Contributes to TMZ Resistance, Prognosis, and Immune Infiltration in GBM from a Novel Pyroptosis-Associated Risk Signature

Overview

Journal Dis Markers

Publisher Wiley

Specialty Biochemistry

Date 2022 Apr 11

PMID 35401877

Authors

Lu Liang

Bin Yan

Yueying Liu

Shiyao Jiang

Hua He

Jingjing Huang

Wenbin Liu

Li Xie

Affiliations

Soon will be listed here.

Abstract

Background: Pyroptosis is a form of programmed cell death, playing a significant role in cancer. Glioblastoma multiforme (GBM) is the most common malignant brain tumor. The poor prognosis in GBM due to temozolomide (TMZ) resistance has been widely discussed. Such being the case, the correlation between TMZ resistance and pyroptosis is seldom investigated. On this basis, this paper aims to explore the potential prognostic value of genes related to TMZ resistance and pyroptosis as well as their relationship to the immune microenvironment in GBM.

Methods: A total of 103 patients from TCGA were assigned to a training cohort; 190 from CGGA were assigned to a validation cohort. The prognostic risk model reflecting pyroptosis and TMZ resistance was built from the training cohort using multivariate Cox regression and performed validation. RT-qPCR was used to examine the expression of 4 genes from the risk signature. was selected for overexpression and verified using the western blot. The TMZ IC50 of -overexpressed cell lines was determined by CCK8.

Results: A four genes-based risk signature was established and validated, separating GBM patients into high- and low-risk groups. Compared with the low-risk group, the high-risk group presented worse clinical survival outcomes. Its differential expressed genes were enriched in immune-related pathways and closely related to the immune microenvironment. Moreover, RT-qPCR results suggested that , , and were significantly upregulated in TMZ-resistant strains, while was downregulated. overexpressed GBM cell lines had higher TMZ IC50, implying an increased resistance of TMZ.

Conclusion: A novel gene signature relevant to pyroptosis and TMZ resistance was constructed and could be used for the prognosis of GBM. The four genes from the risk model might play a potential role in antitumor immunity and serve as therapeutic targets for GBM.

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