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Chromatin Remodeler RSF1 as an Oncogenic Driver and Therapeutic Target in Esophageal Squamous Cell Carcinoma

ABSTRACT: Esophageal squamous cell carcinoma (ESCC) is a prevalent malignancy, ranking eleventh in inci-dence and seventh in mortality globally. Remodeling and Spacing factor 1 (RSF1), a chromatin remodeling factor, is frequently overexpressed in various tumors and correlates with poor prog-nosis. This study, combining public database analysis and clinical sample validation, reveals sig-nificantly elevated RSF1 expression in ESCC tumor tissues, confirmed further in an ESCC orthotopic model. Functional assays show that RSF1 knockout (KO) significantly inhibits ESCC cell proliferation, migration, invasion, and in vivo tumor growth, while reintroducing RSF1 restores its oncogenic effects. Proteomic analysis highlight RSF1 KO disrupts pathways associated with cell cycle control, apoptosis, and focal adhesion. Experimentally, RSF1 KO induces apoptosis and G2/M arrest, estab-lishing its essential role in ESCC progression. Collectively, these findings establish RSF1 an oncogenic driver and a promising therapeutic target in ESCC

ORGANISM(S): Homo Sapiens

SUBMITTER: Hengbin Wang

PROVIDER: PXD067025 | iProX | Thu Aug 07 00:00:00 BST 2025

REPOSITORIES: iProX

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Project description:Background: Esophageal squamous cell carcinoma (ESCC) is a common invasive malignancy worldwide with poor clinical outcomes. Increasing amount of long non-coding RNAs (lncRNAs) have been reported to be involved in cancer development. However, lncRNAs that are functional in ESCC and the underlying molecular mechanisms remain largely unknown. Methods: Transcriptomic analysis was performed to identify dysregulated lncRNAs in ESCC tissue samples. The high expression of LINC00680 in ESCC was validated by RT-qPCR, and the oncogenic functions of LINC00680 was investigated by cell proliferation, colony formation, migration and invasion assays in ESCC cells in vitro and xenografts derived from ESCC cells in mice. RNA-seq, competitive endogenous RNA (ceRNA) network analysis, and luciferase reporter assays were carried out to identify LINC00680 target genes and the microRNAs (miRNAs) bound to LINC00680. Antisense oligonucleotides (ASOs) were used for in vivo treatment. Results: Transcriptome profiling revealed that a large number of lncRNAs was dysregulated in ESCC tissues. Notably, LINC00680 was highly expressed, and upregulation of LINC00680 was associated with large tumor size, advanced tumor stage, and poor prognosis. Functionally, knockdown of LINC00680 restrained ESCC cell proliferation, colony formation, migration, and invasion in vitro and inhibited tumor growth in vivo. Mechanistically, LINC00680 was found to act as a ceRNA by sponging miR-423-5p to regulate PAK6 (p21-activated kinase 6) expression in ESCC cells. The cell viability and motility inhibition induced by LINC00680 knockdown was significantly reversed upon PAK6 restoration and miR-423-5p inhibition. Furthermore, ASO targeting LINC00680 substantially suppressed ESCC both in vitro and in vivo. Conclusions: An oncogenic lncRNA, LINC00680, was identified in ESCC, which functions as a ceRNA by sponging miR-423-5p to promote PAK6 expression and ESCC. LINC00680/miR-423-5p/PAK6 axis may serve as promising diagnostic and prognostic biomarkers and therapeutic targets for ESCC.

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Chromatin Remodeler RSF1 as an Oncogenic Driver and Therapeutic Target in Esophageal Squamous Cell Carcinoma

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