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Salvianolic Acid B Ameliorates Lipopolysaccharide-Induced Albumin Leakage from Rat Mesenteric Venules through Src-Regulated Transcelluar Pathway and Paracellular Pathway

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  • Chun-Shui Pan
  • Ying-Hua Liu
  • Yu-Ying Liu
  • Yu Zhang
  • Ke He
  • Xiao-Yuan Yang
  • Bai-He Hu
  • Xin Chang
  • Ming-Xia Wang
  • Xiao-Hong Wei
  • Jing-Yu Fan
  • Xin-Min Wu
  • Jing-Yan Han

Abstract

Lipopolysaccharide (LPS) causes microvascular barrier disruption, leading to albumin leakage from microvessels resulting in a range of disastrous sequels. Salvianolic acid B (SalB) is a major water-soluble component derived from Salvia miltiorrhiza. Previous studies showed its potential to attenuate microvascular barrier dysfunction, but the underlying mechanism is not fully understood. The present study was intended to investigate the impact of SalB on endothelial cell barrier in vivo in rat mesenteric venules as well as in vitro in human umbilical vein endothelial cells (HUVECs), aiming at disclosing the mechanism thereof, particularly the role of Src in its action. Male Wistar rats were challenged by infusion of LPS (2 mg/kg/h) through left femoral vein for 90 min. SalB (5 mg/kg/h) was administrated either simultaneously with LPS or 30 min after LPS infusion through the left jugular vein. Vesicles in venular walls were observed by electron microscopy. HUVECs were incubated with LPS with or without SalB. The expression of Zonula occluden-1 (ZO-1), VE-cadherin, caveolin-1 and Src in HUVECs was assessed by Western blot and confocal microscopy, binding of SalB to Src was measured using Surface Plasmon Resonance and BioLayer Interferometry. Treatment with SalB inhibited albumin leakage from rat mesenteric venules and inhibited the increase of vesicle number in venular endothelial cells induced by LPS. In addition, SalB inhibited the degradation of ZO-1, the phosphorylation and redistribution of VE-cadherin, the expression and phosphorylation of caveolin-1, and phosphoirylation of Src in HUVECs exposed to LPS. Furthermore, SalB was found able to bind to Src. This study demonstrates that protection of SalB against microvascular barrier disruption is a process involving both para- and trans-endothelial cell pathway, and highly suggests Src as the key enzyme for SalB to work.

Suggested Citation

  • Chun-Shui Pan & Ying-Hua Liu & Yu-Ying Liu & Yu Zhang & Ke He & Xiao-Yuan Yang & Bai-He Hu & Xin Chang & Ming-Xia Wang & Xiao-Hong Wei & Jing-Yu Fan & Xin-Min Wu & Jing-Yan Han, 2015. "Salvianolic Acid B Ameliorates Lipopolysaccharide-Induced Albumin Leakage from Rat Mesenteric Venules through Src-Regulated Transcelluar Pathway and Paracellular Pathway," PLOS ONE, Public Library of Science, vol. 10(5), pages 1-14, May.
    • Handle: RePEc:plo:pone00:0126640
    DOI: 10.1371/journal.pone.0126640
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    1. Fabrizio Orsenigo & Costanza Giampietro & Aldo Ferrari & Monica Corada & Ariane Galaup & Sara Sigismund & Giuseppe Ristagno & Luigi Maddaluno & Gou Young Koh & Davide Franco & Vartan Kurtcuoglu & Dimo, 2012. "Phosphorylation of VE-cadherin is modulated by haemodynamic forces and contributes to the regulation of vascular permeability in vivo," Nature Communications, Nature, vol. 3(1), pages 1-15, January.
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