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Modulation by interferons of the expression of monocyte complement genes
D F Lappin1, G D Birnie, K Whaley
1University of Glasgow Department of Pathology, Western Infirmary, Glasgow, U.K.
The Biochemical Journal
|June 1, 1990
Summary
Interferons-alpha, -beta, and -gamma (IFNs) boost the production of complement components C2, Factor B, and C1 inhibitor in human monocytes. These IFNs rapidly increase mRNA levels, with synergistic effects observed for C1 inhibitor and Factor B synthesis.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Interferons (IFNs) are crucial cytokines involved in immune responses.
- Monocytes play a key role in innate and adaptive immunity.
- Complement system proteins like C2, Factor B, and C1 inhibitor are vital for immune regulation.
Purpose of the Study:
- To investigate the effects of Interferons-alpha, -beta, and -gamma (IFNs) on the synthesis of complement components C2, Factor B, and C1 inhibitor by human monocytes.
- To elucidate the dose-dependency, kinetics, and mRNA regulation of these responses.
- To examine potential synergistic or additive interactions between different IFNs.
Main Methods:
- Human monocytes were cultured in vitro and treated with varying concentrations of IFNs-alpha, -beta, and -gamma.
- Synthesis rates of C2, Factor B, and C1 inhibitor were measured.
- mRNA abundances for C2, Factor B, C1 inhibitor, and actin were quantified using molecular techniques.
- Kinetic studies and experiments involving cytokine removal and simultaneous application were performed.
Main Results:
- All three IFNs (IFN-alpha, -beta, -gamma) stimulated the synthesis of C2, Factor B, and C1 inhibitor in a dose-dependent manner, correlating with increased mRNA levels.
- IFN-gamma was most potent for C1 inhibitor, while IFN-alpha and -beta were slightly more effective for C2 and Factor B.
- IFN-alpha and -beta showed synergistic effects with IFN-gamma on C1 inhibitor and Factor B synthesis when applied simultaneously.
- IFN-gamma inhibited C3 synthesis, whereas IFN-alpha and -beta had no effect on C3 or actin mRNA expression.
Conclusions:
- IFNs-alpha, -beta, and -gamma differentially regulate the synthesis of key complement proteins and C1 inhibitor in human monocytes.
- The observed rapid and dose-dependent effects are mediated at the mRNA level.
- Synergistic interactions between IFNs highlight complex regulatory mechanisms in monocyte immune responses.