Cellular Senescence in Neurodegenerative Diseases

Area of Science:

• Cellular and Molecular Biology
• Neuroscience
• Aging Research

Background:

• Cellular senescence is a state of irreversible cell cycle arrest with implications for tissue aging and regeneration.
• An increased presence of senescent cells is observed in various neurodegenerative diseases, suggesting their involvement in disease pathophysiology.
• Factors like DNA damage, oxidative stress, neuroinflammation, and altered proteostasis contribute to senescence induction.

Purpose of the Study:

• To review the shared neuropathological events in neurodegenerative diseases.
• To summarize the evidence linking cellular senescence to the onset or exacerbation of neurodegenerative disorders.
• To explore the potential of targeting cellular senescence for novel therapeutic strategies.

Main Methods:

• Literature review of studies on cellular senescence and neurodegenerative diseases.
• Analysis of shared neuropathological mechanisms including oxidative stress, neuroinflammation, and proteostasis.
• Synthesis of evidence associating senescence with Alzheimer's disease, Down syndrome, and Parkinson's disease.

Main Results:

• Oxidative stress and neuroinflammation are key factors exacerbating senescence and contributing to neuronal dysfunction and death.
• Altered proteostasis in senescence can lead to the accumulation of misfolded or aggregated proteins, a hallmark of neurodegeneration.
• Cellular senescence is implicated in the progression of cognitive decline, synapse loss, and neuronal degeneration.

Conclusions:

• Cellular senescence is a significant contributor to the pathophysiology of neurodegenerative diseases.
• Shared mechanisms like oxidative stress, neuroinflammation, and proteostasis disruption link senescence to diseases such as AD, DS, and PD.
• Targeting cellular senescence presents a promising avenue for developing new treatments for neurodegenerative disorders.