Tumour suppressors and cellular senescence

Area of Science:

• Gerontology
• Molecular Biology
• Oncology

Background:

• Cellular senescence is a state of stable cell cycle arrest triggered by various cellular stresses.
• Initially, senescence functions as a tumor suppressor by eliminating potentially cancerous cells during early adult life.
• However, in later life, senescent cell accumulation impairs tissue repair and regeneration, contributing to organismal aging.

Purpose of the Study:

• To review the molecular pathways underlying cellular senescence.
• To elucidate the dual role of senescence in tumor suppression and aging.
• To discuss how senescence impacts tissue homeostasis and disease progression.

Main Methods:

• Literature review of molecular pathways involved in cellular senescence.
• Analysis of the role of senescence in embryonic development and early adult life.
• Examination of the contribution of senescent cells to aging and age-related diseases.

Main Results:

• Senescence is initiated by stimuli like telomere shortening and genotoxic stress.
• Senescence acts as a tumor suppressor by removing pre-cancerous cells.
• Accumulation of senescent cells promotes aging through inflammation and impaired regeneration.

Conclusions:

• Cellular senescence has a context-dependent role, acting as a tumor suppressor early in life and a driver of aging later.
• The senescence-associated secretory phenotype (SASP) contributes to both tumor suppression and promotion, as well as aging.
• Understanding senescence pathways is crucial for developing therapeutic strategies targeting aging and cancer.