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Related Experiment Video

Updated: Dec 5, 2025

Differentiation of the SH-SY5Y Human Neuroblastoma Cell Line
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Herpes simplex encephalitis: pathogenesis and genetic susceptibility.

Flore Rozenberg1

  • 1Hôpital Cochin, Pôle biologie pharmacie pathologie, Service de virologie, bâtiment Jean-Dausset, 27, rue du Faubourg-Saint-Jacques 75679 Paris cedex 14, France.

Virologie (Montrouge, France)
|October 17, 2020
PubMed
Summary
This summary is machine-generated.

Genetic defects in interferon production increase susceptibility to herpes simplex encephalitis (HSE). The Toll-like Receptor 3 (TLR3) pathway is crucial for central nervous system protection against herpes simplex virus (HSV) infection.

Keywords:
Herpes simplex virusTLR3encephalitisinterferon

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Area of Science:

  • Neurovirology
  • Immunogenetics

Background:

  • Herpes simplex encephalitis (HSE) is a severe neurological complication of herpes simplex virus (HSV) infection.
  • The underlying molecular and cellular mechanisms predisposing individuals to HSE remain largely unknown.
  • The rarity of HSE suggests a potential genetic susceptibility in affected individuals.

Purpose of the Study:

  • To investigate the molecular and cellular determinants of herpes simplex encephalitis (HSE).
  • To identify genetic factors contributing to increased susceptibility to HSV infection in the central nervous system (CNS).

Main Methods:

  • Analysis of immune responses in children with HSE.
  • Identification of mutations affecting interferon (IFN) production pathways.
  • Investigation of Toll-like Receptor 3 (TLR3) signaling in response to HSV infection.

Main Results:

  • Specific defects in innate immune responses, particularly impaired IFN-α/β and IFN-λ production, were identified in some children with HSE.
  • Mutations affected proteins in the IFN induction pathway via TLR3 stimulation.
  • Susceptibility was specific to CNS invasion by HSV, highlighting TLR3's role in CNS antiviral defense.
  • Incomplete clinical penetrance indicates other factors like age and infectious dose influence HSE development.

Conclusions:

  • The interferon-Toll-like Receptor 3 (IFN-TLR3) pathway plays a critical role in limiting HSV entry and replication within the CNS.
  • Genetic defects impairing this pathway confer susceptibility to HSE.
  • Further research is needed to understand the pathogenesis of HSE in adults.