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- W2401231621 abstract "Plasma fibronectin (pFN) can incorporate into the lung extracellular matrix (ECM) as well as enhance hepatic cell phagocytic removal of bloodborne microparticulate debris that can contribute to lung vascular injury. Treatment of human pFN (hFN) with N-ethylmaleimide (NEM) blocks its ECM incorporation but not its ability to augment phagocytosis. Using hFN purified from fresh human plasma cryoprecipitate, we compared the effect of NEM-treated hFN versus normal hFN on lung transvascular protein clearance (TVPC) in postoperative bacteremic sheep to determine whether the ability of hFN to attenuate the increase in lung endothelial permeability required its ECM incorporation. Sheep with lung lymph fistulas were infused with a sublethal dose of Pseudomonas aeruginosa (5 × 10 8 ) 48 h after surgery. In the first study, sheep received either FN-rich human cryoprecipitate, FN-deficient cryoprecipitate, FN purified from cryoprecipitate (hFN), FN-deficient cryoprecipitate reconstituted with purified hFN, or the sterile saline diluent. In the second study, sheep received either 200 mg of purified hFN ( group I), 200 mg of NEM-treated hFN ( group II), or the saline diluent ( group III). In the first study, the increase in TVPC after bacterial challenge was attenuated by FN-rich cryoprecipitate, hFN, or reconstituted FN-deficient cryoprecipitate ( P < 0.05) but not by saline and FN-deficient cryoprecipitate. In the second study, TVPC increased by 2 h ( P < 0.05) and peaked over 4–8 h ( P < 0.05) at 380–420% above baseline in postoperative bacteremic sheep given the diluent ( group III). In contrast, intravenous infusion of hFN, but not of NEM-treated hFN, significantly ( P < 0.05) attenuated this increase of lung protein clearance. Thus the ability for the intravenously infused purified pFN to attenuate the increase in lung endothelial protein permeability in sheep during postsurgical bacteremia appears to require its ECM incorporation into the interstitial ECM of the lung." @default.
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- W2401231621 date "1999-10-01" @default.
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- W2401231621 title "Lung matrix incorporation of plasma fibronectin reduces vascular permeability in postsurgical bacteremia" @default.
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- W2401231621 doi "https://doi.org/10.1152/ajplung.1999.277.4.l749" @default.
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