Ganglioside GM3 prevents high fat diet-induced hepatosteatosis via attenuated insulin signaling pathway

被引:2
作者
Tajima, Orie [1 ]
Fujita, Yuki [1 ,2 ]
Ohmi, Yuhsuke [3 ]
Furukawa, Koichi [1 ]
Furukawa, Keiko [1 ]
机构
[1] Chubu Univ, Coll Life & Hlth Sci, Dept Biomed Sci, Kasugai, Japan
[2] Aichi Med Univ Hosp, Dept Clin Lab, Nagakute, Japan
[3] Chubu Univ, Coll Life & Hlth Sci, Dept Clin Engn, Kasugai, Japan
来源
PLOS ONE | 2023年 / 18卷 / 02期
基金
日本科学技术振兴机构;
关键词
MALIGNANT PROPERTIES; HEPATIC STEATOSIS; MELANOMA-CELLS; LIPID RAFTS; SENSITIVITY; MICE; EXPRESSION; MAINTENANCE; INHIBITION; METABOLISM;
D O I
10.1371/journal.pone.0281414
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Gangliosides, sialic acid-containing glycosphingolipids, are widely involved in regulations of signal transductions to control cellular functions. It has been suggested that GM3, the simplest structure among gangliosides, is involved in insulin resistance, whereas it remains unclear whether insulin signaling diminished by GM3 actually aggravates the pathological conditions in metabolic disorders. Moreover, the functional roles of gangliosides in the regulation of insulin signaling have not yet been fully elucidated in liver or hepatocytes despite that it is one of the major insulin-sensitive organs. To understand physiological roles of GM3 in metabolic homeostasis in liver, we conducted a high fat diet (HFD) loading experiment using double knockout (DKO) mice of GM2/GD2 synthase and GD3 synthase, which lack all gangliosides except GM3, as well as wild-type (WT) mice. DKO mice were strikingly resistant to HFD-induced hepatosteatosis, and hepatic lipogenesis-related molecules including insulin signaling components were down-regulated in HFD-fed DKO. Furthermore, we established primary hepatocyte cultures from DKO and WT mice, and examined their responses to insulin in vitro. Following insulin stimulation, DKO hepatocytes expressing GM3 showed attenuated expression and/or activations in the downstream components compared with WT hepatocytes expressing GM2. While insulin stimulation induced lipogenic proteins in hepatocytes from both genotypes, their expression levels were lower in DKO than in WT hepatocytes after insulin treatment. All our findings suggest that the modified gangliosides, i.e., a shift to GM3 from GM2, might exert a suppressive effect on lipogenesis by attenuating insulin signaling at least in mouse hepatocytes, which might result in protection of HFD-induced hepatosteatosis.
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页数:20
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