Inhibited Lipophagy Suppresses Lipid Metabolism in Zebrafish Liver Cells

Frontiers in Physiology

卷:10

Samwel Mchele Limbu¹  Dong-Liang Li²  Ling-Yu Li²  Mei-Ling Zhang²  Si-Lan Han²  Zhen-Yu Du²  Jing Wang²  Dong-Liang Lu² 

[1] Department of Aquatic Sciences and Fisheries Technology, University of Dar es Salaam, Dar es Salaam, Tanzania;

[2] Laboratory of Aquaculture Nutrition and Environmental Health, School of Life Sciences, East China Normal University, Shanghai, China;

关键词: zebrafish liver cells;    lipophagy;    lipid metabolism;    fatty acid β-oxidation;    esterification;   

DOI  :  10.3389/fphys.2019.01077

来源: DOAJ

【 摘 要 】

Lipophagy degrades lipid droplets (LDs) through the lysosomal degradative pathway, thus plays important roles in regulating lipid metabolism in mammals. However, information on the existence and functions of lipophagy in fish lipid metabolism is still limited. In the present study, we confirmed the existence of lipophagy by observing the structures of LDs sequestered in autophagic vacuoles in the zebrafish liver cell line (ZFL) via electronic microscopy. Moreover, starved cells increased the mRNA expression of the microtubule-associated protein 1A/1B light chain 3 beta (LC3), which is a marker protein for autophagy and protein conversion from LC3-I to LC3-II. Inhibiting autophagy with chloroquine increased significantly the LDs content and decreased fatty acid β-oxidation and esterification activities in the ZFL cells cultured in the fed state. Furthermore, inhibiting autophagy function downregulated the mRNA expression of the genes and their proteins related to lipid metabolism. Altogether, the present study verified the existence of lipophagy and its essential regulatory roles in lipid metabolism in fish cells.

【 授权许可】

Unknown