Osmotic shock stimulates GLUT4 translocation in 3T3L1 adipocytes by a novel tyrosine kinase pathway

Dong Chen, Jeffrey Elmendorf, Ann Louise Olson, Xiong Li, H. Shelton Earp, Jeffrey E. Pessin

Research output: Contribution to journalArticle

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Abstract

Similar to insulin, osmotic shock of 3T3L1 adipocytes stimulated an increase in glucose transport activity and translocation of GLUT4 protein from intracellularly localized vesicles to the plasma membrane. The docking/fusion of GLUT4 vesicles with the plasma membrane appeared to utilize a similar mechanism, since expression of a dominant interfering mutant of syntaxin-4 prevented both insulin- and osmotic shock-induced GLUT4 translocation. However, although the insulin stimulation of GLUT4 translocation and glucose transport activity was completely inhibited by wortmannin, activation by osmotic shock was wortmannin-insensitive. Furthermore, insulin stimulated the phosphorylation and activation of the Akt kinase, whereas osmotic shock was completely without effect. Surprisingly, treatment of cells with the tyrosine kinase inhibitor, genistein, or microinjection of phosphotyrosine antibody prevented both the insulin- and osmotic shock-stimulated translocation of GLUT4. In addition, osmotic shock induced the tyrosine phosphorylation of several discrete proteins including Cbl, p130(cas), and the recently identified soluble tyrosine kinase, calcium- dependent tyrosine kinase (CADTK). In contrast, insulin had no effect on CADTK but stimulated the tyrosine phosphorylation of Cbl and the tyrosine dephosphorylation of pp125(FAK) and p130(cas). These data demonstrate that the osmotic shock stimulation of GLUT4 translocation in adipocytes occurs through a novel tyrosine kinase pathway that is independent of both the phosphatidylinositol 3-kinase and the Akt kinase.

Original languageEnglish (US)
Pages (from-to)27401-27410
Number of pages10
JournalJournal of Biological Chemistry
Volume272
Issue number43
DOIs
StatePublished - 1997
Externally publishedYes

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Osmotic Pressure
Adipocytes
Protein-Tyrosine Kinases
Insulin Coma
Insulin
Phosphorylation
Tyrosine
Cell membranes
Phosphotransferases
Chemical activation
Glucose Transporter Type 4
Cell Membrane
Phosphatidylinositol 3-Kinase
Qa-SNARE Proteins
Calcium
Glucose
Phosphotyrosine
Genistein
Microinjections
Fusion reactions

ASJC Scopus subject areas

  • Biochemistry

Cite this

Osmotic shock stimulates GLUT4 translocation in 3T3L1 adipocytes by a novel tyrosine kinase pathway. / Chen, Dong; Elmendorf, Jeffrey; Olson, Ann Louise; Li, Xiong; Earp, H. Shelton; Pessin, Jeffrey E.

In: Journal of Biological Chemistry, Vol. 272, No. 43, 1997, p. 27401-27410.

Research output: Contribution to journalArticle

Chen, Dong ; Elmendorf, Jeffrey ; Olson, Ann Louise ; Li, Xiong ; Earp, H. Shelton ; Pessin, Jeffrey E. / Osmotic shock stimulates GLUT4 translocation in 3T3L1 adipocytes by a novel tyrosine kinase pathway. In: Journal of Biological Chemistry. 1997 ; Vol. 272, No. 43. pp. 27401-27410.
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