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Chu Q, Zhang Y, Zhong S, Gao F, Chen Y, Wang B, Zhang Z, Cai W, Li W, Zheng F, Shi G. N-n-Butyl Haloperidol Iodide Ameliorates Oxidative Stress in Mitochondria Induced by Hypoxia/Reoxygenation through the Mitochondrial c-Jun N-Terminal Kinase/Sab/Src/Reactive Oxygen Species Pathway in H9c2 Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:7417561. [PMID: 31205589 PMCID: PMC6530120 DOI: 10.1155/2019/7417561] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 12/04/2018] [Accepted: 03/17/2019] [Indexed: 02/05/2023]
Abstract
Both c-Jun N-terminal kinase (JNK) and reactive oxygen species (ROS) play important roles in myocardial ischemia/reperfusion (I/R) injury. Our previous studies suggest that N-n-butyl haloperidol iodide (F2) exerts cardioprotection by reducing ROS production and JNK activation caused by I/R. In this study, we hypothesized that there is a JNK/Sab/Src/ROS pathway in the mitochondria in H9c2 cells following hypoxia/reoxygenation (H/R) that induces oxidative stress in the mitochondria and that F2 exerts mitochondrial protective effects during H/R injury by modulating this pathway. The results showed that H/R induced higher-level ROS in the cytoplasm on the one hand and JNK activation and translocation to the mitochondria by colocalization with Sab on the other. Moreover, H/R resulted in mitochondrial Src dephosphorylation, and subsequently, oxidative stress evidenced by the increase in ROS generation and oxidized cardiolipin in the mitochondrial membranes and by the decrease in mitochondrial superoxide dismutase activity and membrane potential. Furthermore, treatment with a JNK inhibitor or Sab small interfering RNA inhibited the mitochondrial translocation of p-JNK, decreased colocalization of p-JNK and Sab on the mitochondria, and reduced Src dephosphorylation and mitochondrial oxidative stress during H/R. In addition, Src dephosphorylation by inhibitor PP2 increased mitochondrial ROS production. F2, like inhibitors of the JNK/Sab/Src/ROS pathway, downregulated the H/R-induced mitochondrial translocation of p-JNK and the colocalization of p-JNK and Sab on the mitochondria, increased Src phosphorylation, and alleviated the above-mentioned mitochondrial oxidative stress. In conclusion, F2 could ameliorate H/R-associated oxidative stress in mitochondria in H9c2 cells through the mitochondrial JNK/Sab/Src/ROS pathway.
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Affiliation(s)
- Qianwen Chu
- Department of Pharmacy, Jiading District Central Hospital Affiliated Shanghai University of Medicine & Health Sciences, Shanghai 201800, China
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, China
| | - Yanmei Zhang
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, China
- Pharmaceutical Laboratory, The First Affiliated Hospital, Shantou University Medical College, Shantou 515041, China
| | - Shuping Zhong
- Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, USA
| | - Fenfei Gao
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, China
| | - Yicun Chen
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, China
| | - Bin Wang
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, China
| | - Zhaojing Zhang
- Department of Medical Genetics and Cell Biology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450003, China
| | - Wenfeng Cai
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, China
| | - Weiqiu Li
- Analytical Cytology Laboratory, Shantou University Medical College, Shantou 515041, China
| | - Fuchun Zheng
- Clinical Pharmacology Laboratory, The First Affiliated Hospital, Shantou University Medical College, Shantou 515041, China
| | - Ganggang Shi
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, China
- Pharmaceutical Laboratory, The First Affiliated Hospital, Shantou University Medical College, Shantou 515041, China
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Sun TL, Liu Z, Qi ZJ, Huang YP, Gao XQ, Zhang YY. (-)-Epigallocatechin-3-gallate (EGCG) attenuates arsenic-induced cardiotoxicity in rats. Food Chem Toxicol 2016; 93:102-10. [PMID: 27170490 DOI: 10.1016/j.fct.2016.05.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 04/12/2016] [Accepted: 05/06/2016] [Indexed: 11/16/2022]
Abstract
Chronic arsenic exposure in drinking water is associated with the abnormalities of cardiac tissue. Excessive generation of ROS induced by arsenic has a central role in arsenic-induced cardiotoxicity. (-)-Epigallocatechin-3-gallate (EGCG), the most abundant polyphenol in green tea, possesses a potent antioxidant capacity and exhibits extensive pharmacological activities. This study was aim to evaluate the effect of EGCG on arsenic-induced cardiotoxicity in vivo and in vitro. Treatment with NaAsO2 seriously affected the morphology and ultrastructure of myocardium, and induced cardiac injuries, oxidative stress, intracellular calcium accumulation and apoptosis in rats. In consistent with in vivo study, the injuries, oxidative stress and apoptosis were also observed in NaAsO2-treated H9c2 cells. All of these effects induced by NaAsO2 were attenuated by EGCG. These results suggest EGCG could attenuate NaAsO2-induced cardiotoxicity, and the mechanism may involve its potent antioxidant capacity.
