Microvesicles secreted by macrophages shuttle invasion-potentiating microRNAs into breast cancer cells

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• 作者：Mei Yang (1) (2)
  Jingqi Chen (1)
  Fang Su (3)
  Bin Yu (2)
  Fengxi Su (1)
  Ling Lin (1) (4)
  Yujie Liu (1)
  Jian-Dong Huang (2)
  Erwei Song (1)
  
• 刊名：Molecular Cancer
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：10
• 期：1
• 全文大小：589KB
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• 作者单位：Mei Yang (1) (2)
  Jingqi Chen (1)
  Fang Su (3)
  Bin Yu (2)
  Fengxi Su (1)
  Ling Lin (1) (4)
  Yujie Liu (1)
  Jian-Dong Huang (2)
  Erwei Song (1)
  
  1. Breast Tumor Center, Sun-Yat-Sen Memorial Hospital, Sun-Yat-Sen University, Guangzhou, PR China
  2. Department of Biochemistry, University of Hong Kong, Pokfulam, Hong Kong SAR, China
  3. LIN BAI-XIN Research Center of Medicine, Sun-Yat-Sen Memorial Hospital, Sun-Yat-Sen University, Guangzhou, PR China
  4. Department of Rheumatology, The First Affiliated Hospital, Shantou University Medical College, Shantou city, Guangdong, PR China
  
• ISSN：1476-4598

文摘

Background Tumor-associated macrophages (TAMs) are alternatively activated cells induced by interleukin-4 (IL-4)-releasing CD4+ T cells. TAMs promote breast cancer invasion and metastasis; however, the mechanisms underlying these interactions between macrophages and tumor cells that lead to cancer metastasis remain elusive. Previous studies have found microRNAs (miRNAs) circulating in the peripheral blood and have identified microvesicles, or exosomes, as mediators of cell-cell communication. Therefore, one alternative mechanism for the promotion of breast cancer cell invasion by TAMs may be through macrophage-secreted exosomes, which would deliver invasion-potentiating miRNAs to breast cancer cells. Results We utilized a co-culture system with IL-4-activated macrophages and breast cancer cells to verify that miRNAs are transported from macrophages to breast cancer cells. The shuttling of fluorescently-labeled exogenous miRNAs from IL-4-activated macrophages to co-cultivated breast cancer cells without direct cell-cell contact was observed. miR-223, a miRNA specific for IL-4-activated macrophages, was detected within the exosomes released by macrophages and was significantly elevated in the co-cultivated SKBR3 and MDA-MB-231 cells. The invasiveness of the co-cultivated breast cancer cells decreased when the IL-4-activated macrophages were treated with a miR-223 antisense oligonucleotide (ASO) that would inhibit miR-223 expression. Furthermore, results from a functional assay revealed that miR-223 promoted the invasion of breast cancer cells via the Mef2c-β-catenin pathway. Conclusions We conclude that macrophages regulate the invasiveness of breast cancer cells through exosome-mediated delivery of oncogenic miRNAs. Our data provide insight into the mechanisms underlying the metastasis-promoting interactions between macrophages and breast cancer cells.