Stress resistance in long-lived mouse models.

Area of Science:

• Gerontology
• Cellular Biology
• Molecular Biology

Background:

• Long-lived mouse models, such as Ames and Snell dwarf mice, exhibit altered hormonal profiles, notably reduced Insulin-like Growth Factor 1 (IGF-1).
• These hormonal changes are associated with enhanced cellular resistance to various stressors, including UV radiation, oxidative stress, heat, and cadmium.
• Cellular stress resistance is also noted in other long-lived mouse models and in vitro caloric restriction systems.

Purpose of the Study:

• To summarize the molecular underpinnings of cellular stress resistance.
• To explore the connection between cellular stress resistance and longevity.
• To discuss the role of stress resistance in diverse biological systems.

Main Methods:

• Comparative analysis of long-lived mouse models with distinct genetic and hormonal characteristics.
• Investigation of cellular responses to various environmental and chemical stressors.
• Examination of the insulin/IGF-1-FOXO signaling pathway and its relation to longevity.

Main Results:

• Long-lived mice with low IGF-1 levels demonstrate increased resistance to multiple forms of cellular stress.
• Cells from these mice are also resistant to carcinogen-induced damage and oxygen-induced senescence.
• Inhibition of the insulin/IGF-1-FOXO pathway is a common feature in many long-lived mouse systems, suggesting a shared mechanism for extended lifespan.

Conclusions:

• Cellular stress resistance is a significant factor contributing to longevity.
• The insulin/IGF-1-FOXO pathway plays a crucial role in mediating stress resistance and lifespan.
• Understanding cellular stress resistance mechanisms may offer insights into combating age-related diseases.