Levocarnitine Protects H9c2 Rat Cardiomyocytes from H2O2-induced Mitochondrial Dysfunction and Apoptosis
| Autor: | Ning Kong, Chun-Yan Yang, Miao Liu, Cui-Ying Mao, Jia-Yu Li, Ping Yang, Hai-Bin Lu |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Cell Survival
Apoptosis Oxidative phosphorylation Mitochondrion medicine.disease_cause Cell Line Levocarnitine Lipid peroxidation chemistry.chemical_compound Carnitine medicine Animals Myocytes Cardiac biology Cytochrome c Hydrogen Peroxide General Medicine Mitochondria Rats Cell biology Oxidative Stress Ischemic heart disease chemistry biology.protein Mitochondrial dysfunction Oxidative stress Intracellular Research Paper |
| Zdroj: | International Journal of Medical Sciences |
| ISSN: | 1449-1907 |
| DOI: | 10.7150/ijms.9153 |
| Popis: | Background: Although the protective effects of levocarnitine in patients with ischemic heart disease are related to the attenuation of oxidative stress injury, the exact mechanisms involved have yet to be fully understood. Our aim was to investigate the potential protective effects of levocarnitine pretreatment against oxidative stress in rat H9c2 cardiomyocytes. Methods: Cardiomyocytes were exposed to H2O2 to create an oxidative stress model. The cells were pretreated with 50, 100, or 200 μM levocarnitine for 1 hour before H2O2 exposure. Results: H2O2 exposure led to significant activation of oxidative stress in the cells, characterized by reduced viability, increased intracellular reactive oxygen species, lipid peroxidation, and reduced intracellular antioxidant activity. Mitochondrial dysfunction was also observed following H2O2 exposure, reflected by the loss of mitochondrial transmembrane potential and intracellular adenosine triphosphate. These pathophysiological processes led to cardiomyocyte apoptosis through activation of the intrinsic apoptotic pathway. More importantly, the levocarnitine pretreatment attenuated the H2O2-induced oxidative injury significantly, preserved mitochondrial function, and partially prevented cardiomyocyte apoptosis during the oxidative stress reaction. Western blotting analyses suggested that levocarnitine pretreatment increased plasma protein levels of Bcl-2, reduced Bax, and attenuated cytochrome C leakage from the mitochondria in the cells. Conclusion: Our in vitro study indicated that levocarnitine pretreatment may protect cardiomyocytes from oxidative stress-related damage. |
| Databáze: | OpenAIRE |
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