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Hexose uptake enhancing factor released from Rous sarcoma cells.

D A Lawrence, P Jullien

    Journal of Cellular Physiology
    |February 1, 1980
    PubMed
    Summary
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    Conditioned media from transformed chicken cells contain a factor that enhances glucose uptake in normal cells. This factor, approximately 20,000 daltons, is heat-sensitive and may relate to glucose transport proteins.

    Area of Science:

    • Cell Biology
    • Biochemistry
    • Virology

    Background:

    • Rous sarcoma virus (RSV) transformation alters cellular functions.
    • Transformed cells release factors influencing normal cells.
    • Glucose uptake is a key metabolic indicator of cell state.

    Purpose of the Study:

    • To identify and characterize the factor in RSV-transformed chicken embryo fibroblast conditioned media that stimulates 2-deoxyglucose uptake in normal fibroblasts.
    • To determine the properties of this stimulatory factor.

    Main Methods:

    • Preparation of conditioned media from RSV-transformed and normal chicken embryo fibroblasts.
    • Assay of 2-deoxyglucose uptake in normal fibroblasts treated with conditioned media.
    • Enzymatic treatment (trypsin) and gel filtration to characterize the factor.

    Related Experiment Videos

  • Assessment of protease and plasminogen activator activities.
  • Main Results:

    • Conditioned media from RSV-transformed cells significantly increased 2-deoxyglucose uptake in normal fibroblasts.
    • The active factor is destroyed by trypsin, indicating it is proteinaceous.
    • The factor's activity is independent of protease and plasminogen activator activities.
    • Gel filtration estimated the factor's molecular weight at approximately 20,000 daltons.
    • A similar factor, albeit in lower amounts, is shed by non-transformed fibroblasts.

    Conclusions:

    • A heat-sensitive protein factor, around 20,000 daltons, present in conditioned media from RSV-transformed chicken cells stimulates glucose uptake in normal cells.
    • This factor may be related to glucose binding and transport proteins.
    • The findings suggest a potential role for secreted factors in mediating metabolic changes during viral transformation.