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Related Experiment Videos

Glia maturation factor in bovine brain: partial purification and physicochemical characterization

T Kato, Y Fukui, D E Turriff

    Brain Research
    |May 18, 1981
    PubMed
    Summary

    Researchers partially purified Glia maturation factor (GMF) from bovine brains, identifying its role in stimulating glioblast cell growth and maturation. This protein exhibits both morphological and mitogenic activities, crucial for understanding glial cell development.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Biochemistry

    Background:

    • Glia maturation factor (GMF) is a protein found in the brain.
    • Understanding GMF's function is important for comprehending glial cell development and neurological processes.

    Purpose of the Study:

    • To partially purify Glia maturation factor (GMF) from bovine brains.
    • To characterize the biological activities of the purified GMF.
    • To investigate the potential role of GMF in stimulating glioblast cell growth and maturation.

    Main Methods:

    • Multi-step purification process including extraction, dialysis, freeze-drying, ethanol washing, re-extraction, ion-exchange chromatography (DEAE Sephadex), and molecular sieving (Bio-gel P-200).
    • Assay of morphological transforming and mitogenic activities on glioblasts.

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  • Determination of apparent molecular weight and isoelectric point.
  • Sensitivity testing against protease digestion and heat inactivation.

    • Main Results:

    • Partial purification of GMF yielding a 400-fold increase in morphological activity and a 1400-fold increase in mitogenic activity.
    • The purified GMF has an apparent molecular weight of 23,000 and an isoelectric point of 4.75.
    • GMF demonstrated both morphological transforming and mitogenic activities on glioblasts, detectable in nanogram quantities.
    • Both activities were sensitive to protease digestion and heat inactivation, suggesting a proteinaceous nature.

    Conclusions:

    • The purification procedure successfully isolated GMF with significant enrichment of its biological activities.
    • GMF plays a role in stimulating glioblast proliferation and differentiation.
    • The findings suggest GMF may be involved in the differential or sequential regulation of cell growth and maturation in glial cells.