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Related Experiment Videos

Cryoprotectant-treated myocardium evaluation.

L J Ramazzotto, R Engstrom

    Cryobiology
    |August 1, 1976
    PubMed
    Summary

    Dimethyl sulfoxide/glycerol cryoprotectants showed cellular damage in unfrozen and frozen rat hearts. Freezing exacerbated ultrastructural damage and reduced key enzyme activity, impacting tissue viability.

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    Area of Science:

    • Cardiology
    • Cell Biology
    • Cryobiology

    Background:

    • Cryoprotective agents like dimethyl sulfoxide (DMSO) and glycerol are crucial for preserving biological tissues.
    • Understanding the cellular effects of these agents, especially under freezing conditions, is vital for optimizing preservation techniques.

    Purpose of the Study:

    • To evaluate the histological and ultrastructural damage in rat hearts treated with varying concentrations of DMSO/glycerol.
    • To assess the impact of freezing and thawing on cellular integrity, glycogen depletion, and enzyme activity.

    Main Methods:

    • Whole rat hearts were treated with 5%, 10%, or 15% (v/v) DMSO/glycerol.
    • Samples were either frozen in liquid nitrogen or kept unfrozen.
    • Histological, histochemical, and electron microscopy techniques were used to examine ventricular tissue.

    Main Results:

    • Unfrozen groups showed early signs of cellular degeneration and ischemia, including glycogen depletion and sarcoplasmic changes.
    • Frozen groups exhibited similar damage, but with more severe and extensive ultrastructural alterations.
    • Key enzyme sites (alkaline phosphatase, succinic dehydrogenase) were reduced or absent in frozen specimens.

    Conclusions:

    • DMSO/glycerol treatment, particularly when combined with freezing, induces significant cellular damage in rat hearts.
    • Freezing intensifies ultrastructural damage and impairs critical enzyme functions, compromising tissue viability.

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