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Complement biosynthesis in vitro by rat hepatoma cell strains.

R C Strunk, A H Tashjian, H R Colten

    Journal of Immunology (Baltimore, Md. : 1950)
    |January 1, 1975
    PubMed
    Summary
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    Rat hepatoma cells synthesize complement components C-2, C-3, C-5, and C1 INH, but not C-1 or C-4. These findings offer insights into complement biosynthesis regulation.

    Area of Science:

    • Biochemistry
    • Immunology
    • Cell Biology

    Background:

    • The complement system is crucial for innate immunity.
    • Understanding complement component biosynthesis is vital for immunological research.
    • Rat hepatoma cell lines offer a model for studying complement production.

    Purpose of the Study:

    • To investigate the complement synthesis capabilities of rat hepatoma cell strains.
    • To identify which complement components are produced by these cancer cells.
    • To explore factors influencing complement biosynthesis in vitro.

    Main Methods:

    • Culturing four rat hepatoma cell strains and two control cell strains (fibroblast, pituitary).
    • Assessing complement component synthesis using biochemical assays and gel filtration.

    Related Experiment Videos

  • Investigating the effects of cycloheximide and hydrocortisone on complement production.

    • Main Results:

    • Hepatoma cells produced biologically active C-2, C-3, C-5, and C1 INH.
    • No C-1 or C-4 synthesis was detected in any hepatoma strain.
    • Control cells did not produce detectable complement components.
    • Cycloheximide inhibited complement production, and radiolabeled amino acids were incorporated into synthesized components.
    • Hydrocortisone stimulated C-3 production in one cell line (H-4).

    Conclusions:

    • Rat hepatoma cells can synthesize specific complement components, offering a valuable model for research.
    • These cells provide a platform for studying the regulation of complement biosynthesis.
    • The differential production of complement components highlights the heterogeneity of hepatoma cell capabilities.