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Macrophage cell lines produce a cytotoxin
Journal of Immunology (Baltimore, Md. : 1950)
|May 1, 1979
Summary
Macrophage cell lines release cytotoxic compounds that harm target cells. This activity, found in four of five lines, peaked after cell confluence and was stable through purification.
Area of Science:
- Immunology
- Cell Biology
Background:
- Macrophages are key immune cells involved in host defense.
- Understanding macrophage-derived factors is crucial for immunology research.
Purpose of the Study:
- To investigate the presence and characteristics of cytotoxic factors produced by macrophage cell lines.
Main Methods:
- Assessing cytotoxic activity via tritium release from labeled 7943 cells.
- Evaluating activity over time and after cell confluence.
- Employing dialysis, lyophilization, and Sephadex G-200 chromatography for purification and molecular weight determination.
Main Results:
- Four of five macrophage cell lines exhibited cytotoxic activity in culture fluids.
- Peak activity in the P388D1 cell line occurred 7 days post-culture, 2 days after confluence.
- The cytotoxic factor remained active after dialysis and lyophilization.
- Chromatography revealed two activity peaks, one in the void volume and another at 40,000-50,000 m.w.
Conclusions:
- Macrophage cell lines secrete cytotoxic substances.
- The characterized cytotoxic factor is relatively stable and has a defined molecular weight range.