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Updated: Sep 25, 2025
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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
Published on: March 2, 2014
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Porcine Reproductive and Respiratory Syndrome Virus Adapts Antiviral Innate Immunity via Manipulating MALT1
Han Gu1,2, Suya Zheng1,2, Guangwei Han1,2
1Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou, China.
Mbio
|April 25, 2022
Summary
Porcine reproductive and respiratory syndrome virus (PRRSV) manipulates MALT1 to degrade antiviral RNases, facilitating replication. PRRSV also downregulates MALT1 to suppress inflammation, aiding virus survival and immune homeostasis.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Porcine reproductive and respiratory syndrome virus (PRRSV) is a significant swine pathogen that suppresses innate immunity.
- MALT1 is a key regulator of both innate and adaptive immune responses.
- Understanding viral immune evasion strategies is crucial for controlling PRRSV infections.
Purpose of the Study:
- To investigate the role of MALT1 in PRRSV infection.
- To elucidate the mechanisms by which PRRSV manipulates MALT1 expression and function.
- To understand how MALT1 modulation by PRRSV impacts antiviral immunity and viral replication.
Main Methods:
- PRRSV infection of host cells.
- Analysis of MALT1 expression levels and localization.
- Assessment of MALT1 proteolytic activity.
- Identification of PRRSV proteins involved in MALT1 induction and degradation.
- Investigation of the ubiquitination-proteasome pathway in MALT1 regulation.
- Measurement of antiviral RNase activity and inflammatory cytokine production.
Main Results:
- PRRSV infection rapidly induces MALT1 expression.
- MALT1's proteolytic activity degrades anti-PRRSV RNases MCPIP1 and N4BP1, promoting viral replication.
- Multiple PRRSV non-structural proteins (nsps) contribute to MALT1 induction.
- PRRSV nsp6 mediates MALT1 degradation via the ubiquitination-proteasome pathway.
- Downregulation of MALT1 suppresses NF-κB signaling and reduces pro-inflammatory cytokine expression.
- MALT1 expression levels are inversely correlated with viral load, with higher viral loads leading to MALT1 downregulation.
Conclusions:
- PRRSV employs a sophisticated strategy to manipulate MALT1 expression for its benefit.
- MALT1 induction facilitates viral replication by antagonizing antiviral RNases.
- MALT1 degradation by PRRSV nsp6 suppresses inflammatory responses, contributing to immune evasion and virus survival.
- These findings reveal a novel mechanism of PRRSV immune adaptation through precise control of MALT1 expression to establish viral homeostasis.
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