Early Highly Pathogenic Porcine Reproductive and Respiratory Syndrome Virus Infection Induces Necroptosis in Immune Cells of Peripheral Lymphoid Organs.

Jiawei Xu, Caiyun Huo, Yaling Yang, Jun Han, Lei Zhou, Yanxin Hu, Hanchun Yang
Author Information
  1. Jiawei Xu: Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, National Key Laboratory of Veterinary Public Health and Safety, College of Veterinary Medicine, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China.
  2. Caiyun Huo: Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, National Key Laboratory of Veterinary Public Health and Safety, College of Veterinary Medicine, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China.
  3. Yaling Yang: Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, National Key Laboratory of Veterinary Public Health and Safety, College of Veterinary Medicine, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China.
  4. Jun Han: Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, National Key Laboratory of Veterinary Public Health and Safety, College of Veterinary Medicine, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China. ORCID
  5. Lei Zhou: Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, National Key Laboratory of Veterinary Public Health and Safety, College of Veterinary Medicine, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China. ORCID
  6. Yanxin Hu: Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, National Key Laboratory of Veterinary Public Health and Safety, College of Veterinary Medicine, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China. ORCID
  7. Hanchun Yang: Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, National Key Laboratory of Veterinary Public Health and Safety, College of Veterinary Medicine, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China. ORCID

Abstract

The highly pathogenic porcine reproductive and respiratory syndrome virus (HP-PRRSV) has caused huge economic losses to the pig industry in China. This study evaluated the damage to peripheral immune tissues in the early infection of HP-PRRSV, including the hilar lymph nodes, mandibulares lymph nodes, inguinales superficials lymph nodes, spleens, and tonsils. HP-PRRSV infection led to a reduction in CD4 and CD8 T cells, as well as CD19 B cells, in the tonsils. Additionally, CD163 macrophages and CD56 NK cells increased in all peripheral lymphoid organs, with NK cells migrating toward the lymphoid follicles. However, no significant changes were observed in CD11c dendritic cells. RNA-seq analysis showed the down-regulation of T and B cell functions, while macrophage and NK cell functions were enhanced. Gene Ontology (GO) and KEGG pathway analysis indicated the up-regulation of necroptosis processes. Western blotting and immunofluorescence confirmed that HP-PRRSV induced PKR-mediated necroptosis in immunocytes. This study provides new insights into the effects of early HP-PRRSV infection on peripheral immune organs, highlighting dynamic shifts in immune cell populations, virus-induced immunosuppression, and the role of PKR-mediated necroptosis. These findings improve our understanding of the immunomodulation induced by PRRSV infection.

Keywords

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Grants

  1. 32372966/National Natural Science Foundation of China
  2. 32330106/National Natural Science Foundation of China
  3. CARS-35/China Agriculture Research System of MOF and MARA

MeSH Term

Animals
Porcine respiratory and reproductive syndrome virus
Swine
Porcine Reproductive and Respiratory Syndrome
Necroptosis
Lymphoid Tissue
Killer Cells, Natural
Macrophages
Lymph Nodes
B-Lymphocytes
Spleen
Palatine Tonsil

Word Cloud

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