Sphingosine 1-phosphate (S1P) carrier-dependent regulation of endothelial barrier: high density lipoprotein (HDL)-S1P prolongs endothelial barrier enhancement as compared with albumin-S1P via effects on levels, trafficking, and signaling of S1P1 - Wilkerson, B A; Grass, G D; Wing, S B; Argraves, W S; Argraves, K M (J Biol Chem, 2012)