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Related Experiment Videos

Age-dependent alterations in synaptic membrane systems for Ca2+ regulation.

M L Michaelis, K Johe, T E Kitos

    Mechanisms of Ageing and Development
    |April 1, 1984
    PubMed
    Summary

    Aging alters key calcium regulation systems in rat brain synapses. These changes, though small, may impact neuronal function and survival.

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    Area of Science:

    • Neuroscience
    • Aging Research
    • Cellular Biology

    Background:

    • Neuronal function relies on precise calcium (Ca2+) regulation within synapses.
    • Aging is associated with cellular changes that can affect neuronal health.
    • Plasma membrane transport systems play a critical role in maintaining intracellular Ca2+ homeostasis.

    Purpose of the Study:

    • To investigate the impact of aging on two critical Ca2+ regulating systems in rat brain synaptic membranes.
    • To compare the kinetic characteristics of Na+-dependent Ca2+ transport and Ca2+-activated ATPase activity between adult and aged rats.

    Main Methods:

    • Isolation of synaptic membranes from the brains of adult (5-7 months) and aged (23-25 months) Fisher 344 rats.
    • Analysis of kinetic parameters for the Na+-dependent Ca2+ transport system.
    • Assay of Ca2+-activated, Mg2+-dependent ATPase activity.

    Main Results:

    • The Na+-dependent Ca2+ transport system showed decreased Ca2+ affinity in aged rats, with minimal change in transport capacity.
    • Ca2+-activated, Mg2+-dependent ATPase activity exhibited a lower Vmax for Ca2+ activation in aged rats, without altering the K0.5 for Ca2+.
    • Observed alterations in Ca2+ regulation systems were small but consistent between aged and adult rats.

    Conclusions:

    • Aging induces subtle but consistent alterations in neuronal plasma membrane Ca2+ regulatory systems.
    • These changes in synaptic Ca2+ homeostasis may progressively impair synaptic transmission.
    • Dysregulation of intraterminal Ca2+ due to aging could contribute to neuronal dysfunction and eventual cell death.

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