Functions of miR-146a and miR-222 in Tumor-associated Macrophages in Breast Cancer.

Abstract:

:Tumor-associated macrophages (TAMs) play critical roles in promoting tumor progression and invasion. However, the molecular mechanisms underlying TAM regulation remain to be further investigated and may make significant contributions to cancer treatment. Mammalian microRNAs (miRNAs) have recently been identified as important regulators of gene expression that function by repressing specific target genes mainly at the post-transcriptional level. However, systematic studies of the functions and mechanisms of miRNAs in TAMs in tumor tissues are rare. In this study, miR-146a and miR-222 were shown to be significantly decreased in TAMs associated with the up-regulated NF-κB p50 subunit. miR-146a promoted the expression of some M2 macrophage phenotype molecules, and miR-146a antagomir transfected RAW264.7 monocyte-macrophage cells inhibited 4T1 tumor growth in vivo. Meanwhile, overexpression of miR-222 inhibited TAM chemotaxis, and miR-222 in TAMs inhibited 4T1 tumor growth by targeting CXCL12 and inhibiting CXCR4. These data revealed that miRNAs influence breast tumor growth by promoting the M2 type polarization or regulating the recruitment of TAMs. These observations suggest that endogenous miRNAs may exert an important role in controlling the polarization and function of TAMs in breast cancer.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Li Y,Zhao L,Shi B,Ma S,Xu Z,Ge Y,Liu Y,Zheng D,Shi J

doi

10.1038/srep18648

subject

Has Abstract

pub_date

2015-12-22 00:00:00

pages

18648

issn

2045-2322

pii

srep18648

journal_volume

5

pub_type

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