Intrinsic endothelial remodeling drives brain capillary repair.

Brain capillary endothelial cells autonomously repair injury through VEGFR2-dependent membrane extension, restoring blood flow within 24-48 hours in mice.

• Why it matters: Understanding how brain microvasculature repairs itself is crucial for developing treatments for cerebrovascular injuries and diseases, yet the mechanisms remain poorly understood.
• What they did: Using longitudinal two-photon imaging in mice, the study observed neighboring endothelial cells extending their plasma membranes to reconnect after focal injury, with regional differences noted between hippocampal and cortical capillaries.
• The result: This intrinsic repair mechanism highlights the brain's capacity to maintain microvascular integrity, revealing regional vulnerabilities that could influence resilience to injury and inform therapeutic strategies.