Differential Protein Expression

Differential protein expression analysis identifies proteins exhibiting altered abundance between treatment conditions, disease states, or cell populations providing mechanistic insights into pharmaceutical action. Proteomics techniques including mass spectrometry quantitate protein abundance across thousands of proteins simultaneously. Western blotting and immunohistochemistry provide targeted protein assessment with cellular localisation. Antibody microarrays enable rapid high-throughput protein profiling.

Therapeutic applications employ differential expression data identifying pharmacodynamic biomarkers validating target engagement. Disease mechanism understanding through protein expression profiling guides therapeutic target selection. Resistance mechanism identification reveals pathway activation compensating for primary target inhibition. Patient stratification based on protein expression predicts treatment response and prognosis optimising therapy selection. Biomarker validation requires prospective clinical confirmation demonstrating predictive utility. Integration with genomic and metabolomic data enhances mechanistic understanding.