alexa The effects of preservation procedures on antibacterial property of amniotic membrane.
Molecular Biology

Molecular Biology

Journal of Cytology & Histology

Author(s): Tehrani FA, Ahmadiani A, Niknejad H

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Abstract Amniotic membrane (AM), the innermost layer of the fetal membranes, has been widely employed in the surgical reconstruction and tissue engineering. Expression of the antimicrobial peptides such as defensins, elafin and SLPI which are essential elements of the innate immune system results in antibacterial properties of the AM. Preservation is necessary to reach a ready-to-use source of the AM. However, these methods might change the properties of the AM. The aim of this study was to evaluate antibacterial properties of the AM after preservation. Antibacterial property of the fresh AM was compared with cryopreserved and freeze-dried AM by modified disk diffusion method. Staphylococcus aureus ATCC 25923, Pseudomonas aeruginosa ATCC 27853, Escherichia coli ATCC 25922 and two clinical isolated strains of E. coli were cultured in Mueller Hinton agar and a piece of the AM was placed on agar surface. After 24h incubation, the inhibition zone was measured. In addition, one of the most important antibacterial peptides, elafin, was measured by ELISA assay before and after preservations procedures. Antibacterial properties of the AM were maintained after cryopreservation and freeze-drying. However, the inhibition zone was depending on the bacterial strains. The cryopreservation and freeze-drying procedures significantly decreased elafin which shows that antibacterial property is not limited to the effects of amniotic cells and the other components such as extracellular matrix may contribute in antibacterial effects. The promising results of this study show that the preserved AM is a proper substitute of the fresh AM to be employed in clinical situations. Copyright © 2013 Elsevier Inc. All rights reserved. This article was published in Cryobiology and referenced in Journal of Cytology & Histology

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