This editorial by Urist reviews the emerging molecular biology of bone morphogenetic protein. It frames a companion chick embryo study showing BMP-2 and BMP-4 direct axial skeletal patterning. The piece positions BMP as a morphogen operating during early skeletal development.
The clinical hook here is heterotopic ossification prophylaxis. Urist explains that BMP-driven bone formation passes through a morphogenetic phase in the first 72 hours, before cells commit to cartilage or bone.
During that window, NSAIDs, irradiation, and BrdU can block bone morphogenesis. Once cells pass into cytodifferentiation, the same agents no longer work. This is exactly why HO prophylaxis after hip surgery or trauma must be started early.
The editorial also grounds the concept of BMP as a morphogen acting in a concentration gradient, which underlies later rhBMP-2 and OP-1 (BMP-7) use in spinal fusion and nonunions. Remember the functional definition: BMP is the only molecule that induces heterotopic bone when implanted in muscle, switching perivascular mesenchymal cells from fibroprogenitor to osteoprogenitor fate.
This editorial by Urist reviews the emerging molecular biology of bone morphogenetic protein. It frames a companion chick embryo study showing BMP-2 and BMP-4 direct axial skeletal patterning. The piece positions BMP as a morphogen operating during early skeletal development.
The clinical hook here is heterotopic ossification prophylaxis. Urist explains that BMP-driven bone formation passes through a morphogenetic phase in the first 72 hours, before cells commit to cartilage or bone.
During that window, NSAIDs, irradiation, and BrdU can block bone morphogenesis. Once cells pass into cytodifferentiation, the same agents no longer work. This is exactly why HO prophylaxis after hip surgery or trauma must be started early.
The editorial also grounds the concept of BMP as a morphogen acting in a concentration gradient, which underlies later rhBMP-2 and OP-1 (BMP-7) use in spinal fusion and nonunions. Remember the functional definition: BMP is the only molecule that induces heterotopic bone when implanted in muscle, switching perivascular mesenchymal cells from fibroprogenitor to osteoprogenitor fate.