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Noh, Joo Kyung; Woo, Seon Rang; Kong, Moonkyoo; Lee, Min Kyeong; Lee, Jung Woo; Lee, Young Chan; Ko, Seong‐Gyu; Eun, Young‐Gyu
Molecular oncology, January 2023, Volume: 17, Issue: 1Journal Article
Although numerous studies have used systemic approaches to identify prognostic predictors in oral squamous cell carcinoma (OSCC), the effectiveness of these approaches has not been assessed clinically. Further, the mechanism underlying malignant behaviors in OSCC is poorly characterized. This study aimed to develop and verify accurate prognostic predictors for OSCC patients and assess the associated biology. We identified an OSCC‐recurrence‐related gene signature (ORGS) using a Cox regression analysis. Functional enrichment analysis was used to identify enriched pathways and biological processes to reveal the underlying mechanism of OSCC malignant behavior. The ORGS successfully divided OSCC patients into low‐ and high‐risk groups with significantly different overall survivals. Pathway analysis revealed oxidative phosphorylation (OXPHOS) as a signaling pathway associated with the ORGS in OSCC. Interestingly, high OXPHOS status was strongly associated with poor overall survival in OSCC patients. Mediator complex subunit 30 (MED30) was a predicted upstream regulator of OXPHOS, and knockdown of MED30 reduced histone acetylation. We identified that the ORGS was strongly correlated with OXPHOS regulatory processes, suggesting OXPHOS as a key mechanism leading to poor prognosis in OSCC. Here, we define a gene signature from oral squamous cell carcinoma (OSCC) patients which could stratify patients into low and high‐risk groups with different overall survival. We highlight oxidative phosphorylation (OXPHOS) as a signaling pathway associated with this signature. Finally, we demonstrate that MED30‐induced OXPHOS gene transcription depolarizes mitochondrial membrane potential and inhibits ROS‐dependent apoptosis of cancer cells.
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