1
|
Cai J, Xiao L, Liu J, Wang D, Zhou Y, Liao Z, Chen G. BPIFB1, Serving as a Downstream Effector of EBV-miR-BART4, Blocks Immune Escape of Nasopharyngeal Carcinoma via Inhibiting PD-L1 Expression. Biochem Genet 2024:10.1007/s10528-024-10719-3. [PMID: 38467887 DOI: 10.1007/s10528-024-10719-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 01/26/2024] [Indexed: 03/13/2024]
Abstract
Nasopharyngeal carcinoma (NPC) is one of the most common tumors of head and neck in the Southeast Asia. PD-L1-dependent immune escape plays a critical role involved in NPC development. BPIFB1 has previously reported to take tumor-suppressive actions on NPC cell proliferation and migration. Nonetheless, the function of BPIFB1 in immune escape remains largely elusive. Expression pattern on mRNA and protein levels of target genes in NPC patients' samples and cell lines were examined by qRT-PCR, western blot, and immunohistochemistry staining, respectively. The assessment of CD8+ T-cell apoptosis and expression was determined by flow cytometry. Molecular interactions were verified using chromatin immunoprecipitation (ChIP) and luciferase reporter assay. BPIFB1 was downregulated in NPC tumor tissues, exhibiting a negative correlation of PD-L1. Overexpression of BPIFB1 significantly inhibited the expression of PD-L1, suppressing the apoptosis and enhancing the expression of CD8+ T cells. Mechanistically, BPIFB1 was found to repress the expression of STAT1, which was identified to be an upstream activator of PD-L1. Furthermore, the EBV-encoded miR-BART4 overexpressed in NPC cells could directly target and inhibit BPIFB1. This study provided a comprehensive understanding of the molecular mechanism for the upstream and downstream pathway of BPIFB1 related with immune escape, indicating a novel approach for the treatment of NPC.
Collapse
Affiliation(s)
- Jiaodi Cai
- Department of Pathology, The Affiliated Changsha Hospital of Hunan Normal University (The Fourth Hospital of Changsha), No. 70, Lushan South Road, Yuelu District, Changsha, 410006, Hunan, People's Republic of China
| | - Li Xiao
- Department of Pathology, The Affiliated Changsha Hospital of Hunan Normal University (The Fourth Hospital of Changsha), No. 70, Lushan South Road, Yuelu District, Changsha, 410006, Hunan, People's Republic of China
| | - Jiao Liu
- Department of Pathology, The Affiliated Changsha Hospital of Hunan Normal University (The Fourth Hospital of Changsha), No. 70, Lushan South Road, Yuelu District, Changsha, 410006, Hunan, People's Republic of China
| | - Dan Wang
- Cancer Research Institute, Central South University, Changsha, 410006, Hunan, People's Republic of China
| | - Yadong Zhou
- Department of Pathology, The Affiliated Changsha Hospital of Hunan Normal University (The Fourth Hospital of Changsha), No. 70, Lushan South Road, Yuelu District, Changsha, 410006, Hunan, People's Republic of China
| | - Zhiming Liao
- Department of Pathology, The Affiliated Changsha Hospital of Hunan Normal University (The Fourth Hospital of Changsha), No. 70, Lushan South Road, Yuelu District, Changsha, 410006, Hunan, People's Republic of China
| | - Guoqun Chen
- Department of Pathology, The Affiliated Changsha Hospital of Hunan Normal University (The Fourth Hospital of Changsha), No. 70, Lushan South Road, Yuelu District, Changsha, 410006, Hunan, People's Republic of China.
| |
Collapse
|