Oral squamous cell carcinoma-derived exosomes promote M2 subtype macrophage polarization mediated by exosome-enclosed miR-29a-3p.

American Journal of Physiology. Cell Physiology
Jinghua CaiWei He

Abstract

This study aims to explore the mechanism of the signal transmission between oral squamous cell carcinoma (OSCC) and unpolarized stromal immune macrophages mediated by OSCC-derived exosomes (OSCC-Exo). Polarization of macrophages was found by detection of the level of protein markers or specific components for M1 subtype or M2 subtype macrophages, respectively. Exosomes extracted from two OSCC cell lines, which might have been transfected with micro-RNA (miR)-29a-3p inhibitor or mimic, were cocultured with macrophages to ensure the effect of exosome-enclosed miR-29a-3p on the polarization of macrophages. miR-29a-3p is highly expressed, suppressor of cytokine signaling 1 (SOCS1) is low expressed and phosphorylated signal transduction and transcriptional activator 6 (p-STAT6) is highly expressed in OSCC tissues. Upregulation of miR-29a-3p is observed in OSCC-derived exosomes. When cocultured, OSCC-derived exosomes promote M2 subtype macrophage polarization and the medium of the coculture promotes the proliferation and invasion of SCC-9 and CAL-27 cells. After interfered silencing miR-29a-3p of OSCCs, SCC-9- and CAL-27 cell-derived exosomes inhibit M2 subtype macrophage polarization. On the other hand, cellular highly expressed miR...Continue Reading

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Citations

Feb 15, 2020·International Journal of Molecular Sciences·Tami YapAntonio Celentano
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Methods Mentioned

BETA
flow cytometry
PMA
Precipitation
PCR
electrophoresis
ELISA
transfection
xenograft

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