[In vitro study of regulation of shear stress on antithrombogenic potentials of endothelialized polyurethane small diameter artificial blood vessel].
This study was designed to investigate the changes of prostaglandin I2 (PGI2) and nitric oxide (NO) secreted by endothelialized polyurethane small diameter artificial blood vessel. The peripheral blood mononuclear cells of healthy adult were separated and induced into endothelial progenitor cells (EPCs), which were identified by the methods of discrepancy microphage and fluorescent immunology labeling. After the induced cells being seeded on the polyurethane small-diameter artificial vessels, the endothelialized polyurethane small diameter artificial blood vessels were divided into four different experimental groups, including stationary group, low-flow shear stress group (5 dynes/cm2), medium-flow shearstress group (15 dynes/cm2), and high-flow shear stress group (25 dynes/cm2). Then, the levels of 6-ketoprostaglandin F1alpha (6-keto-PGF1alpha) and NO of different time were measured by enzyme-linked immunosorbent assay and nitrate reductase methods. The peripheral blood mononuclear cells differentiated into EPCs. They presented typical "spindie-shaped" appearance, and they were positively labeled by fluorescent acetylated-LDL, lectin, FLK-1 and vWF. Shear stress enhanced the production of NO and 6-keto-PGF1alpha by EPCs in a dose-dependent manner. Therefore, shear stress increases the secretion of NO and PGI2 by EPC, which suggests that shear stress can improve the antithrombogenic potentials of endothelialized polyurethane small diameter artificial blood vessel.
Yang
Zhen
Z
Department of Cardiology, The First Affiliated Hospital, Guangzhou 510080, China.
Tao
Jun
J
Wang
Jiemei
J
Tu
Chang
C
Feng
Lianqiang
L
Pan
Shirong
S
Ma
Hong
H
D021522:Bioartificial Organs; D001672:Biocompatible Materials / Q000737:chemistry; D001807:Blood Vessel Prosthesis; D002448:Cell Adhesion; D002454:Cell Differentiation; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000166:cytology* / Q000378:metabolism; D011464:Epoprostenol / Q000378:metabolism; D005343:Fibrinolytic Agents / Q000378:metabolism*; D006801:Humans; D066298:In Vitro Techniques; D007963:Leukocytes, Mononuclear / Q000166:cytology; D009569:Nitric Oxide / Q000378:metabolism; D011140:Polyurethanes / Q000737:chemistry*; D013314:Stress, Mechanical
D001672:Biocompatible Materials; D005343:Fibrinolytic Agents; D011140:Polyurethanes; D009569:Nitric Oxide; D011464:Epoprostenol