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Effect of recombinant interferon-gamma on protein content, phagocytic, and cytotoxic activity of mouse peritoneal
1Kaptein W. Wilhelmsen and Frues Institute of Bacteriology, National Hospital of Norway, University of Oslo.
Abstract:
We have studied the effect of recombinant murine interferon-gamma (rMuIFN-gamma) on the protein content, phagocytic activity, and cytotoxicity of mouse peritoneal macrophages (MPM). The aim of this study was to see whether rMuIFN-gamma alone could influence these parameters of MPM activity or if an additional stimulus, like elicitation or cultivation with lipopolysaccharide (LPS), was required. The MPM cultures were treated with rMuIFN-gamma for 24, 48, or 72 h. Generally, rMuIFN-gamma treatment of the cultures increased the protein content of the MPM. MPM were generally cytotoxic and they phagocytized IgG-opsonized Escherichia coli under the experimental conditions of this study. The effects of rMuIFN-gamma on phagocytic and cytotoxic activities were complex and highly dependent on the dose and length of treatment. Low or high concentrations may exert opposite effects on the same functions. Addition of a low dose of LPS to the cultures did not generally amplify the rMuIFN-gamma-induced alterations of MPM activities. However, the combination of LPS, high doses of rMuIFN-gamma, and long incubation time reduced the protein content, suppressed the phagocytic activity, and negatively influenced the viability of the MPM. Thioglycolate-elicited MPM had a higher baseline activity than resident MPM, but the rMuIFN-gamma effect on elicited MPM was parallel to the effect on resident MPM.
Insights
Recombinant murine interferon-gamma (rMuIFN-gamma) impacts mouse peritoneal macrophage (MPM) protein content, phagocytosis, and cytotoxicity. Its effects vary with dose and duration, sometimes requiring additional stimuli like lipopolysaccharide (LPS) for significant changes.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Mouse peritoneal macrophages (MPM) play a crucial role in innate immunity.
- Interferon-gamma (IFN-γ) is a key cytokine involved in immune regulation.
- Understanding the modulation of macrophage functions by IFN-γ is vital for immune research.
Purpose of the Study:
- To investigate the effects of recombinant murine interferon-gamma (rMuIFN-gamma) on MPM.
- To determine if rMuIFN-gamma alone influences MPM protein content, phagocytosis, and cytotoxicity.
- To assess the necessity of additional stimuli, such as lipopolysaccharide (LPS) or elicitation, for rMuIFN-gamma to modulate MPM activity.
Main Methods:
- MPM cultures were treated with varying doses of rMuIFN-gamma for 24, 48, or 72 hours.
- Protein content, phagocytic activity (IgG-opsonized Escherichia coli), and cytotoxicity were measured.
- Experiments included MPM treated with rMuIFN-gamma alone, with LPS, or elicited with thioglycolate.
Main Results:
- rMuIFN-gamma generally increased MPM protein content.
- Phagocytic and cytotoxic activities were complexly affected by rMuIFN-gamma dose and treatment duration, with concentration-dependent opposing effects observed.
- Combined high-dose rMuIFN-gamma, LPS, and long incubation reduced protein content, suppressed phagocytosis, and impaired MPM viability.
- Thioglycolate-elicited MPM showed parallel responses to rMuIFN-gamma as resident MPM, despite higher baseline activity.
Conclusions:
- rMuIFN-gamma alone can modulate MPM protein content.
- The impact of rMuIFN-gamma on MPM phagocytic and cytotoxic functions is dose- and time-dependent, exhibiting complex regulatory patterns.
- While LPS can amplify some effects, high doses of rMuIFN-gamma with LPS and prolonged incubation can be detrimental to MPM function and viability.