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Increased Viral Dissemination in the Brain and Lethality in MCMV-Infected, Dicer-Deficient Neonates

Eleonore Ostermann1, Cécile Macquin2, Wojciech Krezel3

  • 1Immunorhumatologie Moléculaire, INSERM UMR S_1109, Centre de Recherche en Immunologie et Hématologie, Faculté de Médecine, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg. 1, Place de l'Hôpital, 67085 Strasbourg Cedex, France. eleonore.ostermann@hpi.uni-hamburg.de.

Viruses
|May 9, 2015
PubMed

Insights

Human Cytomegalovirus (HCMV) encephalitis poses risks, but its mechanisms are unclear. This study reveals microRNAs (miRNAs) are vital in controlling HCMV pathogenesis and protecting against encephalitis.

Area of Science:

  • Virology
  • Neuroscience
  • Genetics

Background:

  • Human Cytomegalovirus (HCMV or HHV-5) is a significant threat in congenital/neonatal infections, potentially causing severe neurological damage like encephalitis.
  • The underlying mechanisms and genetic factors contributing to HCMV encephalitis remain poorly understood, limiting prognostic and therapeutic options.

Purpose of the Study:

  • To investigate the role of genetic factors, specifically microRNAs (miRNAs), in the pathogenesis of HCMV-induced encephalitis.
  • To validate a mouse model for live imaging of viral brain dissemination and assess the impact of genetic defects on disease severity.

Main Methods:

  • Utilized a novel in vivo mouse model inoculated neonatally with a luciferase-expressing Murine Cytomegalovirus (MCMV).
  • Employed live imaging techniques to monitor viral dissemination in the brain.
  • Compared disease outcomes, including lethality and encephalitis development, in wild-type and Dicer-deficient (lacking miRNA activity) mutant mice.

Main Results:

  • Demonstrated increased lethality and encephalitis in mutant mice lacking Dicer activity following MCMV infection.
  • Validated the mouse model for live imaging of viral brain spread and pathogenesis.
  • Provided evidence that miRNAs play a critical role in controlling MCMV pathogenesis.

Conclusions:

  • MicroRNAs are essential regulators of Murine Cytomegalovirus (MCMV) pathogenesis.
  • Endothelial functions and integrity, influenced by miRNAs, are crucial in preventing or mitigating Cytomegalovirus (CMV) encephalitis.

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