Dataset Information

HOMER3 facilitates growth factor-mediated ?-Catenin tyrosine phosphorylation and activation to promote metastasis in triple negative breast cancer.

ABSTRACT:

Background

HOMER family scaffolding proteins (HOMER1-3) play critical roles in the development and progression of human disease by regulating the assembly of signal transduction complexes in response to extrinsic stimuli. However, the role of HOMER protein in breast cancer remains unclear.

Methods

HOMER3 expression was examined by immunohistochemistry in breast cancer patient specimens, and its significance in prognosis was assessed by Kaplan-Meier survival analysis. The effects of HOMER3 in growth factor-induced ?-Catenin activation were analyzed by assays such as TOP/FOP flash reporter, tyrosine phosphorylation assay and reciprocal immunoprecipitation (IP) assay. Role of HOMER3 in breast cancer metastasis was determined by cell function assays and mice tumor models.

Results

Herein, we find that, among the three HOMER proteins, HOMER3 is selectively overexpressed in the most aggressive triple negative breast cancer (TNBC) subtype, and significantly correlates with earlier tumor metastasis and shorter patient survival. Mechanismly, HOMER3 interacts with both c-Src and ?-Catenin, thus providing a scaffolding platform to facilitate c-Src-induced ?-Catenin tyrosine phosphorylation under growth factor stimulation. HOMER3 promotes ?-Catenin nuclear translocation and activation, and this axis is clinically relevant. HOMER3 promotes and is essential for EGF-induced aggressiveness and metastasis of TNBC cells both in vitro and in vivo.

Conclusion

These findings identify a novel role of HOMER3 in the transduction of growth factor-mediated ?-Catenin activation and suggest that HOMER3 might be a targetable vulnerability of TNBC.

SUBMITTER: Liu Q

PROVIDER: S-EPMC7788750 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Publications

HOMER3 facilitates growth factor-mediated β-Catenin tyrosine phosphorylation and activation to promote metastasis in triple negative breast cancer.

Liu Qinghua Q He Lixin L Li Siqi S Li Fengyan F Deng Guangzheng G Huang Xinjian X Yang Muwen M Xiao Yunyun Y Chen Xiangfu X Ouyang Ying Y Chen Jinxin J Wu Xuxia X Wang Xi X Song Libing L Lin Chuyong C

Journal of hematology & oncology 20210106 1

<h4>Background</h4>HOMER family scaffolding proteins (HOMER1-3) play critical roles in the development and progression of human disease by regulating the assembly of signal transduction complexes in response to extrinsic stimuli. However, the role of HOMER protein in breast cancer remains unclear.<h4>Methods</h4>HOMER3 expression was examined by immunohistochemistry in breast cancer patient specimens, and its significance in prognosis was assessed by Kaplan-Meier survival analysis. The effects o ...[more]

PMID: 33407765

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