Interplay between c-Src and the APC/C co-activator Cdh1 regulates mammary tumorigenesis

Nat Commun. 2019 Aug 16;10(1):3716. doi: 10.1038/s41467-019-11618-7.


The Anaphase Promoting Complex (APC) coactivator Cdh1 drives proper cell cycle progression and is implicated in the suppression of tumorigenesis. However, it remains elusive how Cdh1 restrains cancer progression and how tumor cells escape the inhibition of Cdh1. Here we report that Cdh1 suppresses the kinase activity of c-Src in an APC-independent manner. Depleting Cdh1 accelerates breast cancer cell proliferation and cooperates with PTEN loss to promote breast tumor progression in mice. Hyperactive c-Src, on the other hand, reciprocally inhibits the ubiquitin E3 ligase activity of APCCdh1 through direct phosphorylation of Cdh1 at its N-terminus, which disrupts the interaction between Cdh1 and the APC core complex. Furthermore, pharmacological inhibition of c-Src restores APCCdh1 tumor suppressor function to repress a panel of APCCdh1 oncogenic substrates. Our findings reveal a reciprocal feedback circuit of Cdh1 and c-Src in the crosstalk between the cell cycle machinery and the c-Src signaling pathway.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anaphase-Promoting Complex-Cyclosome / metabolism*
  • Animals
  • Breast Neoplasms
  • Carcinogenesis
  • Cdh1 Proteins / genetics
  • Cdh1 Proteins / metabolism*
  • Cell Line, Tumor
  • Cell Proliferation
  • Female
  • Humans
  • MCF-7 Cells
  • Mice
  • Mice, Knockout
  • Neoplasm Transplantation
  • PTEN Phosphohydrolase / genetics
  • Proto-Oncogene Proteins pp60(c-src) / metabolism*
  • Ubiquitin-Protein Ligases / metabolism


  • Cdh1 Proteins
  • Fzr1 protein, mouse
  • Anaphase-Promoting Complex-Cyclosome
  • Ubiquitin-Protein Ligases
  • Proto-Oncogene Proteins pp60(c-src)
  • PTEN Phosphohydrolase
  • Pten protein, mouse