Repeated freezing procedures preserve structural and functional properties of amniotic membrane for application in ophthalmology

Download statistics - Document (COUNTER):

Pogozhykh, O.; Hofmann, N.; Gryshkov, O.; von Kaisenberg, C.; Mueller, M. et al.: Repeated freezing procedures preserve structural and functional properties of amniotic membrane for application in ophthalmology. In: International Journal of Molecular Sciences (IJMS) 21 (2020), Nr. 11, 4029. DOI: https://doi.org/10.3390/ijms21114029

Repository version

To cite the version in the repository, please use this identifier: https://doi.org/10.15488/10703

Selected time period:

year: 
month: 

Sum total of downloads: 69




Thumbnail
Abstract: 
For decades, the unique regenerative properties of the human amniotic membrane (hAM) have been successfully utilized in ophthalmology. As a directly applied biomaterial, the hAM should be available in a ready to use manner in clinical settings. However, an extended period of time is obligatory for performing quality and safety tests. Hence, the low temperature storage of the hAM is a virtually inevitable step in the chain from donor retrieval to patient application. At the same time, the impact of subzero temperatures carries an increased risk of irreversible alterations of the structure and composition of biological objects. In the present study, we performed a comprehensive analysis of the hAM as a medicinal product; this is intended for a novel strategy of application in ophthalmology requiring a GMP production protocol including double freezing– thawing cycles. We compared clinically relevant parameters, such as levels of growth factors and extracellular matrix proteins content, morphology, ultrastructure and mechanical properties, before and after one and two freezing cycles. It was found that epidermal growth factor (EGF), transforming growth factor beta 1 (TGF-ß1), hepatocyte growth factor (HGF), basic fibroblast growth factor (bFGF), hyaluronic acid, and laminin could be detected in all studied conditions without significant differences. Additionally, histological and ultrastructure analysis, as well as transparency and mechanical tests, demonstrated that properties of the hAM required to support therapeutic efficacy in ophthalmology are not impaired by dual freezing. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2020
Appears in Collections:Fakultät für Maschinenbau

distribution of downloads over the selected time period:

downloads by country:

pos. country downloads
total perc.
1 image of flag of Germany Germany 38 55.07%
2 image of flag of United States United States 15 21.74%
3 image of flag of China China 5 7.25%
4 image of flag of Indonesia Indonesia 2 2.90%
5 image of flag of No geo information available No geo information available 1 1.45%
6 image of flag of Ukraine Ukraine 1 1.45%
7 image of flag of Taiwan Taiwan 1 1.45%
8 image of flag of Russian Federation Russian Federation 1 1.45%
9 image of flag of Kazakhstan Kazakhstan 1 1.45%
10 image of flag of Iraq Iraq 1 1.45%
    other countries 3 4.35%

Further download figures and rankings:


Hinweis

Zur Erhebung der Downloadstatistiken kommen entsprechend dem „COUNTER Code of Practice for e-Resources“ international anerkannte Regeln und Normen zur Anwendung. COUNTER ist eine internationale Non-Profit-Organisation, in der Bibliotheksverbände, Datenbankanbieter und Verlage gemeinsam an Standards zur Erhebung, Speicherung und Verarbeitung von Nutzungsdaten elektronischer Ressourcen arbeiten, welche so Objektivität und Vergleichbarkeit gewährleisten sollen. Es werden hierbei ausschließlich Zugriffe auf die entsprechenden Volltexte ausgewertet, keine Aufrufe der Website an sich.

Search the repository


Browse