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Gastroenterology Research and Practice
Volume 2015, Article ID 545018, 7 pages
http://dx.doi.org/10.1155/2015/545018
Research Article

Effect of Fluid Shear Stress on Portal Vein Remodeling in a Rat Model of Portal Hypertension

Ruikang Hospital, Guangxi Chinese Medicine University, Nanning, Guangxi 530011, China

Received 26 December 2014; Revised 2 March 2015; Accepted 12 March 2015

Academic Editor: Fabio Marra

Copyright © 2015 Bin Wen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Aims. To explore the effects and mechanisms of fluid shear stress on portal vein remodeling in a rat model of portal hypertension. Methods. Subcutaneous injections of CCl4 were given to establish a rat model of liver cirrhosis and portal hypertension. Biomechanical technology was adopted to determine the dynamic changes of haemodynamic indices and fluid shear stress. Nitric oxide (NO), synthase (NOS), and endothelin-1 (ET-1) of the portal vein blood were measured. Changes in geometric structure and ultrastructure of the portal vein were observed using optical and electron microscopy. Results. After the CC14 injections, rat haemodynamics were notably altered. From week 4 onwards, PVP, PVF, and PVR gradually and significantly increased ( versus baseline). The fluid shear stress declined from week 4 onwards ( versus control group). NO, NOS, and ET-1 increased after repeated CCI4 injections. Hematoxylin and eosin staining showed thickened portal vein walls, with increased inside and outside diameters. Electron microscopy revealed different degrees of endothelial cell degeneration, destruction of basement membrane integrity, proliferating, and hypertrophic smooth muscle cells. Conclusions. Fluid shear stress not only influenced the biomechanical environment of the portal vein but also participated in vascular remodeling.