Agonist monoclonal antibodies against HGF receptor protect cardiac muscle cells from apoptosis.

  • Pietronave S
  • Forte G
  • Locarno D
 et al. 
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Abstract

Hepatocyte growth factor (HGF), a pleiotropic cytokine with mitogenic, motogenic, morphogenic, and antiapoptotic effects in various cell types, is a cardioprotective growth factor that can counteract the loss of cardiomyocytes usually observed in cardiac diseases. HGF is a quite unstable molecule in its biologically active heterodimeric form. Since all HGF-induced biological responses are mediated by its high-affinity tyrosine kinase receptor (Met/HGF-R) encoded by the Met gene, we asked whether a monoclonal antibody (MAb) that displays receptor full agonist activity could protect cardiac muscle cell lines from hydrogen peroxide-induced apoptosis. We report that the MAb efficiently inhibited hydrogen peroxide-induced cell shrinkage, DNA fragmentation, annexin V positivity, mitochondrial translocation of bax, and caspase activation. The MAb was thus able to counteract apoptosis evaluated by both morphological and biochemical criteria. The agonist activity of the MAb was mediated by Met/HGF-R, since a Met/HGF-R-specific short hairpin RNA (shRNA) inhibited both activation of transduction pathways and motility triggered by MAb DO-24. The protective antiapoptotic effect of MAb DO-24 was dependent on activation of the ras-MAPK Erk1/2 and phosphatidylinositol 3-kinase (PI3-kinase)-Akt transduction pathways, since it was abrogated by treatments with their specific pharmacological inhibitors, PD-98059 and wortmannin. Moreover, the MAb induced a motogenic, but not mitogenic, response in these cells, mimicking in all aspects the natural ligand HGF but displaying a significant higher stability than HGF in culture. This MAb may thus be a valuable substitute for HGF, being more easily available in a biologically active, highly stable, and purified form.

Author-supplied keywords

  • Animals
  • Antibodies, Monoclonal
  • Antibodies, Monoclonal: immunology
  • Antibodies, Monoclonal: pharmacology
  • Apoptosis
  • Apoptosis: drug effects
  • Cell Line
  • Cell Movement
  • Cell Movement: drug effects
  • Cell Proliferation
  • Cell Proliferation: drug effects
  • Dogs
  • Extracellular Signal-Regulated MAP Kinases
  • Extracellular Signal-Regulated MAP Kinases: metabo
  • Hydrogen Peroxide
  • Hydrogen Peroxide: pharmacology
  • Mice
  • Models, Animal
  • Myocytes, Cardiac
  • Myocytes, Cardiac: cytology
  • Myocytes, Cardiac: drug effects
  • Myocytes, Cardiac: metabolism
  • NIH 3T3 Cells
  • Phosphatidylinositol 3-Kinases
  • Phosphatidylinositol 3-Kinases: metabolism
  • Proto-Oncogene Proteins c-akt
  • Proto-Oncogene Proteins c-akt: drug effects
  • Proto-Oncogene Proteins c-akt: metabolism
  • Proto-Oncogene Proteins c-met
  • Proto-Oncogene Proteins c-met: drug effects
  • Proto-Oncogene Proteins c-met: immunology
  • Proto-Oncogene Proteins c-met: metabolism
  • Proto-Oncogene Proteins p21(ras)
  • Proto-Oncogene Proteins p21(ras): metabolism
  • Rats
  • Signal Transduction
  • Signal Transduction: drug effects

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Authors

  • Stefano Pietronave

  • Giancarlo Forte

  • Deborah Locarno

  • Simone Merlin

  • Andrea Zamperone

  • Giuseppina Nicotra

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