MiR-205 Mediated Cu-Induced Lipid Accumulation in Yellow Catfish Pelteobagrus fulvidraco
- Int J Mol Sci. 2018 Sep 29;19(10):2980. doi: 10.3390/ijms19102980.
- 1. Laboratory of Nutrition and Feed Formulation for Aquatic Economic Animals, Fishery College, Huazhong Agricultural University, Wuhan 430070, China. [email protected].
- 2. Laboratory of Nutrition and Feed Formulation for Aquatic Economic Animals, Fishery College, Huazhong Agricultural University, Wuhan 430070, China. [email protected].
- 3. Chongqing Key Laboratory of Animal Biology, School of Life Sciences, Chongqing Normal University, Chongqing 401331, China. [email protected].
- 4. Laboratory of Nutrition and Feed Formulation for Aquatic Economic Animals, Fishery College, Huazhong Agricultural University, Wuhan 430070, China. [email protected].
- 5. Laboratory of Nutrition and Feed Formulation for Aquatic Economic Animals, Fishery College, Huazhong Agricultural University, Wuhan 430070, China. [email protected].
- 6. Laboratory of Nutrition and Feed Formulation for Aquatic Economic Animals, Fishery College, Huazhong Agricultural University, Wuhan 430070, China. [email protected].
- 7. Laboratory of Nutrition and Feed Formulation for Aquatic Economic Animals, Fishery College, Huazhong Agricultural University, Wuhan 430070, China. [email protected].
- 8. Laboratory of Nutrition and Feed Formulation for Aquatic Economic Animals, Fishery College, Huazhong Agricultural University, Wuhan 430070, China. [email protected].
- 9. Collaborative Innovation Center for Efficient and Health Production of Fisheries in Hunan Province, Changde 415000, China. [email protected].
The present working hypothesis is that the Cu-induced changes in lipid metabolism may be mediated by miRNAs. Here, we describe the miRNA profile of the liver tissues of yellow catfish exposed to waterborne Cu, based on larger-scale Sequencing of small RNA libraries. We identified a total of 172 distinct miRNAs. Among these miRNAs, compared to the control, mRNA expression levels of 16 miRNAs (miR-203a, 205, 1788-3p, 375, 31, 196a, 203b-3p, 2187-5p, 196d, 459-3p, 153a and miR-725, and two novel-miRNAs: chr4-1432, chr-7684) were down-regulated, and mRNA levels of miR-212 and chr20-5274 were up-regulated in Cu-exposed group. The functions of their target genes mainly involved ether lipid metabolism, glycerophospholipid metabolism, linoleic acid metabolism and α-linolenic acid metabolism. Cu exposure inhibited the expression of miR-205, whose predicted target genes were enriched in the pathway of lipid metabolism, including fas, lxrα, ddit3, lamp2, casp3a and baxa. These potential target genes were further verified by Dual-luciferase reporter gene assay. Using primary hepatocytes of yellow catfish, Cu incubation down-regulated miR-205 expression, and increased TG contents and FAS activity. LXR antagonist effectively ameliorate the Cu-induced change of TG content and FAS activity. These data suggest that down-regulation of the miRNA-205 may be an important step in Cu-induced changes in lipid metabolism in yellow catfish.