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Modulation of the Expression of Components of the Stress Response by Dietary Arachidonic Acid in European Sea Bass (Dicentrarchus labrax) Larvae

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Lipids

Abstract

This study reports for the first time on European sea bass, Dicentrarchus labrax (L.), larvae, the effect of different levels of dietary arachidonic acid (ARA; 20:4n-6) on the expression of genes related to the fish stress response. Copies of mRNA from genes related to steroidogenesis [StAR (steroidogenic acute regulatory protein), c-Fos, and CYP11β (11β-hydroxylase gene)], glucocorticoid receptor complex [GR (glucocorticoid receptor) and HSP (heat shock proteins) 70 and 90) and antioxidative stress (catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase] were quantified. Eighteen day-old larvae were fed for 14 days with three experimental diets with increasing levels of ARA (0.3, 0.6 and 1.2 % d.w.) and similar levels of docosahexaenoic (22:6n-3) and eicosapentaenoic (20:5n-3) acids (5 and 3 %, respectively). The quantification of stress-related genes transcripts was conducted by One-Step TaqMan real time RT-PCR with the standard curve method (absolute quantification). Increase dietary levels of ARA induced a significantly (p < 0.05) down-regulation of genes related to cortisol synthesis, such as StAR and CYP11β and up-regulated genes related to glucocorticoid receptor complex, such as HSP70 and GR. No effects were observed on antioxidant enzymes gene expression. These results revealed the regulatory role of dietary ARA on the expression of stress-related genes in European sea bass larvae.

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Abbreviations

ACTH:

Adrenocorticotropic hormone

ARA:

Arachidonic acid (204n-6)

CAT:

Catalase

COX:

Cyclooxygenase

CYP11β:

Cytochrome 11β-hydroxylase

DHA:

Docosahexaenoic acid (226n-3)

EPA:

Eicosapentaenoic acid (205n-3)

GH:

Growth hormone

GLC:

Gas liquid chromatography

GPX:

Glutathione peroxidase

GR:

Glucocorticoid receptor

HSP:

Heat shock protein

HPI:

Hypothalamic-pituitary-interrenal

IGF:

Insulin growth factor

LC-PUFA:

Long chain polyunsaturated fatty acid(s)

MW:

Molecular weight

PIn:

Peroxidation index

PGE:

Prostaglandin E

RT-PCR:

Real time polymerase chain reaction

SGR:

Specific growth rate

SOD:

Superoxide dismutase

StAR:

Steroidogenic acute regulatory protein

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Acknowledgments

This work has been partly funded under the EU seventh Framework Programme by the ARRAINA project N288925: Advanced Research Initiatives for Nutrition & Aquaculture.

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Montero, D., Terova, G., Rimoldi, S. et al. Modulation of the Expression of Components of the Stress Response by Dietary Arachidonic Acid in European Sea Bass (Dicentrarchus labrax) Larvae. Lipids 50, 1029–1041 (2015). https://doi.org/10.1007/s11745-015-4057-1

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