Stimulator of proliferation of spleen colony-forming cells in T-cell deprived mice treated with cyclophosphamide or irradiation.
A role for T-cells in the regulation of CFU-S proliferation was investigated by determining the presence and activity of CFU-S proliferation stimulator (CFU-S stimulator) in adult mouse bone marrow after irradiation or cyclophosphamide (Cy) treatment. CBA mice previously deprived of T-cells by thymectomy, irradiation and bone marrow reconstitution (TIR) were thereafter treated with 4.5 Gy irradiation or 200 mg/kg Cy. Regenerating bone marrow cells of TIR and corresponding control mice after irradiation or Cy treatment produced CFU-S stimulator. The dose dependent increase in cytosine arabinoside cell death of normal bone marrow day 8 CFU-S was found when both CFU-S stimulators obtained after irradiation of TIR or corresponding control animals were tested. CFU-S stimulator activity in the bone marrow of TIR-Cy treated mice was also detected, but the effect was not dose-dependent. This was not related to the presence of an inhibitor of CFU-S proliferation. It appears that the CFU-S stimulator activity is not related to IL-6, IL-1 or IL-2, or to an inhibitor of IL-6 or IL-1 activity. The results demonstrate the existence of CFU-S proliferation stimulator unrelated to the two major monokines in the bone marrow of immunosuppressed mice.
Milenković
P
P
Institute for Medical Research, School of Medicine, University of Beograd, Yugoslavia.
Ivanović
Z
Z
Kataranovski
M
M
Lukić
M L
ML
D000818:Animals; D003520:Cyclophosphamide / Q000494:pharmacology*; D005720:Gamma Rays; D006410:Hematopoiesis / Q000502:physiology*; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000528:radiation effects; D051379:Mice; D008808:Mice, Inbred CBA; D013154:Spleen / Q000166:cytology* / Q000187:drug effects / Q000528:radiation effects; D013601:T-Lymphocytes / Q000502:physiology*; D013934:Thymectomy
D003520:Cyclophosphamide