Scientists studying Alzheimer’s disease are investigating a potential treatment direction that focuses not only on neurons, but also on the blood vessels supporting the brain.
Researchers examined APOE4, the strongest common genetic risk factor associated with developing Alzheimer’s disease. Their work identified a possible connection between APOE4 and abnormal changes in pericytes—specialized cells that surround small blood vessels and help maintain the blood-brain barrier.
According to the research, APOE4 may encourage some of these cells to enter a scar-forming state. That process could contribute to vascular damage and interfere with the environment needed for healthy brain function.
Researchers then investigated a signaling pathway involving a protein called TGF-beta. In mouse experiments, blocking this pathway reversed aspects of the vascular damage associated with APOE4.
The finding is particularly interesting because much Alzheimer’s research has historically concentrated on abnormal proteins such as amyloid and tau. The new work adds to growing evidence that blood vessels, inflammation and supporting brain cells may also play significant roles in how the disease develops.
There is an important limitation: the reversal was demonstrated in experimental models, not in people with Alzheimer’s disease. It therefore should not be interpreted as evidence that scientists can currently reverse Alzheimer’s brain damage in patients.
Nevertheless, understanding how APOE4 damages the brain could reveal additional treatment targets and eventually contribute to therapies that attack Alzheimer’s through several biological pathways rather than focusing on one mechanism alone.
