Zhan Yanxia, Du Junxian, Min Zhihui, Ma Li, Zhang Wei, Zhu Wei, Liu Yonglei
Department of Hematology, Zhongshan Hospital, Fudan University, Shanghai, China.
Research Center, Zhongshan Hospital, Fudan University, Shanghai, China.
Cell Death Discov. 2021 Jun 12;7(1):141. doi: 10.1038/s41420-021-00506-z.
Hypoxia is a common phenomenon in solid tumors. The roles of exosomes from hypoxic breast cancer stroma are less studied. So, the study was aimed to investigate the role of exosomes from hypoxic cancer-associated fibroblasts (CAFs) cells in breast cancer. The circRNA array analysis was performed to screen differential expressed circRNAs between hypoxic and normoxic CAFs exosomes. Candidate circHIF1A (circ_0032138) was screened out and it was confirmed that circHIF1A was up-regulated in the exosomes from hypoxic CAFs and their exosomes. Through investigating cellular functions including cell proliferation and stem cell features, it was demonstrated that hypoxic CAFs exosomes transferred circHIF1A into breast cancer cells, which played an important role in cancer stem cell properties sponging miR-580-5p by regulating CD44 expression. In a summary, circHIF1A from hypoxic CAFs exosomes played an important role in stem cell properties of breast cancer. CircHIF1A may act as a target molecule of breast cancer therapy.
缺氧是实体瘤中的常见现象。低氧乳腺癌基质来源的外泌体的作用研究较少。因此,本研究旨在探讨低氧癌相关成纤维细胞(CAFs)来源的外泌体在乳腺癌中的作用。进行环状RNA阵列分析以筛选低氧和常氧CAFs外泌体之间差异表达的环状RNA。筛选出候选环状HIF1A(circ_0032138),并证实其在低氧CAFs来源的外泌体及其外泌体中上调。通过研究包括细胞增殖和干细胞特性在内的细胞功能,证明低氧CAFs外泌体将circHIF1A转移至乳腺癌细胞中,其通过调节CD44表达在癌症干细胞特性中发挥重要作用,海绵化miR-580-5p。总之,低氧CAFs外泌体中的circHIF1A在乳腺癌干细胞特性中发挥重要作用。CircHIF1A可能作为乳腺癌治疗的靶分子。
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