Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA.
Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA.
Cancer Lett. 2018 Dec 1;438:165-173. doi: 10.1016/j.canlet.2018.09.022. Epub 2018 Sep 15.
Triple-negative breast cancer (TNBC) is the most difficult subtype of breast cancer to treat due to a paucity of effective targeted therapies. Many studies have reported that breast cancer stem cells (BCSCs) are enriched in TNBC and are responsible for chemoresistance and metastasis. In this study, we identify LRP8 as a novel positive regulator of BCSCs in TNBC. LRP8 is highly expressed in TNBC compared to other breast cancer subtypes and its genomic locus is amplified in 24% of TNBC tumors. Knockdown of LRP8 in TNBC cell lines inhibits Wnt/β-catenin signaling, decreases BCSCs, and suppresses tumorigenic potential in xenograft models. LRP8 knockdown also induces a more differentiated, luminal-epithelial phenotype and thus sensitizes the TNBC cells to chemotherapy. Together, our study highlights LRP8 as a novel therapeutic target for TNBC as inhibition of LRP8 can attenuate Wnt/β-catenin signaling to suppress BCSCs.
三阴性乳腺癌(TNBC)是最难治疗的乳腺癌亚型,因为缺乏有效的靶向治疗方法。许多研究报告称,乳腺癌干细胞(BCSCs)在 TNBC 中富集,并负责化疗耐药和转移。在这项研究中,我们确定 LRP8 是 TNBC 中 BCSCs 的新型正调控因子。LRP8 在 TNBC 中比其他乳腺癌亚型表达更高,其基因组位点在 24%的 TNBC 肿瘤中扩增。在 TNBC 细胞系中敲低 LRP8 可抑制 Wnt/β-catenin 信号通路,减少 BCSCs,并抑制异种移植模型中的肿瘤发生潜能。LRP8 敲低还诱导更分化的腔上皮表型,从而使 TNBC 细胞对化疗更敏感。总之,我们的研究强调了 LRP8 作为 TNBC 的一个新的治疗靶点,因为抑制 LRP8 可以减弱 Wnt/β-catenin 信号通路,从而抑制 BCSCs。