lncRNAs UC.145 and PRKG1-AS1 Determine the Functional Output of DKK1 in Regulating the Wnt Signaling Pathway in Gastric Cancer.
Jung Ho YoonHyojoo ByunCristina IvanGeorge A CalinDahyun JungSang Kil LeePublished in: Cancers (2022)
DKK1 inhibits the canonical Wnt signaling pathway that is known to be involved in various cancers. However, whether DKK1 acts as an oncogene or tumor suppressor gene remains controversial. Furthermore, the DKK1-regulating mechanism in gastric cancer has not yet been defined. The aim of this study was to explore whether the ultraconserved region UC.145 regulates epigenetic changes in DKK1 expression in gastric cancer. Microarray analysis revealed that UC.145 exhibited the highest binding affinity to EZH2, a histone methyltransferase. The effects of UC.145 inactivation were assessed in gastric cancer cell lines using siRNA. The results indicated that UC.145 triggers DKK1 methylation via interaction with EZH2 and is involved in the canonical Wnt signaling pathway. Additionally, interaction between UC.145 and another long non-coding RNA adjacent to DKK1, PRKG1-AS1, induced a synergistic effect on Wnt signaling. The regulation of these three genes was closely associated with patient overall survival. Inactivation of UC.145 induced apoptosis and inhibited the growth and migratory, invasive, and colony-forming abilities of gastric cancer cells. The study findings provide insights into Wnt signaling in gastric cancer and support UC.145 as a potential novel predictive biomarker for the disease.
Keyphrases
- signaling pathway
- long non coding rna
- induced apoptosis
- poor prognosis
- stem cells
- dna methylation
- pi k akt
- cell proliferation
- genome wide
- endoplasmic reticulum stress
- epithelial mesenchymal transition
- oxidative stress
- gene expression
- case report
- cancer therapy
- diabetic rats
- risk assessment
- climate change
- endothelial cells
- long noncoding rna
- single cell
- drug induced