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Related Experiment Videos

Expression of active human factor IX in transfected cells.

S Busby, A Kumar, M Joseph

    Nature
    |July 18, 1985
    PubMed
    Summary

    Researchers used recombinant DNA technology to produce biologically active human factor IX in cultured mammalian cells. This breakthrough offers a safer alternative to plasma-derived treatments for hemophilia B, reducing contaminant risks.

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    Area of Science:

    • Biotechnology
    • Molecular Biology
    • Hematology

    Background:

    • Hemophilia B (Christmas disease) is a genetic bleeding disorder caused by deficiencies in coagulation Factor IX.
    • Current treatments involve plasma-derived products with risks of viral contamination (hepatitis, AIDS).
    • A need exists for a pure, safe, and effective source of human Factor IX.

    Purpose of the Study:

    • To develop a recombinant DNA method for producing biologically active human Factor IX.
    • To establish stable mammalian cell lines capable of secreting recombinant Factor IX.
    • To demonstrate the therapeutic potential of the produced Factor IX in vitro.

    Main Methods:

    • Utilized recombinant DNA techniques to insert the human Factor IX gene into cultured cells.

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  • Employed cotransfection of baby hamster kidney (BHK) cells with Factor IX and selectable marker plasmids.
  • Generated stable cell lines for continuous production and secretion of the protein.

    • Main Results:

    • Successfully produced biologically active human Factor IX in cultured mammalian cells.
    • Secreted protein demonstrated the ability to reduce clotting time in Factor IX-deficient plasma.
    • Confirmed the authenticity of the recombinant protein as human Factor IX.

    Conclusions:

    • Recombinant DNA technology provides a viable method for producing pure, active human Factor IX.
    • This approach offers a potentially safer alternative to plasma-derived Factor IX for hemophilia B patients.
    • Further development could lead to improved therapies for bleeding disorders.