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Synergistic platelet integrin signaling and factor XII activation in poly-N-acetyl glucosamine fiber-mediated hemostasis.

Abstract：

:The polymer poly-N-acetylglucosamine (pGlcNAc) containing fiber material is becoming increasingly important as a topical agent for hemostasis at wound sites. The pGlcNAc polymeric fiber provides hemostasis through redundant mechanisms that include platelet activation for fibrin network formation. The research presented here better defines the mechanism for the effect of pGlcNAc containing fibers on platelet-mediated processes. Adsorption experiments demonstrated that pGlcNAc fibers tightly bind most major plasma proteins and a specific sub-set of platelet surface proteins, including the integrin beta(3) subunit (CD61) and the von Willebrand receptor GP1b (CD42b). The result of this interaction is a platelet-dependent acceleration of fibrin gel formation. Accelerated fibrin polymerization is sensitive to factor XII inhibition by corn trypsin inhibitor and integrin inactivation with integrilin. Confocal microscopy studies show that when platelet integrins contact plasma protein-saturated pGlcNAc fibers, an increase in intracellular free calcium for platelet activation occurs to drive surface expression of phosphatidyl serine (PS). Thus, a catalytic surface for thrombin generation and accelerated fibrin clot formation results from the interaction of platelets with pGlcNAc. These findings, when considered with the observation that pGlcNAc fibers also induce red blood cell agglutination and vasoconstriction, provides an explanation for the ability of the pGlcNAc material to provide hemostasis in a wide variety of clinical applications.

journal_name

Biomaterials

journal_title

Biomaterials

authors

Fischer TH,Thatte HS,Nichols TC,Bender-Neal DE,Bellinger AD,Vournakis JN

doi

10.1016/j.biomaterials.2005.01.023

keywords:

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

5433-43

issue

27

eissn

0142-9612

issn

1878-5905

pii

S0142-9612(05)00049-9

journal_volume

26

pub_type

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