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A Versatile Murine Model of Subcortical White Matter Stroke for the Study of Axonal Degeneration and White Matter Neurobiology
Published on: March 17, 2016
Inhibition of SLC11A1-Mediated Lysosomal Iron Accumulation in Microglia Promotes Repair Following White Matter Stroke
Lingling Qiu1,2, Yajie Zhang1,3, Yushi Tang1
1Department of Neurology and Clinical Research Center of Neurological Disease, The Second Affiliated Hospital of Soochow University, Suzhou, China.
Abstract:
White matter stroke (WMS) results in demyelinating changes and neurological deficits. However, the underlying molecular mechanisms of demyelination after stroke and the specific role of microglia in white matter rehabilitation remain incompletely elucidated. This study identifies a time-dependent accumulation of iron in microglial lysosomes mediated by solute carrier family 11 member 1 (SLC11A1), which persists from 12 h to 14 days following WMS. This iron accumulation results in damaged lysosomal myelin debris uptake and degradation in microglia. Notably, iron chelation with deferoxamine (DFO), microglia-specific knockdown of SLC11A1, and administration of LM22B-10, a SLC11A1 antagonist identified in this study, effectively reduce lysosomal iron accumulation in microglia, enhance microglial uptake and clearance of myelin debris, and ultimately promote functional recovery after WMS. Furthermore, SLC11A1 functions as a H+/Fe2+ antiporter that transports Fe2+ from the cytoplasm into lysosomes both in vitro and in vivo. Collectively, these results highlight that targeting SLC11A1 represents a previously unrecognized therapeutic strategy for WMS repair with significant clinical implications.
Insights
Microglia accumulate iron after white matter stroke (WMS), impairing myelin debris clearance. Targeting SLC11A1 reduces iron, enhances debris clearance, and promotes functional recovery in WMS repair.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- White matter stroke (WMS) causes demyelination and neurological deficits.
- The role of microglia in white matter repair post-stroke is not fully understood.
- Molecular mechanisms of post-stroke demyelination require further elucidation.
Purpose of the Study:
- To investigate the role of microglia in white matter repair after stroke.
- To identify molecular mechanisms underlying demyelination and rehabilitation.
- To explore potential therapeutic targets for WMS.
Main Methods:
- Investigated time-dependent iron accumulation in microglia post-WMS.
- Utilized iron chelation (deferoxamine), gene knockdown, and a novel antagonist (LM22B-10) targeting SLC11A1.
- Performed in vitro and in vivo studies to analyze SLC11A1 function as a H+/Fe2+ antiporter.
Main Results:
- Identified persistent, time-dependent iron accumulation in microglial lysosomes mediated by SLC11A1 post-WMS.
- Demonstrated that iron accumulation impairs microglial uptake and degradation of myelin debris.
- Showed that targeting SLC11A1 (via chelation, knockdown, or antagonist) reduces lysosomal iron, enhances myelin clearance, and promotes functional recovery.
Conclusions:
- SLC11A1 mediates iron transport into microglial lysosomes, contributing to impaired myelin debris clearance after WMS.
- Targeting SLC11A1 represents a novel therapeutic strategy for promoting white matter repair and functional recovery post-stroke.
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