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J Infect Dis. 2016 Dec 1;214(11):1773-1783. Epub 2016 Sep 28.

MicroRNA-125b Prevents Cardiac Dysfunction in Polymicrobial Sepsis by Targeting TRAF6-Mediated Nuclear Factor κB Activation and p53-Mediated Apoptotic Signaling.

Author information

1
Department of Surgery.
2
Department of Geriatrics, First Affiliated Hospital of Nanjing Medical University.
3
Center of Excellence in Inflammation, Infectious Disease, and Immunity, James H. Quillen College of Medicine, East Tennessee State University, Johnson City.
4
Department of Internal Medicine, Third Affiliated Hospital of Harbin Medical University, Harbin, China.
5
Department of Biometry and Medical Computing.

Abstract

BACKGROUND:

 This study examined the effect of microRNA-125b (miR-125b) on sepsis-induced cardiac dysfunction.

METHODS:

 Mouse hearts were transfected with lentivirus expressing miR-125b (LmiR-125b) 7 days before cecal ligation and puncture (CLP)-induced sepsis. Cardiac function was examined by echocardiography before and 6 hours after CLP (n = 6/group). Survival was monitored following CLP-induced sepsis (n = 12/group).

RESULTS:

 LmiR-125b transfection significantly attenuated cardiac dysfunction due to CLP-induced sepsis. Fractional shortening and ejection fraction values were significantly (P < .05) higher in the LmiR-125b-treated CLP group than in the untreated CLP group. Survival outcome in LmiR-125b-transfected septic mice was markedly improved, compared with mice with CLP-induced sepsis. Transfection of LmiR-125b into the heart significantly suppressed the expression of ICAM-1 and VCAM-1, decreased the accumulation of macrophages and neutrophils in the myocardium, and decreased serum levels of tumor necrosis factor α and interleukin 1β by targeting tumor necrosis factor receptor-associated factor 6 (TRAF6)-mediated nuclear factor κB (NF-κB) activation. In addition, sepsis-induced myocardial apoptosis was markedly attenuated by LmiR-125b transfection through suppression of p53, Bax, and Bak1 expression. In vitro transfection of endothelial cells with miR-125b mimics attenuate LPS-induced ICAM-1 and VCAM-1 expression by suppressing TRAF6 and NF-κB activation.

CONCLUSIONS:

 Increased myocardial miR-125b expression attenuates sepsis-induced cardiac dysfunction and improves survival. miR-125b may be a target for septic cardiomyopathy.

KEYWORDS:

NF-κB; TRAF6; apoptosis; cardiac function; microRNA-125b; sepsis

PMID:
27683819
PMCID:
PMC5144735
DOI:
10.1093/infdis/jiw449
[Indexed for MEDLINE]
Free PMC Article

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