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Related Experiment Videos

Properties and structure-function relationship of HGF-SF

E Gherardi1, M Sharpe, K Lane

  • 1Department of Medicine, Addenbrooke's Hospital, Cambridge, UK.

EXS
|January 1, 1993
PubMed
Summary

Hepatocyte growth factor-secreted factor (HGF-SF) is crucial for liver cell growth and epithelial cell movement. Protein engineering confirms both growth factor and scatter factor activities require specific domains, diverging post-receptor signaling.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Hepatocyte growth factor-secreted factor (HGF-SF) exhibits dual roles: promoting liver cell proliferation (HGF) and enhancing epithelial cell motility (scatter factor, SF).
  • HGF-SF is a heterodimeric protein derived from a single precursor, sharing structural homology with plasminogen and HGF-like protein due to conserved cysteine residues.
  • The A subunit comprises an N-terminal domain and four kringle domains, while the B subunit possesses a serine protease-like domain, albeit lacking protease activity.

Purpose of the Study:

  • To elucidate the functional domains of HGF-SF essential for its biological activities.
  • To investigate the relationship between mitogenic and motogenic functions of HGF-SF.
  • To confirm the hypothesis that HGF-SF's mitogenic and motogenic responses diverge at the post-receptor level.

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Main Methods:

  • Site-directed mutagenesis to generate deletion and point mutants of HGF-SF.
  • Expression and analysis of a truncated HGF-SF form produced by alternative splicing.
  • Assays to evaluate mitogenic and motogenic activities of HGF-SF variants.

Main Results:

  • Both N-terminal and kringle domains of the A chain, along with the B chain, are indispensable for HGF-SF's biological activity.
  • Mutations affecting mitogenic activity invariably resulted in the loss of motogenic activity, and vice versa.
  • Protein engineering experiments provided strong evidence for distinct post-receptor signaling pathways for HGF-SF's growth-promoting and cell-motility-inducing functions.

Conclusions:

  • The study confirms that specific domains within HGF-SF are critical for both its mitogenic and motogenic functions.
  • The findings support the hypothesis that the distinct biological responses to HGF-SF are initiated downstream of receptor binding.
  • Understanding these domain requirements and signaling pathways is key for HGF-SF-related research and therapeutic development.