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Dried amniotic membrane (AM) offers logistical advantages for ophthalmic surgery. Optimized drying with lyoprotectants enhances structural properties and biochemical stability, making it a superior substrate for corneal epithelial cell expansion and wound healing compared to cryopreserved AM.

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Area of Science:

  • Ophthalmology
  • Biomaterials Science
  • Tissue Engineering

Background:

  • Cryopreserved amniotic membrane (AM) is used in ophthalmic surgery, but presents logistical challenges.
  • Preservation methods significantly impact AM's biochemical and physical properties, influencing clinical outcomes.
  • Dried AM offers potential logistical advantages over cryopreserved AM.

Purpose of the Study:

  • To investigate the biochemical and structural effects of drying AM with and without saccharide lyoprotectants.
  • To compare the biocompatibility of dried AM with cryopreserved AM.
  • To assess the impact of preservation on AM's biological factor retention and release.

Main Methods:

  • Amniotic membrane (AM) was preserved via cryopreservation or drying, with or without trehalose/raffinose and epigallocatechin (EGCG).
  • Structural analysis used electron microscopy; biological factors were quantified using immunoassays and immunofluorescence.
  • Biocompatibility was assessed through cell proliferation, cytotoxicity, apoptosis, and migration assays using corneal epithelial cells (CECs) and keratocytes.

Main Results:

  • Drying reduced epithelial devitalization compared to cryopreservation; lyoprotectants further minimized cellular damage.
  • Dried AM, especially with trehalose or raffinose, exhibited superior factor retention, bioavailability, and sustained in vitro release.
  • Dried AM with lyoprotectants supported enhanced CEC proliferation and wound healing, outperforming cryopreserved AM.

Conclusions:

  • A modified drying process yields optimized AM with improved structural and biochemical properties.
  • Optimized dried AM is a superior substrate for corneal epithelial cell expansion and wound healing compared to cryopreserved AM.
  • This stable, transportable dried AM has broad clinical and military applications.