Overexpression of apelin receptor (APJ/AGTRL1) on hepatic stellate cells and sinusoidal angiogenesis in human cirrhotic liver.

Abstract:

BACKGROUND:The apelin receptor (APJ) is related to angiotensin-like-receptor 1 (AGTRL1). This study was designed to elucidate the in vivo localization and changes of APJ in cirrhotic liver, and the in vitro changes of APJ expression in cultured hepatic stellate cells (HSCs) and capillarized sinusoidal endothelial cells (SECs) activated by growth factors. METHODS:In vivo studies used control liver samples, cirrhotic liver samples from patients with Child's A cirrhosis undergoing surgical resection (Child-A-LC), and cirrhotic liver samples from autopsied cases of decompensated Child's C cirrhosis (Child-C-LC). Immunohistochemical (IHC), Western blot, laser-capture microdissection (LCM) coupled with reverse transcription -polymerase chain reaction (RT-PCR), and immunoelectron microscopic (IEM) studies for APJ expression were conducted. In vitro examinations used commercial human HSCs and SECs. APJ expression was examined in cultured HSCs activated by growth factors and in capillarized SECs activated by angiogenic factors. RESULTS:The IHC study of liver samples revealed only slight APJ expression in hepatic sinusoids in control liver tissue. In cirrhotic liver (Child-A-LC and Child-C-LC), APJ expression was evident mainly along the sinusoids and on portal fibroblasts in fibrotic septa. Western blot analysis of whole-liver homogenate and LCM-PCR of sinusoids revealed overexpression of APJ in Child-C-LC samples. The results of IEM studies showed that APJ expression was increased significantly on HSCs, but it was sparse on SECs in Child-C-LC tissue. In vitro examination revealed that APJ was overexpressed in cultured HSCs activated by platelet-derived growth factor-β. CONCLUSIONS:Enhanced expression of APJ on HSCs in cirrhosis indicates markedly increased vascular remodeling.

journal_name

J Gastroenterol

authors

Yokomori H,Oda M,Yoshimura K,Machida S,Kaneko F,Hibi T

doi

10.1007/s00535-010-0296-3

subject

Has Abstract

pub_date

2011-02-01 00:00:00

pages

222-31

issue

2

eissn

0944-1174

issn

1435-5922

journal_volume

46

pub_type

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