title: Histological characterization of bone marrow in ectopic bone, induced by devitalized Saos-2 human osteosarcoma cells.
abstract: Devitalized Saos-2, cultured human osteosarcoma cells, or guanidinium-hydrochloride (GuHCl) extracts of these cells, induce ectopic bone and marrow formation when implanted subcutaneously in Nu/Nu mice. The aim of the present study was to characterize the bone marrow induced by Saos-2 cell extracts, specifically to determine which of the four major hematopoietic cell lineages: erythropoietic, granulopoietic, lymphopoietic and megakaryocytic, are induced by Saos-2 cell derivatives.
  
  
  METHODS
  Immunohistochemical localization of specific antigens was used to determine the presence of each major cell type (glycophorin A for erythropoietic, neutrophil elastase for granulopoietic, factor-VIII related antigen for megakaryocytes, and CD79a for B lymphocytes).
  
  
  RESULTS
  Standard H & E stains confirmed the presence of normally organized apparently complete bone marrow within all newly induced bone at 3 weeks post-implantation of devitalized Saos-2 cells. Immunohistochemistry confirmed the presence of erythropoietic cells, granulopoietic cells, megakaryocytes and B lymphocytes in the ectopic marrow.
  
  
  CONCLUSIONS
  Saos-2 cells (freeze-dried) or their extracts, implanted subcutaneously into Nu/Nu mice, can induce normal marrow that is host-derived, and contains all major hematopoietic cell lineages.
  
  
  CONCLUSIONS
  Saos-2 induced marrow could potentially restore deficient marrow and promote bone repair.
authors: Departments of Pathology and Laboratory Medicine, The University of Kansas Medical Center Kansas City, KS, USA.
authors: Niru N
authors: NN
authors: Nahar
authors: Sarah E
authors: SE
authors: Tague
authors: Jinxi
authors: J
authors: Wang
authors: Marsha
authors: M
authors: Danley
authors: Rama
authors: R
authors: Garimella
authors: H Clarke
authors: HC
authors: Anderson
keywords: Bone marrow induction; bone tumors; hematopoiesis; lineage-specific biomarkers; osteosarcoma
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