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- W4297338596 abstract "HOXA5 is a transcription factor and tumor suppressor that promotes differentiation of breast epithelial cells and is frequently lost during malignant transformation. HOXA5 loss alone, however, does not confer tumorigenicity. To determine which molecular alterations combined with loss of HOXA5 expression can transform cells, we examined isogenic derivatives of a nonmalignant breast epithelial cell line containing knock-in or knockout mutations in key breast cancer genes. Knockdown (KD) of HOXA5 in cells harboring double knock-in (DKI) of mutated PIK3CA (E545K) and HER2 (V777L) induced epithelial-mesenchymal transition and migration and promoted invasive tumor outgrowth within mouse mammary ducts. The NF-κB pathway was significantly upregulated in DKI cells following HOXA5 KD. HOXA5 KD upregulated multiple NF-κB target genes, including IL6. IκBα protein, but not RNA, expression was reduced in HOXA5-KD cells. HOXA5 bound and stabilized IκBα, forming a nuclear HOXA5-IκBα complex. Chromatin immunoprecipitation sequencing database queries revealed that HOXA5 and IκBα are co-enriched at 528 genomic loci. In patients with breast cancer, high coexpression of HOXA5 and IκBα conferred a significantly better overall and progression-free survival. Collectively, these data suggest that HOXA5 suppresses malignancy in breast epithelial cells by blunting NF-κB action via stabilization of its inhibitor IκBα.Loss of HOXA5 reduces IκBα stability and increases NF-κB signaling to exacerbate breast cancer aggressiveness, providing new insights into the tumor suppressor functions of HOXA5." @default.
- W4297338596 created "2022-09-28" @default.
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- W4297338596 date "2022-08-25" @default.
- W4297338596 modified "2023-10-16" @default.
- W4297338596 title "HOXA5-Mediated Stabilization of IκBα Inhibits the NF-κB Pathway and Suppresses Malignant Transformation of Breast Epithelial Cells" @default.
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- W4297338596 doi "https://doi.org/10.1158/0008-5472.can-21-4277" @default.
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