Cited by 161Metabolism, Diabetes, and CancerAdipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and Metabolism

Adipose-specific Expression, Phosphorylation of Ser794 in Insulin Receptor Substrate-1, and Activation in Diabetic Animals of Salt-inducible Kinase-2

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Horike, Nanao, Takemori, Hiroshi, Katoh, Yoshiko, Doi, Junko, Min, Li, Asano, Tomoichiro, Sun, Xiao Jian, Yamamoto, Hiroyasu +4 more·2003·Journal of Biological Chemistry

Abstract

Salt-inducible kinase (SIK), first cloned from the adrenal glands of rats fed a high salt diet, is a serine/threonine protein kinase belonging to an AMP-activated protein kinase family. Induced in Y1 cells at an early stage of ACTH stimulation, it regulated the initial steps of steroidogenesis. Here we report the identification of its isoform SIK2. When a green fluorescent protein-fused SIK2 was expressed in 3T3-L1 preadipocytes, it was mostly present in the cytoplasm. When coexpressed in cAMP-responsive element-reporter assay systems, SIK2 could repress the cAMP-responsive element-dependent transcription, although the degree of repression seemed weaker than that by SIK1. SIK2 was specifically expressed in adipose tissues. When 3T3-L1 cells were treated with the adipose differentiation mixture, SIK2 mRNA was induced within 1 h, the time of induction almost coinciding with that of c/EBPbeta mRNA. Coexpressed with human insulin receptor substrate-1 (IRS-1) in COS cells, SIK2 could phosphorylate Ser(794) of human IRS-1. Adenovirus-mediated overexpression of SIK2 in adipocytes elevated the level of phosphorylation at Ser(789), the mouse equivalent of human Ser(794). Moreover, the activity and content of SIK2 were elevated in white adipose tissues of db/db diabetic mice. These results suggest that highly expressed SIK2 in insulin-stimulated adipocytes phosphorylates Ser(794) of IRS-1 and, as a result, might modulate the efficiency of insulin signal transduction, eventually causing the insulin resistance in diabetic animals.

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  • IRS1 S789 phosphorylation is negatively associated with insulin signaling.

    “Alternative studies show that IRS1 S789 phosphorylation is negatively associated with insulin signaling [146-149].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [148]

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Research works printed but not linked: 2

  1. Eldar-Finkelman, H., and Krebs, E. G. (1997) Proc. Natl. Acad. Sci. U. S. A. 94, 9660 -9664
  2. Ozes, O. N., Akca, H., Mayo, L. D., Gustin, J. A., Maehama, T., Dixon, J. E., and Donner, D. B. (2001) Proc. Natl. Acad. Sci. U. S. A. 98, 4640 -4645

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Authors
Horike, N., Takemori, H., Katoh, Y., Doi, J., Min, L., Asano, T., Sun, X. J., Yamamoto, H., Kasayama, S., Muraoka, M., Nonaka, Y., & Okamoto, M.
Affiliations
  • The University of Osaka (JP)
  • Senri Kinran University (JP)
  • The University of Tokyo (JP)
  • University of Vermont (US)
  • Koshien University (JP)
Corresponding author
Okamoto, Mitsuhiro
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2003-05
Volume
278
Issue
20
Pages
18440-18447
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2168780144
Cited by
161
References
48
Citations by year
2026: 4 · 2025: 7 · 2024: 7 · 2023: 11 · 2022: 4 · 2021: 11 · 2020: 5 · 2019: 4 · 2018: 7 · 2017: 1 · 2016: 4 · 2015: 7 · 2014: 9 · 2013: 8 · 2012: 12
FWCI
2.41
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Dartmouth College
  • Uehara Memorial Foundation (CREST)
  • Salt Science Research Foundation
  • Japan Society for the Promotion of Science (CREST)
  • Core Research for Evolutional Science and Technology
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 › Physiology › Adipose Tissue and Metabolism
Keywords
SIK2, IRS-1, adipose tissue, adipogenesis, C/EBPβ, insulin resistance, type 2 diabetes, db/db mice, insulin signaling
MeSH terms
Cyclic AMP, Adipose Tissue, Amino Acid Sequence, Animals, Cell Differentiation, Cell Line, Cloning, Molecular, Escherichia coli, Humans, Insulin Resistance, Male, Mice, Inbred C57BL, Molecular Sequence Data, Phosphoproteins, Phosphorylation, Plasmids, Precipitin Tests, RNA, Messenger, Serine, Tissue Distribution, Blotting, Northern, 3T3 Cells, Protein Serine-Threonine Kinases, Sequence Homology, Amino Acid, Protein Structure, Tertiary, Adipocytes, DNA, Complementary, COS Cells, Protein Isoforms, Mice, Insulin Receptor Substrate Proteins

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