title: Are surface antigens suited to verify the redifferentiation potential and culture purity of human chondrocytes in cell-based implants.
abstract: Cell expansion in vitro is a prequisite to obtain a sufficient quantity of cells for cell-based cartilage repair of articular cartilage lesions. During this process verification of redifferentiation potential of highly expanded chondrocytes is required. Furthermore, cellular impurities of chondrocyte cultures have to be excluded. For this purpose, redifferentiation of expanded human chondrocytes in passage 3 or 5 was initiated in bioresorbable polyglycolic acid-fibrin (PGA-fibrin) scaffolds and selected potential markers were analysed during the process of cell expansion and redifferentiation. Chondrocyte expansion was accompanied by a decrease of collagen type II and COMP and an increase of collagen type I expression indicating cell dedifferentiation. Redifferentiation of chondrocytes in PGA-fibrin scaffolds was accompanied by an increase of collagen II/I ratio. Flow cytometric analyses revealed that in contrast to CD44 and CD49e, CD63 and CD166 showed significant changes in the number of positive cells during redifferentiation. CD14 and CD45 are not expressed by chondrocytes and are therefore possible candidates to detect specifically monocytes or haematopoetic cells in chondrocyte cultures. Characterization of surface antigen expression revealed two promising candidates (CD63 and CD166) to describe the process of redifferentiation, while CD14 and CD45 are suitable markers to exclude impurities by monocytes or haematopoetic cells.
authors.affiliation: TransTissue Technologies GmbH, Berlin, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Krüger
authors.affiliation: TransTissue Technologies GmbH, Berlin, Germany; Department of Rheumatology, Laboratory for Tissue Engineering, Charité - Universitätsmedizin Berlin, Berlin, Germany.
authors.forename: J P
authors.initials: JP
authors.lastname: Krüger
authors.affiliation: Department of Orthopedics, Experimental Rheumatology Unit, Friedrich Schiller University, Jena, Germany.
authors.forename: R W
authors.initials: RW
authors.lastname: Kinne
authors.affiliation: TransTissue Technologies GmbH, Berlin, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Kaps
authors.affiliation: TransTissue Technologies GmbH, Berlin, Germany; Department of Rheumatology, Laboratory for Tissue Engineering, Charité - Universitätsmedizin Berlin, Berlin, Germany. Electronic address: michaela.endres@transtissue.com.
authors.forename: M
authors.initials: M
authors.lastname: Endres
mesh_terms: D000368:Aged; D000954:Antigens, Surface / Q000276:immunology*; D002358:Cartilage, Articular / Q000166:cytology* / Q000276:immunology; D018929:Cell Culture Techniques; D054337:Cell Dedifferentiation / Q000502:physiology*; D002454:Cell Differentiation / Q000502:physiology*; D049109:Cell Proliferation / Q000502:physiology; D002478:Cells, Cultured; D019902:Chondrocytes / Q000166:cytology*; D024043:Collagen Type II / Q000378:metabolism; D005109:Extracellular Matrix / Q000276:immunology; D006801:Humans; D008875:Middle Aged; D019736:Prostheses and Implants; D023822:Tissue Engineering / Q000379:methods
chemical_list: D000954:Antigens, Surface; D024043:Collagen Type II
keywords: Cartilage regeneration; Cartilage repair; Cell impurities; Cell potency; Chondrocyte redifferentiation; Surface antigen expression