Induction of HO-1 by carbon monoxide releasing molecule-2 attenuates thrombin-induced COX-2 expression and hypertrophy in primary human cardiomyocytes.

Abstract

Carbon monoxide (CO) is one of the cytoprotective byproducts of heme oxygenase (HO)-1 and exerts anti-inflammatory action in various models. However, the detailed mechanisms underlying CO-induced HO-1 expression in primary human cardiomyocytes remain largely unidentified. We used primary left ventricle myocytes as a model and applied CO releasing molecule (CORM)-2 to investigate the relationship of CO and HO-1 expression. We herein used Western blot, real-time PCR, promoter activity and EIA to investigate the role of HO-1 expression protecting against thrombin-mediated responses. We found that thrombin-induced COX-2 expression, PGE2 release and cardiomyocyte hypertrophy markers (increase in ANF/BNP, α-actin expression and cell surface area) was attenuated by pretreatment with CORM-2 which was partially reversed by hemoglobin (Hb) or ZnPP (an inhibitor of HO-1 activity), suggesting that HO-1/CO system may be of clinical importance to ameliorate heart failure through inhibition of inflammatory responses. CORM-2-induced HO-1 protein expression, mRNA and promoter was attenuated by pretreatment with the inhibitors of Pyk2 (PF431396), PDGFR (AG1296), PI3K (LY294002), Akt (SH-5), p38 (SB202530), JNK1/2 (SP600125), FoxO1 (AS1842856) and Sp1 (mithramycin A). The involvement of these signaling components was further confirmed by transfection with respective siRNAs, consistent with those of pharmacological inhibitors. These results suggested that CORM-2-induced HO-1 expression is mediated through a Pyk2/PDGFR/PI3K/Akt/FoxO1/Sp1-dependent manner and exerts a cytoprotective effect in human cardiomyocytes.

• Authors: Peter Tzu-Yu Chien, Chih-Chung Lin, Li-Der Hsiao, Chuen-Mao Yang
• Journal: Toxicology and applied pharmacology (Toxicol Appl Pharmacol) Vol. 289 Issue 2 Pg. 349-59 (Dec 01 2015) ISSN: 1096-0333 [Electronic] United States
• PMID: 26385185 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2015 Elsevier Inc. All rights reserved.

Chemical References

• Actins
• Enzyme Inhibitors
• Organometallic Compounds
• tricarbonyldichlororuthenium (II) dimer
• Natriuretic Peptide, Brain
• Carbon Dioxide
• Atrial Natriuretic Factor
• HMOX1 protein, human
• Heme Oxygenase-1
• Cyclooxygenase 2
• PTGS2 protein, human
• Thrombin
• Dinoprostone

Topics

• Actins (metabolism)
• Atrial Natriuretic Factor (metabolism)
• Carbon Dioxide (metabolism, pharmacology)
• Cardiomegaly (chemically induced, enzymology, genetics, pathology, prevention & control)
• Cells, Cultured
• Cyclooxygenase 2 (genetics, metabolism)
• Cytoprotection
• Dinoprostone (metabolism)
• Dose-Response Relationship, Drug
• Enzyme Induction
• Enzyme Inhibitors (pharmacology)
• Heme Oxygenase-1 (antagonists & inhibitors, biosynthesis, genetics)
• Humans
• Myocytes, Cardiac (drug effects, enzymology, pathology)
• Natriuretic Peptide, Brain (metabolism)
• Organometallic Compounds (metabolism, pharmacology)
• Primary Cell Culture
• RNA Interference
• Signal Transduction (drug effects)
• Thrombin (pharmacology)
• Time Factors
• Transfection