Immunolocalization of BMPs, BMP antagonists, receptors, and effectors during fracture repair

Bone
Yan Yiu YuCéline Colnot

Abstract

Bone morphogenetic proteins (BMPs) are potent bone inducers used clinically to enhance fracture repair. BMPs have been shown to be produced in the fracture callus; however, the comparative expression of BMPs and BMP signaling components has only been partially examined at the cellular level. The aim of the present study was to establish a detailed spatiotemporal localization of BMPs and BMP signaling components in mouse models of stabilized and nonstabilized fractures. During healing of nonstabilized fractures, which occurs via endochondral ossification, BMP2, 3, 4, 5, and 8, noggin, BMPRIA, BMPRII, and pSmad 1/5/8 were immunolocalized in the activated periosteum as early as 3 days after fracture. BMP2, 4, 5, 6, 7, and 8 and noggin were also found in isolated inflammatory cells within granulation tissue during the early stages of repair, but not BMP receptors and effectors. During the soft callus phase of repair, all BMPs and BMP signaling components were detected in chondrocytes with various intensities of staining depending on the stage of chondrocyte differentiation and their location in the callus. The strongest staining was observed in hypertrophic chondrocytes with decreased intensity during the hard callus phase of repai...Continue Reading

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