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Chu W, Wan L, Zhao D, Qu X, Cai F, Huo R, Wang N, Zhu J, Zhang C, Zheng F, Cai R, Dong D, Lu Y, Yang B. Mild hypoxia-induced cardiomyocyte hypertrophy via up-regulation of HIF-1α-mediated TRPC signalling. J Cell Mol Med 2012; 16:2022-34. [PMID: 22129453 PMCID: PMC3822973 DOI: 10.1111/j.1582-4934.2011.01497.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Accepted: 11/23/2011] [Indexed: 11/30/2022] Open
Abstract
Hypoxia-inducible factor-1 alpha (HIF-1α) is a central transcriptional regulator of hypoxic response. The present study was designed to investigate the role of HIF-1α in mild hypoxia-induced cardiomyocytes hypertrophy and its underlying mechanism. Mild hypoxia (MH, 10% O(2)) caused hypertrophy in cultured neonatal rat cardiac myocytes, which was accompanied with increase of HIF-1α mRNA and accumulation of HIF-1α protein in nuclei. Transient receptor potential canonical (TRPC) channels including TRPC3 and TRPC6, except for TRPC1, were increased, and Ca(2+)-calcineurin signals were also enhanced in a time-dependent manner under MH condition. MH-induced cardiomyocytes hypertrophy, TRPC up-regulation and enhanced Ca(2+)-calcineurin signals were inhibited by an HIF-1α specific blocker, SC205346 (30 μM), whereas promoted by HIF-1α overexpression. Electrophysiological voltage-clamp demonstrated that DAG analogue, OAG (30 μM), induced TRPC current by as much as 170% in neonatal rat cardiomyocytes overexpressing HIF-1α compared to negative control. These results implicate that HIF-1α plays a key role in development of cardiac hypertrophy in responses to hypoxic stress. Its mechanism is associated with up-regulating TRPC3, TRPC6 expression, activating TRPC current and subsequently leading to enhanced Ca(2+)-calcineurin signals.
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MESH Headings
- Animals
- Blotting, Western
- Calcineurin/genetics
- Calcineurin/metabolism
- Cardiomegaly/genetics
- Cardiomegaly/pathology
- Cell Nucleus/genetics
- Cell Nucleus/metabolism
- Cells, Cultured
- Cloning, Molecular
- Fluorescent Antibody Technique
- Humans
- Hypertrophy
- Hypoxia-Inducible Factor 1, alpha Subunit/antagonists & inhibitors
- Hypoxia-Inducible Factor 1, alpha Subunit/genetics
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Myocytes, Cardiac/metabolism
- Myocytes, Cardiac/pathology
- Rats
- Rats, Wistar
- Sequence Analysis, DNA
- Signal Transduction/genetics
- TRPC Cation Channels/genetics
- TRPC Cation Channels/metabolism
- Transfection
- Up-Regulation
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Affiliation(s)
- Wenfeng Chu
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Lin Wan
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Dan Zhao
- Department of Pharmacy, the 2nd Affiliated Hospital, Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Xuefeng Qu
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Fulai Cai
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Rong Huo
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Ning Wang
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Jiuxin Zhu
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Chun Zhang
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Fangfang Zheng
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Ruijun Cai
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Deli Dong
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Yanjie Lu
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
| | - Baofeng Yang
- Department of Pharmacology (the State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), Harbin Medical UniversityHarbin, Heilongjiang, China
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