Abstract
In recent years, breakthroughs in the field of tumor immunotherapy with immune checkpoint inhibitors (ICIs) have made a therapeutic revolution, which has been shown to improve the prognosis of patients with hepatocellular carcinoma (HCC). Immune infiltrates represent a major component of tumor microenvironment (TME), and play an essential role in both tumor progression and therapeutic response. The major unmet challenge in tumor immunotherapy is exploring the intrinsic and extrinsic mechanisms of TME promoting the management of HCC. Lysyl oxidase like 3 (LOXL3) participates in the remodeling of extracellular matrix (ECM) and the cross-linking of collagen and elastic fibers. It has been reported that LOXL3 is associated with the development and tumorigenesis of multiple types of cancer. RNA sequencing data and corresponding clinical information were extracted from The Cancer Genome Atlas (TCGA) databases, then subjected to gene expression, tumor microenvironment, survival, enrichment analyses utilizing R packages. In this study, we first found that LOXL3 gene was upregulated in tumor tissues compared with the normal tissues. Furthermore, LOXL3 expression is positively correlated with the infiltration of multiple immune cells and the expression of immune checkpoint genes in HCC. Meanwhile, high LOXL3 expression predicted poor outcomes of the patients with HCC. Functional enrichment analysis suggested that LOXL3 was mainly linked to extracellular structure and matrix organization, cell−cell adhesion, and T cell activation. This is the first comprehensive study to indicate that LOXL3 is correlated with immune infiltrates and may serve as a novel biomarker predicting prognosis and immunotherapy in HCC.
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Data availability
All data is available under reasonable request.
Abbreviations
- CAMs:
-
cell adhesion molecules
- CCLE:
-
cancer cell line encyclopedia
- CI:
-
confidence interval
- DEGs:
-
differentially expressed genes
- DSS:
-
disease-specific survival
- ECM:
-
extracellular matrix
- FC:
-
fold change
- FDR:
-
false discovery rate
- GEPIA:
-
gene expression profiling interactive analysis
- GO:
-
Gene Ontology
- GTEx:
-
genotype-tissue expression
- HBV:
-
hepatitis B virus
- HCC:
-
hepatocellular carcinoma
- HCV:
-
hepatitis C virus
- HR:
-
hazard ratio
- ICB:
-
immune checkpoint blockade
- ICIs:
-
immune checkpoint inhibitors
- IHC:
-
immunohistochemistry
- KEGG:
-
Kyoto encyclopedia of genes and genomes
- LOX:
-
lysyl oxidase
- LOXL3:
-
lysyl oxidase like 3
- MMRs:
-
mismatch repair system
- NAFLD:
-
nonalcoholic fatty liver disease
- NCCN:
-
national comprehensive cancer network
- OS:
-
overall survival
- PD-1:
-
programmed death receptor 1
- PD-L1:
-
programmed death receptor ligand 1
- PPI:
-
protein–protein interaction
- TACE:
-
transarterial chemoembolization
- TCGA:
-
the cancer genome atlas
- THPA:
-
the human protein atlas
- TIMER:
-
tumor immune estimation resource
- TME:
-
tumor microenvironment
- VEGF:
-
vascular endothelial growth factor
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Acknowledgements
We acknowledge the TCGA, GTEx, CCLE, THPA, TIMER, TISIDB, GEPIA, and STRING databases for free use. Additionally, Ning Wang would like to thank his parents and wife for their encouragement and support in the scientific research work.
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Ning Wang and Xue Zhou contributed to the study conception, design, and visualization. Fei Tang and XiaoWei Zhu performed data analysis and figure generation. Xue Wang contributed to collection and integration of data. Ning Wang wrote the manuscript.
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Supplementary Information
Fig. S1
Identification of LOXL3 expression is in pan-cancer. a The expression of LOXL3 in 31 normal tissues based on GTEx database. b The expression of LOXL3 in 21 tumor cells based on CCLE database (PNG 613 kb)
Fig. S2
Correlation analysis of LOXL3 expression with the mutation levels of five MMR genes involving in MLH1, MSH2, MSH6, PMS2, and EPCAM in pan-cancer. *P < 0.05, **P < 0.01, and ***P < 0.001 (PNG 201 kb)
Fig. S3
Correlation analysis of LOXL3 expression with four DNA methyltransferase genes (DNMT1, red; DNMT2, blue; DNMT3A, green; DNMT3B, purple) in pan-cancer (PNG 1159 kb)
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Wang, N., Zhou, X., Tang, F. et al. Identification of LOXL3-associating immune infiltration landscape and prognostic value in hepatocellular carcinoma. Virchows Arch 479, 1153–1165 (2021). https://doi.org/10.1007/s00428-021-03193-4
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DOI: https://doi.org/10.1007/s00428-021-03193-4