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Angiotensin II affects inflammation mechanisms via AMPK-related signalling pathways in HL-1 atrial myocytes
- Angiotensin II affects inflammation mechanisms via AMPK-related signalling pathways in HL-1 atrial myocytes
- Kim N.; Jung Y.; Nam M.; Sun Kang M.; Lee M.K.; Cho Y.; Choi E.-K.; Hwang G.-S.; Soo Kim H.
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- Scientific Reports
- vol. 7, no. 1
- Nature Publishing Group
- SCI; SCIE; SCOPUS
- Inflammation is a common cause of cardiac arrhythmia. Angiotensin II (Ang II) is a major contributing factor in the pathogenesis of cardiac inflammation; however, its underlying molecular mechanism remains unclear. Here, we explored the effect of Ang II on inflammatory mechanisms and oxidative stress using HL-1 atrial myocytes. We showed that Ang II activated c-Jun N-terminal kinase (JNK) phosphorylation and other inflammatory markers, such as transforming growth factor-β1 (TGF-β1) and tumor necrosis factor-α (TNF-α). Ang II decreased oxygen consumption rate, which resulted in reactive oxygen species (ROS) generation and inhibition of ROS blocked Ang II-mediated JNK phosphorylation and TGF-β1 induction. Ang II induced the expression of its specific receptor, AT1R. Ang II-induced intracellular calcium production associated with Ang II-mediated signalling pathways. In addition, the generated ROS and calcium stimulated AMPK phosphorylation. Inhibiting AMPK blocked Ang II-mediated JNK and TGF-β signalling pathways. Ang II concentration, along with TGF-β1 and tumor necrosis factor-α levels, was slightly increased in plasma of patients with atrial fibrillation. Taken together, these results suggest that Ang II induces inflammation mechanisms through an AMPK-related signalling pathway. Our results provide new molecular targets for the development of therapeutics for inflammation-related conditions, such as atrial fibrillation. © 2017 The Author(s).
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- 자연과학대학 > 화학·나노과학전공 > Journal papers
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