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Affiliation(s)
- Tao-Li Sun
- Department of Pharmacology, Xiangnan College, Chenzhou, Hunan, 423000, China
| | - Zhi Liu
- Department of Pharmacology, Guizhou Medical University, Guiyang, Guizhou, 550004, China; Department of Urology Surgery and Oncology, The Second Affiliated Hospital of Guizhou Medical University, Kaili, Guizhou, 556000, China; Department of Histology and Embryology, Guizhou Medical University, Guiyang, Guizhou, 550004, China
| | - Zheng-Jun Qi
- Department of Urology Surgery and Oncology, The Second Affiliated Hospital of Guizhou Medical University, Kaili, Guizhou, 556000, China
| | - Yong-Pan Huang
- Department of Pharmacology, Guizhou Medical University, Guiyang, Guizhou, 550004, China; Department of Pharmacology, Central South University, Changsha, Hunan, 410078, China.
| | - Xiao-Qin Gao
- Department of Histology and Embryology, Guizhou Medical University, Guiyang, Guizhou, 550004, China
| | - Yan-Yan Zhang
- Department of Pharmacology, Guizhou Medical University, Guiyang, Guizhou, 550004, China
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Huang YP, Gao FF, Wang B, Zheng FC, Zhang YM, Chen YC, Huang ZQ, Zheng YS, Zhong SP, Shi GG. N-n-butyl haloperidol iodide inhibits H2O2-induced Na+/Ca2+-exchanger activation via the Na+/H+ exchanger in rat ventricular myocytes. Drug Des Devel Ther 2014; 8:1257-67. [PMID: 25246767 PMCID: PMC4166912 DOI: 10.2147/dddt.s63163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
N-n-butyl haloperidol iodide (F2), a novel compound, has shown palliative effects in myocardial ischemia/reperfusion (I/R) injury. In this study, we investigated the effects of F2 on the extracellular signal-regulated kinase kinase (MEK)/extracellular signal-regulated kinase (ERK)/Na(+)/H(+) exchanger (NHE)/Na(+)/Ca(2+) exchanger (NCX) signal-transduction pathway involved in H2O2-induced Ca(2+) overload, in order to probe the underlying molecular mechanism by which F2 antagonizes myocardial I/R injury. Acute exposure of rat cardiac myocytes to 100 μM H2O2 increased both NHE and NCX activities, as well as levels of phosphorylated MEK and ERK. The H2O2-induced increase in NCX current (I NCX) was nearly completely inhibited by the MEK inhibitor U0126 (1,4-diamino-2,3-dicyano-1,4-bis[o-aminophenylmercapto] butadiene), but only partly by the NHE inhibitor 5-(N,N-dimethyl)-amiloride (DMA), indicating the I NCX increase was primarily mediated by the MEK/mitogen-activated protein kinase (MAPK) pathway, and partially through activation of NHE. F2 attenuated the H2O2-induced I NCX increase in a concentration-dependent manner. To determine whether pathway inhibition was H2O2-specific, we examined the ability of F2 to inhibit MEK/ERK activation by epidermal growth factor (EGF), and NHE activation by angiotensin II. F2 not only inhibited H2O2-induced and EGF-induced MEK/ERK activation, but also completely blocked both H2O2-induced and angiotensin II-induced increases in NHE activity, suggesting that F2 directly inhibits MEK/ERK and NHE activation. These results show that F2 exerts multiple inhibitions on the signal-transduction pathway involved in H2O2-induced I NCX increase, providing an additional mechanism for F2 alleviating intracellular Ca(2+) overload to protect against myocardial I/R injury.
