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The Journal of Immunology, Vol 137, Issue 2 563-570, Copyright © 1986 by American Association of Immunologists
ARTICLES |
BD Chen and CR Clark
The effect of interleukin 3 (IL 3) on regulation of macrophage proliferation was examined. Although IL 3 alone stimulates the colony formation in bone marrow cells, it fails to stimulate the colony formation by both peritoneal exudate macrophages (PEM) and blood monocytes. However, IL 3 greatly enhances the proliferative capacity of both PEM and monocytes in responding to suboptimal concentrations of CSF-1. At supraoptimal concentrations of CSF-1, IL 3 did not increase the number of colonies, but greatly increased colony size. Kinetic studies showed that IL 3 enhances CSF-1-induced macrophage proliferation by shortening the cell doubling time. Monocytes were more sensitive to the action of IL 3 and possessed higher proliferative potential than PEM. Binding studies with radioactive labeled CSF-1 (125I-CSF-1) showed that IL 3 treatment induced an increased expression of CSF-1 receptor activity by PEM which appears to be a result of increased number of available receptor sites. The effect of IL 3 on the expression of receptor activity is both dose- and time-dependent. IL 3 also augments the rate of receptor-mediated CSF-1 endocytosis by PEM which appears to be a direct result of increased expression of CSF-1 binding sites. These results demonstrate that, in addition to stimulating the growth and differentiation of several blood cell lineages by hemopoietic stem cells, IL 3 also possesses the ability to modulate CSF-1 receptors, thereby affecting proliferation of more mature blood monocytes and tissue-derived macrophages.
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