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Gene transfer in intact animals

M J Cline, H Stang, K Mercola

    Nature
    |April 3, 1980
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    Researchers successfully transferred drug resistance genes into mouse bone marrow cells. These transformed cells showed higher dihydrofolate reductase levels and grew better, proving effective gene transfer for methotrexate resistance.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Genetics

    Background:

    • Methotrexate is a chemotherapy drug that works by inhibiting dihydrofolate reductase.
    • Acquiring resistance to methotrexate is a significant challenge in cancer treatment.
    • Gene transfer offers a potential strategy to overcome drug resistance.

    Purpose of the Study:

    • To investigate the successful induction of methotrexate resistance in mouse bone marrow cells.
    • To demonstrate the feasibility of gene transfer for conferring drug resistance.
    • To analyze the molecular mechanisms underlying acquired methotrexate resistance.

    Main Methods:

    • In vitro transformation of mouse bone marrow cells using DNA from a drug-resistant cell line.
    • In vivo injection of transformed cells into recipient mice.

    Related Experiment Videos

  • Selection of resistant hematopoietic cells through methotrexate treatment of recipients.
  • Quantification of dihydrofolate reductase levels and assessment of cell proliferation.

    • Main Results:

    • Transformed bone marrow cells acquired resistance to methotrexate.
    • Elevated levels of dihydrofolate reductase were observed in resistant cells.
    • Transformed cells exhibited a proliferative advantage over untransformed cells in vivo.
    • Successful gene transfer was confirmed by drug resistance and molecular markers.

    Conclusions:

    • Gene transfer is an effective method for inducing drug resistance in hematopoietic cells.
    • Elevated dihydrofolate reductase is a key mechanism for methotrexate resistance.
    • This approach holds potential for developing novel therapeutic strategies against methotrexate-resistant cancers.