Exploring the Target Genes of Fucosylated Chondroitin Sulfate in Treating Lung Adenocarcinoma Based on the Integration of Bioinformatics Analysis, Molecular Docking, and Experimental Verification.

Fucosylated chondroitin sulfate (FCS), extracted from sea cucumbers' body walls, has been found to inhibit the proliferation of lung adenocarcinoma (LUAD) cells. However, there have been few studies of the associated drug targets. This study combined bioinformatics analysis and molecular docking to screen the main targets of FCS intervention in LUAD. Moreover, an experimental validation was performed. First, we downloaded the LUAD gene data set from The Cancer Genome Atlas (TCGA) database and the cisplatin (DDP) resistance gene data set of LUAD A549 cells from the Gene Expression Omnibus (GEO) database. Nine significant genes (PLK1, BUB1, CDK1, CDC20, CCNB1, BUB1B, KIF11, CCNB2, and DLAGP5) were identified by bioinformatics analysis, and these nine genes overlapped in both data sets. Then, molecular docking results showed that FCS had a better affinity with target proteins BUB1 and PLK1. Further experimental verification revealed that FCS inhibited the growth of A549 cells and increased the sensitivity of A549 cells to DDP. Quantitative real-time polymerase chain reaction (qRT-PCR) revealed that A549 cells treated with FCS exhibited down-regulated BUB1 and PLK1 mRNA expression. At the same time, FCS+DDP treatment resulted in a more significant reduction in BUB1 and PLK1 mRNA expression than DDP or FCS treatment alone. These findings reveal potential targets of FCS for LUAD and provide clues for the development of FCS as a potential anticancer agent.