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Related Experiment Videos

Interference with antigen processing by viruses

H Hengel1, U H Koszinowski

  • 1Max von Pettenkofer-Institut, Lehrstuhl Virologie, Genzentrum, Ludwig Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377, München, Germany. hengel@lmb.uni-muenchen.de

Current Opinion in Immunology
|August 1, 1997
PubMed
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Persistent viruses like herpesviruses and HIV evade immune detection by manipulating the MHC class I pathway. Some viruses even express mimic proteins to hide from immune cells and natural killer cells.

Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • Persistent viruses (e.g., herpesviruses, adenoviruses, HIV) evade host immune responses.
  • A key immune mechanism targeted is the Major Histocompatibility Complex (MHC) class I pathway, crucial for CD8+ T cell recognition.
  • Viral strategies aim to disrupt antigen processing and presentation to avoid T cell-mediated elimination.

Purpose of the Study:

  • To review recent discoveries on viral mechanisms for evading MHC class I-restricted CD8+ T cell surveillance.
  • To elucidate the molecular strategies viruses employ to interfere with antigen processing and presentation.
  • To explore how viral evasion tactics impact infected cell susceptibility to other immune components like natural killer cells.

Main Methods:

  • Review of recent scientific literature and notable discoveries in viral immunology.

Related Experiment Videos

  • Analysis of viral proteins and their functions in manipulating the MHC class I pathway.
  • Examination of the interplay between viral evasion strategies and natural killer cell activity.

    • Main Results:

    • Viruses can target virtually every step of the MHC class I antigen processing and presentation pathway.
    • Viral factors acting as natural inhibitors have revealed specific molecular mechanisms of evasion.
    • Downregulation of MHC class I surface expression can increase susceptibility to natural killer cells.
    • Some viruses express MHC class I homologues to inhibit natural killer cell activity, counteracting increased susceptibility.

    Conclusions:

    • Viruses utilize sophisticated strategies to subvert host antiviral immunity, particularly the MHC class I pathway.
    • Understanding these viral stealth mechanisms is crucial for developing effective antiviral therapies.
    • Viral manipulation of immune recognition pathways presents a complex challenge for host defense.