S-Space College of Medicine/School of Medicine (의과대학/대학원) Surgery (외과학전공) Journal Papers (저널논문_외과학전공)
Bc13-dependent stabilization of CtBP1 is crucial for the inhibition of apoptosis and tumor progression in breast cancer
- Choi, Hee June; Lee, Ji Min; Kim, Hyunkyung; Nam, Hye Jin; Kim, Dongha; Noh, Dong-Young; Kim, Jung Hwa; Baek, Sung Hee; Kim, Keun Il; Ko, Enyoung; Shin, Hi-Jai R.
- Issue Date
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS; Vol.400(3); 396-402
- B-cell lymphoma 3 (Bcl3) is a proto-oncogene upregulated in a wide range of cancers, including breast cancer Although Bcl3 is known to promote cell proliferation and inhibit apoptosis, the molecular mechanisms underlying the proto-oncogenic function of Bcl3 have not been completely elucidated To gain insight into the oncogenic role of Bcl3, we applied a proteomic approach, which led to the identification of C-terminal binding protein 1 (CtBP1) as a binding partner of Bcl3 A PXDLS/R motif embedded in Bcl3 was found to mediate the interaction between Bcl3 and CtBP1, which caused the stabilization of CtBP1 by blocking proteasome-dependent degradation. Apoptotic stimuli-induced degradation of CtBP1 was significantly abolished by the upregulation of Bcl3, leading to the sustained repression of pro-apoptotic gene expression and subsequent inhibition of apoptosis. Intriguingly, a strong positive correlation between the protein levels of Bcl3 and CtBP1 was detected in breast cancer patient samples Our study reveals a novel combinatorial role for Bcl3 and CtBP1, providing an explanation for the acquisition of resistance to apoptosis in cancer cells, which is a major requirement for cancer development.
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