PMID: 8595766Mar 1, 1996Paper

Bone morphogenetic protein-induced heterotopic bone in osteopetrosis

Clinical Orthopaedics and Related Research
K MiyazawaM R Urist

Abstract

The objectives of the present research on the osteopetrotic mouse are to investigate the factors influencing heterotopic bone development. The osteopetrotic mutant was deficient in macrophage colony stimulating factor and failed to activate functioning monocytes, macrophages, and osteoclasts. Macrophage colony stimulating factor deficiency also caused a heretofore undescribed delay in organization and absorption of hematomas resulting from surgical operations. Surgically implanted in a heterotopic site, bone morphogenetic protein induced approximately 10% more bone in osteopetrotic than littermate+/? mice. Radiographically, the heterotopic bone was at least 50% denser than new bone. The new bone was metachromatic or slightly basophilic rather than eosinophilic and undermined with large deposits of hypercalcified hypertrophic cartilage. Bone mineral in the osteopetrotic mouse was deposited in an apatite-like form with a higher calcium/phosphorus ratio than the bone of +/? littermates. High levels of alkaline phosphatase synthesis were sustained longer in the osteopetrotic mouse than in the +/? littermate. Tartrate resistant acid phosphatase synthesis was almost nil in osteopetrotic mice during the first 4 weeks, and thereafter a...Continue Reading

References

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