Abstract
BACKGROUND: Lung adenocarcinoma (LUAD) stands as a prevalent malignancy, yet its pathology remains incompletely comprehended. METHODS: In this comprehensive study, we explored the roles of the pituitary tumor-transforming gene (PTTG) family, including PTTG1, PTTG2, and the pseudogene PTTG3P in lung adenocarcinoma (LUAD). Employing a multi-faceted approach, we conducted in-depth analyses using clinical samples and expression datasets. RESULTS: Our findings revealed a significant up-regulation of PTTG family genes in LUAD cell lines and tissue samples compared to adjacent normal controls, suggesting their potential as diagnostic biomarkers. Through promoter methylation and mutational analyses, we uncovered regulatory mechanisms influencing PTTG gene expression. The exploration of the PTTG family's impact on LUAD patient survival demonstrated their association with adverse outcomes, emphasizing their potential prognostic relevance. Moreover, functional assays demonstrated that the knockdown of PTTG1 and PTTG2 genes resulted in the reduction of cell proliferation, colony formation, and cell migration abilities in A549 and H1975 LUAD cells. Furthermore, our investigation extended to therapeutic avenues, where we identified Calcitriol as a potential drug within the DrugBank database to down-regulate PTTG genes. Molecular docking analyses provided insights into the strong interaction between Calcitriol and PTTG1/PTTG2 proteins, laying the groundwork for further exploration of Calcitriol in LUAD treatment. CONCLUSION: In conclusion, this study contributes a comprehensive understanding of the PTTG family's involvement in LUAD, shedding light on their diagnostic, prognostic, and therapeutic implications.