The lectin-like domain of thrombomodulin ameliorates diabetic glomerulopathy via complement inhibition

<p>Coagulation and complement regulators belong to two interactive systems constituting emerging mechanisms of diabetic nephropathy. Thrombomodulin (TM) regulates both coagulation and complement activation, in part through discrete domains. TM’s lectin like domain dampens complement activation...

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Hauptverfasser: Wang, Hongjie (VerfasserIn) , Bock, Fabian (VerfasserIn) , Kashif, Muhammed (VerfasserIn) , Bierhaus, Angelika (VerfasserIn) , Nawroth, Peter Paul (VerfasserIn) , Kirschfink, Michael (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2012
In: Thrombosis and haemostasis
Year: 2012, Jahrgang: 108, Heft: 12, Pages: 1141-1153
ISSN:2567-689X
DOI:10.1160/TH12-07-0460
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1160/TH12-07-0460
Verlag, Volltext: http://www.thieme-connect.de/DOI/DOI?10.1160/TH12-07-0460
Volltext
Verfasserangaben:Hongjie Wang, Ilya Vinnikov, Khurrum Shahzad, Fabian Bock, Satish Ranjan, Juliane Wolter, Muhammed Kashif, Jun Oh, Angelika Bierhaus, Peter Nawroth, Michael Kirschfink, Edward M. Conway, Thati Madhusudhan, Berend Isermann

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245 1 4 |a The lectin-like domain of thrombomodulin ameliorates diabetic glomerulopathy via complement inhibition  |c Hongjie Wang, Ilya Vinnikov, Khurrum Shahzad, Fabian Bock, Satish Ranjan, Juliane Wolter, Muhammed Kashif, Jun Oh, Angelika Bierhaus, Peter Nawroth, Michael Kirschfink, Edward M. Conway, Thati Madhusudhan, Berend Isermann 
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520 |a <p>Coagulation and complement regulators belong to two interactive systems constituting emerging mechanisms of diabetic nephropathy. Thrombomodulin (TM) regulates both coagulation and complement activation, in part through discrete domains. TM’s lectin like domain dampens complement activation, while its EGF-like domains independently enhance activation of the anticoagulant and cytoprotective serine protease protein C (PC). A protective effect of activated PC in diabetic nephropathy is established. We hypothesised that TM controls diabetic nephropathy independent of PC through its lectin-like domain by regulating complement. Diabetic nephropathy was analysed in mice lacking TM’s lectin-like domain (TM<sup>LeD/LeD</sup>) and controls (TM<sup>wt/wt</sup>). Albuminuria (290 μg/mg vs. 166 μg/mg, p=0.03) and other indices of experimental diabetic nephropathy were aggravated in diabetic TM<sup>LeD/LeD</sup>mice. Complement deposition (C3 and C5b-9) was markedly increased in glomeruli of diabetic TM<sup>LeD/LeD</sup>mice. Complement inhibition with enoxaparin ameliorated diabetic nephropathy in TM<sup>LeD/LeD</sup>mice (e.g. albuminuria 85 μg/mg vs. 290 μg/mg, p <0.001). <i>In vitro</i>TM’s lectin-like domain cell-autonomously prevented glucose-induced complement activation on endothelial cells and -notably -on podocytes. Podocyte injury, which was enhanced in diabetic TM<sup>LeD/LeD</sup>mice, was reduced following complement inhibition with enoxaparin. The current study identifies a novel mechanism regulating complement activation in diabetic nephropathy. TM’s lectin-like domain constrains glucose-induced complement activation on endothelial cells and podocytes and ameliorates albuminuria and glomerular damage in mice.</p> 
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