Regulation of triglyceride metabolism in medaka (Oryzias latipes) hepatocytes by Neu3a sialidase

  • Kazuki Oishi
  • Mina Miyazaki
  • Ryo Takase
  • Petros Kingstone Chigwechokha
  • Masaharu Komatsu
  • Kazuhiro ShiozakiEmail author


Fish store triglycerides (TGs) in the liver, muscle, and adipose tissue and TGs constitute an energy source upon metabolic demand. The liver generally plays important roles in lipid metabolism. Recent studies have suggested the possibility of hepatic lipid metabolic regulation by ganglioside in mammals; however, ganglioside-mediated regulation of lipid metabolism is unclear in fish. This study aimed to clarify the role of ganglioside in fish TG metabolism, with particular reference to Neu3a, a ganglioside-specific sialidase expressed in the fish liver. Under fasting conditions, there was a decrease in hepatic TG contents, and neu3a mRNA level was significantly up-regulated in the medaka liver. To determine the role of Neu3a in hepatic lipid metabolism, Neu3a stable transfectants were generated using fish liver Hepa-T1 cells. After treating Neu3a cells with oleic acid, reduction of TG was detected in comparison with the mock cells. Furthermore, lipase activity was greater in Neu3a cells than in mock cells. To examine which ganglioside regulates these events, alterations of ganglioside composition in Neu3a cells were analyzed. Neu3a cells exhibited increased level of lactosylceramide (LacCer), a Neu3 enzymatic product originating from GM3. In addition, exposure of LacCer toward Hepa-T1 cells resulted in an increase of neutral lipase activity. The present results suggest that Neu3a up-regulation in medaka under fasting condition accelerates hepatic TG degradation for energy production via GM3 desialylation.


Fish Ganglioside Hepatocyte Lipid metabolism Sialidase Neu3 Triglyceride 





free fatty acid




N-acetylneuraminic acid




4- methylumbelliferyl palmitate



We appreciate technical assistances of Shoji Kodama, Asami Ikeda, Wataru Nishimura, and Oki Hayasaka and useful discussions of Prof. Yoshio Kaminishi and Dr. Kiyotaka Fujita.

Funding information

This work was supported by JSPS KAKENHI Grant Number 17J06604.


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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Kazuki Oishi
    • 1
    • 2
  • Mina Miyazaki
    • 1
  • Ryo Takase
    • 1
  • Petros Kingstone Chigwechokha
    • 3
  • Masaharu Komatsu
    • 1
    • 2
  • Kazuhiro Shiozaki
    • 1
    • 2
    Email author
  1. 1.Faculty of FisheriesKagoshima UniversityKagoshimaJapan
  2. 2.The United Graduate School of Agricultural SciencesKagoshima UniversityKagoshimaJapan
  3. 3.Department of Biological SciencesMalawi University of Science and TechnologyThyoloMalawi

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