Complex interactions between the major and minor envelope proteins of equine arteritis virus determine its tropism for equine CD3+ T lymphocytes and CD14+ monocytes.
Abstract: Extensive cell culture passage of the virulent Bucyrus (VB) strain of equine arteritis virus (EAV) to produce the modified live virus (MLV) vaccine strain has altered its tropism for equine CD3(+) T lymphocytes and CD14(+) monocytes. The VB strain primarily infects CD14(+) monocytes and a small subpopulation of CD3(+) T lymphocytes (predominantly CD4(+) T lymphocytes), as determined by dual-color flow cytometry. In contrast, the MLV vaccine strain has a significantly reduced ability to infect CD14(+) monocytes and has lost its capability to infect CD3(+) T lymphocytes. Using a panel of five recombinant chimeric viruses, we demonstrated that interactions among the GP2, GP3, GP4, GP5, and M envelope proteins play a major role in determining the CD14(+) monocyte tropism while the tropism for CD3(+) T lymphocytes is determined by the GP2, GP4, GP5, and M envelope proteins but not the GP3 protein. The data clearly suggest that there are intricate interactions among these envelope proteins that affect the binding of EAV to different cell receptors on CD3(+) T lymphocytes and CD14(+) monocytes. This study shows, for the first time, that CD3(+) T lymphocytes may play an important role in the pathogenesis of equine viral arteritis when horses are infected with the virulent strains of EAV.
Publication Date: 2010-03-10 PubMed ID: 20219931PubMed Central: PMC2863813DOI: 10.1128/JVI.02743-09Google Scholar: Lookup
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Summary
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This research paper studies how different strains of Equine Arteritis Virus (EAV) interact with immune cells in horses. Research findings reveal that complex interplays amongst different viral protein envelopes affect the virus’s ability to infect certain types of immune cells.
Background of the study
- The study builds on a broader understanding of Equine Arteritis Virus (EAV), specifically studying the Bucyrus (VB) strain and its modified live virus (MLV) vaccine strain.
- EAV is known to primarily infect CD14(+) monocytes and certain T lymphocytes in horses.
- The researchers aim to understand how various envelope proteins of the virus influence its ability to bind to and infect these immune cells.
Different abilities of VB and MLV strains to infect immune cells
- The VB strain of EAV mainly infects CD14(+) monocytes and a subpopulation of CD3(+) T lymphocytes (mainly CD4(+) T lymphocytes).
- In contrast, the MLV vaccine strain shows a reduced ability to infect CD14(+) monocytes and appears incapable of infecting CD3(+) T lymphocytes.
Role of envelope proteins in determining cellular tropism
- The study uses five recombinant chimeric viruses to demonstrate the influence of the GP2, GP3, GP4, GP5, and M envelope proteins on the infection ability.
- The particular tropism towards CD14(+) monocytes is determined by interactions among all five envelope proteins mentioned.
- On the other hand, the tropism for CD3(+) T lymphocytes is driven by the GP2, GP4, GP5, and M envelope proteins, excluding GP3.
Impact of complex interactions of envelope proteins on infection ability
- The detailed findings show that the combined interplay among these envelope proteins is vital in affecting EAV’s binding to different cell receptors on CD3(+) T lymphocytes and CD14(+) monocytes.
- This is the first study to suggest that CD3(+) T lymphocytes play a significant role in the progression of equine viral arteritis, particularly when horses are infected with virulent strains of EAV.
Cite This Article
APA
Go YY, Zhang J, Timoney PJ, Cook RF, Horohov DW, Balasuriya UB.
(2010).
Complex interactions between the major and minor envelope proteins of equine arteritis virus determine its tropism for equine CD3+ T lymphocytes and CD14+ monocytes.
J Virol, 84(10), 4898-4911.
https://doi.org/10.1128/JVI.02743-09 Publication
Researcher Affiliations
- 108 Maxwell H. Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington, KY 40546-0099, USA.
MeSH Terms
- Animals
- CD3 Complex / analysis
- Cells, Cultured
- Endothelial Cells / virology
- Equartevirus / physiology
- Horses
- Lipopolysaccharide Receptors / analysis
- Monocytes / chemistry
- Monocytes / virology
- Protein Interaction Mapping
- T-Lymphocytes / chemistry
- T-Lymphocytes / virology
- Viral Envelope Proteins / metabolism
- Viral Tropism
- Virus Attachment
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