ABSTRACT
Objective To investigate the radioresistance factors in non-small cell lung cancer (NSCLC)cell line A549, and provide new targets for radiotherapy sensitization drugs development. Methods Establish the stable model of radioresistant NSCLC cell line A549 under irradiation; investigate the whole-transcriptome alteration of radioresistance cell line and radiosensitive cell line using gene expression microarray; perform bioinformatic approaches gene ontology (GO) analysis and Pathway analysis. Results The expression profile microarray showed that 1410 differentially expressed genes (733 up-regulated and 677 down-regulated) were detected in resistant and sensitive strains; GO analysis showed that it was mainly related to cell cycle and DNA replication; Pathway significant enrichment analysis showed that mitogen-activated protein kiase(MAPK) signaling pathway, phosphatidylinositol 3-kinase/protein kinase B(PI3K/Akt) signaling pathway, were mainly associated with radioresistance. Conclusion Multiple genes and signaling pathways are involved in radioresistance, further studies are needed to investigate the radioresistance factors, which could provide new targets for radiotherapy sensitization drugs development.