Bone morphogenetic protein-2 does not alter the differentiation pathway of committed progenitors of osteoblasts and chondroblasts

Cell and Tissue Research
M KomakiT Suda

Abstract

Bone morphogenetic proteins (BMPs) induce cartilage and bone formation at both bony and non-bony sites. We examined the possibility whether BMP-2 induces differentiation of osteoblast progenitors into chondroblast lineage cells using organ culture and cell culture prepared from the calvaria of newborn mouse. BMP-2 stimulated alkaline phosphatase activity (a marker of osteoblasts) and induced positive alcian blue staining (a marker of chondroblasts) in a dose- and time-dependent manner in cell cultures isolated from the whole calvaria. BMP-2 also increased the number of round-shaped cells in the cell cultures, which expressed type II collagen. Histologically, the calvaria consisted of not only bone, but also cartilaginous tissues stained with alcian blue, which were located along the endocranial surface of the parietal and occipital bones. When the calvariae were organ-cultured in the presence of BMP-2, the territory of the cartilaginous tissue was markedly increased, and covered most of the occipital bone. A histological examination of the cultured calvariae showed that the bony region of the occipital bone remained unchanged, while the cartilaginous region expanded independent of the bony region. BMP-2 increased the number of ...Continue Reading

Citations

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