Journal of Oral Science Research ›› 2023, Vol. 39 ›› Issue (8): 684-689.DOI: 10.13701/j.cnki.kqyxyj.2023.08.005

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Barx2 Drives Tumor-specific MHC-Ⅱ Signaling to Induce CD4+T/CD8+T Cell Activation in Oral Squamous Cell Carcinoma

LI Yiwei, SUN Yanan, PAN Junchen, HU Yaying, ZHANG Yuying, MA Jiyuan, ZHANG Jiali*   

  1. State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, Department of Oral Pathology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China
  • Received:2023-01-12 Published:2023-08-17

Abstract: Objective: To explore the mechanism of BarH-like homeobox 2 (Barx2) killing tumor cells by promoting MHC Class Ⅱ molecules. Methods: The expression levels of CⅡTA/MHC-Ⅱ related molecules in Barx2 overexpressed OSCC cell lines were analyzed by high-throughput sequencing, qPCR, and Western Blot. The combination of Barx2 and CⅡTA pⅢ promoter was verified by double luciferase assay. Human peripheral blood mononuclear cells (PBMC) were extracted and co-cultured with tumor cells in the control group and Barx2 overexpression group, and the number of tumor cells was detected by crystal violet staining. The proliferation activity of CD4+T cells and CD8+T cells in PBMC was analyzed by flow cytometry after labeling PBMC with CFSE. Results: High-throughput transcriptome sequencing results combined with GSEA gene set enrichment analysis and KEGG signaling pathway analysis showed that overexpression of Barx2 enhanced the up-regulation of factors related to antigen processing and presentation pathway and MHC-Ⅱ signaling molecules. In Barx2 overexpressed cell lines, qPCR and Western blot further confirmed the significant upregulation of the above genes. Barx2 could directly bind upstream to CⅡTA pⅢ promoter. After co-culture with PBMC, the number of tumor cells overexpressing Barx2 was significantly less than that in the control group. Overexpression of Barx2 tumor cells promoted the proliferation of CD4+T and CD8+T cells. Conclusion: Barx2 can drive the activation of CⅡTA/MHC-Ⅱ signal axis, induce the expression of HLA-DR-dominated MHC-Ⅱ class molecules in tumor cells, and further activate CD4+T and CD8+T cells to play a role in killing tumor cells.

Key words: BarH-like homeobox 2, MHC-Ⅱ, oral squamous cell carcinoma, immunity to tumors