The case for space as a model of accelerated aging

Area of Science:

• Gerontology and Space Medicine
• Environmental Stress Biology
• Multi-omic Systems Biology

Background:

• Aging is a complex challenge with limited human models.
• Model organisms offer insights but lack physiological relevance.
• Astronauts, though healthy, exhibit accelerated aging hallmarks.

Purpose of the Study:

• To position spaceflight as a powerful human model for aging research.
• To investigate how spaceflight environmental factors impact aging mechanisms.
• To advance understanding of both astronaut health and aging populations on Earth.

Main Methods:

• Studying astronauts as a human model for aging.
• Analyzing the effects of microgravity, circadian disruption, radiation, and isolation.
• Tracing environmental factors' impact on mitochondrial dysfunction, cytoskeletal dynamics, and inflammation.

Main Results:

• Astronauts show declines in cardiovascular, musculoskeletal, cognitive, and immune function.
• These declines are comparable to aging on Earth, often on accelerated timelines.
• Spaceflight exposures drive canonical hallmarks of aging.

Conclusions:

• Spaceflight serves as a unique model for studying human aging.
• Environmental stress biology and multi-omic approaches are key to understanding aging.
• Findings can benefit both astronaut health and aging populations on Earth.