Ethanol impairs insulin-stimulated neuronal survival in the developing brain role of pten phosphatase

Julia Xu, Jong Eun Yeon, Howard Chang, Geoffrey Tison, Guo Jun Chen, Jack Wands, Suzanne De la Monte

Research output: Contribution to journalArticle

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Abstract

Gestational exposure to ethanol causes fetal alcohol syndrome, which is associated with cerebellar hypoplasia. Previous in vitro studies demonstrated ethanol-impaired neuronal survival with reduced signaling through the insulin receptor (IRβ). We examined insulin signaling in an experimental rat model of chronic gestational exposure to ethanol in which the pups exhibited striking cerebellar hypoplasia with increased apoptosis. Immunoprecipitation and Western blot analyses detected reduced levels of tyrosyl-phosphorylated IRβ, tyrosyl-phosphorylated insulin receptor substrate-1 (IRS-1), and p85-associated IRS-1 but no alterations in IRβ, IRS-1, or p85 protein expression in cerebellar tissue from ethanol-exposed pups. In addition, ethanol exposure significantly reduced the levels of total phosphoinositol 3-kinase, Akt kinase, phospho-BAD (inactive), and glyceraldehyde-3-phosphate dehydrogenase and increased the levels of glycogen synthase kinase-3 activity, activated BAD, phosphatase and tensin homolog deleted in chromosome 10 (PTEN) protein, and PTEN phosphatase activity in cerebellar tissue. Cerebellar neurons isolated from ethanol-exposed pups had reduced levels of insulin-stimulated phosphoinositol 3-kinase and Akt kinase activities and reduced insulin inhibition of PTEN and glycogen synthase kinase-3 activity. The results demonstrate that cerebellar hypoplasia produced by chronic gestational exposure to ethanol is associated with impaired survival signaling through insulin-regulated pathways, including failure to suppress PTEN function.

Original languageEnglish
Pages (from-to)26929-26937
Number of pages9
JournalJournal of Biological Chemistry
Volume278
Issue number29
DOIs
Publication statusPublished - 2003 Jul 18
Externally publishedYes

Fingerprint

Phosphoric Monoester Hydrolases
Brain
Ethanol
Insulin
Insulin Receptor Substrate Proteins
Insulin Receptor
Phosphotransferases
PTEN Phosphohydrolase
Glycogen Synthase Kinase 3
Tissue
Fetal Alcohol Spectrum Disorders
Chromosomes, Human, Pair 10
Glyceraldehyde-3-Phosphate Dehydrogenases
Chromosomes
Immunoprecipitation
Neurons
Rats
Theoretical Models
Western Blotting
Alcohols

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Ethanol impairs insulin-stimulated neuronal survival in the developing brain role of pten phosphatase. / Xu, Julia; Yeon, Jong Eun; Chang, Howard; Tison, Geoffrey; Chen, Guo Jun; Wands, Jack; De la Monte, Suzanne.

In: Journal of Biological Chemistry, Vol. 278, No. 29, 18.07.2003, p. 26929-26937.

Research output: Contribution to journalArticle

Xu, Julia ; Yeon, Jong Eun ; Chang, Howard ; Tison, Geoffrey ; Chen, Guo Jun ; Wands, Jack ; De la Monte, Suzanne. / Ethanol impairs insulin-stimulated neuronal survival in the developing brain role of pten phosphatase. In: Journal of Biological Chemistry. 2003 ; Vol. 278, No. 29. pp. 26929-26937.
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