<p>Damage to the blood-brain barrier is linked to immune changes and cognitive decline</p>
The blood-brain barrier is a selective permeability barrier that protects the brain from harmful substances while allowing essential nutrients to pass through. It is formed by tightly packed endothelial cells and plays a crucial role in maintaining the brain's homeostasis.
Cognitive decline refers to the gradual loss of cognitive abilities, including memory, reasoning, and problem-solving skills. It can be associated with aging, neurodegenerative diseases, and other health conditions.