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Related Experiment Videos

A mouse leukemia cell mutant resistant to blasticidin S

M Kuwano, K Matsui, K Takenaka

    International Journal of Cancer
    |August 15, 1977
    PubMed
    Summary

    A blasticidin S-resistant mutant cell line (Bla-R) was developed from mouse leukemia cells. This mutant shows resistance to blasticidin S, indicating a specific alteration in protein synthesis inhibition.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Biochemistry

    Background:

    • Blasticidin S is a potent inhibitor of protein synthesis.
    • Mouse leukemia L5178Y cells are sensitive to blasticidin S.
    • Understanding drug resistance mechanisms is crucial for cancer therapy.

    Purpose of the Study:

    • To isolate and characterize a blasticidin S-resistant mutant of mouse leukemia L5178Y cells.
    • To investigate the mechanism of blasticidin S resistance at the molecular level.

    Main Methods:

    • Nitrosoguanidine mutagenesis was employed to generate drug-resistant mutants.
    • Cell growth and protein synthesis (leucine incorporation) were measured in the presence of blasticidin S.
    • In vitro protein synthesis assays were performed using S-30 extracts and S100 fractions with different ribosomal sources.

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    Main Results:

    • A blasticidin S-resistant mutant cell line (Bla-R) was successfully isolated.
    • Bla-R cells exhibited resistance to blasticidin S, with no inhibition of growth or protein synthesis.
    • Other protein synthesis inhibitors (fusidic acid, cycloheximide, ricin D, L-asparaginase) retained their inhibitory effects on Bla-R cells.
    • In vitro studies revealed that blasticidin S did not inhibit protein synthesis using S-30 extracts or ribosomes from Bla-R cells, unlike the parental L5178Y cells.

    Conclusions:

    • The blasticidin S resistance in Bla-R cells is specific and likely involves a defect in the ribosomal machinery.
    • This study identifies a novel mechanism of resistance to blasticidin S, potentially related to ribosomal alterations.