Blood-Brain Barrier (BBB)
Blood-Brain Barrier (BBB) — A selective permeability barrier separating circulating blood from brain tissue, a major obstacle for delivering peptide compounds to the central nervous system.
What Is the Blood-Brain Barrier?
The blood-brain barrier (BBB) is a highly selective semipermeable border of endothelial cells that separates circulating blood from the brain extracellular fluid. Tight junctions between brain endothelial cells prevent paracellular transport of most molecules, including peptides above ~500 Da. Crossing the BBB is the central challenge for neuroactive peptide delivery.
BBB Crossing Strategies for Peptides
- Intranasal delivery: Nose-to-brain transport via olfactory/trigeminal nerves. Used for oxytocin, Selank, Semax
- Receptor-mediated transcytosis: Conjugation to transferrin or insulin receptor-binding peptides enables active transport
- CPP conjugation: TAT, penetratin, and polyarginine enhance brain uptake
- Lipidation: Fatty acid conjugation increases passive BBB permeation for small peptides
Frequently Asked Questions
What is Blood-Brain Barrier (BBB)?
A selective permeability barrier separating circulating blood from brain tissue, a major obstacle for delivering peptide compounds to the central nervous system.
Why is Blood-Brain Barrier (BBB) important in peptide research?
Blood-Brain Barrier (BBB) is a fundamental concept in biology as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.
Authority Sources
- Blood-Brain Barrier (BBB) on Wikipedia
- Search Blood-Brain Barrier (BBB) on PubChem (NIH)
- Research articles on ScienceDirect