title: Beneficial effects of DL-alpha-lipoic acid on cyclophosphamide-induced oxidative stress in mitochondrial fractions of rat testis.
abstract: The present study investigated the protective efficacy of dl-alpha-lipoic acid on the peroxidative damage and abnormal antioxidant levels in the mitochondrial fraction of testis in cyclophosphamide (CP) administered rats. Male Wistar rats of 140+/-20 g were categorized into four groups. Two groups were administered CP (15 mg/kg body weight once a week for 10 weeks by oral gavage) to induce testicular toxicity; one of these groups received lipoic acid treatment (35 mg/kg body weight intraperitoneally once a week for 10 weeks, 24 h prior to CP administration). A vehicle-treated control group and a lipoic acid drug control group were also included. The mitochondrial fraction of untreated CP-exposed testis showed 1.84-fold increase in lipid peroxidation, along with a significant (P<0.001) increase in hydrogen peroxide levels. In CP-exposed rats, we observed abnormal changes in the activities/levels of mitochondrial enzymic (superoxide dismutase, glutathione peroxidase and glutathione reductase) and non-enzymic (reduced glutathione, ascorbate and alpha-tocopherol) antioxidants. CP-treated rats also showed decline in the activities of mitochondrial enzymes such as succinate dehydrogenase, malate dehydrogenase and isocitrate dehydrogenase. In contrast, rats pretreated with lipoic acid showed normal lipid peroxidation and antioxidant defenses, thereby showing the protection rendered by lipoic acid.
authors.affiliation: Department of Medical Biochemistry, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Taramani Campus, Chennai 600 113, India.
authors.forename: Elangovan
authors.initials: E
authors.lastname: Selvakumar
authors.forename: Chidambaram
authors.initials: C
authors.lastname: Prahalathan
authors.forename: Yenjerla
authors.initials: Y
authors.lastname: Mythili
authors.forename: Palaninathan
authors.initials: P
authors.lastname: Varalakshmi
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D001205:Ascorbic Acid / Q000378:metabolism; D003520:Cyclophosphamide / Q000494:pharmacology*; D006861:Hydrogen Peroxide / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D008928:Mitochondria / Q000378:metabolism*; D018384:Oxidative Stress / Q000187:drug effects*; D010088:Oxidoreductases / Q000187:drug effects / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013737:Testis / Q000378:metabolism*; D008063:Thioctic Acid / Q000494:pharmacology*; D024502:alpha-Tocopherol / Q000378:metabolism
chemical_list: D000975:Antioxidants; D008063:Thioctic Acid; D003520:Cyclophosphamide; D006861:Hydrogen Peroxide; D010088:Oxidoreductases; D024502:alpha-Tocopherol; D001205:Ascorbic Acid