Two experiments were carried out to examine the impacts of hydroxytyrosol (HT) on lipid metabolism and mitochondrial function in Megalobrama amblycephala. Triplicate groups of fish were fed four test diets: (1) low-fat diet (LFD, 5% fat), (2) high-fat diet (HFD, 15% fat), (3) LFD + 100 mg/kg HT (LFD + HT), and (4) HFD + 100 mg/kg HT (HFD + HT) (in vivo). Hepatocytes from the same batch were exposed to three media including L-15 medium (L15), oleic acid (OA) medium [L15 + 400 μM OA], and OA + HT medium [L15 + 400 μM OA + 10 μM HT] to explore the roles of HT in mitochondrial function (in vitro). Fish fed HFD had excessive fat deposition in the liver, and HT inclusion in the HFD decreased hepatic fat deposition. Transmission electron microscopy revealed that the HFD triggers loss of cristae and metrical density and hydropic changes in mitochondria and that HT supplementation attenuates the ultrastructural alterations of mitochondria. The in vitro test showed that HT decreases fat deposition in hepatocytes, suppresses the reactive oxygen species formation, and facilitates the expression of phospho-AMPK protein and the genes involved in mitochondria biogenesis (PGC-1, NRF-1, TFAM) and autophagy (PINK1, Mul1, Atg5). These findings suggest the lipid-lowering effect of HT mediated by activation of mitochondrial biogenesis and autophagy through the AMPK pathway.

• Klíčová slova
• blunt snout bream, fat deposition, hydroxytyrosol, mitochondrial biogenesis, mitophagy,
• MeSH
• autofagie * MeSH
• biogeneze organel MeSH
• Cyprinidae genetika   metabolismus   MeSH
• dietní tuky metabolismus   MeSH
• fenethylalkohol analogy a deriváty   metabolismus   MeSH
• hepatocyty metabolismus   MeSH
• játra cytologie   metabolismus   MeSH
• krmivo pro zvířata analýza   MeSH
• mitochondrie metabolismus   MeSH
• proteinkinasy aktivované AMP genetika   metabolismus   MeSH
• rybí proteiny genetika   metabolismus   MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• 3,4-dihydroxyphenylethanol MeSH Prohlížeč
• dietní tuky MeSH
• fenethylalkohol MeSH
• proteinkinasy aktivované AMP MeSH
• rybí proteiny MeSH