Abstract
Purpose
Amniotic membrane (AM) is an essential tool in ocular surface reconstruction. In this study, we analyzed the differential effects of glycerol and straight storage at − 80 °C for up to 6 months on the structural, biological, and mechanical properties of amniotic membrane (AM).
Methods
Human placentae of 11 different subjects were analyzed. AMs were stored at − 80 °C, either with a 1:1 mixture of Dulbecco’s modified Eagle medium and glycerol (glycerol) or without any medium or additives (straight). Histological image analysis, tensile strength, cell viability, and basic fibroblast growth factor (bFGF) secretion were evaluated at 0.5, 1, 3, and 6 months.
Results
Histologically, neither glycerol nor straight storage significantly altered the epithelial or stromal structure of the AM. However, the cell number of the stroma was significantly reduced during the freezing process, independently of the storage method (p = 0.05–0.001). Tensile strength and Young’s modulus were not influenced by the storage method, but longer storage periods significantly increased the tensile strength of the AMs (p = 0.028). Cell viability was higher in glycerol rather than straight AM samples for up to 3 months of storage (p = 0.047–0.03). Secretion of bFGF at 3 months of storage was significantly higher in glycerol versus straight frozen AM samples (p = 0.04).
Discussion
Glycerol led to higher cell viability and higher bFGF secretion for up to 3 months of AM storage. However, no significant differences between the two methods were observed at 6 months of storage at − 80 °C.
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Acknowledgements
This work was supported by the Cornea Bank Aachen. We thank Anna Dobias and Claudia Werner for their assistance.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee (Medical Ethical Review Board, University RWTH Aachen (EK 178/15)) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Wagner, M., Walter, P., Salla, S. et al. Cryopreservation of amniotic membrane with and without glycerol additive. Graefes Arch Clin Exp Ophthalmol 256, 1117–1126 (2018). https://doi.org/10.1007/s00417-018-3973-1
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DOI: https://doi.org/10.1007/s00417-018-3973-1