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pubmed-article:1370178pubmed:abstractTextThe healing of articular surface defects has been studied with conventional histology, which relies on the staining of the extracellular matrix to identify the phenotype of the cells present. A chondrospecific cellular marker would be useful. S-100 protein has been found in all chondroid tissues studied, and we evaluated its usefulness in the study of articular cartilage repair. Full-thickness rabbit femoral condylar defects were made, and the specimens were studied at serial time intervals. S-100 protein staining positively showed chondroid cells in the 7- and 14-day specimens, which were not identifiable by conventional techniques. At 30 and 60 days, an S-100 positive band of cells separated a deep safranin-O positive hypertrophic layer from a fibrocellular surface layer. At 120 days, the presence of S-100 protein identified cells with chondrogenic potential, and the lack of S-100 protein in other cells embedded in conventionally stained matrix suggested that these cells were no longer of a chondroid phenotype. The presence of S-100 protein-identified chondroid cells early in the repair process when the cells had not begun to synthesize conventionally stainable matrix and the lack of S-100 protein in cells late in the repair positively identified a phenotypic change earlier than conventional histology.lld:pubmed
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pubmed-article:1370178pubmed:authorpubmed-author:WolffD ADAlld:pubmed
pubmed-article:1370178pubmed:authorpubmed-author:GoldbergV MVMlld:pubmed
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pubmed-article:1370178pubmed:pagination49-57lld:pubmed
pubmed-article:1370178pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:1370178pubmed:year1992lld:pubmed
pubmed-article:1370178pubmed:articleTitleS-100 protein immunostaining identifies cells expressing a chondrocytic phenotype during articular cartilage repair.lld:pubmed
pubmed-article:1370178pubmed:affiliationDepartment of Orthopaedics, Case Western Reserve University, Cleveland, Ohio.lld:pubmed
pubmed-article:1370178pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1370178pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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