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Related Experiment Videos

The GH/IGF-I axis and longevity.

Martin Holzenberger1

  • 1Inserm U515, Hopital Saint-Antoine, 184 rue Fbg St-Antoine, 75571 Paris 12, France. holzenberger@st-antoine.inserm.fr

European Journal of Endocrinology
|September 2, 2004
PubMed
Summary
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Downregulating insulin-like growth factor 1 (IGF-1) signaling extends lifespan in mice. This research shows IGF-1 receptor knockout mice live longer and resist oxidative stress, suggesting a key role for IGF-1 in aging.

Area of Science:

  • Genetics and Molecular Biology
  • Aging Research
  • Endocrinology

Background:

  • The aging process is influenced by genes regulating the somatotroph axis, including insulin-like signaling pathways.
  • Studies in model organisms (C. elegans, flies) and mice with pituitary hormone deficiency indicate that reduced somatotroph axis activity can slow aging.
  • Pharmacological growth hormone (GH) administration has shown potential in restoring youthful traits, raising questions about its mechanism.

Purpose of the Study:

  • To investigate the role of insulin-like growth factor 1 receptor (IGF1R) in mammalian lifespan and aging.
  • To explore the physiological and molecular consequences of reduced IGF1R signaling in mice.

Main Methods:

  • Phenotypic analysis of heterozygous IGF-I receptor (IGF1R) knockout mice.

Related Experiment Videos

  • Assessment of lifespan, health, physiology, glucose tolerance, and oxidative stress resistance.
  • Identification of molecular pathways potentially linking IGF1R signaling to oxidative stress resistance.

    • Main Results:

    • IGF1R(+/-) mutant mice exhibited significantly longer lifespans compared to control littermates.
    • Mutant mice showed increased resistance to oxidative stress in vivo.
    • A molecular pathway involving IGF1R underphosphorylation, reduced p66Shc activation, and enhanced oxidative stress resistance was identified.
    • Reduced glucose tolerance was observed in male IGF1R(+/-) mutants.

    Conclusions:

    • Continuous, long-term downregulation of IGF signaling can increase lifespan in mammals.
    • Reduced IGF1R signaling confers resistance to oxidative stress, a key factor in aging.
    • The findings suggest that IGF-1 signaling is a critical regulator of mammalian lifespan and aging, independent of potential GH effects.