TY - JOUR
T1 - Enhanced vascular permeability facilitates entry of plasma HDL and promotes macrophage-reverse cholesterol transport from skin in mice
AU - Kareinen, Ilona
AU - Cedó, Lídia
AU - Silvennoinen, Reija
AU - Laurila, Pirkka Pekka
AU - Jauhiainen, Matti
AU - Julve, Josep
AU - Blanco-Vaca, Francisco
AU - Escola-Gil, Joan Carles
AU - Kovanen, Petri T.
AU - Lee-Rueckert, Miriam
PY - 2015/2/1
Y1 - 2015/2/1
N2 - Copyright © 2015 by the American Society for Biochemistry and Molecular Biology, Inc. Reverse cholesterol transport (RCT) pathway from macrophage foam cells initiates when HDL particles cross the endothelium, enter the interstitial fluid, and induce cholesterol efflux from these cells. We injected [ 3 H] cholesterol-loaded J774 macrophages into the dorsal skin of mice and measured the transfer of macrophage-derived [ 3 H]cholesterol to feces [macrophage-RCT (m-RCT)]. Injection of histamine to the macrophage injection site increased locally vascular permeability, enhanced influx of intravenously administered HDL, and stimulated m-RCT from the histamine-treated site. The stimulatory effect of histamine on m-RCT was abolished by prior administration of histamine H1 receptor (H1R) antagonist pyrilamine, indicating that the histamine effect was H1R-dependent. Subcutaneous administration of two other vasoactive mediators, serotonin or bradykinin, and activation of skin mast cells to secrete histamine and other vasoactive compounds also stimulated m-RCT. None of the studied vasoactive mediators affected serum HDL levels or the cholesterol-releasing ability of J774 macrophages in culture, indicating that acceleration of m-RCT was solely due to increased availability of cholesterol acceptors in skin. We conclude that disruption of the endothelial barrier by vasoactive compounds enhances the passage of HDL into interstitial fluid and increases the rate of RCT from peripheral macrophage foam cells, which reveals a novel tissue cholesterol-regulating function of these compounds.
AB - Copyright © 2015 by the American Society for Biochemistry and Molecular Biology, Inc. Reverse cholesterol transport (RCT) pathway from macrophage foam cells initiates when HDL particles cross the endothelium, enter the interstitial fluid, and induce cholesterol efflux from these cells. We injected [ 3 H] cholesterol-loaded J774 macrophages into the dorsal skin of mice and measured the transfer of macrophage-derived [ 3 H]cholesterol to feces [macrophage-RCT (m-RCT)]. Injection of histamine to the macrophage injection site increased locally vascular permeability, enhanced influx of intravenously administered HDL, and stimulated m-RCT from the histamine-treated site. The stimulatory effect of histamine on m-RCT was abolished by prior administration of histamine H1 receptor (H1R) antagonist pyrilamine, indicating that the histamine effect was H1R-dependent. Subcutaneous administration of two other vasoactive mediators, serotonin or bradykinin, and activation of skin mast cells to secrete histamine and other vasoactive compounds also stimulated m-RCT. None of the studied vasoactive mediators affected serum HDL levels or the cholesterol-releasing ability of J774 macrophages in culture, indicating that acceleration of m-RCT was solely due to increased availability of cholesterol acceptors in skin. We conclude that disruption of the endothelial barrier by vasoactive compounds enhances the passage of HDL into interstitial fluid and increases the rate of RCT from peripheral macrophage foam cells, which reveals a novel tissue cholesterol-regulating function of these compounds.
KW - Bradykinin
KW - Cholesterol
KW - Foam cells
KW - High density lipoprotein
KW - Histamine
KW - Lipoproteins
KW - Mast cells
KW - Serotonin
U2 - 10.1194/jlr.M050948
DO - 10.1194/jlr.M050948
M3 - Article
VL - 56
SP - 241
EP - 253
IS - 2
ER -