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Updated: Apr 16, 2026
Characterization and Isolation of Mouse Primary Microglia by Density Gradient Centrifugation
Published on: February 16, 2018
miR-203 protects microglia mediated brain injury by regulating inflammatory responses via feedback to MyD88 in
Zhao Yang1, Lina Zhong1, Shanchuan Zhong1
1Department of Neurology, Yongchuan Hospital, Chongqing Medical University, Chongqing 402160, China.
Abstract:
Much evidence demonstrates that microglia mediated inflammatory responses play an important role in brain injury in ischemia. miRNA is the important factor in regulation of inflammation. However, the effect of miRNA in microglia mediated inflammatory responses has not been well studied. In the study, we demonstrate that miR-203 negatively regulates ischemia induced microglia activation by targeting MyD88, an important adapter protein involved in most Toll-like receptors (TLRs) and interleukin-1 receptor (IL-1R) pathways. Through negative feedback, enforced expression of miR-203 or MyD88 siRNA silencing inhibits downstream NF-κβ signaling and microglia activation, thereby alleviating neuronal injury. These findings reveal that miR-203 represents a novel target regulating neuroinflammation and brain injury, thus offering a new therapeutical strategy for cerebral hypoxic diseases.
Insights
MicroRNA-203 (miR-203) inhibits inflammation in brain injury by targeting MyD88. This discovery offers a new therapeutic strategy for cerebral hypoxic diseases.
Area of Science:
- Neuroscience
- Molecular Biology
- Immunology
Background:
- Microglia-mediated inflammation is crucial in ischemic brain injury.
- MicroRNAs (miRNAs) regulate inflammatory processes.
- The role of miRNAs in microglia-driven inflammation requires further investigation.
Purpose of the Study:
- To investigate the role of miR-203 in regulating microglia-mediated inflammatory responses during ischemia.
- To identify the molecular targets of miR-203 in this context.
Main Methods:
- Investigated the effect of miR-203 on ischemia-induced microglia activation.
- Identified MyD88 as a direct target of miR-203.
- Utilized enforced expression of miR-203 and MyD88 siRNA silencing.
- Assessed downstream NF-κβ signaling and neuronal injury.
Main Results:
- miR-203 negatively regulates ischemia-induced microglia activation.
- miR-203 targets MyD88, a key adapter protein in Toll-like receptor and IL-1R signaling pathways.
- Enforced miR-203 expression or MyD88 silencing inhibited NF-κβ signaling and microglia activation.
- These interventions alleviated neuronal injury.
Conclusions:
- miR-203 acts as a negative regulator of neuroinflammation in ischemic conditions.
- Targeting miR-203 presents a potential therapeutic strategy for brain injury and cerebral hypoxic diseases.
