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Electron microscope study on human lymphocyte-sheep erythrocyte rosettes.

K Kataoka, J Minowada, D Pressman

    Journal of the National Cancer Institute
    |December 1, 1975
    PubMed
    Summary
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    This study used transmission electron microscopy to examine nonimmune rosette formation between human lymphocytes and sheep red blood cells. Findings reveal specific membrane interactions and amorphous substance at the cell contact sites.

    Area of Science:

    • Cellular biology
    • Immunology
    • Microscopy

    Background:

    • Nonimmune rosette formation involves lymphocytes binding to red blood cells without antibodies.
    • Understanding the ultrastructural basis of this interaction is crucial for immunology.

    Purpose of the Study:

    • To investigate the ultrastructural characteristics of nonimmune rosette formation between human lymphocytes and sheep red blood cells using transmission electron microscopy.

    Main Methods:

    • Transmission electron microscopy was employed to visualize the cell-cell interactions.
    • Human peripheral blood lymphocytes and cultured MOLT 3/4 cells were used in conjunction with sheep red blood cells.

    Main Results:

    • At the rosette contact area, lymphoid and red blood cell membranes maintained a parallel orientation, separated by 80-100 Angstroms.

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  • A denser inner leaflet of the lymphoid cell membrane and an attached amorphous substance on its cytoplasmic face were observed.
  • The contact area, measuring 100-1000 nm, was predominantly located on the main cell body rather than on microvilli.

    • Conclusions:

    • The study provides detailed ultrastructural insights into the physical interactions during nonimmune rosette formation.
    • Specific membrane features and associated substances may play a role in mediating lymphocyte-red blood cell adhesion.