Publication:
MicroRNA-200c Attenuates the Tumor-Infiltrating Capacity of Macrophages.

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Date

2022-02-22

Authors

Raue, Rebecca
Frank, Ann-Christin
Fuhrmann, Dominik C
de la Cruz-Ojeda, Patricia
Rösser, Silvia
Bauer, Rebekka
Cardamone, Giulia
Weigert, Andreas
Syed, Shahzad Nawaz
Schmid, Tobias

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Abstract

Macrophages constitute a major part of the tumor-infiltrating immune cells. Within the tumor microenvironment, they acquire an alternatively activated, tumor-supporting phenotype. Factors released by tumor cells are crucial for the recruitment of tumor-associated macrophages. In the present project, we aimed to understand the role of hsa-miR-200c-3p (miR-200c) in the interplay between tumor cells and macrophages. To this end, we employed a coculture system of MCF7 breast tumor cells and primary human macrophages and observed the transfer of miR-200c from apoptotic tumor cells to macrophages, which required intact CD36 receptor in macrophages. We further comprehensively determined miR-200c targets in macrophages by mRNA-sequencing and identified numerous migration-associated mRNAs to be downregulated by miR-200c. Consequently, miR-200c attenuated macrophage infiltration into 3-dimensional tumor spheroids. miR-200c-mediated reduction in infiltration further correlated with a miR-200c migration signature comprised of the four miR-200c-repressed, predicted targets PPM1F, RAB11FIB2, RDX, and MSN.

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breast tumor, macrophage, miR, tumor microenvironment

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