Irs1 and Irs2 signaling is essential for hepatic glucose homeostasis and systemic growth

Xiaocheng Dong, Sunmin Park, Xueying Lin, Kyle Copps, Xianjin Yi, Morris F. White

Research output: Contribution to journalArticle

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Abstract

Insulin receptor substrates, including Irs1 and Irs2, integrate insulin and IGF receptor signals with heterologous pathways to coordinate growth and metabolism. Since Irs2 is thought to be especially important in hepatic nutrient homeostasis, we deleted Irs1 from hepatocytes of WT mice (called LKO) or genetically insulin-resistant Irs1-/- mice (called LKO::Irs1 -/-). Viable LKO::Irs1-/- mice were 70% smaller than WT or LKO mice, and 40% smaller than Irs1-/- mice. Hepatic insulin receptors were functional in all the mice, but insulin signaling via the Akt-FoxO1 pathway was reduced in Irs1-/- and LKO liver, and undetected in LKO::Irs1-/- liver; however, Gsk3β phosphorylation (Ser9) and hepatic glycogen stores were nearly normal in all of the mice. LKO and Irs1-/-mice developed insulin resistance and glucose intolerance that never progressed to diabetes, whereas LKO::Irs1 -/-mice developed hyperglycemia and hyperinsulinemia immediately after birth. Regardless, few hepatic genes changed expression significantly in Irs1-/- or LKO mice, whereas hundreds of genes changed in LKO::Irs1-/- mice - including elevated levels of Pck1, G6pc, Ppargc1, Pparg, and Igfbp1. Thus, signals delivered by Irs1 or Irs2 regulate hepatic gene expression that coordinates glucose homeostasis and systemic growth.

Original languageEnglish (US)
Pages (from-to)101-114
Number of pages14
JournalJournal of Clinical Investigation
Volume116
Issue number1
DOIs
StatePublished - Jan 2006

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Homeostasis
Glucose
Liver
Growth
Insulin Receptor
Insulin
Gene Expression
Liver Glycogen
Glucose Intolerance
Hyperinsulinism
Hyperglycemia
Insulin Resistance
Hepatocytes
Phosphorylation
Parturition
Food
Genes

ASJC Scopus subject areas

  • Medicine(all)

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Irs1 and Irs2 signaling is essential for hepatic glucose homeostasis and systemic growth. / Dong, Xiaocheng; Park, Sunmin; Lin, Xueying; Copps, Kyle; Yi, Xianjin; White, Morris F.

In: Journal of Clinical Investigation, Vol. 116, No. 1, 01.2006, p. 101-114.

Research output: Contribution to journalArticle

Dong, Xiaocheng ; Park, Sunmin ; Lin, Xueying ; Copps, Kyle ; Yi, Xianjin ; White, Morris F. / Irs1 and Irs2 signaling is essential for hepatic glucose homeostasis and systemic growth. In: Journal of Clinical Investigation. 2006 ; Vol. 116, No. 1. pp. 101-114.
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