Interactions of Lipids, Lipoproteins, and Apolipoproteins with the Blood-Brain Barrier.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing mechanistic concepts without systematic search methodology.
PubMed 34518942 · doi:10.1007/s11095-021-03098-6
What was done
This narrative review synthesized literature examining the transport mechanisms and biological interactions of various lipids, lipoproteins, and apolipoproteins at the blood-brain barrier (BBB).
What was found
The abstract reports qualitative mechanistic findings and provides no quantitative data. High-density lipoprotein (HDL), apolipoprotein (apo) A-I, apoJ, certain free fatty acids, and triglycerides cross the BBB, whereas apoE does not. Cholesterol permeability varies by form. Biologically, HDL is described as potentially protective in multiple sclerosis, cholesterol can disrupt the BBB, triglycerides inhibit BBB leptin transport and hypothalamic leptin receptor activation, and the apoE4 isoform exerts detrimental effects on the barrier.
Why it matters
Understanding how lipid classes interact with the blood-brain barrier clarifies metabolic regulation within the central nervous system and informs potential pathways in neurological and metabolic disorders.
Limits
The abstract provides no numerical data, effect estimates, or literature search parameters. As a narrative review, it offers mechanistic summaries rather than systematic human clinical evidence.
Cited by
- contradicts Fatty acids cannot cross the blood-brain barrier directly to fuel the brain.