title: Hydroxytyrosol, the phenolic compound of olive oil protects human PBMC against oxidative stress and DNA damage mediated by 2,3,7,8-TCDD.
abstract: The protective effect of hydroxytyrosol (HT), a strong antioxidant compound from extra virgin olive oil, against TCDD induced toxicity was investigated in human peripheral blood mononuclear cells (PBMC). PBMC (1 × 10(6)cellsmL(-1)) were divided into four groups and were incubated in a CO(2) incubator (5% CO(2)) for 12h with vehicle, TCDD (10 nM), TCDD+HT (10 nM+100 μM) and HT alone (100 μM) respectively. To clarify the role of HT against TCDD induced cytotoxicity, oxidative stress and the levels of antioxidant enzymes were assessed. Incubation of PBMC with TCDD significantly decreased cell viability, catalase (CAT) and glutathione peroxidase (GPx) and increased the levels of superoxide dismutase (SOD), glutathione reductase (GR) and oxidative stress markers such as lipid peroxidation products (LPO), protein carbonyl content (PCC) and reactive oxygen species (ROS). Whereas, HT had an effective antioxidant property as observed by the increased cell viability, normalization of antioxidant enzymes and decreased levels of LPO, PCC and ROS in PBMC co-treated with HT and TCDD. Apoptosis detection and comet assay results shows that HT, by acting as an antioxidant, prevents the damage to DNA induced by TCDD. In addition light microscopic and histopathological observations revealed that the cells are apoptotic and degenerated during TCDD treatment, whereas cells showed intact morphology during co-treatment with HT. On the whole, the results reveal that HT exerts a promising antioxidant potential in protecting the PBMC against TCDD induced oxidative stress, which might be due to the presence of catechol moiety in its structure.
authors: Department of Biotechnology, Alagappa University, Karaikudi 630 003, Tamil Nadu, India.
authors: Kalaiselvan
authors: K
authors: Ilavarasi
authors: Perumal Vijayaraman
authors: PV
authors: Kiruthiga
authors: Shunmugiah Karutha
authors: SK
authors: Pandian
authors: Kasi Pandima
authors: KP
authors: Devi
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D002374:Catalase / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects; D004249:DNA Damage; D004785:Environmental Pollutants / Q000633:toxicity*; D005979:Glutathione Peroxidase / Q000378:metabolism; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000187:drug effects* / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D000069463:Olive Oil; D018384:Oxidative Stress / Q000187:drug effects*; D010626:Phenylethyl Alcohol / Q000031:analogs & derivatives* / Q000494:pharmacology; D010938:Plant Oils / Q000737:chemistry; D000072317:Polychlorinated Dibenzodioxins / Q000633:toxicity*; D017382:Reactive Oxygen Species / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D004785:Environmental Pollutants; D000069463:Olive Oil; D010938:Plant Oils; D000072317:Polychlorinated Dibenzodioxins; D017382:Reactive Oxygen Species; C005975:3,4-dihydroxyphenylethanol; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D010626:Phenylethyl Alcohol