title: Improved proliferation and differentiation capacity of human mesenchymal stromal cells cultured with basement-membrane extracellular matrix proteins.
abstract: OBJECTIVE
  In vitro cultured mesenchymal stromal cells (MSC) are characterized by a short proliferative lifespan, an increasing loss of proliferation capacity and progressive reduction of differentiation potential. Laminin-1, laminin-5, collagen IV and fibronectin are important constituents of the basement membrane extracellular matrix (ECM) that are involved in a variety of cellular activities, including cell attachment and motility.
  
  
  RESULTS
  The in vitro proliferation capacity of MSC was significantly improved when the cells were incubated in the presence of basement membrane ECM proteins. For example, a mixture of proteins improved proliferation capacity 250-fold in comparison with standard conditions after five passages. Furthermore, in colony-forming unit-fibroblast (CFU-F) assays colony numbers and size were significantly extended. Blocking specific integrin cell-surface receptors, positive effects on the proliferation capacity of MSC were inhibited. Additionally, when MSC were co-cultivated with ECM proteins, cells maintained their multipotential differentiation capacity throughout many culture passages in comparison with cells cultivated on plastic. However, expansion of MSC on laminin-5 suppressed any subsequent chondrogenic differentiation.
  
  
  CONCLUSIONS
  Our results suggest that expansion of bone marrow-derived MSC in the presence of ECM proteins is a powerful approach for generating large numbers of MSC, showing a prolonged capacity to differentiate into mesodermal cell lineages, with the exception of the lack of chondrogenesis by using laminin-5 coating.
authors.affiliation: Medical Department I, Division of Nephrology and Transplantation Unit, University of Luebeck, Luebeck, Germany. Ulrich.Lindner@uk-sh.de
authors.forename: Ulrich
authors.initials: U
authors.lastname: Lindner
authors.forename: Jan
authors.initials: J
authors.lastname: Kramer
authors.forename: Jochen
authors.initials: J
authors.lastname: Behrends
authors.forename: Birgit
authors.initials: B
authors.lastname: Driller
authors.forename: Nils-Ole
authors.initials: NO
authors.lastname: Wendler
authors.forename: Florian
authors.initials: F
authors.lastname: Boehrnsen
authors.forename: Jürgen
authors.initials: J
authors.lastname: Rohwedel
authors.forename: Peter
authors.initials: P
authors.lastname: Schlenke
mesh_terms: D019138:Antibodies, Blocking / Q000494:pharmacology; D001485:Basement Membrane / Q000378:metabolism; D001854:Bone Marrow Cells / Q000166:cytology / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000276:immunology / Q000378:metabolism*; D002452:Cell Count; D002454:Cell Differentiation / Q000187:drug effects; D019070:Cell Lineage; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D020219:Chondrogenesis; D003114:Colony-Forming Units Assay; D016326:Extracellular Matrix Proteins / Q000276:immunology / Q000378:metabolism*; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000378:metabolism*; D017154:Stromal Cells / Q000166:cytology / Q000378:metabolism*; D000097794:Kalinin
chemical_list: D019138:Antibodies, Blocking; D015815:Cell Adhesion Molecules; D016326:Extracellular Matrix Proteins; D000097794:Kalinin