title: Paraquat toxicity in a mouse embryonic stem cell model.
abstract: The objective of this in vitro study was to use a mouse embryonic stem (mES) cell model to better understand pesticide injury that may adversely affect early pregnancy and to evaluate an antioxidant intervention. Undifferentiated D3 mES cells were incubated 24h with control, reference dose (RfD), no observed effect level (NOEL), or lowest observed effect level (LOEL) of paraquat, a commonly used, toxic agricultural herbicide. Pesticide effects were evaluated at 0 and 24h using assays for cell proliferation, total reactive oxygen species (ROS), viability, and alkaline phosphatase activity. Compared to 0 h, cell proliferation increased significantly in the 24h control treatment and was stalled in all paraquat dilutions tested. ROS production and percent necrotic and apoptotic cells were significantly increased at all paraquat concentrations examined. Alkaline phosphatase activity suggested that cells remained undifferentiated during the study period. Experiments with ascorbic acid suggested that pesticide effects on cell viability and ROS production were minimized by the recommended daily allowance (RDA) of vitamin C. Data suggest pesticide-induced injury can occur very early in development and at concentrations predicted without health consequences. Mouse ES cells may provide a useful in vitro model for rapidly screening developmental toxicants and protective interventions.
authors: School of Nursing, Oregon Health and Science University, One University Boulevard, La Grande Campus, La Grande, OR 97850, USA.
authors: Venu
authors: V
authors: Perla
authors: Nancy A
authors: NA
authors: Perrin
authors: Anne R
authors: AR
authors: Greenlee
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D053595:Embryonic Stem Cells / Q000187:drug effects*; D016166:Free Radical Scavengers / Q000494:pharmacology; D005780:Gelatin / Q000737:chemistry; D006540:Herbicides / Q000037:antagonists & inhibitors / Q000633:toxicity*; D006801:Humans; D020287:In Situ Nick-End Labeling; D051379:Mice; D019055:No-Observed-Adverse-Effect Level; D018384:Oxidative Stress / Q000187:drug effects; D010269:Paraquat / Q000037:antagonists & inhibitors / Q000633:toxicity*; D017382:Reactive Oxygen Species / Q000378:metabolism; D012015:Reference Standards
chemical_list: D016166:Free Radical Scavengers; D006540:Herbicides; D017382:Reactive Oxygen Species; D005780:Gelatin; D000469:Alkaline Phosphatase; D010269:Paraquat; D001205:Ascorbic Acid