title: Ascorbic acid and alpha-tocopherol as potent modulators of apoptosis on arsenic induced toxicity in rats.
abstract: Apoptosis or programmed cell death (PCD) is a genetically regulated cellular, physiological and biochemical suicidal mechanism that plays a crucial role in the development and defense of homeostasis, in which the cell participates in its own demise via a cascade of molecular interactions. PCD can be modulated by various stimuli including infectious agents or drugs. Arsenic is one among inducible toxic agent that triggers apoptosis via free radical generation. Since the generation of free radicals during the metabolism of arsenic is thought to be involved in arsenic toxicosis, understanding the deleterious effects caused by the ROS that attack the vital molecules like DNA has become important. The present work was conducted to evaluate the regulatory effect exerted by Vitamin C and Vitamin E upon the apoptotic process, which can be assessed by the presence of cells with apoptosis associated DNA breaks and characterize the role of TNF-alpha and caspase-3 in rats intoxicated with arsenic. Male albino rats of wistar strain (120-150 g) were used in this study and are further divided into seven groups. We observed that ascorbate and alpha-tocopherol selectively altered the extent of DNA damage by reducing TNF-alpha level and inhibiting the activation of caspase cascade, from these observations it is strongly believed that the present vitamins supplementation perspective, though observed in animal model, will have sustainable curative value among the already afflicted populations, neutralizing impact on freshly emerging arsenicosis scenario and possible proactive protection to those potentially susceptible to arsenicals exposure.
authors.affiliation: Department of Medical Biochemistry, Dr. AL. Mudaliar Post Graduate Institute of Basic Medical Sciences, University of Madras, Taramani Campus, Chennai 600 113, India.
authors.forename: Kadirvel
authors.initials: K
authors.lastname: Ramanathan
authors.forename: Muthuswamy
authors.initials: M
authors.lastname: Anusuyadevi
authors.forename: Samuel
authors.initials: S
authors.lastname: Shila
authors.forename: Chinnakannu
authors.initials: C
authors.lastname: Panneerselvam
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D018053:Arsenites / Q000633:toxicity*; D001205:Ascorbic Acid / Q000494:pharmacology*; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism; D004249:DNA Damage; D004785:Environmental Pollutants / Q000633:toxicity*; D020287:In Situ Nick-End Labeling; D007668:Kidney / Q000378:metabolism; D007962:Leukocytes / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D017670:Sodium Compounds / Q000633:toxicity*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D024502:alpha-Tocopherol / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D018053:Arsenites; D004785:Environmental Pollutants; D017670:Sodium Compounds; D014409:Tumor Necrosis Factor-alpha; C017947:sodium arsenite; C505410:Casp3 protein, rat; D053148:Caspase 3; D020169:Caspases; D024502:alpha-Tocopherol; D001205:Ascorbic Acid