title: Shelf-life evaluation of bilayered human skin equivalent, MyDerm™.
abstract: Skin plays an important role in defense against infection and other harmful biological agents. Due to its fragile structure, skin can be easily damaged by heat, chemicals, traumatic injuries and diseases. An autologous bilayered human skin equivalent, MyDerm™, was engineered to provide a living skin substitute to treat critical skin loss. However, one of the disadvantages of living skin substitute is its short shelf-life, hence limiting its distribution worldwide. The aim of this study was to evaluate the shelf-life of MyDerm™ through assessment of cell morphology, cell viability, population doubling time and functional gene expression levels before transplantation. Skin samples were digested with 0.6% Collagenase Type I followed by epithelial cells dissociation with TrypLE Select. Dermal fibroblasts and keratinocytes were culture-expanded to obtain sufficient cells for MyDerm™ construction. MyDerm™ was constructed with plasma-fibrin as temporary biomaterial and evaluated at 0, 24, 48 and 72 hours after storage at 4°C for its shelf-life determination. The morphology of skin cells derived from MyDerm™ remained unchanged across storage times. Cells harvested from MyDerm™ after storage appeared in good viability (90.5%±2.7% to 94.9%±1.6%) and had short population doubling time (58.4±8.7 to 76.9±19 hours). The modest drop in cell viability and increased in population doubling time at longer storage duration did not demonstrate a significant difference. Gene expression for CK10, CK14 and COL III were also comparable between different storage times. In conclusion, MyDerm™ can be stored in basal medium at 4°C for at least 72 hours before transplantation without compromising its functionality.
authors.affiliation: Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia.
authors.forename: Wan Tai
authors.initials: WT
authors.lastname: Seet
authors.forename: Maarof
authors.initials: M
authors.lastname: Manira
authors.forename: Manira
authors.initials: M
authors.lastname: Maarof
authors.forename: Khairoji
authors.initials: K
authors.lastname: Khairul Anuar
authors.forename: Kien-Hui
authors.initials: KH
authors.lastname: Chua
authors.forename: Abdul Wahab
authors.initials: AW
authors.lastname: Ahmad Irfan
authors.forename: Min Hwei
authors.initials: MH
authors.lastname: Ng
authors.forename: Bin Saim
authors.initials: BS
authors.lastname: Aminuddin
authors.forename: Bt Hj Idrus
authors.initials: BH
authors.lastname: Ruszymah
mesh_terms: D002470:Cell Survival / Q000187:drug effects; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D015603:Keratinocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D012867:Skin / Q000166:cytology*; D016038:Skin Transplantation; D017768:Skin, Artificial; D013696:Temperature; D013997:Time Factors