Effects of in vitro alpha-particle irradiation on osteogenic bone marrow cultures.
Murine bone marrow contains osteogenic precursor cells that undergo differentiation during in vitro cultivation. In vitro these cells are potential target cells for alpha-irradiation-induced bone tumour formation. Under defined tissue culture conditions these differentiating cells were directly exposed to alpha-particle irradiation from the radon daughter 210Po. Po deposits in soft tissue and it was shown to be associated with marrow cells and with the extracellular marrow tissue formed in vitro. These differentiating marrow cultures showed high sensitivity to alpha-irradiation. Cell death was observed at 210Po concentrations in tissue culture medium (TCM) > 7 Bq 210Po/ml. At lower concentrations (between 1 and 5 Bq 210Po per ml TCM) proliferation was enhanced as measured by uptake of 3H-thymidine, also differentiation was stimulated as measured by alkaline phosphatase activity and incorporation of 3H-proline in newly synthesized collagen. At several times of culture, the association of 210Po with the extracellular matrix and cells was measured. These retention data enabled us to calculate the daily alpha-particle fluence. At 1 Bq 210Po present per ml tissue culture, a daily alpha-particle fluence as low as 3-6 per 1000 cells seemed very efficient in changing the expression of osteogenic differentiation of marrow cells.
Schoeters
G E
GE
VITO-Flemish Institute for Technological Research, Department of Environment, Mol, Belgium.
Vander Plaetse
F
F
van den Heuvel
R L
RL
D016475:3T3 Cells; D000512:Alpha Particles; D000818:Animals; D001853:Bone Marrow / Q000502:physiology* / Q000528:radiation effects*; D001854:Bone Marrow Cells; D001859:Bone Neoplasms / Q000209:etiology; D002454:Cell Differentiation / Q000528:radiation effects; D002471:Cell Transformation, Neoplastic / Q000528:radiation effects; D002472:Cell Transformation, Viral; D002478:Cells, Cultured; D003470:Culture Media; D004307:Dose-Response Relationship, Radiation; D051379:Mice; D008807:Mice, Inbred BALB C; D009381:Neoplasms, Radiation-Induced / Q000209:etiology; D010006:Osteoblasts / Q000166:cytology / Q000528:radiation effects; D010012:Osteogenesis / Q000528:radiation effects*; D011059:Polonium; D013234:Stem Cells / Q000528:radiation effects; D017154:Stromal Cells / Q000166:cytology / Q000528:radiation effects
D003470:Culture Media; D011059:Polonium