[en] [en] BACKGROUND & AIMS: Pancreatic cancer has the highest prevalence of cancer-associated cachexia among all cancers. ZIP4 promotes pancreatic cancer progression by regulating oncogenic miR-373, and perturbation of circular RNAs (circRNAs) is associated with cancer aggressiveness. This study aimed to identify circRNAs involved in ZIP4/miR-373-driven cancer growth and cachexia and decipher the underlying mechanism.
METHODS: Differentially expressed circRNAs and potential targets of microRNA were identified through in silico analysis. The RNA interactions were determined by means of biotinylated microRNA pulldown, RNA immunoprecipitation, and luciferase reporter assays. The function of circRNA in ZIP4-miR-373 signaling axis were examined in human pancreatic cancer cells, 3-dimensional spheroids and organoids, mouse models, and clinical specimens. Mouse skeletal muscles were analyzed by means of histology.
RESULTS: We identified circANAPC7 as a sponge for miR-373, which inhibited tumor growth and muscle wasting in vitro and in vivo. Mechanistic studies showed that PHLPP2 is a downstream target of ZIP4/miR-373. CircANAPC7 functions through PHLPP2-mediated dephosphorylation of AKT, thus suppressing cancer cell proliferation by down-regulating cyclin D1 and inhibiting muscle wasting via decreasing the secretion of transforming growth factor-β through STAT5. We further demonstrated that PHLPP2 induced dephosphorylation of CREB, a zinc-dependent transcription factor activated by ZIP4, thereby forming a CREB-miR-373-PHLPP2 feed-forward loop to regulate tumor progression and cancer cachexia.
CONCLUSION: This study identified circANAPC7 as a novel tumor suppressor, which functions through the CREB-miR-373-PHLPP2 axis, leading to AKT dephosphorylation, and cyclin D1 and transforming growth factor-β down-regulation to suppress tumor growth and muscle wasting in pancreatic cancer.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Shi, Xiuhui ✱; Université de Liège - ULiège > Département de pharmacie ; Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, Department of Surgery, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Yang, Jingxuan ✱; Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, Department of Surgery, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Liu, Mingyang ✱; Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, Department of Surgery, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Zhang, Yuqing ✱; Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, Department of Surgery, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Zhou, Zhijun ✱; Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, Department of Surgery, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Luo, Wenyi; Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Fung, Kar-Ming; Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Xu, Chao; Department of Biostatistics and Epidemiology, Hudson College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Bronze, Michael S; Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Houchen, Courtney W; Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
Li, Min ; Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, Department of Surgery, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma. Electronic address: Min-Li@ouhsc.edu
✱ These authors have contributed equally to this work.
Language :
English
Title :
Circular RNA ANAPC7 Inhibits Tumor Growth and Muscle Wasting via PHLPP2-AKT-TGF-β Signaling Axis in Pancreatic Cancer.
William and Ella Owens Medical Research Foundation
Funding text :
Funding This work was supported in part by the William and Ella Owens Medical Research Foundation (Min Li), United States; Department of Medicine at University of Oklahoma Health Sciences Center, United States.
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