ZO-1 Review Clarifies Evidence for Blood-Brain Barrier Recovery After Ischemia
Published in Brain/Neurology, Ischemia, Journals.
Published October 26, 2026.
A review published October 21 in Frontiers in Cell and Developmental Biology examines how the junctional protein ZO-1 changes when the brain loses and then regains blood supply. Bosi Zhou and colleagues argue that the protein’s location and organization matter alongside its overall quantity.
ZO-1 helps organize junctions between blood-vessel lining cells. During ischemia and reperfusion, internalization, degradation and redistribution can disrupt those junctions without necessarily lowering total protein levels. Conversely, blood-brain barrier permeability can improve without a matching increase in ZO-1 abundance.
This distinction matters when interpreting experiments that report restored ZO-1 as evidence of protection. Other transport routes and components of the neurovascular system also influence barrier function.
Evidence limits: Most evidence reviewed is preclinical. Interventions that improve both ZO-1 measurements and leakage do not necessarily prove that ZO-1 caused the recovery. The authors present it as an informative indicator of junctional integrity, rather than a universally reliable measure of barrier repair or an established treatment target. Human studies are needed to clarify its causal and clinical relevance.
Source: Zhou et al., Frontiers in Cell and Developmental Biology, October 21, 2026.