Unknown,Transcriptomics,Genomics,Proteomics

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Cod larvae oil exposure

ABSTRACT: This experiment was conducted in order to evaluate the potential contribution of oil droplets to the toxicity of dispersed oil to fish larvae. Atlantic cod larvae were exposed to five concentrations of either dispersed oil (D1-D5) (containing oil droplets [medium size 10-14 µm based on volume] and water soluble fraction [WSF]) or the filtered dispersion containing only WSF of oil (W1-W5) for four days and harvested for transcriptional analysis at 13 days post hatching. The most significant differently expressed genes were observed in cod larvae exposed to the highest concentration of the dispersed oil (containing 10.41 ± 0.46 µg ∑PAH/L), with CYP1A showing the strongest response. Functional analysis further showed that the top scored network as analyzed with Ingenuity Pathway Analysis was “Drug Metabolism, Endocrine System Development and Function, Lipid Metabolism”. Oil exposure also increased the expression of genes involved in bone resorption and decreased the expression of genes related to bone formation. In conclusion, oil exposure affects drug metabolism, endocrine regulation, cell differentiation and proliferation, apoptosis, fatty acid biosynthesis and tissue development in Atlantic cod larvae. The altered gene transcription was dominated by the WSF and the oil droplet fraction only had a moderate impact on the observed changes.

ORGANISM(S): Gadus morrhua

SUBMITTER: Rita Holdhus

PROVIDER: E-TABM-1136 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Understanding pathogen recognition and mechanisms in Atlantic cod are of significant importance for both basic research on wild populations and health management in aquaculture. A microarray approach was utilized to search for effects of viral (poly I:C/ polyinosinic acid:polycytidylic acid), bacterial (LPS/lipopolysaccharide) and polyclonal activator (PHA-L/phytohaemoagglutinin) stress in Atlantic cod head kidney cells. LPS cell activation increased mRNA expression of chemokine/Interleukin 8 (CXCL8/IL-8); interleukin -1? (IL-1?); cyclooxygenase 2 (COX2); leukocyte derived chemotaxin 2 (LECT2); LOC100698154, encoding a protein with unknown function; carboxyl-esterase 2 (CES2) and environmental biomarker cytochrome P450 1A (CYP1A). Mitogen activated protein kinase p38 (p38MAPK) and cathepsin F (CTSF) were downregulated by LPS. The antiviral responses induced by double stranded RNA (Poly I:C) clearly increased transcription of Toll like receptor 3 (TLR3) and interferon stimulating gene 15 (ISG15). The PHA response seemed to be more non-specific. Special for the PHA induction were the increase in Major histocompatibility complex class I (MHCI). CC chemokine type 2 (CK2) mRNA expression was increased by PHA, LPS and poly I:C, while p38MAPK and LECT2 was downregulated by PHA. Oxidative stress related genes like catalase and glutaredoxin (GLRX2) and the anti-apoptotic gene Bcl-2 showed no transcriptional changes compared to control in any of the treatments. Especially Poly I:C, but also LPS, induced leukotriene B4 (LTB4) and leukotriene B5 (LTB5) synthesis, while small amounts of prostaglandine E2 (PGE2) seemed to be constitutively produced in untreated cells, a production that was slightly elevated when exposing cells for LPS. This study reveals distinct signatures of bacteria and virus transcriptional responses in cod head kidney cells. In addition, the novel finding that Cyp1a was upregulated during the antibacterial response indicates a connection between immunity and aryl hydrocarbon receptor (AhR) activation in Atlantic cod.

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Cod larvae oil exposure

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