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Related Experiment Videos

Electron microscopic observations on extraneuronal lipofuscin in the monkey brain

E F El-Ghazzawi, H A Malaty

    Cell and Tissue Research
    |August 27, 1975
    PubMed
    Summary

    Lipofuscin granules, a marker of aging, are normally cleared from brain cells in young monkeys via glial and phagocytic cells. This removal mechanism fails with age, leading to lipofuscin accumulation in neurons.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Aging Research

    Background:

    • Lipofuscin granules are osmiophilic bodies accumulating in cells with age.
    • Extraneuronal lipofuscin has been observed in brain tissue, but its removal mechanisms are not fully understood.

    Purpose of the Study:

    • To investigate the ultrastructure and location of lipofuscin granules in extraneuronal sites within monkey brain tissue.
    • To elucidate the cellular mechanisms involved in lipofuscin removal from neurons.

    Main Methods:

    • Ultrastructural analysis of brain tissue from young and old monkeys.
    • Identification and localization of lipofuscin granules in various cell types.

    Main Results:

    • Lipofuscin granules were found in neuroglia, phagocytic cells, pericytes, and capillary endothelium.
    • These granules were more abundant in extraneuronal sites in younger animals.
    • Evidence suggests a normal removal pathway for lipofuscin from neurons to capillary endothelium via glial and phagocytic cells.

    Conclusions:

    • Lipofuscin removal from neurons is an active process, particularly in youth, involving glial and phagocytic cells.
    • Age-related decline in the activity of these cellular components likely impairs lipofuscin clearance, leading to neuronal accumulation in senescence.

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