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

• Published in: Nature communications 2019-08, Vol.10 (1), p.3716-15, Article 3716
• Main Authors: Han, Tao, Jiang, Shulong, Zheng, Hong, Yin, Qing, Xie, Mengyu, Little, Margaret R, Yin, Xiu, Chen, Ming, Song, Su Jung, Beg, Amer A., Pandolfi, Pier Paolo, Wan, Lixin
• Format: Article
• Language: English
• Subjects: 13/109; 13/31; 13/95; 14; 14/19; 38; 38/89; 42; 45; 59; 631/67; 631/67/1244; 631/67/1347; 631/67/68; 631/80; 64/60; 82/1; 82/80; Adenomatous polyposis coli; Anaphase; Anaphase-promoting complex; Anaphase-Promoting Complex-Cyclosome - metabolism; Animals; Breast cancer; Breast Neoplasms; Carcinogenesis; Cdh1 Proteins - genetics; Cdh1 Proteins - metabolism; Cell cycle; Cell Line, Tumor; Cell Proliferation; Crosstalk; E-cadherin; Feedback circuits; Female; Humanities and Social Sciences; Humans; Inhibition; Kinases; MCF-7 Cells; Mice; Mice, Knockout; multidisciplinary; N-Terminus; Neoplasm Transplantation; Phosphorylation; Proto-Oncogene Proteins pp60(c-src) - metabolism; PTEN Phosphohydrolase - genetics; PTEN protein; Science; Science (multidisciplinary); Signal transduction; Src protein; Substrates; Tumor cells; Tumor suppressor genes; Tumorigenesis; Tumors; Ubiquitin; Ubiquitin-protein ligase; Ubiquitin-Protein Ligases - metabolism
• ISSN: 2041-1723; 2041-1723
• 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 APC Cdh1 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 APC Cdh1 tumor suppressor function to repress a panel of APC Cdh1 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. The Anaphase Promoting Complex adaptor protein Cdh1 tightly controls cell cycle progression to restrain tumorigenesis but the mechanism is not completely known. Here, the authors show that reciprocal inhibition between Cdh1 and the c-Src signaling pathway regulate breast cancer tumorigenesis.