Peptide Bbeta(15-42) preserves endothelial barrier function in shock.

Peptide Bbeta(15-42) preserves endothelial barrier function in shock.
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DOI:
10.1371/journal.pone.0005391
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发表时间:
2009
期刊:
影响因子:
3.7
通讯作者:
Reingruber S
Reingruber S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gröger M;Pasteiner W;Ignatyev G;Matt U;Knapp S;Atrasheuskaya A;Bukin E;Friedl P;Zinkl D;Hofer-Warbinek R;Zacharowski K;Petzelbauer P;Reingruber S

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Loss of vascular barrier function causes leak of fluid and proteins into tissues, extensive leak leads to shock and death. Barriers are largely formed by endothelial cell-cell contacts built up by VE-cadherin and are under the control of RhoGTPases. Here we show that a natural plasmin digest product of fibrin, peptide Bß15-42 (also called FX06), significantly reduces vascular leak and mortality in animal models for Dengue shock syndrome. The ability of Bß15-42 to preserve endothelial barriers is confirmed in rats i.v.-injected with LPS. In endothelial cells, Bß15-42 prevents thrombin-induced stress fiber formation, myosin light chain phosphorylation and RhoA activation. The molecular key for the protective effect of Bß15-42 is the src kinase Fyn, which associates with VE-cadherin-containing junctions. Following exposure to Bß15-42 Fyn dissociates from VE-cadherin and associates with p190RhoGAP, a known antagonists of RhoA activation. The role of Fyn in transducing effects of Bß15-42 is confirmed in Fyn−/− mice, where the peptide is unable to reduce LPS-induced lung edema, whereas in wild type littermates the peptide significantly reduces leak. Our results demonstrate a novel function for Bß15-42. Formerly mainly considered as a degradation product occurring after fibrin inactivation, it has now to be considered as a signaling molecule. It stabilizes endothelial barriers and thus could be an attractive adjuvant in the treatment of shock.
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