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Published on: March 31, 2015
Dendritic Polyglycerol Sulfate Inhibits Microglial Activation and Reduces Hippocampal CA1 Dendritic Spine Morphology
Dusica Maysinger1, Dominic Gröger2, Andrew Lake1
1Department of Pharmacology and Therapeutics, McGill University , Montreal, QC Canada.
Abstract:
Hyperactivity of microglia and loss of functional circuitry is a common feature of many neurological disorders including those induced or exacerbated by inflammation. Herein, we investigate the response of microglia and changes in hippocampal dendritic postsynaptic spines by dendritic polyglycerol sulfate (dPGS) treatment. Mouse microglia and organotypic hippocampal slices were exposed to dPGS and an inflammogen (lipopolysaccharides). Measurements of intracellular fluorescence and confocal microscopic analyses revealed that dPGS is avidly internalized by microglia but not CA1 pyramidal neurons. Concentration and time-dependent response studies consistently showed no obvious toxicity of dPGS. The adverse effects induced by proinflammogen LPS exposure were reduced and dendritic spine morphology was normalized with the addition of dPGS. This was accompanied by a significant reduction in nitrite and proinflammatory cytokines (TNF-α and IL-6) from hyperactive microglia suggesting normalized circuitry function with dPGS treatment. Collectively, these results suggest that dPGS acts anti-inflammatory, inhibits inflammation-induced degenerative changes in microglia phenotype and rescues dendritic spine morphology.
Insights
Dendritic polyglycerol sulfate (dPGS) reduces inflammation in microglia and protects against neuronal damage. This neuroprotective compound normalizes dendritic spine morphology and reduces inflammatory markers in neurological disorder models.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglial hyperactivity and circuitry loss are hallmarks of neurological disorders.
- Inflammation significantly exacerbates these neurological conditions.
Purpose of the Study:
- To investigate the effects of dendritic polyglycerol sulfate (dPGS) on microglia and hippocampal dendritic spine morphology.
- To assess dPGS's potential as an anti-inflammatory agent in neurological contexts.
Main Methods:
- Primary mouse microglia and organotypic hippocampal slices were treated with dPGS and lipopolysaccharides (LPS).
- Confocal microscopy and intracellular fluorescence measurements were used to analyze dPGS uptake, toxicity, and effects on cellular morphology.
- Nitrite and pro-inflammatory cytokine levels (TNF-α, IL-6) were quantified.
Main Results:
- Dendritic polyglycerol sulfate (dPGS) was readily internalized by microglia without causing toxicity.
- dPGS treatment reduced LPS-induced adverse effects, including normalization of dendritic spine morphology.
- dPGS significantly decreased nitrite and pro-inflammatory cytokine release from hyperactive microglia.
Conclusions:
- Dendritic polyglycerol sulfate (dPGS) exhibits anti-inflammatory properties.
- dPGS mitigates inflammation-induced degenerative changes in microglia and rescues dendritic spine morphology, suggesting potential therapeutic benefits for neurological disorders.
