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- W1967224852 abstract "Hematopoietic colonies were studied by light microscopy in the marrow of alternate fraction x-irradiated mice (C576J/B1) to investigate the microenvironmental organization of marrow and identify early hematopoietic cell-stromal cell interactions. Undifferentiated colonies (UC) were detected at 3 days postirradiation, showed a marked predilection for bone surfaces, and disappeared as differentiated colonies developed. Some UC occurred along marrow arteries. Neutrophilic granulocyte colonies (GC) occurred in all areas at 3 days but grew rapidly only subosteally. Few eosinophilic colonies (GCe) occurred. Erythrocytic colonies (EC) appeared at 4 days as dispersed populations of motile cells within a localized area of marrow; these tended to proliferate initially in intermediate and central marrow zones. Macrophage colonies (M phi C) of two subtypes were detected, peaking in relative frequency at 4 days. These appeared active in stromal repair and monocytopoiesis. Megakaryocyte colonies (MC) originated along bone and differentiated away from bone. From 3-5 days, the frequency of GC greater than UC greater than M phi C much greater than MC approximately equal to GCe. All colony types except UC, M phi C, and central GC increased in size and became mixed in differentiation by 12-14 days. For several weeks, however, erythropoiesis concentrated toward central areas, whereas granulopoiesis and thrombopoiesis concentrated along bone. Some mixed colonies showed an abrupt transition from erythrocytic, centrally, to granulocytic, subosteally. These results were interpreted as evidence that in x-irradiated marrow: (1) hematopoietic microenvironments (HMs) for stem-cell proliferation and commitment to differentiation, with the possible exception of HMs determining erythroid differentiation, occur in endosteal and periarterial regions; (2) a proliferative and/or chemotactic stimulus to erythroid progenitors exists in intermediate and central marrow regions; and (3) some subosteal regions may exclude erythropoiesis, or preferentially support nonerythroid differentiation. Elaborate associations occurred between macrophages and early UC, GC, and EC, but not MC hematopoietic cells. UC and GC often associated with osteoclasts. Reticular and other fibroblastic cells associated with the cells of all colony types." @default.
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- W1967224852 date "1983-04-01" @default.
- W1967224852 modified "2023-09-28" @default.
- W1967224852 title "Studies on the organization and regeneration of bone marrow: Origin, growth, and differentiation of endocloned hematopoietic colonies" @default.
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- W1967224852 doi "https://doi.org/10.1002/aja.1001660402" @default.
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