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O-GlcNAc: A Bittersweet Switch in Liver.
Kaisi Zhang1, Ruonan Yin2, Xiaoyong Yang1
1Program in Integrative Cell Signaling and Neurobiology of Metabolism, Yale University School of Medicine , New Haven, CT , USA ; Section of Comparative Medicine, Yale University School of Medicine , New Haven, CT , USA ; Department of Cellular and Molecular Physiology, Yale University School of Medicine , New Haven, CT , USA.
Frontiers in Endocrinology
|January 8, 2015
Summary
O-linked β-N-acetylglucosamine (O-GlcNAc) modification acts as a nutrient sensor regulating liver metabolism. This review explores how O-GlcNAc influences liver functions and its role in diseases like insulin resistance and fatty liver disease.
Area of Science:
- Biochemistry
- Molecular Biology
- Hepatology
Background:
- The liver maintains nutrient homeostasis through distinct metabolic pathways regulated by hormones like insulin and glucagon.
- These pathways involve complex, coordinated signaling cascades crucial for energy supply to other tissues.
- O-linked β-N-acetylglucosamine (O-GlcNAc) modification emerges as a key nutrient-sensing mechanism influencing cellular processes.
Purpose of the Study:
- To elucidate the mechanistic insights into the spatiotemporal regulation of liver metabolism by O-GlcNAc modification.
- To discuss the pathophysiological implications of O-GlcNAc in liver-related diseases.
Main Methods:
- This review synthesizes existing literature on O-GlcNAc modification in liver metabolism.
- It focuses on mechanistic studies detailing the spatiotemporal control exerted by O-GlcNAc.
- Pathophysiological connections to liver diseases are analyzed based on current research.
Main Results:
- O-GlcNAc modification acts as a dynamic molecular switch, integrating nutrient signals into metabolic pathways.
- Specific spatiotemporal patterns of O-GlcNAcylation regulate key hepatic processes such as glucose and lipid metabolism.
- Dysregulation of O-GlcNAc modification is implicated in the development of insulin resistance, non-alcoholic fatty liver disease, and fibrosis.
Conclusions:
- O-GlcNAc modification is a critical regulator of liver metabolic adaptation and homeostasis.
- Understanding O-GlcNAc's role provides novel therapeutic targets for metabolic liver diseases.
- Further research into O-GlcNAc signaling is essential for advancing hepatology and metabolic disease treatment.
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