The Journal of Immunology, Vol 145, Issue 1 167-176, Copyright © 1990 by American Association of Immunologists

ARTICLES

IL-3 and granulocyte-macrophage colony-stimulating factor stimulate two distinct phases of adhesion in human monocytes

MJ Elliott, MA Vadas, LG Cleland, JR Gamble and AF Lopez
Division of Human Immunology, Institute of Medical and Veterinary Science, Adelaide, South Australia.

IL-3 and granulocyte-macrophage CSF are hemopoietic growth factors involved in monocytopoiesis and functional stimulation of circulating blood monocytes. We demonstrate that both cytokines enhance the adhesion of purified human monocytes to cultured human umbilical vein endothelial cells and to plastic surfaces. The stimulation seen was biphasic: an early phase detectable by 10 min, and a late phase seen after 9 h of in vitro culture. IL-3- and granulocyte-macrophage-CSF- stimulated adhesion was seen at concentrations as low as 6 pM, with maximal monocyte adhesion of up to 60% seen at concentrations of 60 pM and above. Both phases of stimulated adhesion were partially inhibited by a monoclonal antibody to CD18, the common beta-chain of the leukocyte functional Ag family of adhesion molecules, but not by an antibody to CD11b, the alpha-chain of MAC-1. However, a difference in the mechanism by which the early and late phases of stimulated adhesion arise could be shown by the use of cycloheximide as an inhibitor of protein synthesis. Although the late phase was totally dependent on de novo protein synthesis, early phase adhesion was not inhibited by cycloheximide, suggesting receptor redistribution or conformational change as the mechanism mediating enhanced adhesion at this time. These findings may be relevant to the pathogenesis of inflammatory disease and may have implications for the clinical use of these cytokines.

This article has been cited by other articles:

				J. H. Von der Thusen, J. Kuiper, T. J. C. Van Berkel, and E. A. L. Biessen Interleukins in Atherosclerosis: Molecular Pathways and Therapeutic Potential Pharmacol. Rev., March 1, 2003; 55(1): 133 - 166. [Abstract] [Full Text] [PDF]

				C. Buelens, E. J. Bartholome, Z. Amraoui, M. Boutriaux, I. Salmon, K. Thielemans, F. Willems, and M. Goldman Interleukin-3 and interferon beta cooperate to induce differentiation of monocytes into dendritic cells with potent helper T-cell stimulatory properties Blood, February 1, 2002; 99(3): 993 - 998. [Abstract] [Full Text] [PDF]

				J. M. Woodcock, B. J. McClure, F. C. Stomski, M. J. Elliott, C. J. Bagley, and A. F. Lopez The Human Granulocyte-Macrophage Colony-Stimulating Factor (GM-CSF ) Receptor Exists as a Preformed Receptor Complex That Can Be Activated by GM-CSF, Interleukin-3, or Interleukin-5 Blood, October 15, 1997; 90(8): 3005 - 3017. [Abstract] [Full Text] [PDF]

				C. J. Bagley, J. Phillips, B. Cambareri, M. A. Vadas, and A. F. Lopez A Discontinuous Eight-Amino Acid Epitope in Human Interleukin-3 Binds the alpha -Chain of Its Receptor J. Biol. Chem., December 13, 1996; 271(50): 31922 - 31928. [Abstract] [Full Text] [PDF]