New Insights Into the Role and Mechanism of Glycogen Synthase Activation by Insulin
Abstract
The metabolism of the storage polysaccharide glycogen is intimately linked with insulin action and blood glucose homeostasis. Insulin activates both glucose transport and glycogen synthase in skeletal muscle. The central issue of a long-standing debate is which of these two effects determines the rate of glycogen synthesis in response to insulin. Recent studies with transgenic animals indicate that, under appropriate conditions, each process can contribute to determining the extent of glycogen accumulation. Insulin causes stable activation of glycogen synthase by promoting dephosphorylation of multiple sites in the enzyme. A model linking this action to the mitogen-activated protein kinase signaling pathway via the phosphorylation of the regulatory subunit of glycogen synthase phosphatase gained widespread acceptance. However, the most recent evidence argues strongly against this mechanism. A newer model, in which insulin inactivates the enzyme glycogen synthase kinase-3 via the protein kinase B pathway, has emerged. Though promising, this model still does not completely explain the molecular basis for the insulin-mediated activation of glycogen synthase, which remains one of the many unknowns of insulin action.
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GSK-3 phosphorylates Ser645, Ser649, Ser653, Ser657 of glycogen synthase, which are the most important sites for regulation of glycogen synthase activity.
“GSK-3 phosphorylates these sites, which are the most important for regulation of glycogen synthase activity [11]”
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Maegawa, H., Hasegawa, M., Sugai, S., Obata, T., Ugi, S., Morino, K., Egawa, K., Fujita, T., Sakamoto, T., Nishio, Y., et al. (1999) · Journal of Biological Chemistry · doi:10.1074/jbc.274.42.30236 · Cited by 75 · see citing works
Dual Regulation of Glycogen Synthase Kinase-3β by the α1A-Adrenergic Receptor
Ballou, L. M., Tian, P.-Y., Lin, H., Jiang, Y., & Lin, R. Z. (2001) · Journal of Biological Chemistry · doi:10.1074/jbc.m103480200 · Cited by 72 · see citing works
Sabin, M. A., Stewart, C. E. H., Crowne, E. C., Turner, S. J., Hunt, L. P., Welsh, G. I., Grohmann, M. J., Holly, J. M. P., & Shield, J. P. H. (2007) · Journal of Cellular Physiology · doi:10.1002/jcp.20922 · Cited by 71 · see citing works
“Palmitate (C16:0; saturated FFA) has been shown to reduce insulin-stimulated phosphorylation of AKT (pAKT—a key signalling molecule in the pathway from insulin stimulation to glucose uptake (Lawrence and Roach, 1997; Bevan, 2001)) in murine C2C12 myotubes (Schmitz-Peiffer et al., 1999).”
BackgroundDrosophila melanogasteras a Model for Diabetes Type 2 Progression
Álvarez-Rendón, J. P., Salceda, R., & Riesgo‐Escovar, J. R. (2018) · BioMed Research International · doi:10.1155/2018/1417528 · Cited by 69 · see citing works
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Insulin‐like actions of vanadium: Potential as a therapeutic agent
Marzban, L., & McNeill, J. H. (2003) · The Journal of Trace Elements in Experimental Medicine · doi:10.1002/jtra.10034 · Cited by 63 · see citing works
“Activity of glycogen synthase, the key enzyme in glycogen synthesis, is regulated by both glycogen synthase kinase-3 (GSK-3), a downstream enzyme of PKB, which inactivates (phosphorylates) glycogen synthase and by protein phosphatase-1 (PP-1), which activates (dephosphorylates) the enzyme [69,70].”
BackgroundAntihyperglycemic and hypolipidemic effects of Costus speciosus in alloxan induced diabetic rats
Bavarva, J. H., & Narasimhacharya, A. V. R. L. (2008) · Phytotherapy Research · doi:10.1002/ptr.2302 · Cited by 66 · see citing works
“An increase in hepatic glycogen content in CSREt administered animals suggests the activation of glycogen synthase for which the substrate glucose-6phosphate could have been readily provided by an increased hexokinase activity (Lawrence and Roach, 1997; Bouche et al., 2004).”
