Wenjun Shen1, Gong Chen2, Rui Dong3, Rui Zhao4, Shan Zheng5. 1. Department of Pediatric Surgery, Children's Hospital of Fudan University, Shanghai 201102, China. Electronic address: doc_albert@126.com. 2. Department of Pediatric Surgery, Children's Hospital of Fudan University, Shanghai 201102, China. Electronic address: chengongzlp@hotmail.com. 3. Department of Pediatric Surgery, Children's Hospital of Fudan University, Shanghai 201102, China. Electronic address: dongrui_1982@126.com. 4. Department of Pediatric Surgery, Children's Hospital of Fudan University, Shanghai 201102, China. Electronic address: zhao007rui007@sina.com. 5. Department of Pediatric Surgery, Children's Hospital of Fudan University, Shanghai 201102, China. Electronic address: szheng@shmu.edu.cn.
Abstract
BACKGROUND: MicroRNAs (miRNAs) are short, noncoding RNA molecules that act as post-transcriptional negative regulators of target mRNAs. Increasing evidence suggests that miRNAs are involved in liver fibrotic processes. Biliary atresia (BA) is characterized by rapid and progressive liver fibrosis. Therefore, we investigated the role of miRNA-21in the pathogenesis of BA. METHODS: We collected liver samples from patients with BA or liver trauma to examine the role of miRNA-21. We examined RNA expression of miRNA-21, phosphatase and tensin homolog deleted on chromosome ten (PTEN), and α-smooth muscle actin (α-SMA) in liver tissue using real-time fluorescence quantitative PCR. Western blot analyses and immunohistochemical staining were performed to evaluate protein expression of PTEN, α-SMA, and phosphorylated AKT in liver. RESULTS: We found that miRNA-21was upregulated in liver samples from BA patients, whereas PTEN negatively correlated with suppression of the 3'-untranslated region (3'-UTR). Activation of the downstream AKT pathway provoked liver fibrosis by enhancing α-SMA levels. CONCLUSIONS: The miRNA-21/PTEN/AKT axis promotes the fibrosis process in BA, which might be a potential therapeutic target to improve the prognosis of patients with BA.
BACKGROUND: MicroRNAs (miRNAs) are short, noncoding RNA molecules that act as post-transcriptional negative regulators of target mRNAs. Increasing evidence suggests that miRNAs are involved in liver fibrotic processes. Biliary atresia (BA) is characterized by rapid and progressive liver fibrosis. Therefore, we investigated the role of miRNA-21in the pathogenesis of BA. METHODS: We collected liver samples from patients with BA or liver trauma to examine the role of miRNA-21. We examined RNA expression of miRNA-21, phosphatase and tensin homolog deleted on chromosome ten (PTEN), and α-smooth muscle actin (α-SMA) in liver tissue using real-time fluorescence quantitative PCR. Western blot analyses and immunohistochemical staining were performed to evaluate protein expression of PTEN, α-SMA, and phosphorylated AKT in liver. RESULTS: We found that miRNA-21was upregulated in liver samples from BA patients, whereas PTEN negatively correlated with suppression of the 3'-untranslated region (3'-UTR). Activation of the downstream AKT pathway provoked liver fibrosis by enhancing α-SMA levels. CONCLUSIONS: The miRNA-21/PTEN/AKT axis promotes the fibrosis process in BA, which might be a potential therapeutic target to improve the prognosis of patients with BA.
Authors: Angela C Cheung; Maria J Lorenzo Pisarello; Nicholas F LaRusso Journal: Biochim Biophys Acta Mol Basis Dis Date: 2017-07-15 Impact factor: 5.187
Authors: Maria Jose Lorenzo Pisarello; Lorena Loarca; Tommy Ivanics; Leslie Morton; Nicholas LaRusso Journal: J Clin Med Date: 2015-08-26 Impact factor: 4.241