Small extracellular vesicle‐derived miR‐574‐5p regulates PGE2‐biosynthesis via TLR7/8 in lung cancer

• Published in: Journal of extracellular vesicles 2021-10, Vol.10 (12), p.e12143-n/a
• Main Authors: Donzelli, Julia, Proestler, Eva, Riedel, Anna, Nevermann, Sheila, Hertel, Brigitte, Guenther, Andreas, Gattenlöhner, Stefan, Savai, Rajkumar, Larsson, Karin, Saul, Meike J.
• Format: Article
• Language: English
• Subjects: Adenocarcinoma; Biomarkers; Biosynthesis; Carcinoma, Non-Small-Cell Lung - genetics; Carcinoma, Non-Small-Cell Lung - pathology; Cell culture; Cell interactions; Cell Line, Tumor; Extracellular vesicles; extracellular vesicles (sEV); Extracellular Vesicles - metabolism; Fibroblasts; Humans; Intracellular; Lung cancer; Lung Neoplasms - genetics; Lung Neoplasms - pathology; Medicin och hälsovetenskap; microsomal prostaglandin E synthase 1 (mPGES‐1); miRNA; miR‐574‐5p; Patients; Prostaglandin E2; prostaglandin E2 (PGE2); Proteins; Squamous cell carcinoma; TLR7 protein; Toll-Like Receptor 7 - metabolism; Toll-like receptors; toll‐like receptor 7/8 (TLR7/8); Transfection
• ISSN: 2001-3078; 2001-3078
• DOI: 10.1002/jev2.12143

Intercellular communication plays an essential role in lung cancer (LC). One of the major players in cell‐cell‐communication is small extracellular vesicles (sEV). SEV trigger various biological responses by transporting cellular cargo to target cells. One essential sEV component are microRNAs (miRs), whose transport has recently attracted increasing research interest. We report that prostaglandin E2 (PGE2), a key inflammatory lipid mediator, specifically induces the sorting of miR‐574‐5p in sEV of A549 and 2106T cells. We found that sEV‐derived miR‐574‐5p activates Toll‐like receptors (TLR) 7/8, thereby decreasing PGE2‐levels. In contrast, intracellular miR‐574‐5p induces PGE2‐biosynthesis. Consequently, the combination of intracellular and sEV‐derived miR‐574‐5p controls PGE2‐levels via a feedback loop. This was only observed in adeno‐ but not in squamous cell carcinoma, indicating a cell‐specific response to sEV‐derived miRs, which might be due to unique tetraspanin compositions. Hence, we describe a novel function of miR‐574‐5p unique to adenocarcinoma. Intracellular miR‐574‐5p induces PGE2 and thus the secretion of sEV‐derived miR‐574‐5p, which in turn decreases PGE2‐biosynthesis in recipient cells.