Increased granulopoiesis after sequential administration of transforming growth factor-beta 1 and granulocyte-macrophage colony-stimulating factor.
Transforming growth factor-beta 1 (TGF-beta 1) is an inhibitor of the growth and differentiation of immature hematopoietic progenitors in vitro; however, we have demonstrated that TGF-beta 1 can promote granulopoiesis in the presence of granulocyte-macrophage colony-stimulating factor (GM-CSF) in vitro. We therefore examined the effect of the combined administration of TGF-beta 1 and GM-CSF in vivo. First, TGF-beta 1 enhanced the specific binding of GM-CSF (2.0-fold) on bone marrow cells, reaching a maximum 40 hours after injection, while the specific binding of interleukin-3 (IL-3) was unaffected. Using GM-CSF-specific binding to determine the optimal regimen for cytokine administration in vivo, we found that the administration of TGF-beta 1 and GM-CSF in sequence increased myelopoiesis. Total numbers of colony-forming units-granulocyte/macrophage (CFU-GM) and myeloblasts per femur were increased above the level obtained with the simultaneous injection of TGF-beta 1 plus GM-CSF, GM-CSF alone or TGF-beta 1 alone. Further, the sequential administration of TGF-beta 1 and GM-CSF resulted in enhanced numbers of mature granulocytes in both the bone marrow and peripheral blood. In contrast, the sequential combination of TGF-beta 1 and GM-CSF did not enhance the numbers or increase the recovery of erythroid cells in the bone marrow. These results show that TGF-beta 1 in vivo as in vitro has a multifunctional effect on bone marrow progenitors, and by using an optimal combination of TGF-beta 1 and GM-CSF in vivo, one can selectively increase both the central and peripheral granulopoietic compartments.
Hestdal
K
K
Preclinical Evaluation Laboratory, Program Resources, Inc./DynCorp, Frederick, MD 21702-1201.
Jacobsen
S E
SE
Ruscetti
F W
FW
Longo
D L
DL
Boone
T C
TC
Keller
J R
JR
D000818:Animals; D001853:Bone Marrow / Q000187:drug effects / Q000378:metabolism; D001854:Bone Marrow Cells; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D004912:Erythrocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D005260:Female; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D006098:Granulocytes / Q000166:cytology* / Q000187:drug effects / Q000502:physiology; D006410:Hematopoiesis / Q000187:drug effects / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D011485:Protein Binding; D013997:Time Factors; D016212:Transforming Growth Factor beta / Q000494:pharmacology*
D016212:Transforming Growth Factor beta; D016178:Granulocyte-Macrophage Colony-Stimulating Factor