RUNX3-mediated circDYRK1A inhibits glutamine metabolism in gastric cancer by up-regulating microRNA-889-3p-dependent FBXO4

J Transl Med. 2022 Mar 10;20(1):120. doi: 10.1186/s12967-022-03286-x.

Abstract

Background: Targeting glutamine metabolism is previously indicated as a potential and attractive strategy for gastric cancer (GC) therapy. However, the underlying mechanisms responsible for the modification of glutamine metabolism in GC cells have not been fully elucidated. Accordingly, the current study sought to investigate the physiological mechanisms of RUNX3-mediated circDYRK1A in glutamine metabolism of GC.

Methods: Firstly, GC tissues and adjacent normal tissues were obtained from 50 GC patients to determine circDYRK1A expression in GC tissues. Next, the binding affinity among RUNX3, circDYRK1A, miR-889-3p, and FBXO4 was detected to clarify the mechanistic basis. Moreover, GC cells were subjected to ectopic expression and knockdown manipulations of circDYRK1A, miR-889-3p, and/or FBXO4 to assay GC cell malignant phenotypes, levels of glutamine, glutamic acid, and α-KG in cell supernatant and glutamine metabolism-related proteins (GLS and GDH). Finally, nude mice were xenografted with GC cells to explore the in vivo effects of circDYRK1A on the tumorigenicity and apoptosis.

Results: circDYRK1A was found to be poorly expressed in GC tissues. RUNX3 was validated to bind to the circDYRK1A promoter, and circDYRK1A functioned as a miR-889-3p sponge to up-regulate FBXO4 expression. Moreover, RUNX3-upregulated circDYRK1A reduced levels of glutamine, glutamic acid, and α-KG, and protein levels of GLS and GDH, and further diminished malignant phenotypes in vitro. Furthermore, in vivo experimentation substantiated that circDYRK1A inhibited the tumorigenicity and augmented the apoptosis in GC.

Conclusion: In conclusion, these findings highlighted the significance and mechanism of RUNX3-mediated circDYRK1A in suppressing glutamine metabolism in GC via the miR-889-3p/FBXO4 axis.

Keywords: CircDYRK1A; FBXO4; Gastric cancer; Glutamine metabolism; MicroRNA-889-3p; RUNX3; Sponge.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Line, Tumor
  • Cell Proliferation / genetics
  • Core Binding Factor Alpha 3 Subunit / genetics
  • Core Binding Factor Alpha 3 Subunit / metabolism
  • F-Box Proteins* / genetics
  • F-Box Proteins* / metabolism
  • Gene Expression Regulation, Neoplastic
  • Glutamine / metabolism
  • Humans
  • Mice
  • Mice, Nude
  • MicroRNAs* / genetics
  • MicroRNAs* / metabolism
  • Stomach Neoplasms* / pathology

Substances

  • Core Binding Factor Alpha 3 Subunit
  • F-Box Proteins
  • FBXO4 protein, human
  • MicroRNAs
  • Runx3 protein, human
  • Glutamine