Characterization and astrocytic modulation of system L transporters in brain microvasculature endothelial cells.
Brain trafficking of amino acids is mainly mediated by amino acids transport machineries of the blood-brain barrier (BBB), where astrocytes play a key maintenance role. However, little is known about astrocytes impacts on such transport systems, in particular system L that consists of large and small neutral amino acids (NAAs) transporters, that is, LAT1/4F2hc and LAT2/4F2hc, respectively. In the current investigation, functionality and expression of system L were studied in the immortalized mouse brain microvascular endothelial b.End3 cells cocultured with astrocytes or treated with astrocyte-conditioned media (ACM). LAT2/4F2hc mediated luminal uptake of L-phenylalanine and L-leucine resulted in significantly decreased affinity of system L in b.End3 cells treated with ACM, while LAT2/4F2hc mediated luminal uptake of L-alanine remained unchanged. Gene expression analysis revealed marked upregulation of LAT1 and 4F2hc, but downregulation of LAT2 in b.End3 cells cultured with ACM. The basal to apical transport of L-phenylalanine and L-alanine appeared to be significantly greater than that of the apical to basal direction in b.End3 cells indicating an efflux functionality of system L. No marked influence was observed for transport of L-phenylalanine in b.End3 cells cocultured with astrocytes, while a slight decrease was seen for L-alanine in the basal to apical direction. Based on our findings, we propose that system L functions as influx and/or efflux transport machinery displaying a greater propensity for the outward transport of large and small NAAs. Astrocytes appeared to modulate the transcriptic expression and uptake functionalities of system L, but not the transport activities.
Omidi
Yadollah
Y
Pharmaceutical Cell Biology, Welsh School of Pharmacy, Cardiff University, Cardiff, UK. yomidi@tbzmed.ac.ir
Barar
Jaleh
J
Ahmadian
Somaieh
S
Heidari
Hamid Reza
HR
Gumbleton
Mark
M
D027182:Amino Acid Transport System y+ / Q000235:genetics / Q000378:metabolism*; D027241:Amino Acid Transport System y+L; D000596:Amino Acids / Q000494:pharmacology; D000818:Animals; D001253:Astrocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D001692:Biological Transport / Q000187:drug effects; D001812:Blood-Brain Barrier / Q000166:cytology / Q000187:drug effects; D001921:Brain / Q000098:blood supply* / Q000166:cytology* / Q000187:drug effects; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D027301:Fusion Regulatory Protein 1, Light Chains; D005786:Gene Expression Regulation / Q000187:drug effects; D007536:Isomerism; D007700:Kinetics; D051379:Mice; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012964:Sodium / Q000494:pharmacology; D013696:Temperature; D013997:Time Factors
D027182:Amino Acid Transport System y+; D027241:Amino Acid Transport System y+L; D000596:Amino Acids; D027301:Fusion Regulatory Protein 1, Light Chains; D012333:RNA, Messenger; C518286:SLC7A8 protein, mouse; C518287:Slc7a7 protein, mouse; D012964:Sodium