Cited by 399Metabolism, Diabetes, and CancerPI3K/AKT/mTOR signaling in cancerPancreatic function and diabetes

Increased insulin sensitivity and hypoglycaemia in mice lacking the p85α subunit of phosphoinositide 3–kinase

Terauchi, Yasuo, Tsuji, Youki, Satoh, Shinobu, Minoura, Hideaki, Murakami, Koji, Okuno, Akira, Inukai, Kouichi, Asano, Tomoichiro +22 more·1999·Nature Genetics

Abstract

The hallmark of type 2 diabetes, the most common metabolic disorder, is a defect in insulin-stimulated glucose transport in peripheral tissues. Although a role for phosphoinositide-3-kinase (PI3K) activity in insulin-stimulated glucose transport and glucose transporter isoform 4 (Glut4) translocation has been suggested in vitro, its role in vivo and the molecular link between activation of PI3K and translocation has not yet been elucidated. To determine the role of PI3K in glucose homeostasis, we generated mice with a targeted disruption of the gene encoding the p85alpha regulatory subunit of PI3K (Pik3r1; refs 3-5). Pik3r1-/- mice showed increased insulin sensitivity and hypoglycaemia due to increased glucose transport in skeletal muscle and adipocytes. Insulin-stimulated PI3K activity associated with insulin receptor substrates (IRSs) was mediated via full-length p85 alpha in wild-type mice, but via the p50 alpha alternative splicing isoform of the same gene in Pik3r1-/- mice. This isoform switch was associated with an increase in insulin-induced generation of phosphatidylinositol(3,4,5)triphosphate (PtdIns(3,4,5)P3) in Pik3r1-/- adipocytes and facilitation of Glut4 translocation from the low-density microsome (LDM) fraction to the plasma membrane (PM). This mechanism seems to be responsible for the phenotype of Pik3r1-/- mice, namely increased glucose transport and hypoglycaemia. Our work provides the first direct evidence that PI3K and its regulatory subunit have a role in glucose homeostasis in vivo.

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Crossref · 10.1038/6023

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Authors
Terauchi, Y., Tsuji, Y., Satoh, S., Minoura, H., Murakami, K., Okuno, A., Inukai, K., Asano, T., Kaburagi, Y., Ueki, K., Nakajima, H., Hanafusa, T., Matsuzawa, Y., Sekihara, H., Yin, Y., Barrett, J. C., Oda, H., Ishikawa, T., Akanuma, Y., Komuro, I., Suzuki, M., Yamamura, K.-I., Kodama, T., Suzuki, H., Koyasu, S., Aizawa, S., Tobe, K., Fukui, Y., Yazaki, Y., & Kadowaki, T.
Affiliations
  • Research Center for Advanced Science and Technology, The University of Tokyo (JP)
  • The University of Tokyo (JP)
  • Yokohama City University (JP)
  • The University of Osaka (JP)
  • National Institutes of Health (US)
  • Kumamoto University (JP)
  • Keio University (JP)
  • Institute of Molecular Embryology and Genetics, Kumamoto University (JP)
Corresponding author
Kadowaki, Takashi
Venue
Nature Genetics
Published
1999-02
Volume
21
Issue
2
Pages
230-235
ISSN
  • 1061-4036 (ISSN-L)
  • 1546-1718
OpenAlex
W1523062737
Cited by
399
References
28
Citations by year
2026: 1 · 2024: 9 · 2023: 4 · 2022: 5 · 2021: 10 · 2020: 7 · 2019: 8 · 2018: 8 · 2017: 11 · 2016: 9 · 2015: 5 · 2014: 8 · 2013: 8 · 2012: 17
FWCI
9.19
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Genetics (publishedVersion)
  • PubMed (publishedVersion)
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
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
Keywords
phosphatidylinositol 3-kinase, p85alpha regulatory subunit, PIK3R1, insulin sensitivity, hypoglycemia, glucose transport, GLUT4 translocation, glucose homeostasis, type 2 diabetes, insulin receptor substrate, phosphatidylinositol 3,4,5-trisphosphate, alternative splicing, skeletal muscle, adipocytes, low density microsomes
MeSH terms
Animals, Biological Transport, Crosses, Genetic, Deoxyglucose, Enzyme Activation, Glucose, Hypoglycemia, Insulin, Isoenzymes, Kinetics, Subcellular Fractions, Mice, Knockout, Muscle, Skeletal, Phosphatidylinositol 3-Kinases, Mice, Class Ia Phosphatidylinositol 3-Kinase

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