1
|
Habener A, Chowdhury A, Echtermeyer F, Lichtinghagen R, Theilmeier G, Herzog C. MitoNEET Protects HL-1 Cardiomyocytes from Oxidative Stress Mediated Apoptosis in an In Vitro Model of Hypoxia and Reoxygenation. PLoS One 2016; 11:e0156054. [PMID: 27243905 PMCID: PMC4887087 DOI: 10.1371/journal.pone.0156054] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 05/09/2016] [Indexed: 12/03/2022] Open
Abstract
The iron-sulfur cluster containing protein mitoNEET is known to modulate the oxidative capacity of cardiac mitochondria but its function during myocardial reperfusion injury after transient ischemia is unknown. The purpose of this study was to analyze the impact of mitoNEET on oxidative stress induced cell death and its relation to the glutathione-redox system in cardiomyocytes in an in vitro model of hypoxia and reoxygenation (H/R). Our results show that siRNA knockdown (KD) of mitoNEET caused an 1.9-fold increase in H/R induced apoptosis compared to H/R control while overexpression of mitoNEET caused a 53% decrease in apoptosis. Necrosis was not affected. Apoptosis of both, mitoNEET-KD and control cells was diminished to comparable levels by using the antioxidants Tiron and glutathione compound glutathione reduced ethyl ester (GSH-MEE), indicating that mitoNEET-dependent apoptosis is mediated by oxidative stress. The interplay between mitoNEET and glutathione redox system was assessed by treating cardiomyocytes with 2-acetylamino-3-[4-(2-acetylamino-2-carboxyethylsulfanylthio-carbonylamino) phenylthiocarbamoylsulfanyl] propionic acid (2-AAPA), known to effectively inhibit glutathione reductase (GSR) and to decrease the GSH/GSSG ratio. Surprisingly, inhibition of GSR-activity to 20% by 2-AAPA decreased apoptosis of control and mitoNEET-KD cells to 23% and 25% respectively, while at the same time mitoNEET-protein was increased 4-fold. This effect on mitoNEET-protein was not accessible by mitoNEET-KD but was reversed by GSH-MEE. In conclusion we show that mitoNEET protects cardiomyocytes from oxidative stress-induced apoptosis during H/R. Inhibition of GSH-recycling, GSR-activity by 2-AAPA increased mitoNEET-protein, accompanied by reduced apoptosis. Addition of GSH reversed these effects suggesting that mitoNEET can in part compensate for imbalances in the antioxidative glutathione-system and therefore could serve as a potential therapeutic approach for the oxidatively stressed myocardium.
Collapse
Affiliation(s)
- Anika Habener
- Department of Anesthesiology and Intensive Care Medicine, Hannover Medical School, Hannover, Germany.,Department of Pediatric Pneumology, Allergology and Neonatology, Hannover Medical School, Hannover, Germany
| | - Arpita Chowdhury
- Department of Anesthesiology and Intensive Care Medicine, Hannover Medical School, Hannover, Germany.,Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Frank Echtermeyer
- Department of Anesthesiology and Intensive Care Medicine, Hannover Medical School, Hannover, Germany
| | - Ralf Lichtinghagen
- Institute for Clinical Chemistry, Hannover Medical School, Hannover, Germany
| | - Gregor Theilmeier
- Department of Anesthesiology and Intensive Care Medicine, Hannover Medical School, Hannover, Germany.,Department of Health Services Sciences, Faculty of Medicine and Health Sciences, University of Oldenburg, Oldenburg, Germany
| | - Christine Herzog
- Department of Anesthesiology and Intensive Care Medicine, Hannover Medical School, Hannover, Germany
| |
Collapse
|
2
|
Huang P, Chen C, Wang H, Li G, Jing H, Han Y, Liu N, Xiao Y, Yu Q, Liu Y, Wang P, Shi Z, Sun Z. Manganese effects in the liver following subacute or subchronic manganese chloride exposure in rats. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2011; 74:615-622. [PMID: 20813406 DOI: 10.1016/j.ecoenv.2010.08.011] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2010] [Revised: 08/06/2010] [Accepted: 08/11/2010] [Indexed: 05/29/2023]
Abstract
Manganese (Mn) toxicity is most often found in mining and welding industry workers. Accumulation of manganese in the brain can result in a syndrome similar to that of Parkinson's disease. Observations on former Mn-alloy workers suggested that residual effects could last for years after exposure. The objective of this study was to assess effects of Mn in the liver of rats following subacute or subchronic exposure and after recovery. Male Sprague-Dawley rats were exposed to manganese chloride (MnCl(2)) for 30 days, 90 days, or for 90 days followed by a 30-day post-exposure recovery period. Results showed that MnCl(2) exposure resulted in liver injury in rats and the extent of injury correlated positively with exposure time. The effect in mitochondria was stronger than in the membrane or nucleus. Most of the changes in these biomarkers recovered when manganese exposure ceased.
Collapse
Affiliation(s)
- Peili Huang
- Department of Toxicology and Sanitary Chemistry, School of Public Health and Family Medicine, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, PR China
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|