Colocalization of Noggin and Bone Morphogenetic Protein-4 During Fracture Healing
作者:Yasuo Yoshimura、Shintaro Nomura、Satoshi Kawasaki、Takahiro Tsutsumimoto、Tominaga Shimizu、Kunio Takaoka
DOI:10.1359/jbmr.2001.16.5.876
日期:——
The regulation of callus formation during fracture repair involves the coordinate expression of growth factors and their receptors. This article describes the temporal and spatial expression of noggin gene, an antagonist to bone morphogenetic protein (BMP), during the fracture repair process. Noggin expression was examined by means of Northern blotting and in situ hybridization and compared with the expression pattern of BMP‐4 in a model of fracture repair in adult mice. Expression levels of noggin messenger RNA (mRNA) were enhanced in the early phase of fracture callus formation. The localization of the noggin mRNA was similar to that of BMP‐4 mRNA. Distinct noggin mRNA signals were located predominantly in cells lining the periosteum and the cortical endosteum near the fracture site at 2 days after fracture. At 5, 10, and 21 days after fracture, noggin mRNA was detected in the chondrocytes and osteoblasts in the newly formed callus. The pattern of localization was indistinguishable from that of BMP‐4. These results suggest that the noggin/BMP‐4 balance could be an important factor in the regulation of callus formation during fracture healing.
骨折修复过程中愈伤组织形成的调节涉及生长因子及其受体的协调表达。本文描述了骨形态发生蛋白(BMP)拮抗剂 noggin 基因在骨折修复过程中的时空表达。通过 Northern 印迹和原位杂交检查 Noggin 表达,并与成年小鼠骨折修复模型中 BMP-4 的表达模式进行比较。 noggin 信使 RNA (mRNA) 的表达水平在骨折愈伤组织形成的早期阶段增强。 noggin mRNA 的定位与 BMP-4 mRNA 的定位相似。骨折后 2 天,明显的 noggin mRNA 信号主要位于骨折部位附近的骨膜和皮质内膜细胞中。骨折后 5、10 和 21 天,在新形成的愈伤组织中的软骨细胞和成骨细胞中检测到 noggin mRNA。定位模式与 BMP-4 没有区别。这些结果表明头蛋白/BMP-4 平衡可能是骨折愈合过程中骨痂形成调节的重要因素。