Cytokines in the control of beta-2 microglobulin release. I. In vitro studies on various haemopoietic cells.
The role of cytokines in the control of beta-2 microglobulin release from various haemopoietic cells was studied in vitro. Cell types investigated were resting cells or blasts of the T cell, B cell or monocyte-macrophage lineage. Mediators used in these experiments were r-IFN-alpha 2c, r-IFN-gamma, r-TNF-alpha, r-TNF-beta, r-IL1, r-IL2 and r-GM-CSF. Nanogram amounts of some of these mediators strongly affected beta-2 microglobulin release in vitro. r-IFN-gamma, r-IFN-alpha 2c and r-IL2 strongly enhanced and r-TNF-alpha and r-TNF-beta occasionally increased shedding of beta-2 microglobulin. r-IL1 and high concentrations of r-IFN-alpha 2c were inhibitory, whereas r-GM-CSF was ineffective. The impact of antigenic stimulation on beta-2 microglobulin release in mixed lymphocyte culture (MLC) was also studied. Stimulation with alloantigens in MLC greatly enhanced beta-2 microglobulin shedding, and this enhancement could be inhibited by a monoclonal antibody neutralizing human IFN-gamma. Among the various cell types studied, macrophages derived from peripheral blood monocytes were most susceptible to cytokine-induced alterations of beta-2 microglobulin shedding. From these data, we conclude that cytokines not only control the static expression of beta-2 microglobulin on the surface of haemopoietic cells but also largely affect their shedding.
Nachbaur
K
K
Division of Clinical Immunobiology, University Hospital, Innsbruck, Austria.
Troppmair
J
J
Bieling
P
P
Kotlan
B
B
König
P
P
Huber
C
C
D000941:Antigens / Q000494:pharmacology; D001688:Biological Products / Q000494:pharmacology*; D002478:Cells, Cultured; D016207:Cytokines; D006412:Hematopoietic Stem Cells / Q000378:metabolism*; D006801:Humans; D007372:Interferons / Q000096:biosynthesis; D007963:Leukocytes, Mononuclear / Q000276:immunology; D007959:Lymphocyte Culture Test, Mixed; D001613:beta 2-Microglobulin / Q000378:metabolism*
D000941:Antigens; D001688:Biological Products; D016207:Cytokines; D001613:beta 2-Microglobulin; D007372:Interferons