MiR-642b-3p is upregulated in sICH and mediates thrombin-induced endothelial cell injury, at least in part, by targeting CCNA2, suggesting that the miR-642b-3p/CCNA2 axis may represent a potential mechanistic pathway involved in ICH-induced blood-brain barrier disruption.
Serum miR-642b-3p levels were significantly elevated in patients with spontaneous intracerebral hemorrhage (sICH) compared to controls.
Thrombin induction upregulated miR-642b-3p expression in human brain microvascular endothelial cells (hBMECs) and caused significant cellular injury.
Thrombin induction altered expression of pro- and anti-apoptotic proteins and tight junction markers in hBMECs.
Inhibition of miR-642b-3p significantly reversed thrombin-induced cellular damage in hBMECs.
CCNA2 was confirmed as a direct downstream target gene of miR-642b-3p via dual-luciferase reporter assay.
This research suggests that a small RNA molecule called miR-642b-3p plays an important role in the brain injury that occurs after spontaneous intracerebral hemorrhage (bleeding in the brain). The study found that levels of miR-642b-3p were notably higher in the blood of patients who had experienced spontaneous brain hemorrhage compared to controls. When the researchers simulated brain hemorrhage conditions in the laboratory by exposing human brain blood vessel cells to thrombin (a clotting protein released during bleeding), miR-642b-3p levels rose and the cells became damaged — they were less viable, underwent more cell death, produced more inflammatory signals, and lost key proteins that normally keep the blood-brain barrier intact. Importantly, when the researchers blocked miR-642b-3p activity in these cells, many of these harmful effects were reversed — cell survival improved, inflammation decreased, and the barrier proteins were partially restored. The study also identified a specific gene called CCNA2 (Cyclin A2) as a direct target that miR-642b-3p controls, providing a molecular explanation for how this small RNA molecule drives cell damage. This miR-642b-3p/CCNA2 pathway appears to be a key mechanism by which brain hemorrhage disrupts the blood-brain barrier. These findings matter because blood-brain barrier disruption after brain hemorrhage worsens outcomes for patients, and there are currently limited treatments targeting this process. This research suggests that the miR-642b-3p/CCNA2 axis could be a new therapeutic target or diagnostic biomarker for spontaneous intracerebral hemorrhage, though further research in animal models and human clinical trials would be needed before any clinical applications could be developed.
Cao Z, Yin L, Zhang X, Hong E, Du J, Liang R, et al.. (2026). Study on the Expression of MiR-642b-3p in Spontaneous Intracerebral Hemorrhage and Its Regulatory Mechanism on Endothelial Cell Injury.. Neurochemical research. https://doi.org/10.1007/s11064-026-04863-y