Related Experiment Video

Updated: Aug 11, 2026

A Cre-Lox P Recombination Approach for the Detection of Cell Fusion In Vivo
08:13

A Cre-Lox P Recombination Approach for the Detection of Cell Fusion In Vivo

Published on: January 4, 2012

[First advances in molecular endocrinology obtained using the Cre/LoxP system]

Iu A Pankov1

  • 1yuri-pankov@mtu-net.ru

Molekuliarnaia Biologiia
|July 11, 2001
PubMed

Insights

Liver-produced insulin-like growth factor I (IGF-I) plays a role in growth and insulin sensitivity. Disrupting liver IGF-I or insulin genes can lead to insulin resistance in mice.

Area of Science:

  • Endocrinology and Metabolism
  • Molecular Biology
  • Genetics

Context:

  • Insulin-like Growth Factor I (IGF-I), primarily produced in the liver, mediates Growth Hormone (GH) effects.
  • Liver-specific IGF-I knockout mice exhibit mild growth disturbances but develop significant insulin resistance.
  • Insulin resistance is also observed in mice with liver-specific insulin gene knockout.

Purpose:

  • To investigate the role of liver-derived IGF-I in overall growth and metabolic regulation.
  • To explore the impact of genetic modifications in the liver on insulin sensitivity.
  • To understand the function of glucokinase in pancreatic insulin secretion.

Summary:

  • Liver-specific knockout of IGF-I in mice leads to insulin resistance in multiple organs, including muscles, despite only slightly affecting growth.
  • Knocking out the insulin gene in the liver also results in insulin resistance.
  • Selective inactivation of glucokinase, an insulin target, in pancreatic islets or the liver impairs insulin secretion.

Impact:

  • Highlights the critical role of the liver in IGF-I production and its contribution to systemic insulin sensitivity.
  • Provides insights into the complex interplay between growth hormone, IGF-I, insulin, and glucose metabolism.
  • Suggests potential therapeutic targets for metabolic disorders related to insulin resistance and impaired insulin secretion.

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