Internal associations and dynamic expression of c-kit and nanog genes in ventricular remodelling induced by adriamycin

Liu,Zhen; Li,Shuo; Liu,Lingling; Guo,Zhikun; Wang,Pengfei

doi:10.3892/etm.2016.3522

Internal associations and dynamic expression of c-kit and nanog genes in ventricular remodelling induced by adriamycin

Authors:
- Zhen Liu
- Shuo Li
- Lingling Liu
- Zhikun Guo
- Pengfei Wang
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Affiliations: Department of Cardiology, Xinxiang Central Hospital, Xinxiang, Henan 453003, P.R. China, Key Laboratory for Medical Tissue Regeneration, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
Published online on: July 14, 2016 https://doi.org/10.3892/etm.2016.3522
Pages: 1657-1662
Copyright: © Liu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The present study aimed to investigate the dynamic expression of the c‑kit and nanog genes in rats with left ventricular remodelling induced by adriamycin (ADR), and explore its internal association and mechanism of action. Sprague-Dawley male rats were randomly divided into a normal control group and a heart failure model group. Heart failure was induced by a single intraperitoneal injection of ADR (4 mg/kg) weekly for six weeks. The normal control group was given the same amount of saline. At the eighth week, rat cardiac function was examined to demonstrate the formation of heart failure. The rat hearts were harvested frozen and sectioned, and the expression levels of the nanog and c‑kit genes in the myocardial tissue samples were detected using immunohistochemistry, immunofluorescence and reverse transcription‑polymerase chain reaction (RT‑PCR). Hematoxylin and eosin staining demonstrated various pathological changes in the myocardial cells in the heart failure model group, whereas myocardial infarction was not observed in the normal control group. Immunohistochemistry and immunofluorescence demonstrated that nanog‑positive cells were predominantly expressed in the vascular endothelium, with a few myocardial cells and stem cells in normal myocardium. The expression levels of c‑kit and nanog in the myocardium of the rats with heart failure decreased significantly. c‑kit‑positive cells clustered together in the epicardium and its vicinity, and c‑kit expression significantly decreased in the myocardium of rats with heart failure, as compared with normal rats. In both groups, some cells co‑expressed both the c‑kit and nanog genes. The RT‑PCR results demonstrated that the expression levels of the two genes in the heart failure model group were significantly lower compared with those in the normal control group (P<0.05). In conclusion, the c‑kit‑ and nanog‑positive stem cells decreased in the myocardium of the rats with left ventricular remodelling induced by ADR. Their abnormal expression was significantly correlated with left ventricular remodelling, thereby indicating an internal association (influences of two indexes in the experimental group and control group) between them.

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