Constitutive activation of protein kinase B alpha by membrane targeting promotes glucose and system A amino acid transport, protein synthesis, and inactivation of glycogen synthase kinase 3 in L6 muscle cells.
Abstract
Phosphatidylinositol 3-kinase (PI 3-kinase) has been implicated in the regulation of numerous cellular processes, including the insulin-induced regulation of glycogen synthase kinase 3 (GSK-3) and glucose transport. The hormonal-induced inactivation of GSK-3 is mediated by protein kinase B (PKB), a downstream target of PI 3-kinase, whose involvement in other insulin-stimulated responses remains poorly defined at present. In this study, we investigated whether the uptake of glucose, system A amino acid transport, and cellular protein synthesis are regulated by PKBalpha in L6 skeletal muscle cells. L6 cells stably overexpressing wild-type PKBalpha (wtPKBalpha) or a constitutively active membrane-targeted PKBalpha (mPKBalpha) showed a 3- and 15-fold increase in PKB activity, respectively. Both wtPKBalpha and mPKBalpha expression led to a significant increase in the basal uptake of glucose and methyl-aminoisobutyric acid (a substrate for the system A amino acid transporter), at least to a level seen in control cells treated with insulin. The stimulation in glucose transport was facilitated, in part, by the increased translocation of GLUT4 to the plasma membrane and also through an increase in the cellular synthesis of GLUT3. In the absence of insulin, only muscle cells expressing the constitutively active PKBalpha showed a significant increase in protein synthesis and an inhibition in GSK-3. Our results indicate that constitutive activation of PKBalpha in skeletal muscle stimulates the uptake of glucose, system A amino acids, and protein synthesis and promotes the inactivation of GSK-3. These observations imply that PKBalpha may have a role in the insulin-regulated control of these processes in skeletal muscle.
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Akt is the key intermediate in the IGF-1 signaling pathway that modulates downstream targets known to regulate protein synthesis and degradation.
“Akt is the key intermediate in the IGF-1 signaling pathway that modulates downstream targets known to regulate protein synthesis and degradation 21.”
From Akt-dependent anabolic activity of natural and synthetic brassinosteroids in rat skeletal muscle cells (2011) · cites this paper as [21]
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“In the lower two panels, we asked whether the activation of Akt by insulin and IGF-1 results in the phosphorylation of GSK-3, one of the targets of activated Akt (14, 33).”
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“For example, in vitro experiments revealed that Akt could stimulate expression of GLUT1 (65, 66) and GLUT3 (67).”
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Hajduch, É., Rencurel, F., Balendran, A., Batty, I. H., Downes, C. P., & Hundal, H. S. (1999) · Journal of Biological Chemistry · doi:10.1074/jbc.274.19.13563 · Cited by 127 · see citing works
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“Transport activities were determined as described previously (11, 31).”
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“Akt is one downstream target of PDK, and this serine/threonine kinase appear to be critical in the regulation of glucose transport (20, 33, 67), although a limited number of studies do not support this concept (32).”
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“Ser-473 is one of the major phosphorylation sites of Akt (32), which has been linked to glucose transport, based on findings that overexpression of constitutively active Akt leads to enhanced glucose transport in 3T3-l1 adipocyte and L6 myotubes (33,34).”
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“GSK-3b regulates a variety of elements involved in cellular metabolism, including glycogen synthase [43, 44].”
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“Since this pathway plays a critical role in protein synthesis ( Hajduch et al. 1998; Kimball et al. 1999), these data suggest that calpainmediated inhibition of the Akt signalling pathway may reduce skeletal muscle protein synthesis.”
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“Numerous proteins can dock on activated IRSs, and among them phosphoinositide-3-kinase (PI3K) and downstream effectors such as serine/threonine kinases protein kinase B (PKB, also known as Akt) and aPKC fk which play a crucial role in glucose homeostasis [9,10].”
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“Preparation of whole cell lysates - Adipocytes were lysed as described previously (23), Whole”
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“Cells were lysed after experimental manipulation (see figure legends) in an appropriate volume of lysis buffer (27).”
