Graefe's Archive for Clinical and Experimental Ophthalmology

, Volume 247, Issue 12, pp 1691–1700

Comparison of cryopreserved and air-dried human amniotic membrane for ophthalmologic applications

  • Henning Thomasen
  • Mikk Pauklin
  • Klaus-Peter Steuhl
  • Daniel Meller
Cornea

DOI: 10.1007/s00417-009-1162-y

Cite this article as:
Thomasen, H., Pauklin, M., Steuhl, KP. et al. Graefes Arch Clin Exp Ophthalmol (2009) 247: 1691. doi:10.1007/s00417-009-1162-y

Abstract

Background

Cryopreserved amniotic membrane (Cryo-AM) is widely used in ocular surface surgery because of its positive effect on wound healing and its anti-inflammatory properties. A new peracetic acid/ethanol sterilized air-dried amniotic membrane (AD-AM) recently became available which might be an alternative to Cryo-AM. Our aim was to compare AM preserved with both methods with regard to the release of wound-healing modulating proteins, the preservation of basement membrane components, and the ability to serve as a substrate for the cultivation of human limbal epithelial cells (HLECs).

Methods

Pieces of Cryo-AM and AD-AM from three different donors were incubated in DMEM for five days. The culture supernatant was collected after an incubation period of 0.1, 24, 48, 72 and 120 h; in the case of AD-AM, this period was extended up to 14 days. TIMP-1, IL-1ra, CTGF and TGF-β1 were detected in the culture supernatant using Western blotting. Twenty human limbal epithelial cultures were initiated on both AD- and Cryo-AM. The cultures were analyzed morphologically, and the outgrowth area was measured in 3-day intervals. Cryosections of Cryo- and AD-AM from three different donors were analyzed histochemically to detect the basement membrane components collagen IV, collagen VII, laminin, laminin 5 and fibronectin.

Results

The release of TIMP-1, IL-1ra and TGF-β1 from Cryo-AM was constant for the studied period. CTGF showed a stronger signal after 120 h. None of the analyzed proteins, except for a small amount of IL-1ra, could be detected in the supernatant of AD-AM. An outgrowth of HLEC was observed in all cultures on Cryo-AM, but in only 30% of cultures on AD-AM. The outgrowth area on Cryo-AM was at all time points significantly higher than on AD-AM (p < 0.0001). Collagen IV, -VII, laminins and fibronectin were detectable in the basement membrane of Cryo-AM, but only collagen IV and fibronectin in AD-AM.

Conclusions

Cryo-AM is a more suitable substrate for the cultivation of HLECs than AD-AM. The higher outgrowth rate of cultured limbal epithelium, release of intact soluble wound-healing modulating factors and a better preservation of basement membrane components suggest the superiority of Cryo-AM for use in ophthalmology in comparison to AD-AM.

Keywords

Amniotic membraneCryo-preservationAir-dryingGrowth factorsBasement membraneCell cultivation

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Henning Thomasen
    • 1
  • Mikk Pauklin
    • 1
    • 2
  • Klaus-Peter Steuhl
    • 1
  • Daniel Meller
    • 1
  1. 1.Department of OphthalmologyUniversity of Duisburg-EssenEssenGermany
  2. 2.Department of General and Molecular PathologyUniversity of TartuTartuEstonia