Intrauterine Bone Marrow Transplantation in Osteogenesis Imperfecta Mice Yields Donor Osteoclasts and Osteomacs but Not Osteoblasts

In this article, Millard and colleagues show that intrauterine bone marrow transplantation in the oim/oim mouse model of osteogenesis imperfecta yields hematopoietic microchimerism in the absence of donor osteopoiesis or phenotypic improvement. Bone-associated donor cells were not bone-forming osteoblasts, but osteoclasts (bone resorbing cells of the hematopoietic lineage) and osteal macrophages (bone regulatory cells of the hematopoietic lineage).