Identification and Mechanism of the PD-1/PD-L1 Genomic Signature SORL1 as Protective Factor in Bladder Cancer

Yajing Xu; Didi Chen; Lanxiao Shen; Xiaowei Huang; Yi Chen; Huafang Su

doi:10.3389/fgene.2021.736158

Identification and Mechanism of the PD-1/PD-L1 Genomic Signature SORL1 as Protective Factor in Bladder Cancer

Front Genet. 2021 Dec 16:12:736158. doi: 10.3389/fgene.2021.736158. eCollection 2021.

Authors

Yajing Xu¹, Didi Chen¹, Lanxiao Shen², Xiaowei Huang¹, Yi Chen^{3

4}, Huafang Su¹

Affiliations

¹ Department of Radiation Oncology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.
² Department of Radiotherapy Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.
³ Department of Oncology-Pathology, Karolinska Institutet, Solna, Sweden.
⁴ Clinical Pathology and Cancer Diagnostics, Karolinska University Hospital, Solna, Sweden.

Abstract

Background: Immunotherapy has recently shown remarkable efficacy for advanced bladder cancer patients. Accordingly, identifying a biomarker associated with the programmed cell death protein 1 (PD-1)/its ligand (PD-L1) genomic signature to predict patient prognosis is necessary. Methods: In this study, we used mutation data and RNA-seq data of bladder cancer samples acquired from The Cancer Genome Atlas (TCGA) database to combine PD-1/PD-L1-associated mutational signatures with PD-1/PD-L1-associated differentially expressed genes (DEGs). Then, we performed a Kaplan-Meier analysis on the corresponding clinical data of the TCGA bladder urothelial carcinoma (BLCA) cohort to identify prognostic genes, and the results were validated using the GSE48075 cohort. The online platform UCSC Xena was used to analyze the relationship between the candidate genes and clinical parameters. We utilized the Human Protein Atlas (HPA) database to validate the protein expression levels. Then, correlation analysis, cell-type identification by estimating relative subsets of RNA transcripts (CIBERSORT) analysis, and gene set enrichment analysis (GSEA) were used to clarify the mechanism. Results: We identified one prognostic gene, sortilin related receptor 1 (SORL1), whose downregulation was associated with a comparatively advanced BLCA stage. While further exploring this finding, we found that SORL1 expression was negatively correlated with PD-1/PD-L1 expression and M2 macrophage levels. Furthermore, we found that the downregulation of SORL1 expression was significantly associated with a higher epithelial-mesenchymal transition (EMT) score. Conclusion: We described a novel PD-1/PD-L1-associated signature, SORL1, that predicts favorable outcomes in bladder cancer. SORL1 might reduce immune suppression and inhibit the M2 macrophage-induced EMT phenotype of tumor cells.

Keywords: EMT; M2 macrophage; PD-L1; SORL1; TCGA; bladder cancer.