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MicroRNA-208a (miR-208a) exacerbated cardiomyocyte apoptosis via inhibiting nemo-like kinase (NLK). miR-208a is a crucial molecule in the regulation of heart diseases, however, the biological function and underlying mechanism of miR-208a in the progression of cardiomyocyte apoptosis is not clearly elucidated. We hypothesized that miR-208a might potentiate cardiomyocyte apoptosis through inhibiting NLK.', 'Male Sprague-Dawley rats were underwent permanent coronary artery ligation to establish myocardial infarction (MI) model. The quantitative real-time RT-PCR (qRT-PCR) was used to evaluate the expression of miR-208a and NLK mRNA. Western blot was applied to detect NLK and Bcl-2 proteins expression. Luciferase reporter assay was performed to indentify NLK as a target of miR-208a. The apoptosis of H9C2 cells was assessed by flow cytometry (FCM).', 'miR-208a was upregulated accompanying with a significant decrease of NLK in response to MI, and stronger miR-208a staining was detected by in situ hybridization in the cytoplasm of cardiomyocytes in MI group compared to the sham group. In vitro, overexpression of miR-208a greatly enhance Ang II-induced the apoptosis of H9C2 cells through downregulating of NLK and the anti-apoptosis protein Bcl-2 expression, whereas these effects were reversed when miR-208a was downregulated. Dual luciferase reporter assay and western blot results demonstrated that NLK was a direct target of miR-208a. Interestingly, upregulation of NLK obviously increased Bcl-2 expression and reduced the percentage of apoptotic cells, while attenuation of NLK reduced the level of Bcl-2 and cells apoptosis after treatment with Ang II.
Output:
Does microRNA-208a potentiate Angiotensin II-triggered Cardiac Myoblasts Apoptosis via Inhibiting Nemo-like Kinase ( NLK )?