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2018 ; 2018
(ä): 3181278
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TLR4 Activation Promotes the Progression of Experimental Autoimmune Myocarditis
to Dilated Cardiomyopathy by Inducing Mitochondrial Dynamic Imbalance
#MMPMID30046376
Wu B
; Li J
; Ni H
; Zhuang X
; Qi Z
; Chen Q
; Wen Z
; Shi H
; Luo X
; Jin B
Oxid Med Cell Longev
2018[]; 2018
(ä): 3181278
PMID30046376
show ga
Mitochondrial dynamic imbalance associates with several cardiovascular diseases.
However, the role of mitochondrial dynamics in TLR4 activation-mediated dilated
cardiomyopathy (DCM) progress remains unknown. A model of experimental autoimmune
myocarditis (EAM) was established in BALB/c mice on which TLR4 activation by
LPS-EB or TLR4 inhibition by LPS-RS was performed to induce chronic inflammation
for 5 weeks. TLR4 activation promoted the transition of EAM to DCM as
demonstrated by increased cardiomyocyte apoptosis, myocardial fibrosis,
ventricular dilatation, and declined heart function. TLR4 inhibition mitigated
the above DCM changes. Transmission electron microscope study showed that
mitochondria became fragmented, also with damaged crista in ultrastructure in EAM
mice. TLR4 activation aggravated the above mitochondrial aberration, and TLR4
inhibition alleviated it. The mitochondrial dynamic imbalance and damage in DCM
development were mainly associated with OPA1 downregulation, which may be caused
by elevated TNF-? level and ROS stress after TLR4 activation. Furthermore,
OMA1/YME1L abnormal degradation was involved in the OPA1 dysfunction, and
intervening OMA1/YME1L in H9C2 significantly alleviated mitochondrial fission,
ultrastructure damage, and cell apoptosis induced by TNF-? and ROS. These data
indicate that TLR4 activation resulted in OPA1 dysfunction, promoting
mitochondrial dynamic imbalance and damage, which may involve in the progress of
EAM to DCM.