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Characterization of macrophage cytotoxicity factor (MCF)
International Archives of Allergy and Applied Immunology
|January 1, 1977
Summary
Immune T cells release a macrophage cytotoxicity factor (MCF) that kills target cells. This study chemically characterizes nonspecific MCF, determining its molecular weight and stability.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- T lymphocytes play a crucial role in adaptive immunity.
- Macrophages are key effector cells in the immune response.
- Antigen-specific T cell activation can lead to the release of soluble mediators.
Purpose of the Study:
- To characterize the chemical properties of macrophage cytotoxicity factor (MCF).
- To determine the molecular weight and stability of nonspecific MCF activity.
- To understand the nature of the factor mediating T cell-induced macrophage cytotoxicity.
Main Methods:
- Purification of MCF using DEAE-cellulose chromatography.
- Size exclusion chromatography on Sephadex G-100 to estimate molecular weight.
- Assay of cytotoxic activity by measuring 51Cr release from target cells.
Main Results:
- Nonspecific MCF activity was purified.
- The active material eluted as a single peak from Sephadex G-100.
- The molecular weight of nonspecific MCF was determined to be 28,000+/-5,000 Da.
- The purified MCF demonstrated stability at -70°C for several months.
Conclusions:
- Nonspecific macrophage cytotoxicity factor (MCF) has been chemically characterized.
- MCF is a stable molecule with a defined molecular weight.
- These findings contribute to understanding T cell-mediated immune responses and macrophage activation.