Robust multiparametric assessment of cellular senescence

Area of Science:

• Cellular and Molecular Biology
• Aging Research
• Cancer Biology

Background:

• Cellular senescence is crucial for tumor suppression and age-related tissue dysfunction.
• Identifying senescent cells in vivo has been challenging due to a lack of specific markers.
• Understanding senescence in living organisms is vital for aging and disease research.

Purpose of the Study:

• To establish reliable methods for identifying and quantifying senescent cells in vivo.
• To validate a novel combination of markers for precise senescence detection.
• To provide protocols for applying these markers in research.

Main Methods:

• Compared multiple candidate senescence markers using a dynamic stimulation model.
• Validated marker robustness by assessing precision in senescent cell fraction estimation.
• Developed dual immunofluorescence protocols for Ki67/PCNA and γH2AX quantification.

Main Results:

• The combination of absent proliferation markers (Ki67, PCNA) and high DNA damage foci (>5 γH2AX/nucleus) is the most accurate indicator of senescence.
• This marker set demonstrated high precision in quantifying senescent cells.
• Protocols are effective in both fixed cells and paraffin-embedded tissues.

Conclusions:

• A robust method for identifying cellular senescence in vivo has been established.
• This quantitative approach enhances the study of senescence's role in aging and disease.
• The described protocols facilitate future research on cellular senescence.