title: Role of miRNA-1 in regulating connexin 43 in ischemia-reperfusion heart injury: a rat model.
abstract: MiRNA-1 may participate in regulating ischemia-reperfusion injury (IRI) by affecting the expression and distribution of connexin 43 (Cx43). The aim of this study is to investigate miR-1 expression and its potential role in regulating Cx43 during ischemic postconditioning (IPOST) in a rat model. Fifty-five Wistar male rats were randomly divided into five groups: N, IR, IPOST, agomir-1, and antagomir-1 group. The hearts were perfused with the Langendorff system. The reperfusion arrhythmia (RA) and myocardial infarct size were observed and recorded. The miRNA-1 expression and the Cx43 expression and distribution were assessed by RT-PCR, immunoblotting, and immunohistochemistry. First, the RA score in the IR group was higher than that in the control group, whereas there was no difference between the IPOST and antagomir-1 groups. Second, the myocardial infarct size was larger in the agomir-1 than in the IPOST group; there was no difference between the antagomir-1 and the IPOST group. Third, the miRNA-1 expression increased by 78% in the agomir-1 group but decreased by 32% in the antagomir-1 group compared with the IPOST group. Fourth, compared with the Control group, the Cx43 expression in the IR group decreased, the Cx43 expression decreased in the agomir-1 group compared with the IPOST group. Fifth, the distribution of Cx43 was irregular and disorganized in the IR and agomir-1 groups. In the IPOST and antagomir-1 groups, Cx43 was neatly distributed in the intercalated disk area. Our findings suggest that IPOST can inhibit the up-regulation of miRNA-1 induced by ischemia-reperfusion and that the down-regulation of miRNA-1 can prevent the decrease and redistribution of Cx43, which will protect the heart from IRI.
authors.affiliation: Cardiology Department, Tianjin Medical University General Hospital, Tianjin, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Bian
authors.affiliation: Cardiology Department, Tianjin Medical University General Hospital, Tianjin, China. Electronic address: tjyuxuefang@163.com.
authors.forename: Xue-Fang
authors.initials: XF
authors.lastname: Yu
authors.affiliation: Cardiology Department, Tianjin Medical University General Hospital, Tianjin, China.
authors.forename: Guo-Qin
authors.initials: GQ
authors.lastname: Wang
authors.affiliation: Cardiology Department, Tianjin Medical University General Hospital, Tianjin, China.
authors.forename: Tian-Ming
authors.initials: TM
authors.lastname: Teng
mesh_terms: D000818:Animals; D015153:Blotting, Western; D018031:Connexin 43 / Q000096:biosynthesis* / Q000235:genetics; D004195:Disease Models, Animal; D005786:Gene Expression Regulation / Q000502:physiology*; D007150:Immunohistochemistry; D057775:Ischemic Postconditioning; D000067268:Isolated Heart Preparation; D008297:Male; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism*; D015428:Myocardial Reperfusion Injury / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D051381:Rats; D017208:Rats, Wistar; D060888:Real-Time Polymerase Chain Reaction
chemical_list: D018031:Connexin 43; C580592:Gja1 protein, rat; D035683:MicroRNAs
keywords: Connexin 43; Ischemia post-conditioning; Reperfusion arrhythmia; miRNA-1