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Protective role of interferon regulatory factor 3-mediated signaling against prion infection

Daisuke Ishibashi1, Ryuichiro Atarashi, Takayuki Fuse

  • 1Department of Molecular Microbiology and Immunology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan. dishi@nagasaki-u.ac.jp

Journal of Virology
|March 2, 2012
PubMed

Insights

Interferon regulatory factor 3 (IRF3) plays a crucial role in innate immunity against prion diseases. IRF3 deficiency accelerates prion disease progression, indicating its protective function in transmissible spongiform encephalopathies (TSEs).

Area of Science:

  • Neuroimmunology
  • Infectious Diseases
  • Molecular Biology

Background:

  • Transmissible spongiform encephalopathies (TSEs) are caused by abnormal prion protein (PrPSc) derived from cellular PrP (PrPC).
  • Acquired immune responses are absent in TSEs, but innate immunity activation may impede disease progression.
  • The precise role of the innate immune system, particularly interferon regulatory factor 3 (IRF3), in prion infection remains unclear.

Purpose of the Study:

  • To investigate the function of IRF3, a key transcription factor in type I interferon production, in the context of prion infection.
  • To elucidate the role of IRF3 in the innate immune response to transmissible spongiform encephalopathies.

Main Methods:

  • Utilized IRF3-deficient mice and wild-type controls for prion infection studies.
  • Employed cell culture systems to assess the impact of IRF3 modulation on prion propagation.
  • Administered three distinct murine TSE strains (22L, FK-1, mBSE) via intraperitoneal injection.

Main Results:

  • IRF3-deficient mice showed significantly earlier onset of TSE compared to wild-type controls.
  • Overexpression of IRF3 in cell cultures attenuated prion infection.
  • Silencing IRF3 using siRNAs led to increased PrPSc levels in prion-infected cells.

Conclusions:

  • IRF3 negatively regulates the formation and accumulation of abnormal prion protein (PrPSc).
  • IRF3 acts as a protective factor against prion disease progression.
  • These findings offer novel insights into the host innate immune system's involvement in prion disease pathogenesis.

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