Unknown,Transcriptomics,Genomics,Proteomics

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Systems Toxicology Identifies Mechanistic Impacts of 2-amino-4,6-dinitrotoluene (2-ADNT) Exposure in Northern Bobwhite

ABSTRACT: A systems toxicology investigation comparing and integrating transcriptomic and proteomic results was conducted to pursue a holistic understanding of the effects of the explosives degradation product 2-amino-4,6-dinitrotoluene (2A-DNT) dosing on the health of the wildlife bird model, Northern bobwhite (Colinus virginianus). A subchronic 60d toxicology bioassay was leveraged where both sexes were dosed via daily gavage with 0, 3, 14, or 30 mg/kg-d 2-ADNT. Effects on global transcript expression were investigated in liver and kidney tissue using custom microarrays for C. virginianus in both sexes at all doses, while effects on the proteome expression were investigated in liver for both sexes and kidney in males, all at the 30 mg/kg-d dose. As expected, transcript expression was not directly indicative of protein expression in response to 2A-DNT. However, a high degree of correspondence was observed among platforms when investigating higher-order functional responses including statistically enriched gene networks and canonical pathways, especially when connected to toxicological outcomes of 2A-DNT exposure. Specifically, comparison of gene networks statistically enriched from differentially expressed transcripts and for proteins showed common responses including inhibition of programmed cell death and arrest of cell cycle in liver tissues at 2A-DNT doses that caused liver necrosis and death in females. Additionally, both transcript and protein expression in liver tissue was indicative of induced phase I and II xenobiotic metabolism potentially as a mechanism to detoxify and excrete 2A-DNT. Nuclear signaling, transcript expression and protein expression assays each implicated PPAR nuclear signaling as a primary molecular target in the 2A-DNT exposure with significant downstream enrichment of PPAR-regulated pathways including various lipid metabolic pathways and gluconeogenesis suggesting impaired bioenergetic potential. Although the relative expression of transcripts and proteins within enriched pathways was at times divergent, transcript expression assays identified many critical metabolic pathways involved in 2A-DNT toxicity as well as impaired PPAR signaling, a key molecular initiating event known to be affected in di- and tri-nitrotoluene exposures. The animal exposure design is presented in a study by Quinn et al (2010). Five treatment groups consisting of 12 male and 12 female bobwhites each were administered 2A-DNT at 0, 0.5, 3, 14, or 30 mg/kg/day via oral gavage for 60 days. Controls received a volume of corn oil equivalent to the mean volume given to birds in the highest dose group without compound. Microarray hybridizations were conducted using completely randomized design experiments including a 2 x 4 factorial treatment arrangement to investigate the conditions: sex (male and female) and 2A-DNT dose (control, 3, 14, and 30 mg/kg-d) for both liver and kidney tissues. All conditions included 4 biological replicates. REFERENCE: Quinn Jr. MJ, McFarland CA, LaFiandra EM, Bazar MA, Johnson MS (2010) Acute, subacute, and subchronic exposure to 2A-DNT (2-amino-4,6-dinitrotoluene) in the northern bobwhite (Colinus virginianus) Ecotoxicology 19:945-952.

ORGANISM(S): Colinus virginianus

SUBMITTER: Kurt Gust

PROVIDER: E-GEOD-59910 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Munitions constituents (MCs) including hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), 2,4,6-trinitrotoluene (TNT), and TNT derivatives are recognized to elicit aberrant neuromuscular responses in many species. The onset of seizures resulting in death was observed in the avian model Northern bobwhite after oral dosing with RDX beginning at 8 mg/kg/day in subacute (14 days) exposures, whereas affective doses of the TNT derivative, 2,6-dinitrotoluene (2,6-DNT), caused gastrointestinal impacts, lethargy, and emaciation in subacute and subchronic (60 days) exposures. To assess and contrast the potential neurotoxicogenomic effects of these MCs, a Northern bobwhite microarray was developed consisting of 4119 complementary DNA (cDNA) features enriched for differentially-expressed brain transcripts from exposures to RDX and 2,6-DNT. RDX affected hundreds of genes in brain tissue, whereas 2,6-DNT affected few (M-bM-^IM-$ 17), indicating that 2,6-DNT exposure had relatively little impact on the brain in comparison to RDX. Birds exhibiting RDX-induced seizures accumulated over 20M-CM-^W more RDX in brain tissues in comparison to non-seizing birds even within a common dose. In parallel, expression patterns were unrelated among seizing and non-seizing birds exposed to equivalent RDX doses. In birds experiencing seizures, genes related to neuronal electrophysiology and signal transduction were significantly affected. Comparative toxicology revealed strong similarity in acute exposure effects between RDX and the organochlorine insecticide dichlorodiphenyltrichloroethane (DDT) regarding both molecular mechanisms and putative mode of action. In a manner similar to DDT, we hypothesize that RDX elicits seizures by inhibition of neuronal cell repolarization postaction potential leading to heightened neuronal excitability and seizures facilitated by multiple molecular mechanisms. Northern Bobwhite 14 Day RDX High Dose Exposure, Brain Tissue Investigation (High Laser Intensity Scan): Juvenile male and female Northern bobwhite (12 weeks of age) were dosed with RDX by daily gavage (0, 20, 80, 125, or 180 mg/kg/day). Each treatment group included seven birds (at least three of each sex per treatment). All RDX doses in the 14-day high-dose experiment elicited seizures within 3 days of experiment initiation (Johnson et al., 2007). Microarray experiments were conducted using a balanced interwoven-loop design using Cyanine-3 (Cy3) and A647. This experiment investigated the 14-day RDX high-dose exposure. All RDX-dosed quail accumulated ~20 mg/kg RDX in brain tissues (Johnson et al., 2007) and exhibited seizures. Transcript expression was compared among three male and three female controls versus three male and three female RDX-seized quail incorporating two dye swaps per biological replicate totaling 24 microarrays. Hybridizations included four technical replicates and two dye swaps per biological replicate resulting in a total of 24 micorarrays assayed. To broaden signal detection, each microarray was scanned at high and low laser power to resolve low-intensity spots and reduce signal saturation, respectively (Skibbe et al., 2006). This dataset represents the High Intensity Scan.

Dataset Information

Systems Toxicology Identifies Mechanistic Impacts of 2-amino-4,6-dinitrotoluene (2-ADNT) Exposure in Northern Bobwhite

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