title: Friend virus-infected long-term bone marrow cultures produce colony stimulating factor dependent and independent granulocyte-macrophage progenitor cells for over four years in vitro.
abstract: C3H/HeJ mouse long-term bone marrow cultures infected at initiation with a cloned polycythemic strain of Friend spleen focus forming virus in a cloned N-tropic murine leukemia virus helper virus coat, persistently produced: colony-forming unit spleen (CFUs) for 55 weeks that formed macroscopic spleen colonies in syngeneic or allogeneic C57B10.Br/J mice; and L-cell or WEHI-3 cell conditioned medium-dependent granulocyte-macrophage colony forming unit culture (GM-CFUc); and morphologically normal granulocytes for over 245 weeks. Colony stimulating factor (CSF)-independent colony forming progenitor cells were first detectably produced in vitro at 75 weeks, and when subcultured generated karyotypically distinct permanent factor-independent tumorigenic cell lines. Nonadherent cells removed from long-term marrow cultures at 19 but not at 77 weeks reconstituted donor origin hematopoiesis in C57B10.Br/J mice as measured by B-cell lineage surface immunoglobin allotype. Nonadherent cells removed at 77 weeks produced lethal splenomegaly and marrow infiltration with culture origin cells in C57B10.Br/J mice. Despite generation of clonal malignant cell lines, L-cell DSF (CSF-1, M-CSF) responsive GM-CFUc that were simultaneously produced over 4 years in the same long-term marrow cultures, grew to 7 day colonies in semisolid medium and terminally differentiated. Thus, adherent stromal cells in Friend virus-infected long-term bone marrow cultures simultaneously support CSF-responsive and malignant CSF-independent hematopoietic progenitor cells.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002454:Cell Differentiation; D002472:Cell Transformation, Viral; D002478:Cells, Cultured; D003115:Colony-Stimulating Factors / Q000494:pharmacology; D005622:Friend murine leukemia virus; D006098:Granulocytes / Q000166:cytology*; D006410:Hematopoiesis; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D007126:Immunoglobulin Allotypes / Q000032:analysis; D008264:Macrophages / Q000166:cytology*; D051379:Mice; D011947:Receptors, Antigen, B-Cell / Q000032:analysis; D013997:Time Factors
chemical_list: D003115:Colony-Stimulating Factors; D007126:Immunoglobulin Allotypes; D011947:Receptors, Antigen, B-Cell