5-aminolevulinic acid combined with sodium ferrous citrate ameliorates H2O2-induced cardiomyocyte hypertrophy via activation of the MAPK/Nrf2/HO-1 pathway.

Abstract

Hydrogen peroxide (H2O2) causes cell damage via oxidative stress. Heme oxygenase-1 (HO-1) is an antioxidant enzyme that can protect cardiomyocytes against oxidative stress. In this study, we investigated whether the heme precursor 5-aminolevulinic acid (5-ALA) with sodium ferrous citrate (SFC) could protect cardiomyocytes from H2O2-induced hypertrophy via modulation of HO-1 expression. HL-1 cells pretreated with/without 5-ALA and SFC were exposed to H2O2 to induce a cardiomyocyte hypertrophy model. Hypertrophy was evaluated by planar morphometry, (3)H-leucine incorporation, and RT-PCR analysis of hypertrophy-related gene expressions. Reactive oxygen species (ROS) production was assessed by 5/6-chloromethyl-2',7'-ichlorodihydrofluorescein diacetate acetylester. HO-1 and nuclear factor erythroid 2-related factor 2 (Nrf2) protein expressions were analyzed by Western blot. In our experiments, HL-1 cells were transfected with Nrf2 siRNA or treated with a signal pathway inhibitor. We found several results. 1) ROS production, cell surface area, protein synthesis, and expressions of hypertrophic marker genes, including atrial natriuretic peptide, brain natriuretic peptide, atrial natriuretic factor, and β-myosin heavy chain, were decreased in HL-1 cells pretreated with 5-ALA and SFC. 2) 5-ALA and SFC increased HO-1 expression in a dose- and time-dependent manner, associated with upregulation of Nrf2. Notably, Nrf2 siRNA dramatically reduced HO-1 expression in HL-1 cells. 3) ERK1/2, p38, and SAPK/JNK signaling pathways were activated and modulate 5-ALA- and SFC-enhanced HO-1 expression. SB203580 (p38 kinase), PD98059 (ERK), or SP600125 (JNK) inhibitors significantly reduced this effect. In conclusion, our data suggest that 5-ALA and SFC protect HL-1 cells from H2O2-induced cardiac hypertrophy via activation of the MAPK/Nrf2/HO-1 signaling pathway.

• Authors: Mingyi Zhao, Huiming Guo, Jimei Chen, M Fujino, H Ito, K Takahashi, F Abe, M Nakajima, T Tanaka, Jinju Wang, Huanlei Huang, Shaoyi Zheng, Mingyan Hei, Jiaxin Li, Shuai Huang, Jiani Li, Xiaotang Ma, Yanfang Chen, Lingling Zhao, Jian Zhuang, Ping Zhu, X K Li
• Journal: American journal of physiology. Cell physiology (Am J Physiol Cell Physiol) Vol. 308 Issue 8 Pg. C665-72 (Apr 15 2015) ISSN: 1522-1563 [Electronic] United States
• PMID: 25652453 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2015 the American Physiological Society.

Chemical References

• Antioxidants
• Ferrous Compounds
• Membrane Proteins
• NF-E2-Related Factor 2
• Nfe2l2 protein, mouse
• RNA, Small Interfering
• Natriuretic Peptide, Brain
• Citric Acid
• ferrous citrate
• Atrial Natriuretic Factor
• Aminolevulinic Acid
• Hydrogen Peroxide
• Heme Oxygenase-1
• Hmox1 protein, mouse
• Mitogen-Activated Protein Kinases
• Ventricular Myosins
• Myosin Heavy Chains

Topics

• Aminolevulinic Acid (pharmacology)
• Animals
• Antioxidants (pharmacology)
• Atrial Natriuretic Factor (metabolism)
• Cardiomegaly (drug therapy, pathology)
• Cell Line
• Citric Acid
• Ferrous Compounds (pharmacology)
• Heme Oxygenase-1 (biosynthesis, metabolism)
• Hydrogen Peroxide (pharmacology)
• Membrane Proteins (biosynthesis, metabolism)
• Mice
• Mitogen-Activated Protein Kinases (antagonists & inhibitors, metabolism)
• Myocytes, Cardiac (pathology)
• Myosin Heavy Chains (metabolism)
• NF-E2-Related Factor 2 (genetics, metabolism)
• Natriuretic Peptide, Brain (metabolism)
• Oxidative Stress
• RNA Interference
• RNA, Small Interfering
• Signal Transduction
• Ventricular Myosins (metabolism)