Abstract:
:Deregulated expression of microRNAs has been associated with angiogenesis. Studying the miRNome of locally advanced breast tumors we unsuspectedly found a dramatically repression of miR-204, a small non-coding RNA with no previous involvement in tumor angiogenesis. Downregulation of miR-204 was confirmed in an independent cohort of patients and breast cancer cell lines. Gain-of-function analysis indicates that ectopic expression of miR-204 impairs cell proliferation, anchorage-independent growth, migration, invasion, and the formation of 3D capillary networks in vitro. Likewise, in vivo vascularization and angiogenesis were suppressed by miR-204 in a nu/nu mice model. Genome-wide profiling of MDA-MB-231 cells expressing miR-204 revealed changes in the expression of hundred cancer-related genes. Of these, we focused on the study of pro-angiogenic ANGPT1 and TGFβR2. Functional analysis using luciferase reporter and rescue assays confirmed that ANGPT1 and TGFβR2 are novel effectors downstream of miR-204. Accordingly, an inverse correlation between miR-204 and ANGPT1/TGFβR2 expression was found in breast tumors. Knockdown of TGFβR2, but not ANGPT1, impairs cell proliferation and migration whereas inhibition of both genes inhibits angiogenesis. Taken altogether, our findings reveal a novel role for miR-204/ANGPT1/TGFβR2 axis in tumor angiogenesis. We propose that therapeutic manipulation of miR-204 levels may represent a promising approach in breast cancer.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Flores-Pérez A,Marchat LA,Rodríguez-Cuevas S,Bautista-Piña V,Hidalgo-Miranda A,Ocampo EA,Martínez MS,Palma-Flores C,Fonseca-Sánchez MA,Astudillo-de la Vega H,Ruíz-García E,González-Barrios JA,Pérez-Plasencia C,Streber ML,Lópedoi
10.1038/srep34504subject
Has Abstractpub_date
2016-10-05 00:00:00pages
34504issn
2045-2322pii
srep34504journal_volume
6pub_type
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