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Related Experiment Videos

MK: a pluripotential embryonic stem-cell-derived neuroregulatory factor.

V Nurcombe1, N Fraser, E Herlaar

  • 1Department of Biochemistry, University of Oxford, UK.

Development (Cambridge, England)
|December 1, 1992
PubMed
Summary

MK, a heparin-binding growth factor, acts as a potent neuroregulatory molecule. Its activity is enhanced by extracellular matrix binding, influencing neural precursor cell development.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Neuroscience

Background:

  • MK is a gene encoding a secreted heparin-binding polypeptide.
  • MK is highly expressed in embryonal carcinoma and embryonic stem cells and their differentiated derivatives.
  • MK expression is independent of retinoic acid (RA).

Purpose of the Study:

  • To investigate the biological activity of recombinant MK protein (rMK).
  • To determine MK's role in cell proliferation and differentiation.
  • To explore MK's function as a neuroregulatory molecule.

Main Methods:

  • Produced and purified recombinant MK protein (rMK) using heparin affinity chromatography.
  • Assessed rMK's mitogenic activity on various cell types, including fibroblasts and neural precursors.

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  • Evaluated rMK's neurotrophic effects on chick sympathetic neurons.
  • Generated stable cell lines expressing MK and analyzed extracellular matrix preparations.

    • Main Results:

    • rMK is a weak mitogen for fibroblasts but a potent mitogen for RA-induced neurectodermal precursor cells.
    • rMK exhibits in vitro neurotrophic activity for chick sympathetic neurons, potentiated by heparin and plastic binding.
    • MK-expressing cells did not show transformation, but their extracellular matrix contained potent MK biological activity.

    Conclusions:

    • MK is a multifunctional neuroregulatory molecule.
    • MK's biological activity is dependent on its association with extracellular matrix components.