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Citations to this article

Reduced expression of the murine p85α subunit of phosphoinositide 3-kinase improves insulin signaling and ameliorates diabetes
Franck Mauvais-Jarvis, … , Lewis C. Cantley, C. Ronald Kahn
Franck Mauvais-Jarvis, … , Lewis C. Cantley, C. Ronald Kahn
Published January 1, 2002
Citation Information: J Clin Invest. 2002;109(1):141-149. https://doi.org/10.1172/JCI13305.
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Reduced expression of the murine p85α subunit of phosphoinositide 3-kinase improves insulin signaling and ameliorates diabetes

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Abstract

A critical component of insulin action is the enzyme phosphoinositide (PI) 3-kinase. The major regulatory subunits of PI 3-kinase, p85α and its splice variants, are encoded by the Pik3r1 gene. Heterozygous disruption of Pik3r1 improves insulin signaling and glucose homeostasis in normal mice and mice made insulin-resistant by heterozygous deletion of the Insulin receptor and/or insulin receptor substrate-1 (IRS1) genes. Reduced expression of p85 modulates the molecular balance between this protein, the p110 catalytic subunit of PI 3-kinase, and the IRS proteins. Thus, despite the decrease in p85α, PI 3-kinase activation is normal, insulin-stimulated Akt activity is increased, and glucose tolerance and insulin sensitivity are improved. Furthermore, Pik3r1 heterozygosity protects mice with genetic insulin resistance from developing diabetes. These data suggest that regulation of p85α levels may provide a novel therapeutic target for the treatment of type 2 diabetes.

Authors

Franck Mauvais-Jarvis, Kohjiro Ueki, David A. Fruman, Michael F. Hirshman, Kei Sakamoto, Laurie J. Goodyear, Matteo Iannacone, Domenico Accili, Lewis C. Cantley, C. Ronald Kahn

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Topographical expression of class IA and class II phosphoinositide 3-kinase enzymes in normal human tissues is consistent with a role in differentiation
SS el Sheikh, J Domin, P Tomtitchong, P Abel, G Stamp, EN Lalani
BMC clinical pathology 2003
Hyperinsulinemia, glucose intolerance, and dyslipidemia induced by acute inhibition of phosphoinositide 3-kinase signaling in the liver
Kazuaki Miyake, Wataru Ogawa, Michihiro Mastumoto, Takehiro Nakamura, Hiroshi Sakaue, Masato Kasuga
Journal of Clinical Investigation 2002
Tissue-Specific Targeting of the Insulin Receptor Gene
RN Kulkarni, T Okada
Endocrine 2002
Characterization of the Met326Ile variant of phosphatidylinositol 3-kinase p85alpha
K Almind, L Delahaye, T Hansen, EV Obberghen, O Pedersen, CR Kahn
Proceedings of the National Academy of Sciences 2002
Molecular balance between the regulatory and catalytic subunits of phosphoinositide 3-kinase regulates cell signaling and survival
K Ueki, DA Fruman, SM Brachmann, YH Tseng, LC Cantley, CR Kahn
Molecular and cellular biology 2002
Altered Signaling and Cell Cycle Regulation in Embryonal Stem Cells with a Disruption of the Gene for Phosphoinositide 3-Kinase Regulatory Subunit p85α*
D Hallmann, K Trümper, H Trusheim, K Ueki, CR Kahn, LC Cantley, DA Fruman, D Hörsch
The Journal of biological chemistry 2002
Increased insulin sensitivity in mice lacking p85β subunit of phosphoinositide 3-kinase
Ueki K, Yballe CM, Brachmann SM, Vicent D, Watt JM, Kahn CR, Cantley LC
Proceedings of the National Academy of Sciences 2001

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