1. miR‐221 confers lapatinib resistance by negatively regulating p27kip1 in HER2‐positive breast cancer
- Author
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Chih Yen Tu, Wei Chien Huang, Ya-Ling Wei, Liang Chih Liu, Jin-Han Yao, Jhen-Yu Chen, Thanh Kieu Huynh, Chia-Hung Chen, Hsiao-Fan Chen, Yi-Shiang Yang, Yuan-Man Hsu, and Chih-Hao Huang
- Subjects
Cancer Research ,Receptor, ErbB-2 ,Dasatinib ,SRC Family Tyrosine Kinase ,Tyrosine-kinase inhibitor ,Mice ,Phosphatidylinositol 3-Kinases ,Cell, Molecular, and Stem Cell Biology ,Medicine ,Epidermal growth factor receptor ,skin and connective tissue diseases ,Mice, Inbred BALB C ,biology ,Forkhead Box Protein O3 ,General Medicine ,Up-Regulation ,src-Family Kinases ,Oncology ,miR‐221 ,Original Article ,Female ,Cyclin-Dependent Kinase Inhibitor p27 ,medicine.drug ,Proto-oncogene tyrosine-protein kinase Src ,medicine.drug_class ,Down-Regulation ,Mice, Nude ,Antineoplastic Agents ,Breast Neoplasms ,Lapatinib ,Cell Line, Tumor ,Animals ,Humans ,Protein kinase B ,Protein Kinase Inhibitors ,PI3K/AKT/mTOR pathway ,Src inhibition ,business.industry ,NF‐κB ,lapatinib resistance ,NF-kappa B p50 Subunit ,Original Articles ,Microarray Analysis ,MicroRNAs ,Drug Resistance, Neoplasm ,Cancer research ,biology.protein ,business ,p27kip1 ,Proto-Oncogene Proteins c-akt ,Hepatocyte Nuclear Factor 3-gamma - Abstract
Development of acquired resistance to lapatinib, a dual epidermal growth factor receptor (EGFR)/human epidermal growth factor receptor 2 (HER2) tyrosine kinase inhibitor, severely limits the duration of clinical response in advanced HER2‐driven breast cancer patients. Although the compensatory activation of the PI3K/Akt survival signal has been proposed to cause acquired lapatinib resistance, comprehensive molecular mechanisms remain required to develop more efficient strategies to circumvent this therapeutic difficulty. In this study, we found that suppression of HER2 by lapatinib still led to Akt inactivation and elevation of FOX3a protein levels, but failed to induce the expression of their downstream pro‐apoptotic effector p27kip1, a cyclin‐dependent kinase inhibitor. Elevation of miR‐221 was found to contribute to the development of acquired lapatinib resistance by targeting p27kip1 expression. Furthermore, upregulation of miR‐221 was mediated by the lapatinib‐induced Src family tyrosine kinase and subsequent NF‐κB activation. The reversal of miR‐221 upregulation and p27kip1 downregulation by a Src inhibitor, dasatinib, can overcome lapatinib resistance. Our study not only identified miRNA‐221 as a pivotal factor conferring the acquired resistance of HER2‐positive breast cancer cells to lapatinib through negatively regulating p27kip1 expression, but also suggested Src inhibition as a potential strategy to overcome lapatinib resistance., The downregulation of p27kip1 by Src/NF‐κB axis‐induced miR‐221 expression as a novel mechanistic insight into lapatinib resistance. Targeting Src would be a promising strategy to overcome lapatinib resistance.
- Published
- 2021