USC News | Scans detect aging brain issues linked to dementia USC News “To prevent dementias including Alzheimer's, we may need to come up with ways to reseal the blood-brain barrier and prevent the brain from being flooded with toxic chemicals in the blood. Pericytes are the gatekeepers of the blood-brain barrier and may ... Leaks in Brain May Contribute to Dementia Upcoming Alzheimer Society Walk for Memories The OTHER Side of 50 |