Is DNA damage indispensable for stress-induced senescence?

Area of Science:

• Cell Biology
• Molecular Biology
• Gerontology

Background:

• Cellular senescence is a permanent cell cycle arrest crucial in development, aging, and disease.
• Senescent cells exhibit metabolic activity and secrete pro-inflammatory factors.
• Cellular senescence is typically induced by stress, notably DNA double-strand breaks (DSBs) activating DNA damage response (DDR).

Purpose of the Study:

• To review the mechanisms of cellular senescence.
• To investigate the possibility of senescence induction independent of DNA damage response (DDR) or DNA double-strand breaks (DSBs).

Main Methods:

• Literature review of existing research on cellular senescence.
• Analysis of data from various studies, including the authors' own findings.
• Discussion of stress-induced senescence pathways.

Main Results:

• Cellular senescence is a complex stress response with multiple potential triggers.
• Evidence suggests senescence may occur without canonical DNA damage response (DDR) pathways.
• The role of unrepaired DNA double-strand breaks (DSBs) as a senescence trigger is well-established.

Conclusions:

• Cellular senescence can be induced through various pathways, not solely reliant on DNA damage.
• Further research is needed to fully elucidate the conditions under which senescence occurs with or without DDR.
• Understanding these diverse pathways is critical for addressing age-related diseases.