Cited by 71Metabolism, Diabetes, and CancerPI3K/AKT/mTOR signaling in cancerIon Transport and Channel Regulation

SGK1 Kinase Upregulates GLUT1 Activity and Plasma Membrane Expression

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Palmada, Monica, Boehmer, Christoph, Akel, Ahmad, Rajamanickam, Jeyaganesh, Jeyaraj, Sankarganesh, Keller, Konrad, Lang, Florian·2006·Diabetes

Abstract

Phosphatidylinositol 3-kinase (PI3 kinase) inhibition disrupts the ability of insulin to stimulate GLUT1 and GLUT4 translocation into the cell membrane and thus glucose transport. The effect on GLUT4 but not on GLUT1 is mediated by activation of protein kinase B (PKB). The serum- and glucocorticoid-inducible kinase SGK1, a further kinase downstream of PI3 kinase, regulates several transporters by enhancing their plasma membrane abundance. GLUT1 contains a consensus site (95Ser) for phosphorylation by SGK1. Thus, the present study investigated whether GLUT1 is regulated by the kinase. Tracer-flux studies in Xenopus oocytes and HEK-293 cells demonstrated that GLUT1 transport is enhanced by constitutively active S422DSGK1. The effect requires the kinase catalytical activity since the inactive mutant K127NSGK1 failed to modulate GLUT1. GLUT1 stimulation by S422DSGK1 is not due to de novo protein synthesis but rather to an increase of the transporter’s abundance in the plasma membrane. Kinetic analysis revealed that SGK1 enhances maximal transport rate without altering GLUT1 substrate affinity. These observations suggest that SGK1 regulates GLUT1 and may contribute to or account for the PI3 kinase–dependent but PKB-independent stimulation of GLUT1 by insulin.

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Crossref · 10.2337/diabetes.55.02.06.db05-0720

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  • Cortisol regulates glucose uptake by antagonising insulin-mediated translocation of GLUTs in fat and muscle.

    “CORT regulates glucose uptake by antagonising the insulin-mediated translocation of GLUTs in fat and muscle ( 32-35 ),”

    From Dynamic modulation of glucose utilisation by glucocorticoid rhythms in health and disease (2020) · cites this paper as [33]

    The Introduction states that insulin stimulates glucose transport by moving GLUT1 and GLUT4 to the plasma membrane. Neither it nor the Discussion says that cortisol antagonises this process in fat or muscle; the paper instead examines SGK1 regulation of GLUT1. (LLM, conf=0.85)

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  • Insulin facilitates translocation of GLUT1, GLUT3 and GLUT4 from intracellular pools to the cell membrane to amplify glucose uptake in adipocytes and muscle cells, while GCs antagonize this process by translocating GLUTs from the cell membrane back to intracellular compartments.

    “In particular, insulin facilitates the translocation of GLUT1, GLUT3 and GLUT4 from intracellular pools to the cell membrane to amplify the glucose uptake in adipocytes and muscle cells, while GCs antagonize this process by translocating GLUTs from the cell membrane back to intracellular compartments (26, 27).”

    From The progression of secondary diabetes: A review of modeling studies (2022) · cites this paper as [27]

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Authors
Palmada, M., Boehmer, C., Akel, A., Rajamanickam, J., Jeyaraj, S., Keller, K., & Lang, F.
Affiliations
  • Institute of Physiology I, University of Tübingen, Tübingen, Germany
  • University of Tübingen (DE)
  • Institute of Pharmacology, University of Berlin, Berlin, Germany
Venue
Diabetes
Published
2006-02-01
Volume
55
Issue
2
Pages
421-427
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2169149643
Cited by
71
References
48
Citations by year
2026: 2 · 2024: 1 · 2022: 2 · 2021: 3 · 2020: 8 · 2019: 4 · 2018: 4 · 2017: 4 · 2016: 2 · 2015: 2 · 2014: 4 · 2013: 1 · 2012: 1
FWCI
4.05
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
  • UCLA - Biblioteca de Ciencias de la Salud (submittedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (QLGA-CT-2001-52014)
  • Damascus University
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
Keywords
SGK1, GLUT1, glucose transporters, PI3K signaling, Akt, insulin-stimulated glucose transport, plasma membrane expression, serine phosphorylation, substrate affinity
MeSH terms
Serum-Glucocorticoid Regulated Kinases, Animals, Cell Line, Cell Membrane, Deoxyglucose, Glucose, Humans, Insulin, Kinetics, Oocytes, Xenopus laevis, Signal Transduction, Up-Regulation, Gene Expression Regulation, Enzymologic, Protein Serine-Threonine Kinases, Gene Deletion, Adipocytes, Immediate-Early Proteins, Phosphatidylinositol 3-Kinases, Protein Transport, Glucose Transporter Type 1, Mice

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