Abstract
The presence of pre-existing basement membrane (BM) components improves the morphogenesis of epidermis and BM in constructing a human living skin-equivalent (LSE). De-epithelialized amniotic membrane (AM) retains key BM components. We have therefore investigated the usefulness of AM for constructing LSE. De-epithelialized AM was overlaid on type I collagen gel embedded with fibroblasts. Normal human keratinocytes (NHKs) were then seeded onto the epithelial side of the AM to construct an AM-LSE. A conventional LSE was constructed by seeding NHKs on a fibroblast-populated type I collagen gel. When the keratinocytes reached confluence, the LSE was lifted to the air-liquid interface and cultured for up to 3 weeks. Samples were harvested at various times and investigated morphologically, immunohistochemically, and ultrastructurally. In AM-LSE, the epidermis was better stratified, with more compact, polarized, columnar basal cells, and the expression of differentiation and proliferation markers was more similar to that of normal human skin than was that of LSE without AM. A more continuous BM and better-developed hemidesmosomes were found in AM-LSE. The epidermis of AM-LSE outgrew much faster than that of LSE without AM. When transplanted onto nude mice, both LSEs took well; however, the AM-LSE graft showed better morphogenesis of the epidermis, BM, and hemidesmosomes. The better epidermal morphology and better-developed BM in AM-LSE in vitro and in vivo indicates its superiority over LSE without AM for clinical applications.
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We thank Teruko Tsuda, Eriko Tan, and Wakana Itoh for technical assistance.
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This work was partly supported by Health Sciences Research Grants for Research on Specific Diseases from the Ministry of Health, Labor, and Welfare of Japan (to K.H.) and a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (to K.H. and Y.S.).
L. Yang and Y. Shirakata contributed equally to this work.
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Yang, L., Shirakata, Y., Shudou, M. et al. New skin-equivalent model from de-epithelialized amnion membrane. Cell Tissue Res 326, 69–77 (2006). https://doi.org/10.1007/s00441-006-0208-2
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DOI: https://doi.org/10.1007/s00441-006-0208-2