in glutamate binding is crucial for aging research.

    Purpose of the Study:

    • To investigate age-dependent changes in glutamate binding in rat hippocampal membranes.
    • To determine if changes in binding are due to affinity or site density.
    • To explore the role of calcium in modulating glutamate binding with age.

    Main Methods:

    • Utilized radioligand binding assays with [3H]glutamate.
    • Examined binding in rat hippocampal membranes across different ages.
    • Assessed the influence of sodium-independent conditions and varying calcium concentrations.

    Main Results:

    • Na-independent [3H]glutamate binding increased with age, indicating more binding sites.
    • Apparent affinity for glutamate remained unchanged.
    • Calcium's maximal stimulatory effect on binding decreased with age, not its affinity.

    Conclusions:

    • Aging in rats is associated with an increased number of hippocampal glutamate binding sites.
    • Calcium's efficacy in stimulating glutamate binding diminishes with age.
    • These findings may relate to age-associated shifts in physiological and behavioral functions.

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