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Related Experiment Videos

Mitochondrial granule distribution in tooth germ cells

F S Sayegh, A Abousy

    The Anatomical Record
    |November 1, 1977
    PubMed
    Summary

    Intramitochondrial granules in rat odontoblasts appear during dentin mineralization and disappear as mineralization advances. This process is specific to odontoblasts and not observed in other pulp cells.

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    Area of Science:

    • Biomineralization
    • Cell Biology
    • Developmental Biology

    Background:

    • Odontoblasts are key cells in dentin formation.
    • Mitochondria play crucial roles in cellular processes, including energy metabolism and biomineralization.
    • The precise role of mitochondrial granules in hard tissue formation requires further elucidation.

    Purpose of the Study:

    • To investigate the presence and role of intramitochondrial granules in odontoblasts during tooth development.
    • To correlate the appearance and disappearance of these granules with specific stages of dentin mineralization.

    Main Methods:

    • Light and electron microscopy were used to examine incisor and molar tooth germs.
    • Albino rats were studied at various developmental stages, from embryonic (18-20 days in utero) to postnatal (1-7 days after birth).

    Main Results:

    • Intramitochondrial granules were observed in odontoblasts, comparable to those in other hard tissue cells.
    • These electron-dense granules appeared in significant numbers only when odontoblasts actively engaged in dentin mineralization.
    • As dentin mineralization progressed, odontoblast mitochondria became devoid of these granules.
    • Mesenchymal cells and preodontoblasts in the pulp did not exhibit this granular activity.

    Conclusions:

    • Intramitochondrial granules in odontoblasts are associated with active dentin mineralization.
    • The presence of these granules is transient, linked to the mineralization phase.
    • Odontoblasts exhibit unique mitochondrial activity during dentin biomineralization, distinct from other pulp cells.

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