Research Paper Volume 14, Issue 11 pp 4755—4768

LINC00094/miR-19a-3p/CYP19A1 axis affects the sensitivity of ER positive breast cancer cells to Letrozole through EMT pathway

Yuan Xiang1, , Hui Liu2, , Hao Hu2, , Le-Wei Li2, , Qi-Bei Zong2, , Tang-Wei Wu1, , Xiao-Yi Li1, , Shi-Qiang Fang1, , Yi-Wen Liu1, , Yu Zhan1, , Hui Wang1, &, , Zhong-Xin Lu1, ,

  • 1 Department of Medical Laboratory, Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, 430014, Hubei, P.R. China
  • 2 Institute of Biology and Medicine, College of Life and Health Sciences, Wuhan University of Science and Technology, 430081, Hubei, P.R. China

Received: November 25, 2021       Accepted: May 17, 2022       Published: June 2, 2022
How to Cite

Copyright: © 2022 Xiang et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


The endocrine therapy resistance of breast cancer is the difficulty and challenge to be urgently solved in the current treatment. In this study, we examined the effects of noncoding RNA LINC00094 and miR-19a-3p on breast cancer in vivo and in vitro by RT-QPCR, Western Blot, luciferase assay, immunofluorescence and drug sensitivity tests. The plasma level of CYP19A1 in patients with breast cancer resistance was lower than that in drug sensitive patients. Compared with normal subjects, miR-19a-3p was highly expressed in plasma of patients with breast cancer. miR-19a-3p is highly expressed in estrogen receptor positive breast cancer cells. The expression of miR-19a-3p promoted the migration and EMT of breast cancer cells and reduced the sensitivity of breast cancer to Letrozole. LINC00094 sponge adsorbed miR-19a-3p. LINC00094 promotes the expression of CYP19A1, the target gene of miR-19a-3p, and inhibits the EMT process of breast cancer, ultimately promoting the sensitivity of ER-positive breast cancer cells to Letrozole. This study found a new mechanism of Letrozole sensitivity in ER positive breast cancer.


ER: Estrogen Receptor; EMT: epithelial mesenchymal transition; FITC: fluorescein isothiocyanate; DAPI: 4’,6-diamidino-2-phenylindole; RT-QPCR: real-time qPCR; PVDF: polyvinylidene fluoride; NC: negative control; TCGA: The Cancer Genome Atlas Program.