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Effect of pore size and cross-linking of a novel collagen-elastin dermal substitute on wound healing

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Abstract

Collagen-elastin (CE) scaffolds are frequently used for dermal replacement in the treatment of full-thickness skin defects such as burn wounds. But little is known about the optimal pore size and level of cross-linking. Different formulations of dermal substitutes with unidirectional pores were tested in porcine full-thickness wounds in combination with autologous split skin mesh grafts (SSG). Effect on wound healing was evaluated both macro- and microscopically. CE scaffolds with a pore size of 80 or 100 μm resulted in good wound healing after one-stage grafting. Application of scaffolds with a larger average pore size (120 μm) resulted in more myofibroblasts and more foreign body giant cells (FBGC). Moderate crosslinking impaired wound healing as it resulted in more wound contraction, more FBGC and increased epidermal thickness compared to no cross-linking. In addition, take rate and redness were negatively affected compared to SSG only. Vascularization and the number of myofibroblasts were not affected by cross-linking. Surprisingly, stability of cross-linked scaffolds was not increased in the wound environment, in contrast to in vitro results. Cross-linking reduced the proliferation of fibroblasts in vitro, which might explain the reduced clinical outcome. The non-cross-linked CE substitute with unidirectional pores allowed one-stage grafting of SSG, resulting in good wound healing. In addition, only a very mild foreign body reaction was observed. Cross-linking of CE scaffolds negatively affected wound healing on several important parameters. The optimal non-cross-linked CE substitute is a promising candidate for future clinical evaluation.

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Acknowledgments

This work was supported by the Dutch Burns Foundation in the Netherlands (Grant #06-203).

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Authors and Affiliations

  1. Association of Dutch Burn Centres, PO Box 15, 1991 AJ, Beverwijk, The Netherlands

    Bouke K. H. L. Boekema, Marcel Vlig, Esther Middelkoop & Magda M. W. Ulrich

  2. Matricel GmbH, Herzogenrath, Germany

    Leon Olde Damink, Lizette Eummelen & Anne V. Bühren

  3. VU University Medical Center, Amsterdam, The Netherlands

    Esther Middelkoop & Magda M. W. Ulrich

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  1. Bouke K. H. L. Boekema
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  2. Marcel Vlig
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  3. Leon Olde Damink
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Correspondence to Bouke K. H. L. Boekema.

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Boekema, B.K.H.L., Vlig, M., Olde Damink, L. et al. Effect of pore size and cross-linking of a novel collagen-elastin dermal substitute on wound healing. J Mater Sci: Mater Med 25, 423–433 (2014). https://doi.org/10.1007/s10856-013-5075-2

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