Angiotensin II affects inflammation mechanisms via AMPK-related signalling pathways in HL-1 atrial myocytes

Nami Kim, Youngae Jung, Miso Nam, Mi Sun Kang, Min Kyung Lee, Youngjin Cho, Eue Keun Choi, Geum Sook Hwang, Hyeon Soo Kim

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number10328
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Angiotensin II affects inflammation mechanisms via AMPK-related signalling pathways in HL-1 atrial myocytes'. Together they form a unique fingerprint.

  • Cite this