Related Experiment Video
Updated: Mar 2, 2026
Peptide:MHC Tetramer-based Enrichment of Epitope-specific T cells
Published on: October 22, 2012
Unveiling the epitope repertoires and protective roles of MERS-CoV-specific T cells in mice
Zhen Zhuang1, Jiaying Luo1, Guoxian Zhang2
1State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, National Center for Respiratory Medicine, Joint International Research Laboratory of Respiratory Health, Guangdong Basic Research Center of Excellence for Respiratory Medicine, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510182, China.
Abstract:
Since its initial emergence in 2012, MERS-CoV has remained endemic and a global health threat. While accessory proteins (ORFs) are known for immune evasion, their role in adaptive immunity is unexplored. This study systematically investigated T cell responses against MERS-CoV ORFs. We mapped epitope repertoires targeting structural proteins and ORFs in C57BL/6 and BALB/c mice, revealing that ORFs potently induced virus-specific T cells. Notably, ORF5 induced the dominant CD8+ T cell responses in BALB/c mice. Further analysis revealed that ORF4b208-specific CD4+ and ORF5167-specific CD8+ T cells in the respiratory tract exhibited polyfunctional cytokine profiles, high antigen sensitivity, and potent in vivo cytotoxicity. These specific T cells played protective roles during MERS-CoV infection by promoting viral clearance. Collectively, this study identified MERS-CoV-specific T cell epitopes and elucidated the roles of ORF4b- and ORF5-specific T cells, enhancing our understanding of anti-MERS-CoV T cell responses and advancing vaccine design strategies against MERS-CoV.
Insights
This study reveals that MERS-CoV accessory proteins (ORFs) effectively trigger T cell responses. Specific T cells targeting ORF4b and ORF5 are crucial for clearing the virus and may enhance MERS-CoV vaccine design.
Area of Science:
- Immunology
- Virology
- Infectious Diseases
Background:
- Middle East Respiratory Syndrome Coronavirus (MERS-CoV) is an ongoing global health concern.
- The role of MERS-CoV accessory proteins (ORFs) in adaptive immunity, particularly T cell responses, remains largely uncharacterized.
- Understanding T cell immunity is critical for developing effective vaccines and treatments.
Purpose of the Study:
- To systematically investigate T cell responses against MERS-CoV accessory proteins (ORFs).
- To identify and characterize T cell epitopes within MERS-CoV ORFs.
- To elucidate the protective functions of ORF-specific T cells during MERS-CoV infection.
Main Methods:
- Epitope mapping of T cell responses against MERS-CoV structural proteins and ORFs in mouse models (C57BL/6 and BALB/c).
- Analysis of CD4+ and CD8+ T cell responses, including cytokine profiles, antigen sensitivity, and cytotoxicity.
- Assessment of the in vivo protective roles of identified T cells during MERS-CoV infection.
Main Results:
- MERS-CoV ORFs were found to potently induce virus-specific T cells.
- ORF5 elicited dominant CD8+ T cell responses in BALB/c mice.
- Specific CD4+ (ORF4b) and CD8+ (ORF5) T cells in the respiratory tract demonstrated polyfunctionality, high sensitivity, and cytotoxicity.
- These T cells contributed to viral clearance and protection during MERS-CoV infection.
Conclusions:
- This study identifies key MERS-CoV-specific T cell epitopes within accessory proteins.
- ORF4b- and ORF5-specific T cells play significant roles in anti-MERS-CoV adaptive immunity.
- Findings advance the understanding of T cell-mediated immunity against MERS-CoV and inform future vaccine development strategies.
Related Concept Videos
01:26Antigens Involved in Adaptive Immunity
Complete Antigens
Complete antigens possess both immunogenicity and...
00:42Cross-reactivity