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Synergistic Myelopoietic Actions in vivo after Administration to Mice of Combinations of Purified Natural Murine Colony-Stimulating Factor 1, Recombinant Murine Interleukin 3, and Recombinant Murine Granulocyte/Macrophage Colony-Stimulating Factor

Hal E. Broxmeyer, Douglas E. Williams, Giao Hangoc, Scott Cooper, Steven Gillis, Richard K. Shadduck and David C. Bicknell
Proceedings of the National Academy of Sciences of the United States of America
Vol. 84, No. 11 (Jun. 1, 1987), pp. 3871-3875
Stable URL: http://www.jstor.org/stable/29501
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Synergistic Myelopoietic Actions in vivo after Administration to Mice of Combinations of Purified Natural Murine Colony-Stimulating Factor 1, Recombinant Murine Interleukin 3, and Recombinant Murine Granulocyte/Macrophage Colony-Stimulating Factor
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Abstract

Combinations of low dosages of purified murine hematopoietic colony-stimulating factors (CSFs)--L-cell CSF type 1 (CSF-1), recombinant interleukin 3 (IL-3), and recombinant granulocyte/macrophage CSF (GM-CSF)--were compared with single CSFs for their influence on the cycling rates and numbers of bone marrow granulocyte/macrophage, erythroid, and multipotential progenitor cells in vivo in mice pretreated with human lactoferrin. Lactoferrin was used to enhance detection of the stimulating effects of exogenously administered CSFs. Concentrations of CSFs that were not active in vivo when given alone were active when administered together with other types of CSF. The concentrations of CSF-1, IL-3, and GM-CSF needed to increase progenitor cell cycling rates were reduced by factors of 40-200, 10-50, and 40->400, respectively; the concentrations needed to increase progenitor cell numbers were reduced by factors of 40-500 (CSF-1), 20-80 (IL-3), and >40->200 (GM-CSF) when these forms of CSFs were administered in combination with low dosages of one of the other forms of CSFs. The results demonstrate that different CSFs can synergize when administered in vivo to increase the cycling rates and numbers of marrow hematopoietic progenitor cells. These findings may be of relevance physiologically to the regulation of myeloid blood cell production by CSFs.

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