Mitogen-activated protein kinase kinase inhibition does not block the stimulation of glucose utilization by insulin

D. F. Lazar, R. J. Wiese, M. J. Brady, C. C. Mastick, S. B. Waters, K. Yamauchi, Jeffrey E. Pessin, P. Cuatrecasas, A. R. Saltiel

Research output: Contribution to journalArticle

322 Citations (Scopus)

Abstract

Insulin stimulates the activity of mitogen-activated protein kinase (MAPK) via its upstream activator, MAPK kinase (MEK), a dual specificity kinase that phosphorylates MAPK on threonine and tyrosine. The potential role of MAPK activation in insulin action was investigated with the specific MEK inhibitor PD98059. Insulin stimulation of MAPK activity in 3T3-L1 adipocytes (2.7- fold) and L6 myotubes (1.4-fold) was completely abolished by pretreatment of cells with the MEK inhibitor, as was the phosphorylation of MAPK and pp90(Rsk), and the transcriptional activation of c-fos. Insulin receptor autophosphorylation on tyrosine residues and activation of phosphatidylinositol 3'-kinase were unaffected. Pretreatment of cells with PD98059 had no effect on basal and insulin-stimulated glucose uptake, lipogenesis, and glycogen synthesis. Glycogen synthase activity in extracts from 3T3-L1 adipocytes and L6 myotubes was increased 3-fold and 1.7-fold, respectively, by insulin. Pretreatment with 10 μM PD98059 was without effect. Similarly, the 2-fold activation of protein phosphatase 1 by insulin was insensitive to PD98059. These results indicate that stimulation of the MAPK pathway by insulin is not required for many of the metabolic activities of the hormone in cultured fat and muscle cells.

Original languageEnglish (US)
Pages (from-to)20801-20807
Number of pages7
JournalJournal of Biological Chemistry
Volume270
Issue number35
DOIs
StatePublished - 1995
Externally publishedYes

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Mitogen-Activated Protein Kinase Kinases
Mitogen-Activated Protein Kinases
Insulin
Glucose
Chemical activation
Adipocytes
Skeletal Muscle Fibers
Cells
Tyrosine
90-kDa Ribosomal Protein S6 Kinases
Phosphatidylinositol 3-Kinase
Protein Phosphatase 1
Glycogen Synthase
Lipogenesis
Phosphorylation
Insulin Receptor
Threonine
Glycogen
Muscle Cells
Transcriptional Activation

ASJC Scopus subject areas

  • Biochemistry

Cite this

Lazar, D. F., Wiese, R. J., Brady, M. J., Mastick, C. C., Waters, S. B., Yamauchi, K., ... Saltiel, A. R. (1995). Mitogen-activated protein kinase kinase inhibition does not block the stimulation of glucose utilization by insulin. Journal of Biological Chemistry, 270(35), 20801-20807. https://doi.org/10.1074/jbc.270.35.20801

Mitogen-activated protein kinase kinase inhibition does not block the stimulation of glucose utilization by insulin. / Lazar, D. F.; Wiese, R. J.; Brady, M. J.; Mastick, C. C.; Waters, S. B.; Yamauchi, K.; Pessin, Jeffrey E.; Cuatrecasas, P.; Saltiel, A. R.

In: Journal of Biological Chemistry, Vol. 270, No. 35, 1995, p. 20801-20807.

Research output: Contribution to journalArticle

Lazar, DF, Wiese, RJ, Brady, MJ, Mastick, CC, Waters, SB, Yamauchi, K, Pessin, JE, Cuatrecasas, P & Saltiel, AR 1995, 'Mitogen-activated protein kinase kinase inhibition does not block the stimulation of glucose utilization by insulin', Journal of Biological Chemistry, vol. 270, no. 35, pp. 20801-20807. https://doi.org/10.1074/jbc.270.35.20801
Lazar, D. F. ; Wiese, R. J. ; Brady, M. J. ; Mastick, C. C. ; Waters, S. B. ; Yamauchi, K. ; Pessin, Jeffrey E. ; Cuatrecasas, P. ; Saltiel, A. R. / Mitogen-activated protein kinase kinase inhibition does not block the stimulation of glucose utilization by insulin. In: Journal of Biological Chemistry. 1995 ; Vol. 270, No. 35. pp. 20801-20807.
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