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ROCK2 regulates microglia proliferation and neuronal survival after traumatic brain injury
Emily F Willis1, Seung Jae Kim1, Wei Chen2
1School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Australia.
Brain, Behavior, and Immunity
|January 11, 2024
Summary
ROCK2 inhibition hinders microglial repopulation after traumatic brain injury (TBI), blocking neuroprotection and cognitive benefits. This suggests ROCK2 is crucial for pro-repair microglial function post-TBI.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Traumatic brain injury (TBI) causes persistent microglial activation.
- Microglial repopulation aids TBI recovery, but underlying mechanisms are unknown.
Purpose of the Study:
- Investigate the role of ROCK2 in microglial dynamics and repair post-TBI.
- Determine the effect of ROCK2 inhibition on microglial repopulation and neuroprotection.
Main Methods:
- Utilized a small molecule inhibitor (KD025) targeting ROCK2.
- Administered KD025 during acute and subacute phases post-TBI in animal models.
- Assessed microglial proliferation, repopulation, neuroprotection, and cognitive function.
Main Results:
- ROCK2 inhibition impaired microglial proliferation and repopulation post-TBI.
- KD025 treatment abolished neuroprotective and cognitive benefits associated with microglial repopulation.
- Delayed KD025 treatment did not restore these benefits, despite allowing repopulation.
Conclusions:
- ROCK2 is essential for the pro-repair phenotype and population dynamics of repopulating microglia after TBI.
- Targeting ROCK2 early post-TBI disrupts crucial repair mechanisms mediated by microglia.
