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Related Experiment Videos

Microprobe analysis of human otoconia.

M Anniko, J Ylikoski, R Wróblewski

    Acta Oto-Laryngologica
    |March 1, 1984
    PubMed
    Summary

    The elemental composition of otoconia (ear crystals) changes with age, with non-calcium elements decreasing and phosphate increasing in older individuals. Trisomy-18 fetal otoconia resemble early postnatal samples.

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    Area of Science:

    • Oto-neurology
    • Biomineralization
    • Developmental Biology

    Background:

    • Otoconia, calcium carbonate structures in the inner ear, are crucial for balance and hearing.
    • Their elemental composition and structural integrity may change with age and certain genetic conditions.

    Purpose of the Study:

    • To analyze the elemental composition of human otoconia across different life stages and in Trisomy-18.
    • To investigate age-related changes and potential 'phosphatization' in otoconia.

    Main Methods:

    • Energy dispersive X-ray microprobe analysis of 510 human otoconia samples.
    • Samples included fetal (Trisomy-18), infant, and adult specimens.

    Main Results:

    • All otoconia showed high calcium concentration, with detectable Na, Mg, P, S, Cl, and K.
    • Non-calcium elements were more prominent in fetal and infant otoconia.
    • Aging otoconia exhibited increased phosphorus, suggesting a transformation from calcite to apatite ('phosphatization').
    • Trisomy-18 fetal otoconia showed elemental similarity to early postnatal samples.

    Conclusions:

    • Otoconial elemental composition varies significantly with age, reflecting developmental and aging processes.
    • The observed 'phosphatization' in aged otoconia indicates a potential structural alteration.
    • Elemental profiles in Trisomy-18 fetuses suggest developmental similarities to early postnatal stages.

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