Recent studies have defined vaccinia virus (VACV)-specific CD8(+) T cell epitopes in mice and humans. However, little is known about the epitope specificities of CD4(+) T cell responses. In this study, we identified 14 I-A(b)-restricted VACV-specific CD4(+) T cell epitopes by screening a large set of 2146 different 15-mer peptides in C57BL/6 mice. These epitopes account for approximately 20% of the total anti-VACV CD4(+) T cell response and are derived from 13 different viral proteins. Surprisingly, none of the CD4(+) T cell epitopes identified was derived from VACV virulence factors. Although early Ags were recognized, late Ags predominated as CD4(+) T cell targets. These results are in contrast to what was previously found in CD8(+) T cells responses, where early Ags, including virulence factors, were prominently recognized. Taken together, these results highlight fundamental differences in immunodominance of CD4(+) and CD8(+) T cell responses to a complex pathogen.
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http://dx.doi.org/10.4049/jimmunol.178.11.6814 | DOI Listing |
Front Vet Sci
November 2024
Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States.
Sjogren's disease, well-described in people, is rarely identified in veterinary species. In people, Sjogren's disease is one of the most common systemic autoimmune disorders with an incidence of 0.5% in the female population.
View Article and Find Full Text PDFDiabetic cardiomyopathy (DCM) is a leading cause of death in diabetic patients. Current therapies do not adequately resolve this problem and focus only on the optimal level of blood glucose for patients. Ferroptosis plays an important role in diabetes mellitus and cardiovascular diseases.
View Article and Find Full Text PDFJ Dent Res
December 2024
Department of Immunology and Molecular Microbiology in Dental Science, Seoul National University School of Dentistry, Seoul, Republic of Korea.
Oral lichen planus (OLP) is a chronic T cell-mediated inflammatory mucosal disease of unknown etiology. The lack of suitable animal models has hampered understanding of its etiopathogenesis. This study aimed to clarify the contribution of bacterial infection and zinc deficiency (ZD) in OLP pathogenesis by developing a murine model.
View Article and Find Full Text PDFArthritis Rheumatol
December 2024
Department of Medicine, University of Cambridge, Cambridge University Hospitals NHS FT, Cambridge, U.K.
Objective: Genetic associations and blockade of the interleukin-23/IL-17 axis with monoclonal antibodies support a role for this pathway in psoriatic arthritis (PsA). This study examines the requirement of IL-23 for IL-17 production, and the role of the metabolic microenvironment in the expansion of Th-derived cells in PsA.
Methods: PsA patient synovial fluid or peripheral blood Th cell frequencies were evaluated by flow cytometry using CCR6, CD161 and T-bet as phenotypic markers, and the cytokines IFN-γ, GM-CSF and IL-17 assessed by flow cytometry and ELISA.
Immunology
December 2024
Department of Molecular and Medical Pharmacology, UCLA, Los Angeles, California, USA.
Autoreactive, aberrantly activated lymphocytes that target myelin antigens in the central nervous system (CNS) are primary drivers of the autoimmune disease multiple sclerosis (MS). Proliferating cells including activated lymphocytes require deoxyribonucleoside triphosphates (dNTPs) for DNA replication. dNTPs can be synthesised via the de novo pathway from precursors such as glucose and amino acids or the deoxyribonucleoside salvage pathway from extracellular deoxyribonucleosides.
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