Brain endothelial cell (BEC)

Brain endothelial cells (BECs) are specialized cells that form the primary structural and functional basis of the blood-brain barrier (BBB), maintaining CNS homeostasis by strictly regulating the exchange of ions, molecules, and cells between the blood and the brain (Daneman & Prat, 2015). Unlike peripheral endothelial cells, BECs are characterized by continuous tight junctions—composed of proteins like Claudin-5 and Occludin—that severely limit paracellular permeability and a lack of fenestrations (Abbott et al., 2010). They express a variety of specific transporters, such as GLUT1 for glucose uptake and P-glycoprotein for the efflux of potentially toxic xenobiotics, which often complicates the delivery of therapeutic agents to the brain (Pardridge, 2005). Dysfunction of the cerebral vasculature is a hallmark of several neurological conditions, including stroke, where barrier breakdown leads to edema, and Alzheimer's disease, where impaired clearance of amyloid-beta across the BECs contributes to plaque formation (Sweeney et al., 2019). Pharmacological strategies targeting BECs often focus on either bypassing the barrier using receptor-mediated transcytosis (e.g., targeting the transferrin receptor) or restoring barrier integrity in inflammatory diseases like multiple sclerosis (Obermeier et al., 2013).

Other names

Cerebral endothelial cellBrain microvascular endothelial cellBMECBlood-brain barrier endotheliumCerebral vasculature

Modulation of tight junction integrity, inhibition of efflux transporters (e.g., P-glycoprotein), and receptor-mediated transcytosis for CNS drug delivery.