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Isolation and Characterization of Neutrophils with Anti-Tumor Properties
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Isolation and Characterization of Neutrophils with Anti-Tumor Properties

Published on: June 19, 2015

Rabbit tumor necrosis factor: mechanism of action

M R Ruff, G E Gifford

    Infection and Immunity
    |January 1, 1981
    PubMed

    Insights

    Rabbit tumor necrosis factor (TNF) selectively kills transformed cells, not normal cells. Its cytolytic effect on L-929 cells is temperature-dependent and enhanced by actinomycin D or cycloheximide.

    Area of Science:

    • Cell Biology
    • Immunology
    • Biochemistry

    Background:

    • Tumor necrosis factor (TNF) is a cytokine with known cytotoxic effects.
    • Understanding TNF's selective action on different cell types is crucial for therapeutic applications.

    Purpose of the Study:

    • To investigate the effects of rabbit tumor necrosis factor (TNF) on normal and transformed cells in culture.
    • To characterize the mechanism and kinetics of TNF-induced cell killing.

    Main Methods:

    • Development and comparison of various assays for quantifying L-929 cell lysis.
    • Assessment of TNF's effects under different conditions: cell cycle, temperature, and in combination with actinomycin D or cycloheximide.

    Main Results:

    • TNF selectively killed transformed L-929 cells but not normal cells.
    • TNF-induced cytolysis exhibited a lag phase, followed by concentration and time-dependent cell killing.
    • Killing rate and lag period were modulated by actinomycin D, cycloheximide, and temperature (enhanced at 39°C, reduced at 25°C).
    • Dose-response curves suggested less than single-hit kinetics.

    Conclusions:

    • TNF demonstrates selective toxicity towards transformed cells.
    • The mechanism of TNF-mediated cell killing involves a time-dependent process, potentially resembling enzymatic activity.
    • Temperature and drug treatments significantly influence TNF's cytotoxic efficacy.

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