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Lymphocyte differentiation in the rabbit thymus.

W Leene, P J Roholl, C de Groot

    Annales D'Immunologie
    |November 1, 1976
    PubMed
    Summary
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    Rabbit thymus lymphoid cells separated by density revealed three subpopulations. Increased plasma membrane component mobility is linked to T-cell education in the thymus.

    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • The thymus is crucial for T-cell development and education.
    • Lymphoid cell subpopulations within the thymus exhibit distinct characteristics.

    Purpose of the Study:

    • To investigate the density heterogeneity of rabbit thymus lymphoid cells.
    • To explore the relationship between cell density, cortisone resistance, and plasma membrane properties during T-cell education.

    Main Methods:

    • Density gradient centrifugation using Ficoll-Metrizoate to separate rabbit thymus lymphoid cells.
    • Freeze-fracture electron microscopy to analyze intramembranous particles (IMPs) in plasma membranes.
    • Assessment of cortisone resistance and cell size.

    Main Results:

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  • Three distinct lymphoid cell subpopulations were identified with peak densities at approximately 1.067, 1.077, and 1.084 g/ml.
  • The lowest density subpopulation (approx. 1.067 g/ml) comprised cortisone-resistant cells with a low nucleo-cytoplasmic ratio.
  • Increased glycerol-induced redistribution of IMPs was observed in the low-density subpopulation and in cells from cortisone-treated rabbits, but not in the highest density subpopulation.

    • Conclusions:

    • Density separation effectively isolates distinct rabbit thymus lymphoid cell populations.
    • Enhanced plasma membrane component mobility, indicated by IMP redistribution, is associated with cortisone-resistant cells and may be a key feature of T-cell education in the rabbit thymus.