Journal
EXPERIMENTAL AND MOLECULAR MEDICINE
Volume 46, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/emm.2014.63
Keywords
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Funding
- National Natural Science Foundation Projects [31000386, 81370971]
- Guangdong Natural Science Funds for Distinguished Young Scholar [S2013050013880]
- Medical Science Youth Training Projects of PLA [13QNP077]
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Dysregulated microRNA (miRNA) expression has a critical role in tumor development and metastasis. However, the mechanism by which miRNAs control melanoma metastasis is unknown. Here, we report reduced miR-98 expression in melanoma tissues with increasing tumor stage as well as metastasis; its expression is also negatively associated with melanoma patient survival. Furthermore, we demonstrate that miR-98 inhibits melanoma cell migration in vitro as well as metastatic tumor size in vivo. We also found that IL-6 is a target gene of miR-98, and IL-6 represses miR-98 levels via the Stat3-NF-kappa B-lin28B pathway. In an in vivo melanoma model, we demonstrate that miR-98 reduces melanoma metastasis and increases survival in part by reducing IL-6 levels; it also decreases Stat3 and p65 phosphorylation as well as lin28B mRNA levels. These results suggest that miR-98 inhibits melanoma metastasis in part through a novel miR-98-IL-6-negative feedback loop.
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