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Updated: Jul 16, 2026

Generation of Human CD40-activated B cells
13:27

Generation of Human CD40-activated B cells

Published on: October 16, 2009

Microglial activation resulting from CD40-CD40L interaction after beta-amyloid stimulation

J Tan1, T Town, D Paris

  • 1The Roskamp Institute, University of South Florida, 3515 East Fletcher Avenue, Tampa, FL 33613, USA.

Science (New York, N.Y.)
|December 22, 1999
PubMed

Insights

Alzheimer's disease involves inflammation, with microglia playing a key role. Targeting the CD40-CD40L interaction in microglia may reduce amyloid-beta-induced activation and tau pathology in Alzheimer's disease.

Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • Alzheimer's disease (AD) pathogenesis involves significant neuroinflammation.
  • Activated microglia are implicated in neuronal degeneration within AD.

Purpose of the Study:

  • To investigate the role of the CD40-CD40L pathway in amyloid-beta (Abeta)-induced microglial activation and its impact on AD pathology.
  • To determine if inhibiting CD40-CD40L signaling can mitigate AD-related neuroinflammation and neuronal damage.

Main Methods:

  • Cultured microglia were treated with Abeta and CD40 ligand (CD40L).
  • Microglia from a transgenic AD mouse model (Tg APPsw) with and without CD40L deficiency were analyzed.
  • Tumor necrosis factor alpha (TNF-alpha) production and neuronal injury were assessed.
  • Tau phosphorylation levels were measured in Tg APPsw mice deficient for CD40L.

Main Results:

  • Abeta stimulation increased CD40 expression on microglia.
  • Treatment of Abeta-stimulated microglia with CD40L elevated TNF-alpha production and induced neuronal injury.
  • Microglia from Tg APPsw mice lacking CD40L showed reduced activation.
  • Deficiency in CD40L in Tg APPsw mice led to reduced abnormal tau phosphorylation.

Conclusions:

  • The CD40-CD40L interaction is crucial for Abeta-induced microglial activation in Alzheimer's disease.
  • This interaction appears to be an early event in AD pathogenesis, influencing tau phosphorylation.
  • Targeting the CD40-CD40L pathway presents a potential therapeutic strategy for AD.

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