三阴性乳腺癌
癌症研究
紫杉醇
乳腺癌
小RNA
癌变
医学
异位表达
癌症
细胞生长
细胞培养
生物
内科学
基因
遗传学
生物化学
作者
Xiaoping Li,Hailin Tang,Jianping Chen,Cailu Song,Lu Yang,Peng Liu,Neng Wang,Xinwei Lin
出处
期刊:Oncotarget
[Impact Journals, LLC]
日期:2015-05-08
卷期号:6 (24): 20070-20083
被引量:58
标识
DOI:10.18632/oncotarget.4039
摘要
Triple-negative breast cancer is the most aggressive breast cancer subtype. The aim of our study was to investigate the functional role of both miR-101 and MCL-1 in the sensitivity of human triple-negative breast cancer (TNBC) to paclitaxel. We found that the expression of miR-101 was strongly decreased in triple-negative breast cancer tissues and cell lines. The expression of miR-101 was not associated with clinical stage or lymph node infiltration in TNBC. Ectopic overexpression of miR-101 inhibit growth and induced apoptosis in vitro and suppressed tumorigenicity in vivo. MCL-1 was significantly overexpressed in most of the TNBC tissues and cell lines. Luciferase assay results confirmed MCL-1 as a direct target gene of miR-101. MiR-101 inhibited MCL-1 expression in TNBC cells and transplanted tumors. There was a negative correlation between the level of expression of miR-101 and MCL-1 in TNBC tissues. Suppression of MCL-1 enhanced the sensitivity of MDA-MB-435 cells to paclitaxel. Furthermore, miR-101 increased paclitaxel sensitivity by inhibiting MCL-1 expression. Our findings provide significant insight into the molecular mechanisms of TNBC carcinogenesis and may have clinical relevance for the development of novel, targeted therapies for TNBC.
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