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Related Experiment Videos

The structure and function of the myocardial cell surface

G A Langer

    The American Journal of Physiology
    |November 1, 1978
    PubMed
    Summary

    The myocardial cell glycocalyx, rich in sialic acid, regulates calcium entry. Preserving this structure is vital for preventing uncontrolled calcium influx and maintaining cardiac function.

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    Area of Science:

    • Cardiovascular Biology
    • Cell Membrane Physiology
    • Biochemistry

    Background:

    • The myocardial cell surface features a glycocalyx, a 50nm thick coat external to the lipid bilayer.
    • This coat comprises two layers: the surface coat (SC) and the external lamina (EL).
    • Both layers possess abundant negatively charged sites, with sialic acid being a key component.

    Purpose of the Study:

    • To investigate the role of the myocardial glycocalyx, particularly sialic acid, in regulating sarcolemmal calcium permeability.
    • To understand the contribution of surface-charged sites to calcium binding and its implications in excitation-contraction coupling.

    Main Methods:

    • Investigated the effects of sialic acid removal on sarcolemmal ion permeability.
    • Analyzed the role of negatively charged sites and bound calcium in cellular calcium dynamics.

    Main Results:

    • Removal of sialic acid significantly increased sarcolemmal calcium permeability without affecting potassium permeability.
    • Sialic acid contributes to negatively charged sites crucial for cationic binding, including calcium.
    • Bound calcium at the cell surface is in rapid equilibrium with extracellular calcium and is a likely source for sarcolemmal calcium influx.

    Conclusions:

    • The myocardial glycocalyx, through its sialic acid content, plays a critical role in controlling calcium permeability.
    • Maintaining the integrity of the glycocalyx is essential for preventing excessive calcium entry into myocardial cells.
    • Surface-bound calcium, regulated by the glycocalyx, is important for excitation-contraction coupling and acts as the immediate source of calcium crossing the sarcolemma.

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