Glioblastoma (GBM)
is the most devastating and frequent type of
primary brain tumor with high morbidity and mortality. Despite the
use of surgical resection followed by radio- and chemotherapy as standard
therapy, the progression of GBM remains dismal with a median overall
survival of <15 months. GBM embodies a populace of cancer stem
cells (GSCs) that is associated with tumor initiation, invasion, therapeutic
resistance, and post-treatment reoccurrence. However, understanding
the potential mechanisms of stemness and their candidate biomarkers
remains limited. Hence in this investigation, we aimed to illuminate
potential candidate hub genes and key pathways associated with the
pathogenesis of GSC in the development of GBM. The integrated analysis
discovered differentially expressed genes (DEGs) between the brain
cancer tissues (GBM and GSC) and normal brain tissues. Multiple approaches,
including gene ontology (GO) analysis and Kyoto Encyclopedia of Genes
and Genomes (KEGG) pathway analysis, were employed to functionally
annotate the DEGs and visualize them through the R program. The significant
hub genes were identified through the protein–protein interaction
network, Venn diagram analysis, and survival analysis. We observed
that the upregulated DEGs were prominently involved in the ECM–receptor
interaction pathway. The downregulated genes were mainly associated
with the axon guidance pathway. Five significant hub genes (CTNNB1,
ITGB1, TNC, EGFR, and SHOX2) were screened out through multiple analyses.
GO and KEGG analyses of hub genes uncovered that these genes were
primarily enriched in disease-associated pathways such as the inhibition
of apoptosis and the DNA damage repair mechanism, activation of the
cell cycle, EMT (epithelial–mesenchymal transition), hormone
AR (androgen receptor), hormone ER (estrogen receptor), PI3K/AKT (phosphatidylinositol
3-kinase and AKT), RTK (receptor tyrosine kinase), and TSC/mTOR (tuberous
sclerosis complex and mammalian target of rapamycin). Consequently,
the epigenetic regulatory network disclosed that hub genes played
a vital role in the progression of GBM. Finally, candidate drugs were
predicted that can be used as possible drugs to treat GBM patients.
Overall, our investigation offered five hub genes (CTNNB1, ITGB1,
TNC, EGFR, and SHOX2) that could be used as precise diagnostic and
prognostic candidate biomarkers of GBM and might be used as personalized
therapeutic targets to obstruct gliomagenesis.