BackgroundGlucose 6-Phosphate Regulates Hepatic Glycogenolysis Through Inactivation of Phosphorylase
Aiston, S., Andersen, B., & Agius, L. (2003) · Diabetes · doi:10.2337/diabetes.52.6.1333 · Cited by 67 · see citing works
“Glycogen synthase is regulated by multisite phosphorylation, which results in inactivation (2,3).”
BackgroundNikoulina, S. E., Ciaraldi, T. P., Carter, L., Mudaliar, S. R. D., Park, K. S., & Henry, R. R. (2001) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jcem.86.9.7872 · Cited by 65 · see citing works
“Evidence has accumulated to support a key role for PI 3-kinase in mediating insulin action on glucose transport and GS (44, 45).”
Control of Glycogen Synthesis in Cultured Human Muscle Cells
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Genetics of type 2 diabetes mellitus: status and perspectives
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“GSK3 is one of several kinases that phosphorylate glycogen synthase (GS), an event that helps to maintain the enzyme in an inactive state [16].”
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“In addition, the postprandial increase of insulin stimulates GS by reducing its phosphorylation and inactivation by GSK3, at least in muscle (12).”
BackgroundControl of Glycogen Synthesis by Glucose, Glycogen, and Insulin in Cultured Human Muscle Cells
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“in [1]).”
Azpiazu, I., Manchester, J., Skurat, A. V., Roach, P. J., & Lawrence, J. C. (2000) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.2000.278.2.e234 · Cited by 59 · see citing works
“Insulin activates both glucose transport and glycogen synthase in skeletal muscle, thereby affecting the initial as well as the final step in the pathway leading from extracellular glucose to glycogen (24).”
BackgroundSelf-citationRegulation of Glycogen Synthase in Rat Hepatocytes
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Signalling pathways involved in the stimulation of glycogen synthesis by insulin in rat hepatocytes
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“The activation of glycogen synthase by insulin results from dephosphorylation of sites (3a + 3b + 3c) and (2a + 2 b) [30].”
BackgroundKim, Y., Peroni, O. D., Aschenbach, W. G., Minokoshi, Y., Kotani, K., Zisman, A., Kahn, C. R., Goodyear, L. J., & Kahn, B. B. (2005) · Molecular and Cellular Biology · doi:10.1128/mcb.25.21.9713-9723.2005 · Cited by 57 · see citing works
“, glycogen synthase and phosphorylase, respectively (32, 44), we investigated the activities of these two enzymes in muscle of muscle-G4KO mice.”
BackgroundInfluential
- Authors
- Lawrence, J. C., & Roach, P. J.
- Affiliations
- University of Virginia (US)
- Indiana University Indianapolis (US)
- Venue
- Diabetes
- Publisher
- American Diabetes Association
- Published
- 1997-04-01
- Volume
- 46
- Issue
- 4
- Pages
- 541-547
- ISSN
- 0012-1797 (ISSN-L)
- 1939-327X
- OpenAlex
- W2140664543
- Cited by
- 311
- References
- 0
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 8 · 2023: 3 · 2022: 7 · 2021: 8 · 2020: 3 · 2019: 6 · 2018: 4 · 2017: 6 · 2016: 6 · 2015: 4 · 2014: 10 · 2013: 3 · 2012: 14
- FWCI
- 7.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Diabetes (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (1zicar041189-01)
- National Institute of Diabetes and Digestive and Kidney Diseases (DK28312, DK 27221, R01DK028312)
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR41189)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Health Sciences › Medicine › Rheumatology › Glycogen Storage Diseases and Myoclonus
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Keywords
- glycogen synthase, insulin signaling, glycogen synthesis, glycogen synthase kinase-3, Akt, mitogen-activated protein kinase, glycogen synthase phosphatase, glucose transport, skeletal muscle, blood glucose homeostasis
- MeSH terms
- Animals, Enzyme Activation, Glycogen, Glycogen Synthase, Humans, Insulin, Muscle, Skeletal
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