Impaired TGFβ Signaling in Plaque-Associated Microglia
Oliver Krzyzan1,2, Angela Kuhla3,4, Björn Spittau5
1Institute of Anatomy, Rostock Medical Centre, Rostock University, 18057 Rostock, Germany.
Abstract:
Aging and Alzheimer's disease (AD) are associated with profound changes in glial cell morphology and signaling. This study investigates the three-dimensional morphology of microglia and the intracellular localization of phosphorylated SMAD proteins as downstream effectors of transforming growth factor β (TGF-β) signaling in the amyloid precursor protein and presenilin-1 (APP/PS1) transgenic mouse model of Alzheimer's disease. Using confocal microscopy and Simple Neurite Tracer software, we reconstructed and quantitatively analyzed glial cell morphology in aged wild-type and APP/PS1 mice. Immunofluorescence staining revealed altered pSMAD2 distribution in microglia, suggesting impaired canonical TGF-β signaling. Our findings indicate a disturbed glial morphology and dysfunctional TGF-β signaling cascade in the APP/PS1 model, underlining their potential role in Alzheimer's disease pathogenesis.
Insights
This study reveals that Alzheimer's disease (AD) in mice disrupts microglial cell shape and transforming growth factor beta (TGF-β) signaling. These changes in glial cells and TGF-β pathways may contribute to AD development.
Area of Science:
- Neuroscience
- Cell Biology
- Pathology
Background:
- Aging and Alzheimer's disease (AD) are linked to significant alterations in glial cell structure and function.
- Microglia, the brain's immune cells, and transforming growth factor beta (TGF-β) signaling are implicated in AD pathogenesis.
Purpose of the Study:
- To investigate the three-dimensional morphology of microglia.
- To examine the intracellular localization of phosphorylated SMAD proteins, key effectors of TGF-β signaling.
- To analyze these factors in the amyloid precursor protein and presenilin-1 (APP/PS1) transgenic mouse model of AD.
Main Methods:
- Utilized confocal microscopy for high-resolution imaging of glial cells.
- Employed Simple Neurite Tracer software for quantitative analysis of cell morphology.
- Performed immunofluorescence staining to detect pSMAD2 protein localization in microglia.
Main Results:
- Observed significant alterations in the three-dimensional morphology of microglia in APP/PS1 mice compared to wild-type controls.
- Found altered intracellular distribution of phosphorylated SMAD2 (pSMAD2) in microglia.
- These findings suggest impaired canonical TGF-β signaling in the AD mouse model.
Conclusions:
- The study demonstrates disturbed glial cell morphology in the APP/PS1 mouse model.
- Dysfunctional TGF-β signaling cascade was identified in microglia within the AD model.
- These cellular and signaling disturbances highlight a potential role in Alzheimer's disease pathogenesis.
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