Structural barriers

Structural barriers refer to anatomical and cellular structures—such as the blood-brain barrier, placental barrier, and tightly joined endothelial cell layers—that function to restrict or control the movement of substances (including chemicals, pathogens, and drugs) between body compartments or into sensitive organs. These barriers are essential in regulating physiological homeostasis, protecting vulnerable tissues from toxins or pathogens, and controlling distribution of therapeutic agents. They are not single molecular entities or drug targets, but rather composite physiological features[2][4]. This entry is marked as "is_incorrect: true" because "structural barriers" do not correspond to a single, specific molecule or receptor, and thus cannot be considered a discrete therapeutic target in the structure-activity or drug development sense.

Other names

Blood-brain barrierplacental barrierendothelial barriertissue barrierphysical barrieranatomical barrier