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Basic Science and Pathogenesis.

Domenica Donatella Li Puma1,2, Roberto Piacentini2,3, Giammarco Boni3

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This summary is machine-generated.

Herpes Simplex Virus type 1 (HSV-1) reactivation in mice induces Alzheimer

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Area of Science:

  • Neuroscience
  • Immunology
  • Virology

Background:

  • Herpes Simplex Virus type 1 (HSV-1) reactivation in the mouse brain triggers an Alzheimer's disease (AD)-like phenotype.
  • This phenotype includes synaptic and memory deficits, elevated interleukin-1β (IL-1β), and accumulation of amyloid-β (Aβ) and phosphorylated Tau (pTau).
  • Anakinra, an IL-1 receptor blocker, reversed neurodegeneration markers after two thermal stress (2TS) events.

Purpose of the Study:

  • To investigate the interplay among IL-1β, Aβ, and Tau in driving synaptic dysfunction in HSV-1 infected mice.
  • To elucidate the role of IL-1β-mediated neuroinflammation in early-stage AD.
  • To understand how Aβ and pTau contribute to IL-1β accumulation and synaptic dysfunction.

Main Methods:

  • HSV-1 infection and 2TS-induced viral reactivation in wild-type (WT), Aβ-deficient (APP-/-), and pTau-deficient (Tau-/-) mice.
  • Molecular, electrophysiological (long-term potentiation - LTP), and behavioral (novel object recognition) analyses were performed.
  • Measurement of IL-1β mRNA levels and microglial activation (CD86 expression).

Main Results:

  • HSV-1 infected Tau-/- and APP-/- mice showed lower IL-1β levels and reduced microglial activation compared to WT mice.
  • Transgenic mice exhibited milder synaptic deficits (LTP) and memory impairments than WT mice.
  • Lower IL-1β levels in APP-/- and Tau-/- mice correlated with reduced synaptic dysfunction.

Conclusions:

  • IL-1β-mediated neuroinflammation is crucial in driving synaptic dysfunction in this AD mouse model.
  • Aβ and pTau contribute to IL-1β accumulation, creating a cycle of synaptic dysfunction in AD.
  • Targeting IL-1β may offer therapeutic strategies for early-stage AD.