Journal
ONCOGENE
Volume 30, Issue 7, Pages 806-821Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/onc.2010.465
Keywords
microRNA; siRNA; integrin; angiogenesis; tumorigenesis
Funding
- Heart and Stroke Foundation of Ontario [NA6282, CI5958]
- Canadian Institutes of Health Research [MOP-102635]
- China Scholarship Council
- Ontario Women's Health Council/CIHR
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It has been reported that the miR-106b similar to 25 cluster, a paralog of the miR-17 similar to 92 cluster, possesses oncogenic activities. However, the precise role of each microRNA (miRNA) in the miR-106b similar to 25 cluster is not yet known. In this study, we examined the function of miR-93, one of the microRNAs within the miR-106b similar to 25 cluster, in angiogenesis and tumor formation. We found that miR-93 enhanced cell survival, promoted sphere formation and augmented tumor growth. Most strikingly, when miR-93-overexpressing U87 cells were co-cultured with endothelial cells, they supported endothelial cell spreading, growth, migration and tube formation. In vivo studies revealed that miR-93-expressing cells induced blood vessel formation, allowing blood vessels to extend to tumor tissues in high densities. Angiogenesis promoted by miR-93 in return facilitated cell survival, resulting in enhanced tumor growth. We further showed that integrin-beta 8 is a target of miR-93. Higher levels of integrin-beta 8 are associated with cell death in tumor mass and in human glioblastoma. Silencing of integrin-beta 8 expression using small interfering RNA promoted cell proliferation, whereas ectopic expression of integrin-beta 8 decreased cell growth. These findings showed that miR-93 promotes tumor growth and angiogenesis by suppressing, at least in part, integrin-beta 8 expression. Our results suggest that inhibition of miR-93 function may be a feasible approach to suppress angiogenesis and tumor growth. Oncogene (2011) 30, 806-821; doi:10.1038/onc.2010.465; published online 18 October 2010
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