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Bassi R, Burgoyne JR, DeNicola GF, Rudyk O, DeSantis V, Charles RL, Eaton P, Marber MS. Redox-dependent dimerization of p38α mitogen-activated protein kinase with mitogen-activated protein kinase kinase 3. J Biol Chem 2017; 292:16161-16173. [PMID: 28739872 PMCID: PMC5625047 DOI: 10.1074/jbc.m117.785410] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 07/13/2017] [Indexed: 11/08/2022] Open
Abstract
The kinase p38α MAPK (p38α) plays a pivotal role in many biological processes. p38α is activated by canonical upstream kinases that phosphorylate the activation region. The purpose of our study was to determine whether such activation may depend on redox-sensing cysteines within p38α. p38α was activated and formed a disulfide-bound heterodimer with MAP2K3 (MKK3) in rat cardiomyocytes and isolated hearts exposed to H2O2. This disulfide heterodimer was sensitive to reduction by mercaptoethanol and was enhanced by the thioredoxin-reductase inhibitor auranofin. We predicted that Cys-119 or Cys-162 of p38α, close to the known MKK3 docking domain, were relevant for these redox characteristics. The C119S mutation decreased whereas the C162S mutation increased the dimer formation, suggesting that these two Cys residues act as vicinal thiols, consistent with C119S/C162S being incapable of sensing H2O2. Similarly, disulfide heterodimer formation was abolished in H9C2 cells expressing both MKK3 and p38α C119S/C162S and subjected to simulated ischemia and reperfusion. However, the p38α C119S/C162S mutants did not exhibit appreciable alteration in activating dual phosphorylation. In contrast, the anti-inflammatory agent 10-nitro-oleic acid (NO2-OA), a component of the Mediterranean diet, reduced p38α activation and covalently modified Cys-119/Cys-162, probably obstructing MKK3 access. Moreover, NO2-OA reduced the dephosphorylation of p38α by hematopoietic tyrosine phosphatase (HePTP). Furthermore, steric obstruction of Cys-119/Cys-162 by NO2-OA pretreatment in Langendorff-perfused murine hearts prevented the p38-MKK3 disulfide dimer formation and attenuated H2O2-induced contractile dysfunction. Our findings suggest that cysteine residues within p38α act as redox sensors that can dynamically regulate the association between p38 and MKK3.
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Affiliation(s)
- Rekha Bassi
- From the King's College London British Heart Foundation Centre of Excellence, Department of Cardiology, The Rayne Institute, St. Thomas' Hospital, London SE1 7EH, United Kingdom
| | - Joseph R Burgoyne
- From the King's College London British Heart Foundation Centre of Excellence, Department of Cardiology, The Rayne Institute, St. Thomas' Hospital, London SE1 7EH, United Kingdom
| | - Gian F DeNicola
- From the King's College London British Heart Foundation Centre of Excellence, Department of Cardiology, The Rayne Institute, St. Thomas' Hospital, London SE1 7EH, United Kingdom
| | - Olena Rudyk
- From the King's College London British Heart Foundation Centre of Excellence, Department of Cardiology, The Rayne Institute, St. Thomas' Hospital, London SE1 7EH, United Kingdom
| | - Vittorio DeSantis
- From the King's College London British Heart Foundation Centre of Excellence, Department of Cardiology, The Rayne Institute, St. Thomas' Hospital, London SE1 7EH, United Kingdom
| | - Rebecca L Charles
- From the King's College London British Heart Foundation Centre of Excellence, Department of Cardiology, The Rayne Institute, St. Thomas' Hospital, London SE1 7EH, United Kingdom
| | - Philip Eaton
- From the King's College London British Heart Foundation Centre of Excellence, Department of Cardiology, The Rayne Institute, St. Thomas' Hospital, London SE1 7EH, United Kingdom
| | - Michael S Marber
- From the King's College London British Heart Foundation Centre of Excellence, Department of Cardiology, The Rayne Institute, St. Thomas' Hospital, London SE1 7EH, United Kingdom
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Sharikabad MN, Østbye KM, Brørs O. Effect of hydrogen peroxide on reoxygenation-induced Ca2+ accumulation in rat cardiomyocytes. Free Radic Biol Med 2004; 37:531-8. [PMID: 15256224 DOI: 10.1016/j.freeradbiomed.2004.05.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2003] [Revised: 04/14/2004] [Accepted: 05/07/2004] [Indexed: 11/17/2022]
Abstract
Reactive oxygen species (ROS) contribute to cell damage during reperfusion of the heart. ROS may exert their effects partly by interfering with Ca(2+) homeostasis of the myocardium. The purpose of this study was to investigate the effects of hydrogen peroxide (H(2)O(2)) on Ca(2+) accumulation during reoxygenation of isolated adult rat cardiomyocytes exposed to 1 h of hypoxia and to relate the effects to possible changes in release of lactate dehydrogenase (LDH), free intracellular Ca(2+) ([Ca(2+)](i)) and Mg(2+)([Mg(2+)](i)), and mitochondrial membrane potential (Deltapsim). Cell Ca(2+) was determined by (45)Ca(2+) uptake. Free [Mg(2+)](i) and [Ca(2+)](i) and Deltapsim were measured by flow cytometry. Reoxygenation-induced Ca(2+) accumulation was attenuated by 23 and 34% by 10 and 25 microM H(2)O(2), respectively, added at reoxygenation. H(2)O(2) at 100 and 250 microM increased cell Ca(2+) by 50 and 83%, respectively, whereas 500 microM H(2)O(2) decreased cell Ca(2+) by 20%. H(2)O(2) at (25 microM) reduced LDH release and [Mg(2+)](i) and increased Deltapsim, indicating cell protection, whereas 250 microM H(2)O(2) increased LDH release and [Mg(2+)](i) and decreased Deltapsim, indicating cell damage. Clonazepam (100 microM) attenuated the increase in Ca(2+) accumulation, the elevation of [Ca(2+)](i), and the decrease in Deltapsim induced by 100 and 250 microM H(2)O(2) during reoxygenation. We report for the first time that 25 microM H(2)O(2) attenuates Ca(2+) accumulation, LDH release, and dissipation of Deltapsim during reoxygenation of hypoxic cardiomyocytes, indicating cell protection.
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Affiliation(s)
- Mohammad Nouri Sharikabad
- Division of Clinical Pharmacology and Toxicology, Clinical Chemistry Department, Ullevaal University Hospital, Oslo, Norway.
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