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Updated: Jul 16, 2026
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.
1The Roskamp Institute, University of South Florida, 3515 East Fletcher Avenue, Tampa, FL 33613, USA.
Science (New York, N.Y.)
|December 22, 1999
Summary
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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