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Cryopreservation for corneal storage.

John Armitage

    Developments in Ophthalmology
    |June 5, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Cryopreservation offers long-term storage for cells and tissues, but freezing can damage corneal endothelium. Lower cooling rates and non-permeating cryoprotectants show promise for improved corneal cryopreservation.

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    Area of Science:

    • Ophthalmology
    • Cell Biology
    • Biomedical Engineering

    Background:

    • Cryopreservation is the sole method for long-term storage of living cells and tissues.
    • While corneal grafts have been successfully cryopreserved, freezing damages the corneal endothelium.
    • Cellular damage during freezing occurs via intracellular ice formation or solution effects.

    Purpose of the Study:

    • To explore methods for improving corneal cryopreservation.
    • To investigate the mechanisms of freezing injury in corneal tissues.
    • To evaluate alternative cryopreservation techniques for ocular tissues.

    Main Methods:

    • Analysis of intracellular freezing and solution effect injury in isolated cells.
    • Examination of factors affecting cell susceptibility to freezing in tissues.

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  • Assessment of lower cooling rates for corneal freezing.
  • Evaluation of vitrification challenges and non-permeating cryoprotectants for cornea.

    • Main Results:

    • Intracellular freezing at high cooling rates and solution effects at low rates damage cells.
    • Tissues exhibit increased susceptibility to intracellular freezing compared to isolated cells.
    • Lower cooling rates mitigate damage when freezing cornea.
    • Vitrification requires high solute concentrations, posing challenges.
    • Promising results obtained using non-permeating cryoprotectants for corneal freezing.

    Conclusions:

    • Optimizing cooling rates is crucial for minimizing freezing injury in corneal cryopreservation.
    • Non-permeating cryoprotectants offer a potential pathway to simpler and more effective corneal cryopreservation methods.
    • Further research into vitrification and alternative cryoprotective agents is warranted for advancing long-term tissue storage.