title: Type X collagen expression and hypertrophic differentiation in chondrogenic neoplasias.
abstract: Little is known about matrix biochemistry and cell differentiation patterns in chondrogenic neoplasms. This is the first description of the focal expression of collagen type X by neoplastic chondrocytes in situ and its incorporation into the extracellular matrix of cartilaginous tumors. This shows that neoplastic chondrocytes have the potential to undergo the full program of cell differentiation, including hypertrophy, comparable to their physiological counterparts in the growth plate. However, only in benign osteochondromas was a zonal expression of type X collagen found similar to that observed in the growth plate, where the cells immediately above the ossification frontier are selectively positive for type X collagen. In enchondromas and chondrosarcomas, the expression was randomly distributed within the tumors. Surprisingly, in less differentiated chondrosarcomas with spindle-shaped cells and non-cartilaginous extracellular matrix, exceptional expression of collagen type X was observed, which indicates potential uncoupling of collagen type X expression from the differentiated chondrocytic phenotype in neoplastic chondrocytes in vivo.
authors.affiliation: Institute of Experimental Medicine and Connective Tissue Research, University of Erlangen-Nürnberg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Aigner
authors.forename: S
authors.initials: S
authors.lastname: Frischholz
authors.forename: S
authors.initials: S
authors.lastname: Dertinger
authors.forename: F
authors.initials: F
authors.lastname: Beier
authors.forename: I
authors.initials: I
authors.lastname: Girkontaité
authors.forename: K
authors.initials: K
authors.lastname: von der Mark
mesh_terms: D001859:Bone Neoplasms / Q000378:metabolism*; D002454:Cell Differentiation; D002812:Chondroma / Q000378:metabolism*; D002813:Chondrosarcoma / Q000378:metabolism*; D003094:Collagen / Q000378:metabolism*; D006801:Humans; D006984:Hypertrophy / Q000378:metabolism; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D015831:Osteochondroma / Q000378:metabolism*; D009418:S100 Proteins / Q000378:metabolism
chemical_list: D009418:S100 Proteins; D003094:Collagen