Vascular Senescence: A Potential Bridge Between Physiological Aging and Neurogenic Decline

Area of Science:

• Neuroscience
• Aging Research
• Stem Cell Biology

Background:

• Adult mammalian brains possess neural stem cells (NSCs) in niches, generating neurons throughout life.
• NSC neurogenesis declines with age, influenced by niche microenvironments and systemic factors.
• The brain's vasculature plays a critical role in regulating NSC behavior and neurogenesis.

Purpose of the Study:

• To review the impact of vascular senescence and blood-borne factors on age-related decline in NSC potential.
• To explore the mechanisms linking vascular aging, inflammation, and impaired neurogenesis.
• To highlight potential therapeutic strategies, such as senolysis, for age-dependent brain decline.

Main Methods:

• Review of existing literature on neurogenesis, aging, vasculature, and senescence.
• Analysis of studies involving parabiosis and heterochronic parabionts to assess blood-borne factors.
• Examination of cellular and molecular signaling pathways involved in NSC regulation.

Main Results:

• Aging alters brain vasculature structure and function, impacting NSC regulation.
• Age-associated changes in blood composition contribute to impaired adult neurogenesis.
• Senescent cells accumulate, releasing detrimental signals that negatively affect NSCs.

Conclusions:

• Vascular senescence and circulating pro-senescence factors are key contributors to reduced NSC potential in aging.
• Understanding these mechanisms is crucial for developing therapies to combat age-related cognitive decline.
• Senolysis emerges as a promising therapeutic avenue to target age-dependent brain aging.