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Related Experiment Videos

A collision analysis of lymphoid cell aggregation.

C W Evans, J Proctor

    Journal of Cell Science
    |October 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Cell aggregation dynamics were studied using a Couette viscometer. Results show not all cells are equally adhesive, with a small fraction exhibiting enhanced aggregation potential, potentially relevant to early carcinoma development.

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    Area of Science:

    • Biophysics
    • Cell Biology
    • Rheology

    Background:

    • Cell aggregation is crucial in biological processes.
    • Understanding the forces governing cell adhesion is essential.
    • Previous models assumed homogenous cell populations.

    Purpose of the Study:

    • To investigate the frequency and size of lymphoid cell aggregates under shear stress.
    • To determine the adhesive forces between different lymphoid cell types.
    • To develop improved models of cell aggregation.

    Main Methods:

    • Utilized a Couette viscometer to apply laminar shear fields to lymphoid cells.
    • Measured aggregate size and frequency at varying shear rates.
    • Employed regression analysis to derive equations for aggregate diameter changes.

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  • Estimated the force of dissociation (FD) from critical shear rates.

    • Main Results:

    • Maximum aggregate diameter reached a plateau, indicating a balance between hydrodynamic and adhesive forces.
    • Thymocytes exhibited higher adhesive forces (FD=2.54 X 10(-6) N m-2/cell) than lymphocytes (FD=2.05 X 10(-6) N m-2/cell).
    • A model incorporating a 15% fraction of more adhesive cells best explained observed aggregate frequencies.
    • Cell populations are not homogenous in adhesive properties.

    Conclusions:

    • Lymphoid cell populations are heterogeneous, with a subset possessing enhanced adhesive capabilities.
    • Variations in this adhesive fraction influence aggregate-frequency indices.
    • These findings may have implications for understanding early-stage carcinoma development.