Molecular Regulation of SASP in Cellular Senescence: Therapeutic Implications and Translational Challenges

Area of Science:

• Gerontology and cellular biology
• Molecular mechanisms of aging and disease

Background:

• Cellular senescence is a state of irreversible cell cycle arrest contributing to aging and diseases such as cancer and neurodegeneration.
• Senescence is characterized by distinct morphological changes and the development of a senescence-associated secretory phenotype (SASP), releasing pro-inflammatory factors.
• The SASP can negatively impact surrounding tissues, exacerbating age-related pathologies.

Purpose of the Study:

• To elucidate the molecular mechanisms governing cellular senescence.
• To explore the role of key regulatory pathways, including p53/p21 and p16INK4a/pRb, in inducing cell cycle arrest.
• To review emerging therapeutic strategies, senolytics and senomorphics, for targeting senescent cells.

Main Methods:

• Review of molecular mechanisms regulating senescence.
• Analysis of the p53/p21 and p16INK4a/pRb pathways in cell cycle arrest.
• Examination of senolytic and senomorphic therapies.

Main Results:

• The p53/p21 and p16INK4a/pRb pathways are critical for inducing and maintaining cell cycle arrest in senescence.
• While protective against cancer, sustained activation of cyclin inhibitors can lead to pathological outcomes.
• Senolytics and senomorphics represent potential therapeutic avenues for managing senescence-related diseases.

Conclusions:

• Understanding the molecular basis of senescence is crucial for developing effective treatments.
• Targeting cellular senescence holds significant promise for improving healthspan and treating diverse age-related diseases.
• Therapeutic interventions like senolytics and senomorphics offer novel strategies to combat the detrimental effects of senescence.