Abstract
Considering the excessive lipid accumulation status caused by the increased dietary lipid intake in farmed fish, this study aimed to investigate the systemic effect of dietary lipid levels and α-lipoic acid supplementation on nutritional metabolism in zebrafish. A total of 540 male zebrafish (0.17 g) were fed with normal (CT) and high lipid level (HL) diets for 6 weeks, then fed on 1000 mg/kg α-lipoic acid supplementation diets for the second 6 weeks. HL diets did not affect whole fish protein content, but increased ASNS expression (P < 0.05). Dietary α-lipoic acid increased whole fish protein content, and decreased the expressions of protein catabolism-related genes in muscle of high lipid level groups (P < 0.05). Furthermore, HL diets increased the whole fish lipid content and the expressions of gluconeogenesis and lipogenesis-related genes (P < 0.05), and α-lipoic acid counteracted these effects and decreased the whole fish triglyceride and cholesterol contents and expressions of lipogenesis-related genes, with the enhanced expressions of lipolytic genes, especially in high lipid groups (P < 0.05). HL diets did not affect hepatocyte mitochondrial quantity or the mRNA expressions of mitochondrial biogenesis and electron transport chain-related genes; they were significantly increased by dietary α-lipoic acid (P < 0.05). These results indicated that high dietary lipid promotes lipid accumulation, while α-lipoic acid increases protein content in association of enhanced lipid catabolism. Thus, dietary α-lipoic acid supplementation could reduce lipid accumulation under high lipid, which provides a promising new approach in solving the problem of lipid accumulation in farmed fish.
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Abbreviations
- ACC:
-
acetyl-CoA carboxylase
- AMPK:
-
AMP-activated protein kinase
- APN:
-
aminopeptidase n
- ASNS:
-
asparagine synthetase
- ATGL:
-
adipose triglyceride lipase
- ATP5α1:
-
ATP synthase mitochondrial F1 complex alpha subunit.
- COX5ab:
-
cytochrome c oxidase subunit Vab
- CPT1:
-
carnitine palmitoyltransferase 1
- CT:
-
control
- DGAT2:
-
diacylglycerol acyltransferase 2
- FAS:
-
fatty acid synthase
- GDH1a:
-
glutamate dehydrogenase 1a
- GDH1b:
-
glutamate dehydrogenase 1b
- GK:
-
glucokinase
- G6Pase:
-
glucose-6-phosphatase
- HL:
-
high lipid
- HSL:
-
hormone-sensitive lipase
- LPL:
-
lipoprotein lipase
- mTOR:
-
mechanistic target of rapamycin
- NRF1:
-
nuclear respiratory factor 1
- PEPCK:
-
phosphoenolpyruvate carboxykinase
- PEPT1:
-
peptide transporter 1
- PFK:
-
Phosphofructokinase
- PGC-1α:
-
peroxisome proliferator-activated receptor gamma, coactivator 1 alpha
- PK:
-
pyruvate kinase
- SGLT-1:
-
sodium-dependent glucose co-transporter 1
- SIRT1:
-
sirtuin 1
- TFAM:
-
mitochondrial transcription factor A
- TEM:
-
transmission electron microscopy
- UQCRC2:
-
ubiquinol–cytochrome c reductase core protein II.
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Acknowledgments
Thanks are due to Jingjing Tian, Xiaochen Shi, and Bin-xin Zhang for their assistance in the study.
Funding
This work was financially supported by the project of Shaanxi Science and Technology innovation project plan (2015KTTSNY01-05), the Innovative Talent Promotion Program (2018TD-021), and the project of Shaanxi Science Key R & D plan (2018NY-024).
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All authors conceived and designed this experiment. Chen-cui Huang and Xing-da Xie performed the experiment and contributed to the analysis of data. Chen-cui Huang, Jian Sun, Hong Ji, Gen Kaneko, Xing-da Xie, Zhi-guang Chang, and Wei Deng co-wrote the manuscript. All authors read and approved this manuscript.
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Huang, Cc., Sun, J., Ji, H. et al. Systemic effect of dietary lipid levels and α-lipoic acid supplementation on nutritional metabolism in zebrafish (Danio rerio): focusing on the transcriptional level. Fish Physiol Biochem 46, 1631–1644 (2020). https://doi.org/10.1007/s10695-020-00795-8
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DOI: https://doi.org/10.1007/s10695-020-00795-8