Interleukin 3 (IL 3) regulates the in vitro proliferation of both blood monocytes and peritoneal exudate macrophages: synergism between a macrophage lineage-specific colony-stimulating factor (CSF-1) and IL 3
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 (/sup 125/I-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.
- Research Organization:
- Wayne State Univ. School of Medicine, Detroit, MI
- OSTI ID:
- 5389633
- Journal Information:
- J. Immunol.; (United States), Journal Name: J. Immunol.; (United States) Vol. 137:2; ISSN JOIMA
- Country of Publication:
- United States
- Language:
- English
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59 BASIC BIOLOGICAL SCIENCES
ANIMAL CELLS
BETA DECAY RADIOISOTOPES
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BODY FLUIDS
CELL PROLIFERATION
COLONY FORMATION
CONNECTIVE TISSUE CELLS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
GROWTH FACTORS
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LEUKOCYTES
LYMPHOKINES
MACROPHAGES
MATERIALS
MEMBRANE PROTEINS
MITOGENS
MONOCYTES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
PHAGOCYTES
PROTEINS
RADIOISOTOPES
REACTION KINETICS
RECEPTORS
SOMATIC CELLS
STIMULATION
SYNERGISM
TRACER TECHNIQUES