title: Microvessel networks [corrected] pre-formed in artificial clinical grade dermal substitutes in vitro using cells from haematopoietic tissues.
abstract: Forming a microcirculation is critical for vascularisation of artificial skin substitutes. One strategy to improve speed of grafting is to pre-form microvascular networks in the substitute before applying to a wound. For clinical application, this requires sufficient functional endothelial cell numbers. In vitro endothelial colony forming cells (ECFCs) derived cells were expanded from cord and adult blood donations and co-cultured with human dermal fibroblasts or bone marrow mesenchymal stem/stromal cells to form microvascular networks in the presence or absence of dermal substitutes which are in clinical use. The number of endothelial cells generated ranged from 1.03×10(9) to 2.18×10(11) from 10 adult blood donations and 1×10(12) to 1.76×10(13) from 6 cord blood units after 50 days in culture. Two adult donations failed to generate ECFCs. Both cord and adult blood cells formed 2D microvascular networks in vitro, although there was a significant difference in the functional capacity of adult and cord blood ECFCs. While co-culture of the latter within dermal substitutes Matriderm or Integra demonstrated the formation of 3D microvascular networks penetrating 100μm, enhanced expansion, while maintaining functional capacity, of adult blood cells is required for fully pre-vascularising the clinical grade acellular dermal substitutes used here prior to applying these to burns.
authors.affiliation: Stem Cell Research Laboratory, NHS Blood and Transplant, John Radcliffe Hospital, Oxford OX3 9DU, UK.
authors.forename: Athanassios
authors.initials: A
authors.lastname: Athanassopoulos
authors.forename: Grigorios
authors.initials: G
authors.lastname: Tsaknakis
authors.forename: Sarah E
authors.initials: SE
authors.lastname: Newey
authors.forename: Adrian L
authors.initials: AL
authors.lastname: Harris
authors.forename: Jennifer
authors.initials: J
authors.lastname: Kean
authors.forename: Michael P
authors.initials: MP
authors.lastname: Tyler
authors.forename: Suzanne M
authors.initials: SM
authors.lastname: Watt
mesh_terms: D000328:Adult; D002056:Burns / Q000628:therapy*; D002478:Cells, Cultured; D018920:Coculture Techniques; D004730:Endothelium, Vascular / Q000166:cytology*; D005240:Feasibility Studies; D005260:Female; D005312:Fetal Blood / Q000166:cytology; D006801:Humans; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology; D055806:Microvessels / Q000254:growth & development*; D008875:Middle Aged; D012867:Skin / Q000098:blood supply*; D017768:Skin, Artificial; D013234:Stem Cells / Q000166:cytology; D017154:Stromal Cells / Q000166:cytology; D023822:Tissue Engineering / Q000379:methods