Marion Fischer

Initiation of blood coagulation - Evaluating the relevance of specific surface functionalities using self assembled monolayers

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Kurzfassung in Englisch

The surface of biomaterials can induce contacting blood to coagulate, similar to the response initiated by injured blood vessels to control blood loss. This poses a challenge to the use of biomaterials as the resulting coagulation can impair the performance of hemocompatible devices such as catheters, vascular stents and various extracorporeal tubings [1], what can moreover cause severe host reactions like embolism and infarction.
Biomaterial induced coagulation processes limit the therapeutic use of medical products, what motivates the need for a better understanding of the basic mechanisms leading to this bio-incompatibility [2] in order to define modification strategies towards improved biomaterials [3]. Several approaches for the enhancement of hemocompatible surfaces include passive and active strategies for surface modifications. The materials’
chemical-physical properties like surface chemistry, wettability and polarity are parameters of passive modification approaches for improved hemocompatibility and are the focus of the present work.
In the present study self assembled monolayers with different surface functionalities (-COOH, -OH, -CH3) were applied as well as two-component-layers with varying fractions of these, as they allow a defined graduation of surface wettability and charge.
The ease of control over these parameters given by these model surfaces enables the evaluation of the influence of specific surface-properties on biological responses.
To evaluate the effects of different surface chemistry on initial mechanisms of biomaterial induced coagulation, the surfaces were incubated with protein solution, human plasma, blood cell fractions or fresh heparinised human whole blood. Indicative hemocompatibility parameters were subsequently analysed focusing on protein adsorption, coagulation activation, contact activation (intrinsic/ enhancer pathway), impact of tissue factor (extrinsic/ activator pathway) and cellular systems (blood
platelets and leukocytes).

weitere Metadaten

Blood coagulation, cell activation, self assembled monolayers, hemocompatibility
Blutgerinnung, Zellaktivierung, Self assembled monolayer, Hämokompatibilität
DDC Klassifikation570
RVK KlassifikationWW 8960
HochschuleTechnische Universität Dresden
FakultätMathematik und Naturwissenschaften
ProfessurProfessur für Biofunktionelle Polymermaterialien
BetreuerProf. Dr. Carsten Werner
GutachterProf. Dr. Brigitte Voit
Prof. Dr. Carsten Werner
Tag d. Einreichung (bei der Fakultät)06.05.2010
Tag d. Verteidigung / Kolloquiums / Prüfung24.06.2010
Veröffentlichungsdatum (online)05.07.2010
persistente URNurn:nbn:de:bsz:14-qucosa-38768

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