Long noncoding RNA TMPO-AS1 upregulates chromosomal passenger complex expression to promote cell proliferation in lung cancer via sponging microRNA let-7b-5p

Lung adenocarcinoma patients have poorer prognosis due to higher levels of CPCs, TMPO-AS1, and E2F1. A sponge complex between TMPO-AS1 and hsa-let-7b-5p may contribute to the tumor progression, and targeting CPCs with natural compounds could offer therapeutic potential. Highlights 1. The overexpression of chromosomal passenger complex genes, AURKB, BIRC5, CDCA8, and INCENP is significantly associated with poor prognosis in lung adenocarcinoma (LUAD), particularly among smokers. 2. The competing endogenous RNA (ceRNA) axis, which involves the long non-coding RNA TMPO-AS1 and the miRNA hsa-let-7b-5p, regulates the expression of these CPC genes. TMPO-AS1 shows a positive correlation with CPC genes, while hsa-let-7b-5p shows a negative correlation. 3. Survival analysis indicates that the combined expression of CPC genes, TMPO-AS1, hsa-let-7b-5p, and E2F1 may serve as a reliable prognostic biomarker panel for LUAD in smokers. 4. Hesperidin exhibits a strong binding affinity to CPC proteins, particularly AURKB, when compared to Barasertib, Docetaxel, and Paclitaxel, highlighting its potential as a therapeutic agent. 5. The overexpression of CPC genes, E2F1, and TMPO-AS1 in LUAD is strongly associated with reduced infiltration of CD4⁺ T cells, indicating their role in promoting an immunosuppressive tumor microenvironment.