Sex, senescence, senolytics, and cognition

Area of Science:

• Gerontology
• Neuroscience
• Cell Biology

Background:

• Cellular senescence, a state of irreversible cell cycle arrest, is a hallmark of aging, driven by stressors like DNA damage and oxidative stress.
• Senescent cells release pro-inflammatory cytokines, contributing to systemic inflammation and neuroinflammation, which impairs neuronal function and promotes cognitive decline.
• Sexual dimorphism exists in aging processes and age-related diseases, potentially linked to sex differences in cell senescence and inflammation.

Purpose of the Study:

• To review the role of sexual dimorphism in cellular senescence and its impact on brain health and age-related cognitive decline.
• To explore the efficacy and sex-specific responses to senolytic treatments targeting senescent cells.
• To understand the interplay between sex hormones, particularly estrogen, and cellular senescence in the aging brain.

Main Methods:

• Literature review synthesizing current research on cellular senescence, neuroinflammation, cognitive decline, and sex differences.
• Analysis of studies investigating senolytic interventions in the context of aging and sex.
• Examination of the molecular mechanisms underlying sex-specific responses to senescence and senolytics.

Main Results:

• Senescent cells contribute to neuroinflammation and altered neuronal physiology, leading to cognitive decline, with sex differences observed in senescence patterns.
• Senolytic therapies can ameliorate age-related functional decline by removing senescent cells, but responses vary between males and females.
• Estrogen influences senescence pathways and has independent anti-aging effects on neurophysiology, interacting with senolytic drug mechanisms.

Conclusions:

• Sexual dimorphism in cellular senescence and inflammation significantly impacts brain aging and cognitive function.
• Senolytic treatments offer therapeutic potential for age-related cognitive decline, but their efficacy is modulated by sex and hormonal status.
• Understanding the complex interplay between sex hormones, senescence, and neurobiology is crucial for developing effective, sex-specific anti-aging strategies.