Tumor-derived microRNA-494 promotes angiogenesis in non-small cell lung cancer.

Abstract:

:Angiogenesis, a crucial step in tumor growth and metastasis, is regulated by various pro- or anti-angiogenic factors. Recently, microRNAs have been shown to modulate angiogenic processes by modulating the expression of critical angiogenic factors. However, roles of tumor-derived microRNAs in regulating tumor vascularization remain to be elucidated. In this study, we found that delivery of miR-494 into human vascular endothelial cells (ECs) enhanced the EC migration and promoted angiogenesis. The angiogenic effect of miR-494 was mediated by the targeting of PTEN and the subsequent activation of Akt/eNOS pathway. Importantly, co-culture experiments demonstrated that a lung cancer cell line, A549, secreted and delivered miR-494 into ECs via a microvesicle-mediated route. In addition, we found that the expression of miR-494 was induced in the tumor cells in response to hypoxia, likely via a HIF-1α-mediated mechanism. Furthermore, a specific miR-494 antagomiR effectively inhibited angiogenesis and attenuated the growth of tumor xenografts in nude mice. Taken together, these results demonstrated that miR-494 is a novel tumor-derived paracrine signal to promote angiogenesis and tumor growth under hypoxic condition.

journal_name

Angiogenesis

journal_title

Angiogenesis

authors

Mao G,Liu Y,Fang X,Liu Y,Fang L,Lin L,Liu X,Wang N

doi

10.1007/s10456-015-9474-5

subject

Has Abstract

pub_date

2015-07-01 00:00:00

pages

373-82

issue

3

eissn

0969-6970

issn

1573-7209

journal_volume

18

pub_type

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