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Related Experiment Videos

Annulate lamellae in human tumor cells.

C N Sun, H J White

    Tissue & Cell
    |January 1, 1979
    PubMed
    Summary

    Annulate lamellae, cellular structures, were observed in various tumor types. Their connection to the endoplasmic reticulum suggests a role in protein synthesis.

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    Area of Science:

    • Cell Biology
    • Oncology
    • Electron Microscopy

    Background:

    • Annulate lamellae are complex membrane systems found in eukaryotic cells.
    • Their presence and function in tumor cells are not fully understood.
    • Previous studies have noted their association with the endoplasmic reticulum.

    Purpose of the Study:

    • To investigate the occurrence and ultrastructure of annulate lamellae in diverse human tumors.
    • To explore potential functional roles of annulate lamellae in neoplastic cells.

    Main Methods:

    • Electron microscopy was used to examine tumor samples.
    • Histopathological analysis identified tumor types and cellular features.
    • Ultrastructural details of annulate lamellae were documented.

    Main Results:

    • Annulate lamellae were identified in primitive neuroectodermal tumors, metastatic cerebellar tumors, testicular seminomas, retinoblastomas, and melanomas.
    • These structures appeared as stacked parallel arrays within the cytoplasm.
    • Continuity with the endoplasmic reticulum and the presence of ribosomes were observed on annulate lamellae.

    Conclusions:

    • Annulate lamellae are present in a variety of human tumors.
    • Their association with the endoplasmic reticulum and ribosomes suggests a potential role in protein synthesis within tumor cells.
    • Further research is needed to elucidate the precise functional significance of annulate lamellae in tumorigenesis.

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