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Published on: July 25, 2011
Ldl-stimulated microglial activation exacerbates ischemic white matter damage
Luo-Qi Zhou1, Yun-Hui Chu1, Ming-Hao Dong1
1Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
Abstract:
The role of microglia in triggering the blood-brain barrier (BBB) impairment and white matter damage after chronic cerebral hypoperfusion is unclear. Here we demonstrated that the vessel-adjacent microglia were specifically activated by the leakage of plasma low-density lipoprotein (LDL), which led to BBB breakdown and ischemic demyelination. Interestingly, we found that LDL stimulation enhanced microglial phagocytosis, causing excessive engulfment of myelin debris and resulting in an overwhelming lipid burden in microglia. Surprisingly, these lipid-laden microglia exhibited a suppressed profile of inflammatory response and compromised pro-regenerative properties. Microglia-specific knockdown of LDLR or systematic medication lowering circulating LDL-C showed protective effects against ischemic demyelination. Overall, our findings demonstrated that LDL-stimulated vessel-adjacent microglia possess a disease-specific molecular signature, characterized by suppressed regenerative properties, which is associated with the propagation of demyelination during ischemic white matter damage.
Insights
Vessel-adjacent microglia activated by leaked LDL in chronic cerebral hypoperfusion impair the blood-brain barrier and cause white matter damage. Lowering LDL levels protected against this demyelination.
Area of Science:
- Neuroscience
- Immunology
- Cerebrovascular Biology
Background:
- The role of microglia in blood-brain barrier (BBB) impairment and white matter damage following chronic cerebral hypoperfusion remains poorly understood.
- Microglia are the primary immune cells of the central nervous system, responding to injury and disease.
Purpose of the Study:
- To investigate the specific mechanisms by which microglia contribute to BBB breakdown and white matter damage in chronic cerebral hypoperfusion.
- To identify the molecular triggers and cellular responses of microglia in this pathological context.
Main Methods:
- Utilized models of chronic cerebral hypoperfusion.
- Investigated the interaction between plasma low-density lipoprotein (LDL) leakage and microglia activation.
- Analyzed microglial phagocytosis, lipid burden, and inflammatory/regenerative profiles.
- Employed microglia-specific knockdown of LDL receptor (LDLR) and systemic LDL-lowering medication.
Main Results:
- Vessel-adjacent microglia were specifically activated by leaked plasma LDL, leading to BBB breakdown and ischemic demyelination.
- LDL stimulation enhanced microglial phagocytosis of myelin debris, resulting in lipid-laden microglia with suppressed inflammatory and pro-regenerative properties.
- Microglia-specific LDLR knockdown and systemic LDL reduction conferred protection against ischemic demyelination.
Conclusions:
- LDL-stimulated, vessel-adjacent microglia exhibit a unique molecular signature with suppressed regenerative capacity, exacerbating demyelination in ischemic white matter damage.
- Targeting LDL levels or LDLR in microglia presents a potential therapeutic strategy for mitigating white matter injury in chronic cerebral hypoperfusion.
