title: Multiple protective mechanisms of alpha-lipoic acid in oxidation, apoptosis and inflammation against hydrogen peroxide induced toxicity in human lymphocytes.
abstract: The naturally antioxidant and coenzyme, alpha-lipoic acid (α-LA), has gained considerable attention regarding different functions and therapeutically effective in treating oxidative stress-associated diseases in the human body. This study was designed to examine the protective effect of α-LA against H2O2-induced oxidative stress and apoptosis in human lymphoid cells. Human peripheral blood lymphocytes were preincubated with α-LA and then exposed to H2O2. After that, the viability of the cells, rate of apoptosis, oxidative stress biomarkers such as reactive oxygen species (ROS) and level of lipid peroxidation (LPO), and also tumor necrosis factor-α (TNF-α) were studied. Pretreatment of lymphocytes with α-LA, dramatically enhanced viability of the cells and decreased apoptosis. Investigation of caspases gives a clear picture of the mechanism by which α-LA decreases ROS and causes a reduction in apoptosis through caspase-9-dependent mitochondrial pathway. Furthermore, α-LA dose dependently decreased oxidative stress by a reduction in level of LPO, and the dose of 1000 µM indicates a significant decrease (p < 0.01) in TNF-α level. Collectively, the present data show that α-LA is an ideal compound which has profound protective effects on oxidation, inflammation, and apoptosis. As a result, α-LA may indicate a new way toward the development of antioxidant therapy.
authors: Toxicology and Poisoning Research Center, Department of Toxicology and Pharmacology, Faculty of Pharmacy and Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences, 1417614411, Tehran, Iran.
authors: Mahban
authors: M
authors: Rahimifard
authors: Mona
authors: M
authors: Navaei-Nigjeh
authors: Maryam
authors: M
authors: Baeeri
authors: Faheem
authors: F
authors: Maqbool
authors: Mohammad
authors: M
authors: Abdollahi
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D053148:Caspase 3 / Q000378:metabolism; D053453:Caspase 9 / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects; D005434:Flow Cytometry; D005453:Fluorescence; D006801:Humans; D006861:Hydrogen Peroxide / Q000633:toxicity*; D007249:Inflammation / Q000473:pathology*; D008214:Lymphocytes / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology*; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism; D010084:Oxidation-Reduction / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects; D020011:Protective Agents / Q000494:pharmacology*; D013194:Staining and Labeling; D008063:Thioctic Acid / Q000494:pharmacology*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D020011:Protective Agents; C439524:TNF protein, human; D014409:Tumor Necrosis Factor-alpha; D008063:Thioctic Acid; D006861:Hydrogen Peroxide; D053148:Caspase 3; D053453:Caspase 9