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IL-2 enhances c-fms expression in human monocytes.
I Espinoza-Delgado1, D L Longo, G L Gusella
1Division of Cancer Treatment, National Cancer Institute (NCI), Frederick, MD 21701-1013.
Journal of Immunology (Baltimore, Md. : 1950)
|August 15, 1990
Summary
Interleukin-2 (IL-2) boosts macrophage CSF receptor (c-fms) expression in monocytes, enhancing their tumor-killing activity. This effect, mediated by IL-2, prolongs monocyte tumoricidal function when combined with macrophage CSF-1.
Area of Science:
- Immunology
- Molecular Biology
- Oncology
Background:
- Monocytes express low levels of c-fms mRNA, encoding the macrophage colony-stimulating factor (CSF) receptor.
- Proto-oncogene c-fms is crucial for monocyte differentiation and function.
Purpose of the Study:
- To investigate the impact of Interleukin-2 (IL-2) and Interferon-gamma (IFN-gamma) on c-fms mRNA and protein expression in human monocytes.
- To determine the role of IL-2 and IFN-gamma in modulating monocyte-mediated tumoricidal activity.
Main Methods:
- Quantitative analysis of c-fms mRNA expression in monocytes stimulated with IL-2 or IFN-gamma.
- Immunoprecipitation assays to assess c-fms glycoprotein levels.
- Functional assays measuring monocyte tumoricidal activity following cytokine stimulation and macrophage CSF-1 treatment.
Main Results:
- IL-2 significantly increased c-fms mRNA levels in monocytes within 6 hours; 100 U/ml IL-2 was sufficient.
- IFN-gamma did not affect c-fms mRNA or glycoprotein levels.
- IL-2 enhanced c-fms glycoprotein expression.
- Macrophage CSF-1 sustained IL-2-induced, but not IFN-gamma-induced, monocyte tumoricidal activity.
Conclusions:
- IL-2 upregulates both c-fms mRNA and glycoprotein expression in human monocytes.
- By enhancing macrophage CSF-1 receptor expression, IL-2 can prolong monocyte-mediated tumoricidal activity in the presence of exogenous macrophage CSF-1.