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A novel IRS-1-associated protein, DGKζ regulates GLUT4 translocation in 3T3-L1 adipocytes

Insulin receptor substrates (IRSs) are major targets of insulin receptor tyrosine kinases. Here we identified diacylglycerol kinase zeta (DGKζ) as an IRS-1-associated protein, and examined roles of DGKζ in glucose transporter 4 (GLUT4) translocation to the plasma membrane. When DGKζ was knocked-down...

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Autores principales: Liu, TingYu, Yu, BuChin, Kakino, Mamoru, Fujimoto, Hitoshi, Ando, Yasutoshi, Hakuno, Fumihiko, Takahashi, Shin-Ichiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5064357/
https://www.ncbi.nlm.nih.gov/pubmed/27739494
http://dx.doi.org/10.1038/srep35438
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author Liu, TingYu
Yu, BuChin
Kakino, Mamoru
Fujimoto, Hitoshi
Ando, Yasutoshi
Hakuno, Fumihiko
Takahashi, Shin-Ichiro
author_facet Liu, TingYu
Yu, BuChin
Kakino, Mamoru
Fujimoto, Hitoshi
Ando, Yasutoshi
Hakuno, Fumihiko
Takahashi, Shin-Ichiro
author_sort Liu, TingYu
collection PubMed
description Insulin receptor substrates (IRSs) are major targets of insulin receptor tyrosine kinases. Here we identified diacylglycerol kinase zeta (DGKζ) as an IRS-1-associated protein, and examined roles of DGKζ in glucose transporter 4 (GLUT4) translocation to the plasma membrane. When DGKζ was knocked-down in 3T3-L1 adipocytes, insulin-induced GLUT4 translocation was inhibited without affecting other mediators of insulin-dependent signaling. Similarly, knockdown of phosphatidylinositol 4-phosphate 5-kinase 1α (PIP5K1α), which had been reported to interact with DGKζ, also inhibited insulin-induced GLUT4 translocation. Moreover, DGKζ interacted with IRS-1 without insulin stimulation, but insulin stimulation decreased this interaction. Over-expression of sDGKζ (short-form DGKζ), which competed out DGKζ from IRS-1, enhanced GLUT4 translocation without insulin stimulation. Taking these results together with the data showing that cellular PIP5K activity was correlated with GLUT4 translocation ability, we concluded that IRS-1-associated DGKζ prevents GLUT4 translocation in the absence of insulin and that the DGKζ dissociated from IRS-1 by insulin stimulation enhances GLUT4 translocation through PIP5K1α activity.
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spelling pubmed-50643572016-10-26 A novel IRS-1-associated protein, DGKζ regulates GLUT4 translocation in 3T3-L1 adipocytes Liu, TingYu Yu, BuChin Kakino, Mamoru Fujimoto, Hitoshi Ando, Yasutoshi Hakuno, Fumihiko Takahashi, Shin-Ichiro Sci Rep Article Insulin receptor substrates (IRSs) are major targets of insulin receptor tyrosine kinases. Here we identified diacylglycerol kinase zeta (DGKζ) as an IRS-1-associated protein, and examined roles of DGKζ in glucose transporter 4 (GLUT4) translocation to the plasma membrane. When DGKζ was knocked-down in 3T3-L1 adipocytes, insulin-induced GLUT4 translocation was inhibited without affecting other mediators of insulin-dependent signaling. Similarly, knockdown of phosphatidylinositol 4-phosphate 5-kinase 1α (PIP5K1α), which had been reported to interact with DGKζ, also inhibited insulin-induced GLUT4 translocation. Moreover, DGKζ interacted with IRS-1 without insulin stimulation, but insulin stimulation decreased this interaction. Over-expression of sDGKζ (short-form DGKζ), which competed out DGKζ from IRS-1, enhanced GLUT4 translocation without insulin stimulation. Taking these results together with the data showing that cellular PIP5K activity was correlated with GLUT4 translocation ability, we concluded that IRS-1-associated DGKζ prevents GLUT4 translocation in the absence of insulin and that the DGKζ dissociated from IRS-1 by insulin stimulation enhances GLUT4 translocation through PIP5K1α activity. Nature Publishing Group 2016-10-14 /pmc/articles/PMC5064357/ /pubmed/27739494 http://dx.doi.org/10.1038/srep35438 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Liu, TingYu
Yu, BuChin
Kakino, Mamoru
Fujimoto, Hitoshi
Ando, Yasutoshi
Hakuno, Fumihiko
Takahashi, Shin-Ichiro
A novel IRS-1-associated protein, DGKζ regulates GLUT4 translocation in 3T3-L1 adipocytes
title A novel IRS-1-associated protein, DGKζ regulates GLUT4 translocation in 3T3-L1 adipocytes
title_full A novel IRS-1-associated protein, DGKζ regulates GLUT4 translocation in 3T3-L1 adipocytes
title_fullStr A novel IRS-1-associated protein, DGKζ regulates GLUT4 translocation in 3T3-L1 adipocytes
title_full_unstemmed A novel IRS-1-associated protein, DGKζ regulates GLUT4 translocation in 3T3-L1 adipocytes
title_short A novel IRS-1-associated protein, DGKζ regulates GLUT4 translocation in 3T3-L1 adipocytes
title_sort novel irs-1-associated protein, dgkζ regulates glut4 translocation in 3t3-l1 adipocytes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5064357/
https://www.ncbi.nlm.nih.gov/pubmed/27739494
http://dx.doi.org/10.1038/srep35438
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