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Vol. 16, Issue 1, 348-357, January 2005

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The Major Target of the Endogenously Generated Reactive Oxygen Species in Response to Insulin Stimulation Is Phosphatase and Tensin Homolog and Not Phosphoinositide-3 Kinase (PI-3 Kinase) in the PI-3 Kinase/Akt Pathway

Ji Hae Seo ^*, Younghee Ahn , Seung-Rock Lee  , Chang Yeol Yeo ^*, and Kyu Chung Hur ^* 

^* Department of Biology, Ewha Women's University, Seoul 120-750, Korea; Center for Cell Signaling Research, Ewha Women's University, Seoul 120-750, Korea; and Department of Biochemistry, Chonbuk National University Medical School, Chonju 561-182, Korea

Submitted May 6, 2004; Revised October 22, 2004; Accepted October 27, 2004
Monitoring Editor: Carl-Henrik Heldin

Phosphoinositide-3 kinase (PI-3 kinase) and its downstream signaling molecules PDK-1 and Akt were analyzed in SK-N-SH and SK-N-BE(2) human neuroblastoma cell lines. When cells were stimulated with insulin, PI-3 kinase was activated in both cell lines, whereas the translocation of PDK-1 to the membrane fraction and phosphorylated Akt were observed only in SK-N-SH cells. Analyses of the insulin-mediated reactive oxygen species (ROS) generation and Phosphatase and Tensin homolog (PTEN) oxidation indicate that PTEN oxidation occurred in SK-N-SH cells, which can produce ROS, but not in SK-N-BE(2) cells, which cannot increase ROS in response to insulin stimulation. When SK-N-SH cells were pretreated with the NADPH oxidase inhibitor diphenyleneiodonium chloride before insulin stimulation, insulin-mediated translocation of PDK-1 to the membrane fraction and phosphorylation of Akt were remarkably reduced, whereas PI-3 kinase activity was not changed significantly. These results indicate that not only PI-3 kinase activation but also inhibition of PTEN by ROS is needed to increase cellular level of phosphatidylinositol 3,4,5-trisphosphate for recruiting downstream signaling molecules such as PDK-1 and Akt in insulin-mediated signaling. Moreover, the ROS generated by insulin stimulation mainly contributes to the inactivation of PTEN and not to the activation of PI-3 kinase in the PI-3 kinase/Akt pathway.

The online version of this article contains supplemental material at MBC Online (http://www.molbiolcell.org).

Corresponding author. E-mail address: hurkc{at}ewha.ac.kr.

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