miR-142-3p prevents macrophage differentiation during cancer-induced myelopoiesis.

Immunity 2013 Jun 27

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Tumor progression is accompanied by an altered myelopoiesis causing the accumulation of immunosuppressive cells. Here, we showed that miR-142-3p downregulation promoted macrophage differentiation and determined the acquisition of their immunosuppressive function in tumor. Tumor-released cytokines signaling through gp130, the common subunit of the interleukin-6 cytokine receptor family, induced the LAP∗ isoform of C/EBPβ transcription factor, promoting macrophage generation. miR-142-3p downregulated gp130 by canonical binding to its messenger RNA (mRNA) 3' UTR and repressed C/EBPβ LAP∗ by noncanonical binding to its 5' mRNA coding sequence. Enforced miR expression impaired macrophage differentiation both in vitro and in vivo. Mice constitutively expressing miR-142-3p in the bone marrow showed a marked increase in survival following immunotherapy with tumor-specific T lymphocytes. By modulating a specific miR in bone marrow precursors, we thus demonstrated the feasibility of altering tumor-induced macrophage differentiation as a potent tool to improve the efficacy of cancer immunotherapy. Copyright © 2013 Elsevier Inc. All rights reserved.

Citation

Nada Sonda, Francesca Simonato, Elisa Peranzoni, Bianca Calì, Stefania Bortoluzzi, Andrea Bisognin, Ena Wang, Francesco M Marincola, Luigi Naldini, Bernhard Gentner, Christian Trautwein, Sara Dutton Sackett, Paola Zanovello, Barbara Molon, Vincenzo Bronte. miR-142-3p prevents macrophage differentiation during cancer-induced myelopoiesis. Immunity. 2013 Jun 27;38(6):1236-49