Angiotensin II upregulated the expression of microRNA‑224 but not microRNA‑21 in adult rat cardiac fibroblasts

Ning,Qilan; Jiang,Xiaoying

doi:10.3892/br.2013.144

Angiotensin II upregulated the expression of microRNA‑224 but not microRNA‑21 in adult rat cardiac fibroblasts

Authors:
- Qilan Ning
- Xiaoying Jiang
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Affiliations: Department of Genetics and Molecular Biology, School of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
Published online on: July 22, 2013 https://doi.org/10.3892/br.2013.144
Pages: 776-780

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Abstract

The role of microRNA‑21 (miRNA‑21, miR‑21) in cardiac fibrosis remains controversial, while the role of microRNA‑224 (miRNA‑224, miR‑224) in cardiac fibroblasts has not been reported. Angiotensin II (Ang II) is known to play a pivotal role in the pathogenesis of cardiac fibrosis. The aim of this study was to confirm whether the expression of miR‑21 and miR‑224 is regulated by Ang II in adult rat cardiac fibroblasts. Semi‑quantitative reverse transcription‑polymerase chain reaction (RT‑PCR) and quantitative PCR (qPCR) were performed to measure the levels of miR‑21 and miR‑224 in Ang II‑treated or untreated adult rat cardiac fibroblasts. The RT‑PCR, qPCR and previous miRNA array results demonstrated that treatment with Ang II (100 nM) for 24 h did not induce the increase of miR‑21 in cardiac fibroblasts, although the level of miR‑21 in cardiac fibroblasts was not considered as low. The results of the present study also demonstrated that Ang II significantly upregulated the expression of miR‑224 in adult rat cardiac fibroblasts. Bioinformatic analysis revealed that the potential target genes of miR‑224 included SMAD4, SMAD5, cyclin‑dependent kinase 9 and early growth response 1/2. In previous studies, it was reported that miR‑224 was upregulated in tumors by promoting cell proliferation and targeting SMAD4. Those results indicated the potential roles of miR‑224 in cardiac fibroblasts and cardiac fibrosis. In conclusion, results of the present study demonstrated that miR‑21 was not induced by Ang II, whereas Ang II upregulated miR‑224 expression in adult rat cardiac fibroblasts, a finding that may provide a starting point for the investigation of the potential role of miR‑224 in cardiac fibrosis.

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