期刊
FASEB JOURNAL
卷 33, 期 4, 页码 5457-5467出版社
FEDERATION AMER SOC EXP BIOL
DOI: 10.1096/fj.201801853RR
关键词
MC degranulation; ECs; cytokines; inflammation; extracellular RNA
资金
- German Research Foundation (DFG) (Bonn, Germany) [SFB-TR84, FI543/4-1, TR1137/2-1]
- von Behring-Rontgen Foundation (Marburg, Germany) [62780212]
- Excellence Cluster Cardio-Pulmonary System (ECCPS) (Giessen, Germany)
Tissue-resident mast cells (MCs) are well known for their role in inflammatory responses and allergic and anaphylactic reactions, but they also contribute to processes of arterial remodeling. Although ribosomes and cytosolic RNAs are located around secretory granules in mature MCs, their functional role in MC responses remains unexplored. Previous studies by our group characterized extracellular RNA (eRNA) as an inflammatory and pathogenetic factor in vitro and in vivo. In the present study, RNA-containing MCs and eRNA were located in close proximity to growing collateral arteries in vivo. In vitro, various agonists were found to induce the degranulation of MCs and the concomitant release of eRNA in association with microvesicles (MVs). The liberation of eRNA from MCs was abolished by MC stabilizers or by preventing the increase of intracellular Ca2+ in MCs. eRNA was found to be mainly contained inside MVs, as demonstrated by electron microscopy and immunocytochemistry. The exposure to and the uptake of MC-released MVs by cultured endothelial cells increased their expression of cytokines, such as monocyte chemoattractant protein or IL-6, in a dose- and time-dependent manner. These results indicate that RNA-containing MC-derived MVs are likely to be involved in inflammatory responses, relevant, for example, to processes of vascular remodeling.
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