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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Extracell+Vesicles
2015 ; 4
(ä): 28388
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Suppression of autophagy by extracellular vesicles promotes myofibroblast
differentiation in COPD pathogenesis
#MMPMID26563733
Fujita Y
; Araya J
; Ito S
; Kobayashi K
; Kosaka N
; Yoshioka Y
; Kadota T
; Hara H
; Kuwano K
; Ochiya T
J Extracell Vesicles
2015[]; 4
(ä): 28388
PMID26563733
show ga
Extracellular vesicles (EVs), such as exosomes and microvesicles, encapsulate
proteins and microRNAs (miRNAs) as new modulators of both intercellular crosstalk
and disease pathogenesis. The composition of EVs is modified by various triggers
to maintain physiological homeostasis. In response to cigarette smoke exposure,
the lungs develop emphysema, myofibroblast accumulation and airway remodelling,
which contribute to chronic obstructive pulmonary disease (COPD). However, the
lung disease pathogenesis through modified EVs in stress physiology is not
understood. Here, we investigated an EV-mediated intercellular communication
mechanism between primary human bronchial epithelial cells (HBECs) and lung
fibroblasts (LFs) and discovered that cigarette smoke extract (CSE)-induced
HBEC-derived EVs promote myofibroblast differentiation in LFs. Thorough
evaluations of the modified EVs and COPD lung samples showed that cigarette smoke
induced relative upregulation of cellular and EV miR-210 expression of bronchial
epithelial cells. Using co-culture assays, we showed that HBEC-derived EV miR-210
promotes myofibroblast differentiation in LFs. Surprisingly, we found that
miR-210 directly regulates autophagy processes via targeting ATG7, and expression
levels of miR-210 are inversely correlated with ATG7 expression in LFs.
Importantly, autophagy induction was significantly decreased in LFs from COPD
patients, and silencing ATG7 in LFs led to myofibroblast differentiation. These
findings demonstrate that CSE triggers the modification of EV components and
identify bronchial epithelial cell-derived miR-210 as a paracrine autophagy
mediator of myofibroblast differentiation that has potential as a therapeutic
target for COPD. Our findings show that stressor exposure changes EV compositions
as emerging factors, potentially controlling pathological disorders such as
airway remodelling in COPD.