Cited by 51Metabolism, Diabetes, and CancerAdipokines, Inflammation, and Metabolic DiseasesGrowth Hormone and Insulin-like Growth Factors

Ahsg-fetuin blocks the metabolic arm of insulin action through its interaction with the 95-kD β-subunit of the insulin receptor

Goustin, Anton Scott, Derar, Nada, Abou-Samra, Abdul B.·2013·Cellular Signalling

Abstract

We previously have shown that Ahsg, a liver glycoprotein, inhibits insulin receptor (InsR) tyrosine kinase (TK) activity and the ERK1/2 mitogenic signaling arm of insulin signaling. Here we show that Ahsg blocks insulin-stimulated GLUT4 translocation and Akt activation in intact cells (mouse myoblasts). Furthermore, Ahsg inhibits InsR autophosphorylation of highly-purified insulin holoreceptors in a cell-free, ATP-dependent system, with an IC50 within the range of single-chain Ahsg concentrations in human serum. Binding of (125)I-insulin to living cells overexpressing the InsR shows a dissociation constant (KD) of 250pM, unaltered in the presence of 300 nM Ahsg. A mutant InsR cDNA encoding the signal peptide, the β-subunit and the furin processing site, but deleting the α-subunit, was stably expressed in HEK293 cells. Treatment with peroxovanadate, but not insulin, dramatically increased the 95 kD β-subunit tyrosine phosphoryation. The level of tyrosine phosphorylation of the 95-kD β-subunit can be driven down sharply by treatment of living HEK293 transfectant cells with physiological doses of Ahsg. Treatment of myogenic cells with Ahsg blunts insulin-stimulated InsR autophosphorylation and AKT phosphorylation. Taken together, we show that Ahsg antagonizes the metabolic functions initiated by InsR activation without interference in insulin binding. The experiments suggest a direct interaction of Ahsg with the InsR ectodomain β-subunit in a mode that does not significantly alter the high-affinity binding of insulin to the holoreceptor's two complementing α-subunits.

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Crossref · 10.1016/j.cellsig.2012.12.011

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Authors
Goustin, A. S., Derar, N., & Abou-Samra, A. B.
Affiliations
Wayne State University (US)
Corresponding author
Goustin, Anton Scott
Venue
Cellular Signalling
Publisher
Elsevier BV
Published
2013-04
Volume
25
Issue
4
Pages
981-988
ISSN
0898-6568 (ISSN-L)
OpenAlex
W2045965212
Cited by
51
References
44
Citations by year
2025: 2 · 2024: 7 · 2023: 5 · 2022: 5 · 2021: 4 · 2020: 7 · 2019: 3 · 2018: 2 · 2017: 7 · 2016: 3 · 2015: 1 · 2014: 5
FWCI
1.34
Type
journal article
Language
en
Open access
closed
Locations
  • Cellular Signalling (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5T32DK080657-02, DK062286-06)
  • King Abdullah's International Scholarship Program (Saudi Arabia)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
Keywords
fetuin-A, insulin receptor, insulin receptor beta-subunit, insulin receptor tyrosine kinase, insulin signaling, GLUT4 translocation, Akt phosphorylation, insulin receptor autophosphorylation, insulin binding, ERK signaling, insulin resistance, myoblasts
MeSH terms
Adenosine Triphosphate, Animals, Cell Line, Cell-Free System, Humans, Insulin, Kinetics, Mutation, Phosphorylation, Protein Binding, Receptor, Insulin, Transfection, Signal Transduction, Protein Subunits, Proto-Oncogene Proteins c-akt, Glucose Transporter Type 4, Mice, Rats, HEK293 Cells, alpha-2-HS-Glycoprotein

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