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Self-citationSphingolipids in Obesity, Type 2 Diabetes, and Metabolic Disease
Russo, S. B., Ross, J. S., & Cowart, L. A. (2013) · Handbook of experimental pharmacology · doi:10.1007/978-3-7091-1511-4_19 · Cited by 111 · see citing works
“Akt/PKB promotes the uptake of glucose in skeletal muscle by stimulating translocation of Glucose Transporter 4 (GluT4) resulting in an increase in the rate of glucose flux into the tissue, creating a state of decreased circulating glucose and stimulating the its conversion to energy storage molecules such as glycogen…”
BackgroundPirola, L., Bonnafous, S., Johnston, A., Chaussade, C., Portis, F., & OBBERGHEN, E. V. (2003) · Journal of Biological Chemistry · doi:10.1074/jbc.m208984200 · Cited by 108 · see citing works
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Carcinoembryonic Antigen-Related Cell Adhesion Molecule 1
DeAngelis, A. M., Heinrich, G., Dai, T., Bowman, T. A., Patel, P. R., Lee, S. J., Hong, E., Jung, D. Y., Aßmann, A., Kulkarni, R. N., et al. (2008) · Diabetes · doi:10.2337/db08-0379 · Cited by 105 · see citing works
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“Although an essential role for PKB in the insulin-stimulated translocation of GLUT4 has recently become controversial (30, 35), stable or inducible expression of a constitutively active membrane-bound form of PKB results in increased glucose transport activity and the persistent plasma membrane localization of GLUT4 (…”
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GLUT4 – At the Cross Roads Between Membrane Trafficking and Signal Transduction
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Akt Is a Molecular Target for Signal Transduction Therapy in Brain Ischemic Insult
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Muscle glycogen content affects insulin-stimulated glucose transport and protein kinase B activity
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“The majority of recent papers support the notion of a functional link between PKB activation and glucose transport stimulation in muscle (15, 23, 25, 26, 42), whereas others do not (27, 39).”
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“Transverse sections from ca-Akt-1, ca-Akt-2, and control muscles were also immunostained for slow myosin heavy chain to determine whether Akt overexpression resulted in altered muscle fiber type distribu216 Mol Endocrinol, January 2007, 21(1):215–228 Cleasby et al.”
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Self-citation
- Authors
- Hajduch, E., Alessi, D. R., Hemmings, B. A., & Hundal, H. S.
- Affiliations
- Department of Anatomy and Physiology, University of Dundee, Scotland, UK.
- University of Dundee (GB)
- Venue
- Diabetes
- Publisher
- American Diabetes Association
- Published
- 1998-07-01
- Volume
- 47
- Issue
- 7
- Pages
- 1006-1013
- ISSN
- 0012-1797 (ISSN-L)
- 1939-327X
- OpenAlex
- W1972307668
- Cited by
- 335
- References
- 0
- Citations by year
- 2025: 1 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 7 · 2020: 3 · 2019: 5 · 2018: 8 · 2017: 3 · 2016: 12 · 2015: 10 · 2014: 7 · 2013: 7 · 2012: 8
- FWCI
- 10.23
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Diabetes (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Wellcome Trust
- 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 › Cell Biology › Muscle metabolism and nutrition
- Keywords
- constitutive activation, phosphatidylinositol 3-kinase, glycogen synthase kinase-3, glucose transport, system A amino acid transport, protein synthesis, GLUT4 translocation, GLUT3, skeletal muscle, insulin signaling, L6 myoblasts
- MeSH terms
- Amino Acids, Animals, Biological Transport, Cell Differentiation, Cell Division, Cell Line, Cell Membrane, Enzyme Activation, Glucose, Humans, Muscle Proteins, Proto-Oncogene Proteins, Transfection, Gene Expression, Protein Serine-Threonine Kinases, Calcium-Calmodulin-Dependent Protein Kinases, Gene Targeting, Muscle, Skeletal, Glycogen Synthase Kinases, Glycogen Synthase Kinase 3, Proto-Oncogene Proteins c-akt, Rats
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