Brain Pericytes Enhance MFSD2A Expression and Plasma Membrane Localization in Brain Endothelial Cells Through the PDGF-BB/PDGFRβ Signaling Pathway.
Level 5 - mechanism / opinion, no new human data
In vitro laboratory study using primary rodent cells without human data.
PubMed 40649733 · doi:10.3390/ijms26135949
What was done
Primary rat brain endothelial cells (ECs) and brain pericytes (PCs) were cultured in a non-contact blood-brain barrier (BBB) coculture model. Investigators evaluated the involvement of PDGF-BB/PDGFRβ signaling on endothelial MFSD2A (a docosahexaenoic acid [DHA] transporter) by applying the PDGF receptor inhibitor AG1296, knocking down Pdgfrb in PCs, and testing PC-conditioned medium. Assays included Western blotting for protein expression, immunofluorescence for membrane localization, and radiolabeled [14C]DHA uptake assays.
What was found
The abstract reports directional outcomes without exact numerical values, effect sizes, or confidence intervals: - Coculturing ECs with PCs significantly enhanced endothelial MFSD2A expression and plasma membrane localization compared to EC monolayers alone. - PC-conditioned medium did not increase MFSD2A expression. - Treatment with AG1296 and Pdgfrb knockdown in PCs both suppressed the PC-mediated increases in MFSD2A expression and plasma membrane localization. - Coculture with PCs significantly increased [14C]DHA uptake in ECs.
Why it matters
These findings delineate a cellular signaling mechanism (PDGF-BB/PDGFRβ) by which pericytes regulate blood-brain barrier DHA transport via endothelial MFSD2A expression and localization.
Limits
The study is limited to an in vitro rat primary cell culture system and did not assess intact in vivo cerebrovascular dynamics or human BBB biology. The abstract does not report sample sizes, replicate numbers, or quantitative values.
Cited by
- supports Hotspots of MFSD2A transporter reduction on cerebral blood vessels colocalize with areas of pericyte loss.