Quantitative proteomics reveals coordinated changes in the proteome during replicative senescence.

Proteome changes during replicative senescence are highly coordinated, with widespread chromatin protein depletion and increased mitochondrial insolubility, affecting cellular function.

• Why it matters: Understanding proteome dynamics in senescence is crucial because accumulation of senescent cells impairs tissue function and drives aging-related diseases, yet the detailed molecular changes remain unclear.
• What they did: Using mass spectrometry-based proteomics, the study analyzed multiple levels of proteome alterations during senescence, identifying key shifts such as depletion of translation machinery and chromatin proteins, and increased mitochondrial insolubility.
• The result: These findings reveal a distinctive senescent proteome signature linked to proteostasis disruption, providing a valuable resource for exploring molecular mechanisms and potential therapeutic targets in aging and age-related diseases.