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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Immunohistochemical localization of fibroblast growth factor-2 in normal and brachymorphic mouse tibial growth plate and articular cartilage.

Epiphyses of the proximal tibiae of 7-week-old normal and homozygous recessive brachymorphic mice (bm/bm) were immunostained using a monoclonal antibody to basic fibroblast growth factor to determine its expression in growth plate cartilage, osteoblasts on the surfaces of the primary spongiosa and articular cartilage. In the normal growth plate the immunoreactive factor was present in chondrocytes of the proliferating and upper hypertrophic zones but absent from lower hypertrophic chondrocytes. Immunostaining was present only in the territorial extracellular matrix immediately adjacent to the chondrocytes of the proliferating and upper hypertrophic zones. Osteoblasts of the primary spongiosa stained heavily in normal mice. Strong staining was observed in intermediate zone articular chondrocytes. Cells in the superficial layer of articular cartilage were unstained. The extracellular matrix of the articular cartilage was completely free of immunostaining. In contrast, the reduced size of bm/bm growth plates was accompanied by significantly reduced staining intensity in proliferating and upper hypertrophic chondrocytes, and staining was absent from the territorial extracellular matrix of all zones of the bm/bm growth plate. Osteoblasts of the primary spongiosa of bm/bm mice stained less than those of normal mice. Articular cartilage chondrocytes in the intermediate zone stained with less intensity in bm/bm mice, and the cells of the superficial layer were unstained. The extracellular matrix of bm/bm articular cartilage was completely free of staining. Brachymorphic epiphyseal growth plate and articular chondrocytes, and osteoblasts in the primary spongiosa, express reduced amounts of immunoreactive fibroblast growth factor-2. This phenotypical characteristic may be associated with abnormal endochondral ossification and development of bone in brachymorphic mice.[1]


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