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Down-regulation of genes related to the adrenergic system may contribute to splanchnic vasodilation in rat portal hypertension.

Authors: Coll, M  Genesca, J  Raurell, I  Rodriguez-Vilarrupla, A  Mejias, M  Otero, T  Oria, M  Esteban, R  Guardia, J  Bosch, J  Martell, M 
Citation: Coll M, etal., J Hepatol. 2008 Jul;49(1):43-51. Epub 2008 Apr 18.
Pubmed: (View Article at PubMed) PMID:18457899
DOI: Full-text: DOI:10.1016/j.jhep.2008.03.015

BACKGROUND/AIMS: Splanchnic vasodilation initiates the hyperdynamic syndrome in portal hypertension. We aimed to explore molecular mechanisms involved in the development of mesenteric vasodilation in portal hypertension. METHODS: Superior mesenteric artery (SMA) samples from portal vein ligated (PVL) and sham rats were compared in a time course experiment using DNA microarrays. Selected genes were quantified by qRT-PCR in PVL and cirrhotic rats. Inmunohistochemistry of tyrosine hydroxylase (Th) and norepinephrine was assessed in SMA sections of PVL and sham rats. Western blot analysis of Th, dopamine beta-hydroxylase (Dbh) and synaptosome-associated protein (Snap-25) was performed in SMA and jejunum samples from the animal models. RESULTS: Fifty differentially expressed genes implicated in neurotransmission, especially adrenergic, were detected in SMA samples from PVL rats. Sequential analysis showed a profound down-regulation at 14 days in PVL rats. These down-regulated genes were confirmed by RT-PCR in SMA from PVL and cirrhotic rats. Th and NE detection by immunohistochemistry was reduced in PVL compared to sham. Th, Dbh and Snap-25 expression was lower in SMA from 14-day PVL and cirrhotic rats compared to sham and control rats, respectively. CONCLUSIONS: Genetic down-regulation of genes related to the adrenergic system might have a role in splanchnic vasodilation of portal hypertension.


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CRRD Object Information
CRRD ID: 5129683
Created: 2011-04-05
Species: All species
Last Modified: 2011-04-05
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.