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Morphologic unity of Paneth cells.

S A Geller, S N Thung

    Archives of Pathology & Laboratory Medicine
    |September 1, 1983
    PubMed
    Summary

    Paneth cells, identified by lysozyme, appear in various tissues, not just the intestine. This suggests lysozyme is a general marker for intestinal cell differentiation.

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    Area of Science:

    • Gastroenterology
    • Oncology
    • Cell Biology

    Background:

    • Paneth cells are specialized epithelial cells found in the small intestine.
    • These cells contain characteristic eosinophilic granules and are known to secrete antimicrobial peptides, including lysozyme.

    Purpose of the Study:

    • To investigate the presence and characteristics of Paneth cells in both intestinal and extraintestinal sites.
    • To determine if lysozyme expression in Paneth cells is specific to a particular stimulus or a general feature of intestinal cell differentiation.

    Main Methods:

    • Utilized light microscopy with hematoxylin-eosin (HE) staining for initial cell identification.
    • Employed histochemical reactions, including the phosphotungstic acid-hematoxylin (PTAH) method.
    • Conducted immunohistochemical labeling for lysozyme using the peroxidase-antiperoxidase (PAP) method.

    Main Results:

    • Cells identified as Paneth cells consistently stained positive with PTAH and PAP-lysozyme.
    • Epithelial cells expressing lysozyme exhibited eosinophilic cytoplasmic granules on HE sections, consistent with Paneth cell morphology.
    • Lysozyme was detected in ovarian tumors (benign and malignant), ectopic intestinal tissues, and intestinal tumors (benign and malignant).

    Conclusions:

    • The presence of lysozyme in Paneth cells is a consistent feature across various tissues, including extraintestinal sites.
    • Lysozyme elaboration appears to be a nonspecific marker of intestinal-cell differentiation rather than a response to a specific stimulus.
    • These findings support a broader understanding of Paneth cell characteristics and their role in epithelial differentiation.

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