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Journal Article
Research Support, Non-U.S. Gov't
Inhibition of ACAA1 Restrains Proliferation and Potentiates the Response to CDK4/6 Inhibitors in Triple-Negative Breast Cancer.
Cancer Research 2023 May 16
UNLABELLED: Triple-negative breast cancer (TNBC) is an aggressive subtype of breast cancer with unfavorable outcomes. Developing therapeutic targets for TNBC remains a challenge. Here, we identified that acetyl-CoA acyltransferase 1 (ACAA1) is highly expressed in the luminal androgen receptor (LAR) subtype of TNBC compared with adjacent normal tissues in our TNBC proteomics dataset. Inhibition of ACAA1 restrained TNBC proliferation and potentiated the response to the cyclin-dependent kinase 4 and 6 (CDK4/6) inhibitor abemaciclib. Mechanistically, ACAA1 interacted with CDK4, and the inhibition of ACAA1 blocked RB transcriptional corepressor 1 (RB1) phosphorylation, resulting in G1-S cell-cycle arrest. Importantly, trimetazidine, a traditional drug for ischemic heart disease, caused a decrease in ACAA1 protein levels and enhanced the efficacy of abemaciclib in preclinical TNBC models. In conclusion, this study identifies that ACAA1 is a therapeutic target in TNBC and suggests the combination of trimetazidine and abemaciclib could be beneficial for ACAA1-high TNBCs.
SIGNIFICANCE: ACAA1 is highly expressed in TNBC, serving as a potential therapeutic target in ACAA1-high tumors and a predictive biomarker of resistance to CDK4/6 inhibitors for RB1-proficient patients.
SIGNIFICANCE: ACAA1 is highly expressed in TNBC, serving as a potential therapeutic target in ACAA1-high tumors and a predictive biomarker of resistance to CDK4/6 inhibitors for RB1-proficient patients.
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