title: Organ-specific protection against lipopolysaccharide-induced vascular leak is dependent on the endothelial protein C receptor.
abstract: OBJECTIVE
  To study the role of the endothelial protein C receptor (EPCR) in the modulation of susceptibility to inflammation-induced vascular leak in vivo.
  
  
  RESULTS
  Genetically modified mice with low, <10% EPCR expression (EPCR(low)) and control mice were challenged with lipopolysaccharides in a mouse model of endotoxemia. Infrared fluorescence and quantification of albumin-bound Evans Blue in tissues and intravascular plasma volumes were used to assess plasma extravasation. Pair-wise analysis of EPCR(low) and control mice matched for sex, age, and weight allowed determination of EPCR-dependent vascular leak. Kidney, lung, and brain were the organs with highest discriminative increased Evans Blue accumulation in EPCR(low) versus control mice in response to lipopolysaccharides. Histology of kidney and lung confirmed the EPCR-specific pathology. In addition to severe kidney injury in response to lipopolysaccharides, EPCR(low) and anti-EPCR-treated wild-type mice suffered from enhanced albuminuria and profound renal hemorrhage versus controls. Intravascular volume loss at the same extent of weight loss in EPCR(low) mice compared with control mice provided proof that plasma leak was the predominant cause of Evans Blue tissue accumulation.
  
  
  CONCLUSIONS
  This study demonstrates an important protective role for EPCR in vivo against vascular leakage during inflammation and suggests that EPCR-dependent vascular protection is organ-specific.
authors: Department of Molecular and Experimental Medicine, The Scripps Research Institute, MEM 180, 10550 North Torrey Pines Rd, La Jolla, CA 92037, USA. avondrygalski@ucsd.edu
authors: Annette
authors: A
authors: von Drygalski
authors: Christian
authors: C
authors: Furlan-Freguia
authors: Wolfram
authors: W
authors: Ruf
authors: John H
authors: JH
authors: Griffin
authors: Laurent O
authors: LO
authors: Mosnier
mesh_terms: D000419:Albuminuria / Q000139:chemically induced / Q000378:metabolism; D000818:Animals; D001921:Brain / Q000098:blood supply* / Q000473:pathology; D002199:Capillary Permeability; D004195:Disease Models, Animal; D000074283:Endothelial Protein C Receptor; D004730:Endothelium, Vascular / Q000378:metabolism* / Q000473:pathology; D019446:Endotoxemia / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology; D005070:Evans Blue / Q000378:metabolism; D005260:Female; D006023:Glycoproteins / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D006470:Hemorrhage / Q000139:chemically induced / Q000378:metabolism; D007249:Inflammation / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology; D007668:Kidney / Q000098:blood supply* / Q000473:pathology; D008070:Lipopolysaccharides; D008168:Lung / Q000098:blood supply* / Q000473:pathology; D055370:Lung Injury / Q000139:chemically induced / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D010953:Plasma Volume; D011485:Protein Binding; D011956:Receptors, Cell Surface; D012709:Serum Albumin / Q000378:metabolism; D013997:Time Factors
chemical_list: D000074283:Endothelial Protein C Receptor; D006023:Glycoproteins; D008070:Lipopolysaccharides; C080248:Procr protein, mouse; D011956:Receptors, Cell Surface; D012709:Serum Albumin; C440499:lipopolysaccharide, Escherichia coli O111 B4; D005070:Evans Blue
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