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Related Concept Videos

Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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EBV Infection Alters NK Cell Phenotype Distinctly From hCMV.

Maria O Ustiuzhanina1,2,3, Julia D Vavilova1, Maria A Salnikova1,2,4

  • 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Moscow, Russia.

Journal of Medical Virology
|September 26, 2025
PubMed
Summary
This summary is machine-generated.

Natural killer (NK) cells show distinct responses to human cytomegalovirus (hCMV) and Epstein-Barr virus (EBV). hCMV drives NKG2C+ NK cell expansion, while EBV promotes terminally differentiated NK cells and influences KIR-HLA interactions.

Keywords:
EBVHLAKIRNK cellsNKG2antiviral immunityhCMV

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Area of Science:

  • Immunology
  • Virology
  • Cellular Biology

Background:

  • Natural killer (NK) cells are crucial for antiviral immunity, utilizing receptors like NKG2 and KIR to interact with HLA-I molecules.
  • While NK cell adaptation to human cytomegalovirus (hCMV) is known, their response to Epstein-Barr virus (EBV) and the role of KIR-HLA combinations in healthy carriers are less understood.

Purpose of the Study:

  • To investigate the differential impact of hCMV and EBV infections on NK cell subsets and their receptor expression in healthy adults.
  • To explore the association between specific KIR-HLA combinations and NK cell responses to hCMV and EBV.

Main Methods:

  • High-resolution HLA genotyping was performed on 85 healthy adult donors.
  • Phenotypic profiling of NK cell subsets and serological testing for hCMV and EBV-specific IgG were conducted.
  • Statistical analyses were used to correlate NK cell subset frequencies and receptor expression with viral IgG titers and HLA-KIR genotypes.

Main Results:

  • hCMV-seropositive individuals showed expansions of NKG2C+ and HLA-DR+ NK cells, correlating with hCMV-IgG titers.
  • EBV infection was linked to increased frequencies of terminally differentiated CD56dim, NKG2A-, CD57+ NK cells and elevated inhibitory KIR expression.
  • EBV-IgG titers correlated with CD57 and KIR2DS4 levels, and carriage of HLA-C2 alleles in KIR2DS4+ donors was associated with higher EBV-IgGs.

Conclusions:

  • hCMV and EBV infections induce distinct NK cell adaptive responses.
  • The interplay between HLA class I and KIR molecules significantly shapes NK cell immunity against EBV in healthy individuals.