title: Haemopoietic inductive capacity of irradiated stromal cell layers in human micro long-term bone marrow cultures.
abstract: In a micro long-term bone marrow culture (LTBMC) system the effects of irradiation on confluent stromal cell layers were studied. In order to individually analyse the number of granulocyte-macrophage colony-forming cells (GM-CFC) per LTBMC a miniaturized human GM-CFC assay was established. The normalized GM-CFC numbers in the micro-assay compared well with data by the conventional GM-CFC assay. Pre-formed stromal cell layers were irradiated with doses up to 20 Gy and subsequently recharged with allogeneic bone marrow cells (BMC). Immediately before recharge the BMC were stromal cell-depleted by nylon wool filtration. When stromal cell-depleted BMC were inoculated on empty culture dishes, in vitro haemopoiesis rapidly declined. Sustained GM-CFC production, however, was seen when these cells were used as a second inoculum. It is concluded that irradiation doses of up to 20 Gy do not cause alteration of the haemopoietic inductive capacity of confluent stromal cell layers.
authors.affiliation: Gesellschaft für Strahlen- und Umweltforschung, Institut für Experimentelle Hämatologie, München, F.R.G.
authors.forename: P
authors.initials: P
authors.lastname: Brühl
authors.forename: H G
authors.initials: HG
authors.lastname: Mergenthaler
authors.forename: P
authors.initials: P
authors.lastname: Dörmer
mesh_terms: D001853:Bone Marrow / Q000528:radiation effects; D001854:Bone Marrow Cells; D002448:Cell Adhesion; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D006410:Hematopoiesis / Q000528:radiation effects*; D006412:Hematopoietic Stem Cells / Q000166:cytology; D006801:Humans