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Effect of PEG Molecular Weight and Volume Ratio of Chitosan/PEG and Silk Fibroin on Physicomechanical Properties of Chitosan/PEG-SF Scaffold as a Bio-mimetic Substrate in Skin-tissue Engineering Applications

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Abstract

Tissue engineering provides new approaches to improve skin lesions. However, cell differentiation onto the engineered substrate with the skin-like pattern is the main challenge. Here we have tried to fabricate such the substrate via studying the change in polymers ratios and molecular weight, and grafting scaffold with silk fibroin (SF) biomaterial. To this end, chitosan and PEG were mixed at the volume ratios of 25:75, 50:50, and 65:35, and samples were lyophilized by the freeze-drying method. Based on the result, the ratio of 65:35 indicated better physicomechanical properties than two other scaffolds. Afterward, Chi/PEG scaffolds were prepared via mixing chitosan/PEG with (65:35) and PEG molecular weights of 2000, 4000, 6000, 10000 Da. It was found that the increase of PEG molecular weight (>4000) was led to the reduction in tensile strength and elongation of the scaffold network. Hence, PEG4000 was selected as the optimum molecular weight to design SF-grafted Chi/PEG scaffold. Therefore, Chi/PEG4000-SF scaffold was designed to evaluate the volume ratio of SF (1 %, 3 %, 5 %) and compare data with the decellularized dermis. The results showed Chi/PEG4000-SF(3%) scaffold not only was led to the same elongation as Chi/PEG-SF(5%) scaffold but also created the dermis-like modulus. Moreover, Chi/PEG-SF provided higher expression level of keratinocytes (bio-mimetic pattern) than decellularized dermis due to better physicomechanical properties. Hence, it seems that engineered scaffolds can be a more suitable option than native tissue (due to removal of limitations such as donor sites and immunogenicity, and their mechanical properties). This study can provide novel insight into the better design of skin-engineered scaffolds.

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Acknowledgements

We wish to acknowledge the help provided by the School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences to finalize this project with ethics code IR.SBMU.REC.1398.069.

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Authors and Affiliations

  1. Department of Nanobiotechnology, Pasteur Institute of Iran, Tehran, 1316943551, Iran

    Azadeh Izadyari Aghmiuni

  2. Medical Nanotechnology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, 1985711151, Iran

    Saeed Heidari Keshel & Masoud Soleimani

  3. Department of Tissue Engineering and Applied Cell Science, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, 19839-63113, Iran

    Saeed Heidari Keshel, Arash Khojasteh & Masoud Soleimani

  4. Proteomics Research Center, Shahid Beheshti University of Medical Sciences, Tehran, 19839-63113, Iran

    Mostafa Rezaei-tavirani

  5. Department of Biomedical and Electronics Engineering, School of Engineering, University of Bradford, Bradford, BD7 IDP, UK

    Farshid Sefat

  6. Interdisciplinary Research Centre in Polymer Science & Technology, University of Bradford, Bradford, BD7 IDP, UK

    Farshid Sefat

  7. Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, 19839-63113, Iran

    Arash Khojasteh

  8. Department of Oculo-Facial Plastic Surgery, Farabi Hospital, Tehran University of Medical Sciences, Tehran, 1336616351, Iran

    Farzad Pakdel

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  1. Azadeh Izadyari Aghmiuni
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Correspondence to Azadeh Izadyari Aghmiuni or Saeed Heidari Keshel.

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Aghmiuni, A.I., Keshel, S.H., Rezaei-tavirani, M. et al. Effect of PEG Molecular Weight and Volume Ratio of Chitosan/PEG and Silk Fibroin on Physicomechanical Properties of Chitosan/PEG-SF Scaffold as a Bio-mimetic Substrate in Skin-tissue Engineering Applications. Fibers Polym 23, 3358–3368 (2022). https://doi.org/10.1007/s12221-022-4579-0

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