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The human bronchial epithelial cells (HBE) and K-ras-silenced HBE cells were treated with fine particulate matter (PM 2.5 ) samples from Taiyuan for 24 h. To screen the proteomic characteristics of PM 2.5 -induced differentially expressed proteins (DEPs), the Q Exactive mass spectrometer was used. Gene ontology (GO) analysis, Kyoto encyclopedia of genes and genomes (KEGG) analysis, functional prediction, protein–protein interaction (PPI) network analysis, and visualization of differential protein interactions were performed. 251 DEPs in K-ras silenced cells and 535 DEPs in normal HBE cells were identified, respectively. KEGG analysis showed that the differentially expressed proteins of PM 2.5 -treated cells were related to the biosynthesis of ribosomes, antibiotics, and amino acids. On the other hand, K-ras silenced cells were related to metabolic pathways, RNA transport, and DNA replication. Through the construction of a PPI network, the top 10 hub proteins were screened from the two cell groups, among which MRPL13, RPS20, and EIF1AX were of great significance. Our results indicated that the K-ras gene plays an important role in PM 2.5 -induced DEPs, and the findings provide a scientific basis for the further study of PM 2.5  toxic mechanisms and biomarkers.

Proteomic characteristics of PM 2.5 -induced differentially expressed proteins in k-ras-silenced HBE cells