Xeno-free expansion of adult keratinocytes for clinical application: the use of human-derived feeder cells and serum

Perdita Cheshire, Aqila S. Zhafira, Ilia Banakh, Md Mostafizur Rahman, Irena Carmichael, Marisa Herson, Heather Cleland, Shiva Akbarzadeh

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

Cultured epithelial autograft (CEA) was the birth of skin tissue engineering and encompassed methodologies for the isolation and expansion of autologous basal keratinocytes for burn treatment that are still practiced at some specialised units around the world. One of the limitations of CEA, however, is the reliance on animal-derived material during the manufacturing process and despite all efforts to date, no xeno-free alternative with proven efficacy has been reported. Here, we investigate whether human-derived fibroblast feeder cells and human serum can sufficiently and effectively provide a suitable microenvironment for adult keratinocyte isolation and expansion. Human dermal fibroblasts and epidermal keratinocytes were isolated from discarded skin during abdominoplasty and breast reduction procedures and cultured in xeno-free conditions. We report that these xeno-free adult keratinocytes form similar numbers of colony-forming units as those cultured using the Green’s methods; however, xeno-free keratinocytes express lower levels of α6 integrin (CD49f; a progenitor and stem cell marker). We identified IL-8 as a potential growth factor secreted by adult human fibroblasts that may enhance keratinocyte colony formation in human serum. Finally, we propose a step-by-step xeno-free isolation and cultivation methodology for adult keratinocytes that can be tested further in serial cultivation for clinical application.

Original languageEnglish
Pages (from-to)389-400
Number of pages12
JournalCell and Tissue Research
Volume376
Issue number3
DOIs
Publication statusPublished - 5 Jun 2019

Keywords

  • Adult keratinocytes
  • Burns
  • CD49f (α6 integrin)
  • CEA
  • IL-8 (CXCL8)
  • Skin tissue engineering

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