Albumin modulates S1P delivery from red blood cells in perfused microvessels: mechanism of the protein effect

Abstract

Adamson RH, Clark JF, Radeva M, Kheirolomoom A, Ferrara KW, Curry FE. Albumin modulates S1P delivery from red blood cells in perfused microvessels: mechanism of the protein effect. Am J Physiol Heart Circ Physiol 306: H1011-H1017, 2014. First published February 15, 2014 doi:10.1152/ajpheart.00829.2013.-Removal of plasma proteins from perfusates increases vascular permeability. The common interpretation of the action of albumin is that it forms part of the permeability barrier by electrostatic binding to the endothelial glycocalyx. We tested the alternate hypothesis that removal of perfusate albumin in rat venular microvessels decreased the availability of sphingosine-1-phosphate (S1P), which is normally carried in plasma bound to albumin and lipoproteins and is required to maintain stable baseline endothelial barriers (Am J Physiol Heart Circ Physiol 303: H825-H834, 2012). Red blood cells (RBCs) are a primary source of S1P in the normal circulation. We compared apparent albumin permeability coefficients [solute permeability (P s)] measured using perfusates containing albumin (10 mg/ml, control) and conditioned by 20-min exposure to rat RBCs with P s when test perfusates were in RBC-conditioned protein-free Ringer solution. The control perfusate S1P concentration (439 Ϯ 46 nM) was near the normal plasma value at 37°C and established a stable baseline P s (0.9 Ϯ 0.4 ϫ 10 Ϫ6 cm/s). Ringer solution perfusate contained 52 Ϯ 8 nM S1P and increased P s more than 10-fold (16.1 Ϯ 3.9 ϫ 10 Ϫ6 cm/s). Consistent with albumin-dependent transport of S1P from RBCs, S1P concentrations in RBC-conditioned solutions decreased as albumin concentration, hematocrit, and temperature decreased. Protein-free Ringer solution perfusates that used liposomes instead of RBCs as flow markers failed to maintain normal permeability, reproducing the "albumin effect" in these mammalian microvessels. We conclude that the albumin effect depends on the action of albumin to facilitate the release and transport of S1P from RBCs that normally provide a significant amount of S1P to the endothelium. albumin; endothelium; permeability; sphingosine-1-phosphate; vascular WE AND OTHERS have demonstrated that red blood cells (RBCs) are an important source of the plasma phospholipid sphingosine-1-phosphate (S1P), which acts continuously to maintain normal vascular permeability (7,9,24,34,43,50). The aim of the present experiments was to investigate the mechanisms that control the delivery of S1P from RBCs to the endothelium in intact microvessels. Our specific focus was the action of albumin as a carrier of S1P and as a modulator of vascular permeability. It has been known for many decades that the presence of albumin in vascular perfusates stabilizes the endothelial barrier (13,14,18,23,25,28,46). Removal of plasma proteins from perfusates increases vascular permeability and results in loss of the endothelial glycocalyx (11,29,32,33).The common interpretation of the action of albumin is that it forms part of the permeability barrier by electrostatic bindin...

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