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Related Experiment Videos

Resistance to interferon-alpha in a mouse B-cell lymphoma involves DNA methylation.

T R Reid1, T C Merigan, T Y Basham

  • 1Department of Medicine, Stanford University School of Medicine, CA 94305.

Journal of Interferon Research
|April 1, 1992
PubMed
Summary
This summary is machine-generated.

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DNA mutations and methylation significantly impact interferon-alpha (IFN-alpha) resistance in B-lymphoma cells. Ethylmethylsulfonic acid (EMS) increases resistance, while 5-azacytidine reverts resistant cells to a sensitive state, highlighting DNA

Area of Science:

  • * Molecular Biology
  • * Immunology
  • * Cell Biology

Background:

  • * Interferon-alpha (IFN-alpha) is crucial for antiviral, antiproliferative, and immune regulatory functions.
  • * Resistance to IFN-alpha in B-lymphoma cells leads to the loss of these critical functions.
  • * Understanding the mechanisms of IFN-alpha resistance is vital for therapeutic strategies.

Purpose of the Study:

  • * To investigate the role of DNA mutation and methylation in the development of IFN-alpha resistance.
  • * To quantify the frequency of IFN-alpha resistance induction by specific mutagens and demethylating agents.
  • * To determine the stability and spontaneous rate of IFN-alpha resistance.

Main Methods:

  • * Utilized ethylmethylsulfonic acid (EMS) for chemical mutagenesis to induce DNA point mutations.

Related Experiment Videos

  • * Employed 5-azacytidine to induce DNA hypomethylation and assess its effect on IFN-alpha resistance.
  • * Quantified spontaneous resistance rates and assessed stability through cell passages without selection.

    • Main Results:

    • * EMS treatment increased IFN-alpha resistance frequency 20-40 fold.
    • * 5-azacytidine treatment reduced resistance frequency to 5-10% of control and reverted resistant cells to a sensitive state.
    • * Spontaneous resistance occurred at ~3 x 10(-6) variants/cell/generation and remained stable for over 30 passages.

    Conclusions:

    • * DNA mutation and methylation are critical factors in the development of IFN-alpha resistance in B-lymphoma cells.
    • * Targeting DNA methylation could be a potential strategy to overcome IFN-alpha resistance.
    • * Gene amplification does not appear to be a significant mechanism for IFN-alpha resistance in this cell line.