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Related Experiment Videos

Insulin receptor knockout mice.

Tadahiro Kitamura1, C Ronald Kahn, Domenico Accili

  • 1Naomi Berrie Diabetes Center, Department of Medicine, College of Physicians & Surgeons of Columbia University, New York, New York 10032, USA. tk508@columbia.edu

Annual Review of Physiology
|December 10, 2002
PubMed
Summary
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Genetic ablation studies reveal the critical role of the insulin receptor in maintaining fuel homeostasis. Loss of insulin receptors leads to severe diabetes, while cell-specific ablation uncovers novel functions in various tissues.

Area of Science:

  • Endocrinology and Metabolism
  • Genetics and Genomics

Background:

  • The insulin receptor (InsR) is crucial for glucose metabolism and overall fuel homeostasis.
  • Previous studies using genetic ablation have provided insights into InsR function.

Purpose of the Study:

  • To investigate the multifaceted roles of the insulin receptor in regulating fuel homeostasis and embryonic development.
  • To identify novel functions of InsR in specific tissues and signaling pathways.

Main Methods:

  • Genetic ablation studies in mice, including global and conditional knockout models.
  • Analysis of metabolic, reproductive, and developmental phenotypes.
  • Experimental crosses utilizing insulin receptor haploinsufficiency.

Main Results:

Related Experiment Videos

  • Complete InsR knockout in mice leads to early postnatal diabetes and ketoacidosis.
  • Conditional InsR knockout in specific cell types results in mild metabolic and reproductive abnormalities.
  • InsR is essential for embryonic growth, as shown in combined knockout studies with Igf1 receptors.
  • Insulin receptor haploinsufficiency aided in dissecting insulin signaling pathways and identifying novel substrates.

Conclusions:

  • The insulin receptor plays indispensable roles in maintaining fuel homeostasis and regulating embryonic growth.
  • InsR has critical functions in the brain and pancreatic beta-cells.
  • Genetic models of insulin receptor deficiency are powerful tools for understanding insulin action and signaling.