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Affiliation(s)
- Yong-Pan Huang
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
| | - Fen-Fei Gao
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
| | - Bin Wang
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
| | - Fu-Chun Zheng
- Department of Pharmacy, First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
| | - Yan-Mei Zhang
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
| | - Yi-Cun Chen
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
| | - Zhan-Qin Huang
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
| | - Yan-Shan Zheng
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
| | - Shu-Ping Zhong
- Department of Biochemistry and Molecular Biology, University of Southern California, Los Angeles, CA, USA
| | - Gang-Gang Shi
- Department of Pharmacology, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
- Department of Cardiovascular Diseases, First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong, People’s Republic of China
- Correspondence: Gang-Gang Shi, Department of Pharmacology, Shantou University Medical College, 22 Xinling Road, Shantou, Guangdong 515041, China, Tel +86 754 8890 0301, Fax +86 754 8855 7562, Email
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Scaringi JA, Rosa AO, Morad M, Cleemann L. A new method to detect rapid oxygen changes around cells: how quickly do calcium channels sense oxygen in cardiomyocytes? J Appl Physiol (1985) 2013; 115:1855-61. [PMID: 24157525 DOI: 10.1152/japplphysiol.00770.2013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Acute hypoxia is thought to trigger protective responses that, in tissues like heart and carotid body, include rapid (5-10 s) suppression of Ca(2+) and K(+) channels. To gain insight into the mechanism for the suppression of the cardiac l-type Ca(2+) channel, we measured O2-dependent fluorescence in the immediate vicinity of voltage-clamped cardiac cells subjected to rapid exchange of solutions with different O2 tensions. This was accomplished with an experimental chamber with a glass bottom that was used as a light guide for excitation of a thin ruthenium-based O2-sensitive ORMOSIL coating. Fluorescence imaging showed that steady-state Po2 was well controlled within the entire stream from an electromagnetically controlled solution "puffer" but that changes were slower at the periphery of the stream (τ1/2 ∼ 500 ms) than immediately around the voltage-clamped myocyte (τ1/2 ∼ 225 ms) where, in turn, firmly attached cells produced an additional local delay of 50-100 ms. Performing simultaneous voltage clamp and O2 measurements, we found that acute hypoxia gradually and reversibly suppressed the Ca(2+) channel (CaV1.2). Using Ba(2+) as charge carrier, the suppression was significant after 1.5 s, reached ∼10% after 2.5 s, and was nearly completely reversible in 5 s. The described fluorescence measurements provide the means to check and fine tune solution puffers and suggest that changes in Po2 can be accomplished within ∼200 ms. The rapid and reversible suppression of barium current under hypoxia is consistent with the notion that the cardiac Ca(2+) channel is directly modulated by O2.
