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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
Published on: March 2, 2014
The race between viral immune evasion and the MHC class I antigen processing pathway
Yu Ye1,2, Ying Zhang1,2, Haobing Nie1,2
1College of Animal Science and Technology, Jiangxi Provincial Engineering Technology Center for Animal Disease Prevention and Control Agents, Institute of Animal Disease Prevention and Control, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China.
Abstract:
Viral immune evasion of the major histocompatibility complex class I (MHC-I) antigen processing and presentation (APP) pathway is a centerpiece of the art of deception that enables persistence, reinfection, and severe disease. It does so by blunting peptide-MHC-I (pMHC-I) display, weakening CD8+ cytotoxic T lymphocyte (CTL) surveillance, and balancing the counterpressure imposed by natural killer (NK) cell missing-self responses. Rather than relying on a single trick, viruses deploy coordinated, multinode interference that functionally rewires the APP assembly line. These deceptive strategies include limiting antigen substrate availability, reshaping proteasomal peptide generation, sabotaging transporters associated with antigen processing (TAP)-dependent peptide import, disrupting peptide-loading complex-assisted editing, misdirecting MHC-I trafficking, and accelerating surface pMHC-I degradation. In parallel, many viruses fine-tune immune visibility through allele-selective modulation and nonclassical MHC circuits such as human leukocyte antigen E (HLA-E), thereby optimizing CTL evasion without inducing overwhelming NK activation. This review, therefore, describes the development of pathway-centered mechanistic synthesis across DNA and RNA virus families. We further integrate innate immune antagonism, endoplasmic reticulum stress, antigen-presentation competence, cross-presentation limits, and virus-shaped peptide landscapes into a unified framework for understanding viral control of MHC-I output and its translational implications.
Insights
Viruses evade immune surveillance by manipulating the major histocompatibility complex class I (MHC-I) antigen processing and presentation (APP) pathway. This review synthesizes viral strategies to disrupt APP, enabling pathogen persistence and disease.
Area of Science:
- Immunology
- Virology
- Molecular Biology
Background:
- Viral immune evasion is critical for pathogen persistence and disease severity.
- Major Histocompatibility Complex class I (MHC-I) antigen processing and presentation (APP) is a key target for viral immune evasion.
- Viruses disrupt MHC-I pathways to evade CD8+ cytotoxic T lymphocyte (CTL) surveillance while balancing natural killer (NK) cell responses.
Purpose of the Study:
- To review and synthesize the diverse mechanisms viruses use to interfere with the MHC-I APP pathway.
- To integrate innate immune antagonism and endoplasmic reticulum stress into a framework for understanding viral control of MHC-I.
- To explore the translational implications of viral manipulation of antigen presentation.
Main Methods:
- Literature review and synthesis of mechanistic insights across DNA and RNA virus families.
- Integration of data on viral strategies affecting antigen substrate availability, proteasomal peptide generation, TAP-dependent peptide import, and peptide loading.
- Analysis of viral modulation of MHC-I trafficking, surface degradation, allele-selective presentation, and nonclassical MHC circuits like HLA-E.
Main Results:
- Viruses employ coordinated, multi-node interference to functionally rewire the MHC-I APP pathway.
- Viral strategies include limiting antigen substrates, altering peptide generation, disrupting TAP function, and interfering with peptide loading.
- Viruses modulate MHC-I presentation to evade CTLs without triggering excessive NK cell activation, fine-tuning immune visibility.
Conclusions:
- Understanding viral manipulation of the MHC-I APP pathway provides a unified framework for viral immune evasion.
- Viral strategies are diverse and target multiple steps in antigen processing and presentation.
- This mechanistic synthesis has significant translational implications for developing antiviral therapies and improving immune surveillance.
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