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Quantifying the ultrastructure changes of air-dried and irradiated human amniotic membrane using atomic force microscopy: a preliminary study

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Abstract

Air-dried and sterilized amnion has been widely used as a dressing to treat burn and partial thickness wounds. Sterilisation at the standard dose of 25 kGy was reported to cause changes in the morphological structure as observed under the scanning electron microscope. This study aimed to quantify the changes in the ultrastructure of the air-dried amnion after gamma-irradiated at several doses by using atomic force microscope. Human placentae were retrieved from mothers who had undergone cesarean elective surgery. Amnion separated from chorion was processed and air-dried for 16 h. It was cut into 10 × 10 mm, individually packed and exposed to gamma irradiation at 5, 15, 25 and 35 kGy. Changes in the ultrastructural images of the amnion were quantified in term of diameter of the epithelial cells, size of the intercellular gap and membrane surface roughness. The longest diameter of the amnion cells reduced significantly after radiation (p < 0.01) however the effect was not dose dependent. No significant changes in the shortest diameter after radiation, except at 35 kGy which decreased significantly when compared to 5 kGy (p < 0.01). The size of the irradiated air-dried amnion cells reduced in the same direction without affecting the gross ultrastructure. At 15 kGy the intercellular gap decreased significantly (p < 0.01) with Ra and Rq, values reflecting surface roughness, were significantly the highest (p < 0.01). Changes in the ultrastructure quantified by using atomic force microscope could complement results from other microscopic techniques.

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Acknowledgements

This study was supported by Bone Bank Internal Fund and University Malaya Research Grant (RG542-13HTM) and HIR-MoE Grant; UM.C/625/1/HIR/MOHE/CHAN/03-A000003-50001). The authors thanked Ms Nurhafizatul Nadia Hanafi and Mr Mohd Khalil Salleh for their technical assistance in the study.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, National Orthopaedic Centre of Excellence for Research and Learning (NOCERAL), Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia

    S. Mohd, N. Yusof, S. Ramalingam, T. Kamarul & A. Mansor

  2. Advanced Imaging Laboratory, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia

    M. I. Ghazali

  3. Department of Obstetrics and Gynaecology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia

    S. Sulaiman

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  1. S. Mohd
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Correspondence to S. Mohd.

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Mohd, S., Ghazali, M.I., Yusof, N. et al. Quantifying the ultrastructure changes of air-dried and irradiated human amniotic membrane using atomic force microscopy: a preliminary study. Cell Tissue Bank 19, 613–622 (2018). https://doi.org/10.1007/s10561-018-9711-4

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  • DOI: https://doi.org/10.1007/s10561-018-9711-4

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