title: Cyclodiene organochlorine insecticide-induced alterations in the sulfur-redox cycle in CHO-K1 cells.
abstract: The effect of the cyclodiene organochlorine pesticides aldrin, dieldrin and endosulfan was assessed on CHO-K1 cultures at fractions of their lethal doses, determined by the neutral red (NRI) incorporation assay (NRI6.25, NRI12.5 and NRI25). Glutathione peroxidase, reductase and S-transferase, and total and oxidised glutathione were evaluated along the standard growth curve of the cultures. After a 24-h incubation with each insecticide, glutathione peroxidase incurred a large increase, while glutathione reductase and S-transferase activities were slightly higher than untreated controls. Unlike oxidised glutathione, the content of total glutathione declined significantly after exposure to cyclodiene insecticides. Changes in cell membrane integrity were assessed by the lactate dehydrogenase (LDH) release assay and lipid peroxidation for a wide range of pesticide concentrations. Membrane leakage and peroxide production were significantly enhanced at concentrations of aldrin and as low as 12.5 microg/ml, whereas dieldrin and endosulfan increased membrane fragility at much higher concentrations.
authors.affiliation: Department of Plant Protection, Faculty of Agriculture, University Aim Shams, Cairo, Egypt.
authors.forename: A E
authors.initials: AE
authors.lastname: Bayoumi
authors.forename: A J
authors.initials: AJ
authors.lastname: García-Fernández
authors.forename: C
authors.initials: C
authors.lastname: Ordóñez
authors.forename: Y
authors.initials: Y
authors.lastname: Pérez-Pertejo
authors.forename: J C
authors.initials: JC
authors.lastname: Cubría
authors.forename: R M
authors.initials: RM
authors.lastname: Reguera
authors.forename: R
authors.initials: R
authors.lastname: Balaña-Fouce
authors.forename: D
authors.initials: D
authors.lastname: Ordóñez
mesh_terms: D000452:Aldrin / Q000494:pharmacology* / Q000633:toxicity; D000818:Animals; D016466:CHO Cells; D002462:Cell Membrane / Q000187:drug effects; D006224:Cricetinae; D004026:Dieldrin / Q000494:pharmacology* / Q000633:toxicity; D004305:Dose-Response Relationship, Drug; D004726:Endosulfan / Q000494:pharmacology* / Q000633:toxicity; D005978:Glutathione / Q000378:metabolism; D019803:Glutathione Disulfide / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D007306:Insecticides / Q000494:pharmacology* / Q000633:toxicity; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D010084:Oxidation-Reduction / Q000187:drug effects; D013455:Sulfur / Q000378:metabolism*; D013997:Time Factors
chemical_list: D007306:Insecticides; D013455:Sulfur; D007770:L-Lactate Dehydrogenase; D005979:Glutathione Peroxidase; D005980:Glutathione Reductase; D005982:Glutathione Transferase; D005978:Glutathione; D004026:Dieldrin; D004726:Endosulfan; D000452:Aldrin; D019803:Glutathione Disulfide