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[Thyroid pigments in Gunn rats].

M Japundzic, Ch Bastomsky, N J Nadler

    Bulletin De L'Association Des Anatomistes
    |June 1, 1975
    PubMed
    Summary

    Researchers studied thyroid pigment in Gunn rats, identifying yellow granules as lipofuscin. These pigment granules accumulate within lysosomes in follicular cells, impacting thyroid structure.

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    Area of Science:

    • Endocrinology
    • Cell Biology
    • Histochemistry

    Context:

    • Homozygous Gunn rats exhibit unique thyroid pigment.
    • Thyroid pigment's presence and distribution were previously uncharacterized.
    • Understanding cellular mechanisms of pigment accumulation is crucial.

    Purpose:

    • To structurally and histochemically characterize the thyroid pigment in homozygous Gunn rats.
    • To determine the origin and nature of the observed pigment granules.
    • To elucidate the cellular localization and ultrastructural features of the pigment.

    Summary:

    • Yellow pigment granules were observed in follicular cell cytoplasm and colloid.
    • Histochemical analysis revealed the pigment as basophilic, PAS-positive, acid-fast, and reducing.
    • Ultrastructural examination indicated pigment bodies resemble lysosomes or peroxisomes, suggesting accumulation within lysosomes.

    Impact:

    • Identifies the thyroid pigment as lipofuscin, a common age-related pigment.
    • Provides insights into lysosomal function and pigment metabolism in thyroid cells.
    • Establishes a cellular basis for pigment deposition in homozygous Gunn rats.

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