Galectin-9/TIM-3 as a Key Regulator of Immune Response in Gliomas With Chromosome 1p/19q Codeletion.

Abstract

Gliomas with chromosome 1p/19q codeletion were considered a specific tumor entity. This study was designed to reveal the biological function alterations tightly associated with 1p/19q codeletion in gliomas. Clinicopathological and RNA sequencing data from glioma patients were obtained from The Cancer Genome Atlas and Chinese Glioma Genome Atlas databases. Gene set variation analysis was performed to explore the differences in biological functions between glioma subgroups stratified by 1p/19q codeletion status. The abundance of immune cells in each sample was detected using the CIBERSORT analytical tool. Single-cell sequencing data from public databases were analyzed using the t-distributed stochastic neighbor embedding (t-SNE) algorithm, and the findings were verified by in vitro and in vivo experiments and patient samples.We found that the activation of immune and inflammatory responses was tightly associated with 1p/19q codeletion in gliomas. As the most important transcriptional regulator of Galectin-9 in gliomas, the expression level of CCAAT enhancer-binding protein alpha in samples with 1p/19q codeletion was significantly decreased, which led to the downregulation of the immune checkpoints Galectin-9 and TIM-3. These results were validated in three independent datasets. The t-SNE analysis showed that the loss of chromosome 19q was the main reason for the promotion of the antitumor immune response. IHC protein staining, in vitro and in vivo experiments verified the results of bioinformatics analysis. In gliomas, 1p/19q codeletion can promote the antitumor immune response by downregulating the expression levels of the immune checkpoint TIM-3 and its ligand Galectin-9.

• Authors: Guanzhang Li, Ruoyu Huang, Wenhua Fan, Di Wang, Fan Wu, Fan Zeng, Mingchen Yu, You Zhai, Yuanhao Chang, Changqing Pan, Tao Jiang, Wei Yan, Hongjun Wang, Wei Zhang
• Journal: Frontiers in immunology (Front Immunol) Vol. 12 Pg. 800928 ( 2021) ISSN: 1664-3224 [Electronic] Switzerland
• PMID: 34956239 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2021 Li, Huang, Fan, Wang, Wu, Zeng, Yu, Zhai, Chang, Pan, Jiang, Yan, Wang and Zhang.

Chemical References

• Galectins
• HAVCR2 protein, human
• Hepatitis A Virus Cellular Receptor 2
• LGALS9 protein, human

Topics

• Adult
• Animals
• Brain Neoplasms (genetics, immunology, metabolism)
• Chromosome Deletion
• Chromosomes, Human, Pair 1 (genetics)
• Chromosomes, Human, Pair 19 (genetics)
• Female
• Galectins (immunology, metabolism)
• Gene Expression Regulation, Neoplastic (physiology)
• Glioma (genetics, immunology, metabolism)
• Hepatitis A Virus Cellular Receptor 2 (immunology, metabolism)
• Heterografts
• Humans
• Male
• Mice
• Middle Aged