Transcription factor MYB regulates glycolysis to promote the transfer and malignant progression of gastric cancer through the SSBP2/ISL1 axis.

BACKGROUND: The transcription factor (TF) MYB is crucial to many biological processes. Single-stranded DNA binding protein 2 (SSBP2), insulin gene enhancer protein 1 (ISL1) and glycolysis participated in the development of gastric cancer (GC). This study aims to explore the regulatory mechanism of the MYB/SSBP2/ISL1 axis in the development of GC. METHODS: The dataset GSE65801 of cancer tissue and paracancerous tissue samples from patients with GC was used to screen differential genes, identify GC-related key TFs and the target gene of TFs, and perform expression and survival correlation analysis. Subsequently, the expression was verified in GC tissues and cells by RT-qPCR, IHC and Western blot. CCK-8, cloning, Transwell, wound healing assay, flow cytometry and Kits testing detected the effects on cells. EMSA, Yeast one-hybrid, dual-luciferase assays, ChIP-seq analysis and ChIP-PCR analysis were used to verify transcription factor binding, and pull-down assay, CO-IP, and immunofluorescence (IF) were employed to confirm interaction. MYB action was further assessed by subcutaneous tumour experiments in nude mice. RESULTS: MYB is the key differential expression TF in GC, and SSBP2 is a key target gene of MYB. MYB had a higher expression, but SSBP2 had a lower expression in GC patients' gastric cancer tissue. SSBP2 is a direct target of MYB in GC cells. SSBP2 was transcriptionally repressed by MYB. SSBP2 further negatively regulates ISL1 expression. MYB knockdown inhibited glycolysis, proliferation, invasion, and migration abilities in GC cells both in vivo and in vitro, but it was also reversed by SSBP2 knockdown. SSBP2 overexpression inhibits glycolysis, cell proliferation, invasion and migration abilities in GC cells, but it was reversed by ISL1 overexpression. CONCLUSION: MYB mediates glycolysis and malignant progression in GC cells through regulation of the SSBP2/ISL1 axis.