Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 288, Issue 32, Pages 23586-23596Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M113.489302
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Funding
- National Natural Science Foundation of China [31200969, 31200874, 81101330, 31271378, 81250044]
- National Science Fund for Distinguished Young Scholars [81025019]
- Natural Science Foundation of Jiangsu Province [BK2011013, BK2012014]
- program for New Century Excellent Talents in University from the Ministry of Education, China [NCET-12-0261]
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Recent studies by our group and others show that microRNAs can be actively secreted into the extracellular environment through microvesicles (MVs) and function as secretory signaling molecules that influence the recipient cell phenotypes. Here we investigate the role of monocyte-secreted miR-150 in promoting the capillary tube formation of endothelial cells and in enhancing angiogenesis. In vitro capillary tube formation and in vivo angiogenesis assays showed that monocyte-derived MVs have strong pro-angiogenic activities. By depleting miR-150 from monocytic MVs and increasing miR-150 in MVs derived from cells that normally contain low levels of miR-150, we further demonstrated that the miR-150 content accounted for the pro-angiogenic activity of monocytic MVs in these assays. Using tumor-implanted mice and ob/ob mice as models, we revealed that miR-150 secretion, which is increased for diseases such as cancers and diabetes, significantly promotes angiogenesis. The delivery of anti-miR-150 antisense oligonucleotides into tumor-implanted mice and ob/ob mice via MVs, however, strongly reduced angiogenesis in both types of mice. Our results collectively demonstrate that secretion of miR-150 via MVs can promote angiogenesis in vitro and in vivo, and we also present a novel microRNA-based therapeutic approach for disease treatment.
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