title: Reconstruction of basement membrane in skin equivalent; role of laminin-1.
abstract: To reconstruct the basement membrane in a skin equivalent, the epidermodermal interface was coated with porcine type IV collagen and mouse laminin-1 at various ratios before keratinocyte seeding. Laminin-1, a component of the basement membrane, induced massive infiltration of keratinocytes into the dermal equivalent, while type IV collagen induced discrete demarcation between dermal and epidermal compartments without any infiltrating cells. Immunohistochemical staining indicated that the laminin-induced infiltrating cells expressed endogenous type IV collagens at the cell periphery, which were not incorporated into the basement membrane structure. The infiltrating cells did not express fibronectin receptor alpha5beta1 integrin but showed MMP-9 secretion and cell surface associated MMP-2. However, when laminin-1 was preincubated with type IV collagen, laminin-1-induced keratinocyte infiltration as well as MMP-9 induction were almost completely suppressed to basal levels. Therefore, replenishment of the type IV collagen lattice seemed to cause laminin-stimulated cells to anchor to the lattice, in a similar manner to the basal cells on the basement membrane of normal skin. Our study suggests that the molar ratio of basement membrane components may determine the behavior of basal cells within the wound healing microenvironment, which is probably regulated either by extracellular matrix deposition or degradation.
authors.affiliation: Laboratory of Tissue Engineering, Korea Cancer Center Hospital, Seoul.
authors.forename: J Y
authors.initials: JY
authors.lastname: Yi
authors.forename: Y H
authors.initials: YH
authors.lastname: Yoon
authors.forename: H S
authors.initials: HS
authors.lastname: Park
authors.forename: C H
authors.initials: CH
authors.lastname: Kim
authors.forename: C H
authors.initials: CH
authors.lastname: Kim
authors.forename: H J
authors.initials: HJ
authors.lastname: Kang
authors.forename: E
authors.initials: E
authors.lastname: Lee
authors.forename: Y Y
authors.initials: YY
authors.lastname: Kim
authors.forename: Y J
authors.initials: YJ
authors.lastname: Jin
authors.forename: T H
authors.initials: TH
authors.lastname: Kim
authors.forename: Y S
authors.initials: YS
authors.lastname: Son
mesh_terms: D016475:3T3 Cells; D000818:Animals; D000954:Antigens, Surface / Q000502:physiology; D001485:Basement Membrane / Q000502:physiology*; D003094:Collagen; D024141:Collagen Type IV / Q000502:physiology; D005353:Fibronectins / Q000494:pharmacology; D039161:Integrin alpha6beta4; D016023:Integrins / Q000502:physiology; D015603:Keratinocytes / Q000187:drug effects / Q000502:physiology; D007797:Laminin / Q000037:antagonists & inhibitors / Q000502:physiology*; D020778:Matrix Metalloproteinase 2 / Q000502:physiology; D020780:Matrix Metalloproteinase 9 / Q000502:physiology; D051379:Mice; D017768:Skin, Artificial; D013552:Swine
chemical_list: D000954:Antigens, Surface; D024141:Collagen Type IV; D005353:Fibronectins; D039161:Integrin alpha6beta4; D016023:Integrins; D007797:Laminin; C121346:laminin 1; D003094:Collagen; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9