MicroRNA-150 inhibits tumor invasion and metastasis by targeting the chemokine receptor CCR6, in advanced cutaneous T-cell lymphoma.

Abstract

In this study, we show that microRNA-150 (miR-150) is significantly downregulated in advanced cutaneous T-cell lymphoma (CTCL), and that this downregulation is strongly associated with tumor invasion/metastasis. Inoculation of CTCL cell lines into nonobese diabetic/Shi-scid interleukin 2γ (IL-2γ) null mice led to CTCL cell migration to multiple organs; however, prior transfection of the cells with miR-150 substantially reduced the invasion/metastasis by directly downregulating CCR6, a specific receptor for the chemokine CCL20. We also found that IL-22 and its specific receptor subunit, IL22RA1, were aberrantly overexpressed in advanced CTCL, and that production of IL-22 and CCL20 was increased in cultured CTCL cells. IL22RA1 knockdown specifically reduced CCL20 production in CTCL cells, suggesting that IL-22 upregulation may activate the production of CCL20 and its binding to CCR6, thereby enhancing the multidirectional migration potential of CTCL cells. CTCL cells also exhibited nutrition- and CCL20-dependent chemotaxis, which were inhibited by miR-150 transfection or CCR6 knockdown. From these findings, we conclude that, in the presence of continuous CCR6 upregulation accompanied by miR-150 downregulation, IL-22 activation leads to continuous CCL20-CCR6 interaction in CTCL cells and, in turn, autocrine metastasis to distal organs. This suggests miR-150, CCL20, and CCR6 could be key targets for the treatment of advanced CTCL.

• Authors: Mitsugu Ito, Kazuaki Teshima, Sho Ikeda, Akihiro Kitadate, Atsushi Watanabe, Miho Nara, Junsuke Yamashita, Koichi Ohshima, Kenichi Sawada, Hiroyuki Tagawa
• Journal: Blood (Blood) Vol. 123 Issue 10 Pg. 1499-511 (Mar 06 2014) ISSN: 1528-0020 [Electronic] United States
• PMID: 24385540 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Chemokine CCL20
• Interleukins
• MIRN150 microRNA, human
• MicroRNAs
• Receptors, CCR6

Topics

• Animals
• Autocrine Communication
• Cell Line, Tumor
• Chemokine CCL20 (genetics, metabolism)
• Chemotaxis (genetics)
• Cluster Analysis
• Disease Models, Animal
• Gene Expression
• Gene Expression Regulation, Neoplastic
• Gene Knockdown Techniques
• Genes, Tumor Suppressor
• Humans
• Interleukins (genetics, metabolism)
• Lymphoma, T-Cell, Cutaneous (genetics, mortality, pathology)
• Mice
• MicroRNAs (genetics)
• Neoplasm Invasiveness (genetics)
• Neoplasm Metastasis (genetics)
• Neoplasm Staging
• RNA Interference
• Receptors, CCR6 (genetics)
• Transfection
• Xenograft Model Antitumor Assays
• Interleukin-22