Dynamic Proteomics Reveals High Plasticity of Cellular Proteome: Growth-Related and Drug-Induced Changes in Cancer...

Area of Science:

• Chemical Proteomics
• Cellular Biology
• Drug Discovery

Background:

• Chemical proteomics identifies drug targets by analyzing proteome changes.
• Cultured cells exhibit natural proteome alterations due to media, confluence, cell division, and metabolism.
• These endogenous changes are often assumed to be less significant than drug-induced effects.

Purpose of the Study:

• To investigate the magnitude of growth-related proteome changes in untreated cells.
• To compare these endogenous changes with drug-induced proteome alterations.
• To emphasize the importance of time-matched controls in chemical proteomics studies.

Main Methods:

• Deep proteomics analysis was performed on two well-characterized cancer cell lines.
• Quantified over 10,481 proteins with at least two peptides.
• Compared proteome profiles of untreated control cells with drug-treated cells over 48 hours.

Main Results:

• Growth-related proteome changes in untreated cells were comparable in magnitude to drug-induced changes.
• Common trends observed: downregulation of cell division and upregulation of metabolism-related pathways.
• Significant proteome plasticity was evident even before 100% cell confluence.

Conclusions:

• Endogenous proteome variations can significantly impact the interpretation of drug-induced changes.
• The study underscores the critical need for using time-matched controls in chemical proteomics.
• Accurate assessment of drug effects requires accounting for inherent cellular dynamics.