Pulsed Ultrasound Promotes Secretion of Anti-inflammatory Extracellular Vesicles from Skeletal Myotubes Via Elevation of Intracellular Calcium Level

Overview

Journal Elife

Specialty Biology

Date 2023 Dec 6

PMID 38054662

Authors

Atomu Yamaguchi

Noriaki Maeshige

Hikari Noguchi

Jiawei Yan

Xiaoqi Ma

Mikiko Uemura

Dongming Su

Hiroyo Kondo

Kristopher Sarosiek

Hidemi Fujino

Affiliations

Soon will be listed here.

Abstract

The regulation of inflammatory responses is an important intervention in biological function and macrophages play an essential role during inflammation. Skeletal muscle is the largest organ in the human body and releases various factors which mediate anti-inflammatory/immune modulatory effects. Recently, the roles of extracellular vesicles (EVs) from a large variety of cells are reported. In particular, EVs released from skeletal muscle are attracting attention due to their therapeutic effects on dysfunctional organs and tissues. Also, ultrasound (US) promotes release of EVs from skeletal muscle. In this study, we investigated the output parameters and mechanisms of US-induced EV release enhancement and the potential of US-treated skeletal muscle-derived EVs in the regulation of inflammatory responses in macrophages. High-intensity US (3.0 W/cm) irradiation increased EV secretion from C2C12 murine muscle cells via elevating intracellular Ca level without negative effects. Moreover, US-induced EVs suppressed expression levels of pro-inflammatory factors in macrophages. miRNA sequencing analysis revealed that miR-206-3p and miR-378a-3p were especially abundant in skeletal myotube-derived EVs. In this study we demonstrated that high-intensity US promotes the release of anti-inflammatory EVs from skeletal myotubes and exert anti-inflammatory effects on macrophages.

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