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Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads
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Delayed Galectin-3-Mediated Reprogramming of Microglia After Stroke is Protective
Reza Rahimian1,2, Starlee Lively3, Essam Abdelhamid1,2
1CERVO Brain Research Centre, Université Laval, Québec, QC, G1J 2G3, Canada.
Molecular Neurobiology
|February 25, 2019
Summary
Galectin-3 (Gal-3) enhances microglial immune responses and reduces stroke-induced damage. Administering Gal-3 after ischemic injury promotes beneficial immune modulation, decreasing infarct size and inflammation.
Area of Science:
- Neuroimmunology
- Molecular Biology
- Immunology
Background:
- Galectin-3 (Gal-3) is a lectin with emerging immunoregulatory roles.
- Microglia are key immune cells in the central nervous system, responding to injury.
- Ischemic stroke triggers complex inflammatory responses involving microglia.
Purpose of the Study:
- To investigate the effects of Gal-3 on microglia under physiological and ischemic conditions.
- To determine Gal-3's impact on microglial morphology, migration, and secretory profile.
- To evaluate Gal-3's therapeutic potential in a stroke model.
Main Methods:
- In vitro and in vivo experiments using recombinant Gal-3.
- Middle cerebral artery occlusion (MCAO) model for ischemic injury.
- Analysis of microglial markers (Ym1, iNOS) and cytokine profiles.
- Assessment of infarct size and microglial morphology/migration.
Main Results:
- Gal-3 increased microglial ramification and motility via an IL-4-dependent mechanism.
- Post-stroke Gal-3 administration modulated microglia, increasing Ym1+ and decreasing iNOS+ cells.
- Gal-3 treatment led to reduced pro-inflammatory cytokines and increased IL-4.
- A significant decrease in infarct size was observed following Gal-3 delivery.
Conclusions:
- Gal-3 exhibits immune-modulatory properties in the context of ischemic injury.
- Delayed Gal-3 delivery after stroke promotes a shift towards an anti-inflammatory microglial phenotype.
- Gal-3 shows therapeutic potential for fine-tuning innate immunity and reducing brain damage after stroke.
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