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Interferon, double-stranded RNA, and protein phosphorylation.

B Lebleu, G C Sen, S Shaila

    Proceedings of the National Academy of Sciences of the United States of America
    |September 1, 1976
    PubMed
    Summary
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    Interferon treatment enhances double-stranded RNA-induced protein phosphorylation in Ehrlich ascites tumor cells. This phosphorylation, particularly of P1 and P2 proteins, is crucial for interferon

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cell Biology

    Background:

    • Interferon treatment enhances endonuclease activity in Ehrlich ascites tumor cells.
    • Double-stranded RNA (dsRNA) is a key component in antiviral responses.

    Purpose of the Study:

    • To investigate the effect of dsRNA on protein phosphorylation in interferon-treated and untreated Ehrlich ascites tumor cells.
    • To identify specific proteins whose phosphorylation is modulated by dsRNA in the presence or absence of interferon.

    Main Methods:

    • Cell extracts from interferon-treated and control Ehrlich ascites tumor cells were prepared.
    • Phosphorylation assays were performed using [gamma-32P]ATP and dsRNA.
    • Protein phosphorylation was analyzed, and specific proteins (P1 and P2) were identified by molecular weight.

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    Main Results:

    • Double-stranded RNA promoted the phosphorylation of two proteins, P1 (64 kDa) and P2 (37 kDa), in interferon-treated cell extracts.
    • Phosphorylation of P1 was also observed in untreated cell extracts but to a lesser extent.
    • Degraded dsRNA or DNA did not induce significant phosphorylation, indicating specificity.

    Conclusions:

    • Interferon treatment significantly enhances dsRNA-induced phosphorylation of specific proteins in tumor cells.
    • This enhanced phosphorylation may be linked to the increased endonuclease activity previously observed.
    • The findings highlight a specific molecular mechanism modulated by interferon and dsRNA in cancer cells.