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Related Experiment Videos

What is red cell deformability?

H Schmid-Schönbein, P Gaehtgens

    Scandinavian Journal of Clinical and Laboratory Investigation. Supplementum
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Red blood cell adaptation to flow is mainly viscous, not elastic. Increased membrane shear stiffness had minimal impact on cell shape and flow behavior, challenging previous assumptions.

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    Area of Science:

    • Biophysics
    • Hematology
    • Cellular Mechanics

    Background:

    • Red blood cell (RBC) deformation is crucial for navigating microcirculation.
    • Previous studies suggested membrane elasticity significantly influences RBC shape adaptation.
    • Understanding the mechanics of RBC flow is vital for diagnosing and treating blood flow disorders.

    Purpose of the Study:

    • To investigate the primary mechanisms of red blood cell adaptation to fluid flow.
    • To determine the relative contributions of viscous and elastic properties to RBC deformation.
    • To assess the impact of altered membrane shear elasticity on RBC rheology.

    Main Methods:

    • Microscopic flow visualization techniques were employed to observe RBCs under shear stress.
    • The spectrin network within RBC membranes was cross-linked using DIAMIDE to experimentally increase shear modulus.

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  • Rheological behavior of both normal and treated RBCs was evaluated in vitro and in vivo.

    • Main Results:

    • RBC deformation in flow is primarily a continuous viscous process, not elastic.
    • Cytoplasmic fluidity and surface-area-to-volume ratio are key determinants of adaptation.
    • Increasing membrane shear elasticity up to 25-fold with DIAMIDE resulted in minimal changes to cell shape and rheological behavior.
    • This suggests membrane shear modulus is less significant than previously thought.

    Conclusions:

    • Red blood cell adaptation to flow is dominated by viscous properties of the cytoplasm and cell geometry.
    • Membrane shear elasticity plays a less critical role in RBC deformation and flow than commonly believed.
    • These findings refine our understanding of red blood cell mechanics and have implications for diseases affecting blood flow.