title: Early B-lymphocyte precursor cells in mouse bone marrow: subosteal localization of B220+ cells during postirradiation regeneration.
abstract: The localization of early B-lymphocyte precursor cells in the bone marrow of young mice has been studied during recovery from sublethal whole body gamma-irradiation (150 rad). Initial studies by double immunofluorescence labeling of the B-lineage-associated cell surface glycoprotein, B220, and of mu heavy chains in bone marrow cell suspensions, demonstrated a sequential wave of regeneration of early B precursor cells, pre-B cells, and B cells. Early B precursor cells expressing B220 but not mu chains were enriched at 1-3 days following irradiation. After in vivo administration of 125I-labeled monoclonal antibody 14.8 to detect B220+ cells in situ, light and electron microscope radioautography of femoral bone marrow sections revealed concentrations of labeled B220+ cells located peripherally near the cortical bone at 1-3 days following irradiation, increasing in numbers in more central areas by 5-7 days. Proliferative B220+ precursor cells were found within layers of bone-lining cells and in a subosteal area characterized by a prominent electron-dense extracellular matrix, often associated with stromal reticular cells. The results demonstrate that the precursor cells that are active in the bone marrow early in the recovery of B lymphopoiesis after gamma-irradiation are located both within and near the endosteum of the surrounding bone. The distinctive extracellular matrix and stromal cell associations noted in this region may contribute to a supportive local microenvironment for early hemopoietic progenitor cells.
authors.affiliation: Department of Anatomy, McGill University, Montreal, Quebec, Canada.
authors.forename: K
authors.initials: K
authors.lastname: Jacobsen
authors.forename: J
authors.initials: J
authors.lastname: Tepper
authors.forename: D G
authors.initials: DG
authors.lastname: Osmond
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology* / Q000528:radiation effects; D001853:Bone Marrow / Q000502:physiology / Q000528:radiation effects; D001854:Bone Marrow Cells; D001861:Bone Regeneration; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D013234:Stem Cells / Q000166:cytology* / Q000528:radiation effects