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Affiliation(s)
- John A Scaringi
- Cardiac Signaling Center of University of South Carolina, Medical University of South Carolina, and Clemson University, Charleston, South Carolina
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Yan H, Li WL, Xu JJ, Zhu SQ, Long X, Che JP. D2 dopamine receptor antagonist raclopride induces non-canonical autophagy in cardiac myocytes. J Cell Biochem 2013; 114:103-10. [PMID: 22886761 DOI: 10.1002/jcb.24306] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Accepted: 07/23/2012] [Indexed: 12/19/2022]
Abstract
Cell death by autophagy is an important means of maintaining cellular homeostasis in adult cardiac myocytes. Autophagy was previously shown to exert a cardioprotective effect, suggesting that modulation of autophagy pathways is a potential therapeutic strategy in the treatment of heart disease. Although dopamine is known to induce autophagy in neuroblastoma cells, the underlying mechanism and the types of dopamine receptors involved in this process remain unclear. In this study, we used various dopamine receptor antagonists and agonists to identify the specific dopamine receptor that mediates induction of autophagy. We evaluated autophagy induction by the expression of autophagy markers in neonatal rat ventricular cardiac myocytes. We evaluated intracellular calcium levels using Fluo-3/AM and demonstrated autophagy-induced morphological changes in cardiac myocytes using electron microscopy. We also examined the pathway for dopamine-induced autophagy using RNAi-mediated gene knockdown. Raclopride, the well-documented D2 receptor antagonist, significantly upregulated autophagy in cardiac myocytes via an mTOR-independent pathway. There was no difference in intracellular calcium levels between raclopride-treated cells and untreated cells. siRNA-mediated knockdown of Rab9 resulted in decreased expression of autophagy markers in raclopride-treated cells. Interestingly, siRNA-mediated knockdown of Atg7 resulted in a significant increase in Rab9 levels in raclopride-treated cells, suggesting that blocking the classical autophagy pathway results in activation of an alternative pathway. Our study suggests that (1) the D2 dopamine receptor plays a role in autophagy and (2) raclopride mediated a non-canonical autophagy pathway in cardiac myocytes via Rab9.
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Affiliation(s)
- Hao Yan
- Department of Cardiac Surgery, Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, PR China
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Zhang YM, Wang CY, Zheng FC, Gao FF, Chen YC, Huang ZQ, Xia ZY, Irwin MG, Li WQ, Liu XP, Zheng YS, Xu H, Shi GG. Effects of N-n-butyl haloperidol iodide on the rat myocardial sarcoplasmic reticulum Ca(2+)-ATPase during ischemia/reperfusion. Biochem Biophys Res Commun 2012; 425:426-30. [PMID: 22846577 DOI: 10.1016/j.bbrc.2012.07.117] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Accepted: 07/20/2012] [Indexed: 02/05/2023]
Abstract
We have previously shown that N-n-butyl haloperidol iodide (F(2)), a newly synthesized compound, reduces ischemia/reperfusion (I/R) injury by preventing intracellular Ca(2+) overload through inhibiting L-type calcium channels and outward current of Na(+)/Ca(2+) exchanger. This study was to investigate the effects of F(2) on activity and protein expression of the rat myocardial sarcoplasmic reticulum Ca(2+)-ATPase (SERCA) during I/R to discover other molecular mechanisms by which F(2) maintains intracellular Ca(2+) homeostasis. In an in vivo rat model of myocardial I/R achieved by occluding coronary artery for 30-60 min followed by 0-120 min reperfusion, treatment with F(2) (0.25, 0.5, 1, 2 and 4 mg/kg, respectively) dose-dependently inhibited the I/R-induced decrease in SERCA activity. However, neither different durations of I/R nor different doses of F(2) altered the expression levels of myocardial SERCA2a protein. These results indicate that F(2) exerts cardioprotective effects against I/R injury by inhibiting I/R-mediated decrease in SERCA activity by a mechanism independent of SERCA2a protein levels modulation.
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Affiliation(s)
- Yan-Mei Zhang
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, Guangdong, China
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Zhang DW, Bian ZP, Xu JD, Wu HF, Gu CR, Zhou B, Chen XJ, Yang D. Astragaloside IV Alleviates Hypoxia/Reoxygenation-Induced Neonatal Rat Cardiomyocyte Injury via the Protein Kinase A Pathway. Pharmacology 2012; 90:95-101. [DOI: 10.1159/000339476] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2011] [Accepted: 05/14/2012] [Indexed: 11/19/2022]
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