Histone Deacetylase Inhibitor Enhances the Efficacy of MEK Inhibitor through NOXA-Mediated MCL1 Degradation in Triple-Negative and Inflammatory Breast Cancer

MCL1 三阴性乳腺癌 癌症研究 组蛋白脱乙酰酶抑制剂 炎症性乳腺癌 组蛋白脱乙酰基酶 乳腺癌 癌症 联合疗法 表观遗传疗法 靶向治疗 医学 药理学 生物 内科学 下调和上调 组蛋白 基因表达 DNA甲基化 基因 生物化学
作者
Angie M. Torres-Adorno,Jangsoon Lee,Takahiro Kogawa,Peter Ordentlich,Debu Tripathy,Bora Lim,Naoto T. Ueno
出处
期刊:Clinical Cancer Research [American Association for Cancer Research]
卷期号:23 (16): 4780-4792 被引量:33
标识
DOI:10.1158/1078-0432.ccr-16-2622
摘要

Abstract Purpose: Inflammatory breast cancer (IBC), diagnosed clinically, and triple-negative breast cancer (TNBC), diagnosed by molecular receptor status, are the two most aggressive forms of breast cancer, and both lack effective targeted therapies. We previously demonstrated involvement of histone deacetylase (HDAC) inhibitor entinostat in regulating apoptosis in IBC and TNBC cells; here, we aimed to identify novel combination therapy candidates. Experimental Design: Potential therapeutic targets were identified by mRNA expression profiling of TNBC and IBC cells treated with entinostat. Drug action and synergism were assessed by in vitro proliferation assays, tumor growth in vivo, and proteomic analyses. Gain/loss-of-expression studies were utilized to functionally validate the role of identified targets in sensitivity of TNBC and IBC cells to combination therapy. Results: Entinostat induced activity of the oncogenic ERK pathway and expression of proapoptotic NOXA. These are known to stabilize and degrade, respectively, MCL1, an antiapoptotic Bcl-2 protein. In breast cancer patients, high-MCL1/low-NOXA tumor expression correlated significantly with poor survival outcomes. Combination treatment of entinostat with MEK inhibitor pimasertib reduced the growth of TNBC and IBC cells in vitro and inhibited tumor growth in vivo. The synergistic action of combination therapy was observed in TNBC and IBC cell lines in which NOXA expression was induced following entinostat treatment. The therapeutic activity depended on induction of mitochondrial cell death pathways initiated by NOXA-mediated MCL1 degradation. Conclusions: Our preclinical findings provide a rationale for the clinical testing of combination HDAC and MEK pathway inhibition for TNBC and IBC that exhibit elevated baseline tumor MCL1 expression. Clin Cancer Res; 23(16); 4780–92. ©2017 AACR.
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