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1 Medicine, University of Chicago, Chicago, IL, USA
* To whom correspondence should be addressed. E-mail: mbrady{at}medicine.bsd.uchicago.edu.
Glycogen is the storage form of carbohydrate for virtually every organism from yeast to primates. Most mammalian tissues store glucose as glycogen with the major depots located in muscle and liver. The French physiologist Claude Bernard first identified a starch-like substance in liver and muscle and coined the term "glycogen" or "sugar former" in the 1850s. During the 150 years since its identification, researchers in the field of glycogen metabolism have made numerous discoveries that are now recognized as significant milestones in biochemistry and cell signaling. Even so, more questions remain, and studies continue to demonstrate the complexity of the regulation of glycogen metabolism. Under classical definitions, the functions of glycogen seem clear: muscle glycogen is degraded to generate ATP during increased energy demand, whereas hepatic glycogen is broken down for release of glucose to the bloodstream to supply other tissues. However, recent findings demonstrate that the roles of glycogen in energy sensing, integration of metabolic pathways, and coordination of cellular responses to hormonal stimuli are far more complex.
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