AGFG1 Increases Cholesterol Biosynthesis by Disrupting Intracellular Cholesterol Homeostasis to Promote PDAC Progression

Zonghao Duan,Minwei Yang, Jian Yang,Zheng Wu,Yuheng Zhu,Qinyuan Jia, Xueshiyu Ma,Yifan Yin,Jiahao Zheng, Jianyu Yang,Shuheng Jiang,Lipeng Hu,Junfeng Zhang,Dejun Liu,Yanmiao Huo,Linli Yao,Yongwei Sun

Cancer Letters（2024）

Department of Biliary-Pancreatic Surgery | Shanghai Jiao Tong Univ | State Key Laboratory of Systems Medicine for Cancer

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Abstract

Purpose Cholesterol metabolism reprograming has been acknowledged as a novel feature of cancers. Pancreatic ductal adenocarcinoma (PDAC) is a cancer with a high demand of cholesterol for rapid growth. The underlying mechanism of how cholesterol metabolism homestasis are disturbed in PDAC is explored. Experimental design The relevance between PDAC and cholesterol was confirmed in TCGA database. The expression and clinical association were discovered in TCGA and GEO datasets. Knockdown and overexpression of AGFG1 was adopted to perform function studies. RNA sequencing, cholesterol detection, transmission electron microscope, co-immunoprecipitation, and immunofluorescence et al. were utilized to reveal the underlying mechanism. Results AGFG1 was identified as one gene positively correlated with cholesterol metabolism in PDAC as revealed by bioinformatics analysis. AGFG1 expression was then found associated with poor prognosis in PDAC. AGFG1 knockdown led to decreased proliferation of tumor cells both in vitro and in vivo. By RNA sequencing, we found AGFG1 upregulated expression leads to enhanced intracellular cholesterol biosynthesis. AGFG1 knockdown suppressed cholesterol biosynthesis and an accumulation of cholesterol in the ER. Mechanistically, we confirmed that AGFG1 interacted with CAV1 to relocate cholesterol for the proceeding of cholesterol biosynthesis, therefore causing disorders in intracellular cholesterol metabolism. Conclusions Our study demonstrates the tumor-promoting role of AGFG1 by disturbing cholesterol metabolism homestasis in PDAC. Our study has present a new perspective on cancer therapeutic approach based on cholerstrol metabolism in PDAC.

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Key words

AGFG1,PDAC,Cholesterol biosynthesis,Cholesterol transportation

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