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

Tao Han, Shulong Jiang, Hong Zheng, Qing Yin, Mengyu Xie, Margaret R Little, Xiu Yin, Ming Chen, Su Jung Song, Amer A. Beg, Pier Paolo Pandolfi and Lixin Wan ()
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Tao Han: H. Lee Moffitt Cancer Center and Research Institute
Shulong Jiang: H. Lee Moffitt Cancer Center and Research Institute
Hong Zheng: H. Lee Moffitt Cancer Center and Research Institute
Qing Yin: H. Lee Moffitt Cancer Center and Research Institute
Mengyu Xie: H. Lee Moffitt Cancer Center and Research Institute
Margaret R Little: H. Lee Moffitt Cancer Center and Research Institute
Xiu Yin: H. Lee Moffitt Cancer Center and Research Institute
Ming Chen: Beth Israel Deaconess Medical Center, Harvard Medical School
Su Jung Song: Beth Israel Deaconess Medical Center, Harvard Medical School
Amer A. Beg: H. Lee Moffitt Cancer Center and Research Institute
Pier Paolo Pandolfi: Beth Israel Deaconess Medical Center, Harvard Medical School
Lixin Wan: H. Lee Moffitt Cancer Center and Research Institute

Nature Communications, 2019, vol. 10, issue 1, 1-15

Abstract: Abstract 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.

Date: 2019
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DOI: 10.1038/s41467-019-11618-7

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