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- W1996136104 abstract "Abstract Contact to polyanions induces autoactivation of the serine protease factor XII that triggers the kallikrei-kinin system. Recent studies indicate that polysaccharide-induced autoactivation of factor XII has a role in allergy-related vascular leakage, and angioedema. Here, we characterize in vivo effects of the synthetic polysaccharide dextran sulfate in human plasma and in rodent models. Minute amounts of high-molecular-weight dextran sulfate-initiated factor XII-autoactivation and triggered formation of the inflammatory mediator bradykinin via plasma kallikrein-mediated cleavage of high-molecular-weight kininogen. High-molecular-weight kininogen fragments, containing the HKH20 sequence in domain D5 H , blocked dextran sulfate-initiated bradykinin-generation by depleting plasma Zn 2+ ions. Topical application of high molecular weight dextran sulfate increased leakage in murine skin microvessels, in a bradykinin-dependent manner. Intravital laser scanning microscopy showed a greater than two-fold elevated and accelerated fluid extravasation in C1 esterase inhibitor deficient mice that lack the major inhibitor of factor XII, compared to wild-type controls. Intra-arterial infusion of dextran sulfate induced a rapid transient drop in arterial blood pressure in rats and preinjection of kinin B2 receptor antagonists or HKH20 peptide blunted dextran sulfate-triggered hypotensive reactions. The data characterize dextran sulfate as a potent in vivo activator of factor XII with implications for bradykinin-mediated vascular permeability and blood pressure control." @default.
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- W1996136104 date "2013-05-01" @default.
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- W1996136104 title "Zinc-dependent contact system activation induces vascular leakage and hypotension in rodents" @default.
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- W1996136104 doi "https://doi.org/10.1515/hsz-2013-0144" @default.
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