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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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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NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...

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In the Absence of Type-1 IFN, HSV-1 LAT Increases γ34.5 Expression and Enhances Mortality in Infected Mice.

Jay J Oh1, Ujjaldeep Jaggi1, Deepak Arya1

  • 1Center for Neurobiology and Vaccine Development, Ophthalmology Research, Department of Surgery, Cedars-Sinai Burns & Allen Research Institute, CSMC-SSB3, 8700 Beverly Blvd., Los Angeles, CA 90048, USA.

Viruses
|August 28, 2025
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Summary

Type-I Interferon (IFN) is crucial for fighting viral infections. This study shows that the latency-associated transcript (LAT) controls the expression of the neurovirulence gene γ34.5, impacting herpes simplex virus type 1 (HSV-1) severity in the absence of IFN.

Keywords:
ICP0ICP35 (γ34.5)ICP4LATgBsurvivaltype-1 IFN

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Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • Type-I Interferon (IFN) is essential for antiviral immunity.
  • Herpes Simplex Virus type 1 (HSV-1) latency-associated transcript (LAT) role in IFN-independent infection is unclear.

Purpose of the Study:

  • Investigate LAT's effect on HSV-1 infectivity without IFN.
  • Determine the specific LAT region responsible for modulating viral neurovirulence.

Main Methods:

  • Infection of IFNαβR-/- mice and cell lines with wild-type and LAT-mutant HSV-1 strains.
  • Analysis of viral gene expression (γ34.5, gB, ICP0, ICP4) and animal survival rates.
  • Use of recombinant viruses with truncated LAT regions (1.5kb and 811bp).

Main Results:

  • IFNαβR-/- mice infected with LAT-minus HSV-1 showed increased mortality compared to LAT-plus.
  • Higher γ34.5 gene expression correlated with increased mortality in LAT-minus infections.
  • The second half of the 1.5kb LAT region was identified as critical for controlling γ34.5 expression and pathogenicity.

Conclusions:

  • LAT plays a significant role in controlling HSV-1 neurovirulence, particularly in the absence of Type-I IFN.
  • LAT regulates γ34.5 expression, with sequences beyond the 811bp region being crucial.
  • Targeting LAT or its downstream effects on γ34.5 offers a potential strategy for managing HSV-1 infections.