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Genomic regulation after CD40 stimulation in microglia: relevance to Alzheimer's disease
Ghania Ait-Ghezala1, Venkatarajan S Mathura, Vincent Laporte
1The Roskamp Institute, 2040 Whitfield Avenue, Sarasota, FL 34243, USA. gaitghezala@rfdn.org
Abstract:
Key pathological processes in Alzheimer's disease (AD) include the accumulation of amyloid beta peptide (Abeta) which, in excess, triggers pathological cascades including widespread inflammation, partly reflected by chronic microglial activation. It has previously been suggested that CD40/CD40L interaction promotes AD like pathology in transgenic mice. Thus, amyloid burden, gliosis and hyperphosphorylation of tau are all reduced in transgenic models of AD lacking functional CD40L. We therefore hypothesized that cellular events leading to altered APP metabolism, inflammation and increased tau phosphorylation underlying these observations would be regulated at the genomic level. In the present report, we used the Affymetrix (GeneChip) oligonucleotide microarray U133A to gain insight into the global and simultaneous transcriptomic changes in response to microglia activation after CD40/CD40L ligation. As expected, regulation of elements of the NF-kappaB signaling, chemokine and B cell signaling pathways was observed. Taken together, our data also suggest that CD40 ligation in human microglia specifically perturbs many genes associated with APP processing.
Insights
CD40 ligation in human microglia activates pathways involved in Alzheimer's disease (AD) pathology, including amyloid precursor protein (APP) processing and inflammation. This suggests CD40 signaling as a potential therapeutic target for AD.
Area of Science:
- Neuroscience
- Immunology
- Genomics
Background:
- Alzheimer's disease (AD) is characterized by amyloid beta peptide (Abeta) accumulation, inflammation, and microglial activation.
- CD40/CD40L interaction has been implicated in promoting AD-like pathology in mouse models, with its absence reducing amyloid burden and tau hyperphosphorylation.
Purpose of the Study:
- To investigate the global transcriptomic changes in human microglia upon CD40/CD40L ligation.
- To understand the genomic regulation of cellular events in AD, including altered APP metabolism, inflammation, and tau phosphorylation.
Main Methods:
- Utilized Affymetrix (GeneChip) oligonucleotide microarray U133A for simultaneous transcriptomic analysis.
- Examined global gene expression changes in human microglia following CD40/CD40L ligation.
Main Results:
- Observed regulation of key signaling pathways, including NF-kappaB, chemokine, and B cell signaling.
- Demonstrated that CD40 ligation in human microglia perturbs numerous genes associated with amyloid precursor protein (APP) processing.
Conclusions:
- CD40 ligation significantly impacts the transcriptome of human microglia, influencing pathways relevant to AD pathogenesis.
- The findings suggest that CD40 signaling plays a crucial role in regulating APP processing and inflammation in microglia, highlighting its potential as a therapeutic target for Alzheimer's disease.
