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The effect of interleukin 2 on Fc-gamma receptor function of human monocytes requires specific intercellular interaction
The effect of interleukin 2 on Fc-gamma receptor function of human monocytes requires specific intercellular interaction
- Source :
- Immunobiology. 179(1)
- Publication Year :
- 1989
-
Abstract
- We examined the effect of interleukin 2 (IL 2) on the capacity of human monocytes to secrete reactive oxygen species triggered via Fc-gamma receptor (Fc gamma R) function as measured by chemiluminescence (CL). IL 2 did not activate highly purified (hp) monocytes to respond to Fc gamma R-mediated phagocytic stimulation with an enhanced respiratory burst activity, unless low numbers of T lymphocytes had been cocultured with hp monocytes. The degree of monocyte activation in peripheral blood mononuclear cells (PBMC) by IL2 was dependent on T lymphocytes to monocytes ratios as well as on IL 2 concentrations. Optimal Fc gamma R function was detected with IL 2 concentrations of 60 to 600 U/ml and one to two T lymphocytes per monocyte, whereas higher cellular ratios were suppressive. Supernatants from IL 2-treated PBMC contained interferon-gamma (IFN-gamma) and monocyte activating factor (MAF) activity (= enhanced monocytic Fc gamma R mediated CL). The secretion of both cytokine activities was strongly enhanced by a cooperative function of monocytes. The correlation of IL 2-induced secretion of IFN-gamma and MAF activity was striking; however, monoclonal anti-IFN-gamma antibodies failed to abrogate IL 2-stimulated and lymphocyte-dependent monocyte activation. Although IL 2 had no direct monocyte activating effect, pretreatment of hp monocytes with IL 2 led to a monocyte priming: subsequent coculture with autologous control T lymphocytes enhanced the monocyte Fc gamma R-mediated CL response. The priming of monocytes by IL 2 was dependent on the interaction of IL 2 with the monocytic IL 2 receptor, as shown by inhibition experiments with anti-IL 2 receptor monoclonal antibodies. Thus, we observed an IL 2-driven monocyte/T lymphocyte interaction leading to an increased Fc gamma R-mediated monocytic respiratory burst activity and to the secretion of a soluble MAF activity, but there were no detectable amounts of IFN-gamma.
- Subjects :
- Interleukin 2
Blood Bactericidal Activity
medicine.medical_treatment
T-Lymphocytes
Immunology
Receptors, Fc
Biology
In Vitro Techniques
Peripheral blood mononuclear cell
Monocytes
Interferon-gamma
Phagocytosis
Superoxides
medicine
Immunology and Allergy
Humans
Interferon gamma
IL-2 receptor
Monocyte
Receptors, IgG
Receptors, Interleukin-2
Hematology
T lymphocyte
Antigens, Differentiation
Respiratory burst
medicine.anatomical_structure
Cytokine
Interleukin-2
medicine.drug
Subjects
Details
- ISSN :
- 01712985
- Volume :
- 179
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Immunobiology
- Accession number :
- edsair.doi.dedup.....9b5441a7840bce0c4b25d762a3993339