Document Detail


Upregulation of β1-adrenoceptors is involved in the formation of gastric dysmotility in the 6-hydroxydopamine rat model of Parkinson's disease.
MedLine Citation:
PMID:  24467967     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Gastrointestinal dysmotility is one of the nonmotor symptoms of Parkinson's disease (PD). Gastroparesis and upregulated β-adrenoceptors (β-ARs) have been reported in rats with bilateral microinjection of 6-hydroxydopamine (6-OHDA) in the substantia nigra, but the underlying mechanism is unclear. The aim of the current study is to investigate the role of β-ARs in gastroparesis in 6-OHDA rats. Gastric motility was studied through strain gauge measurement. Immunofluorescence, real-time reverse transcription-polymerase chain reaction and Western blotting were performed to examine the expression of β-ARs. Norepinephrine (NE) inhibited gastric motility in a dose-dependent fashion in both control and 6-OHDA rats, but much stronger adrenergic reactivity was observed in the 6-OHDA rats. The inhibition of gastric motility by NE in both control and 6-OHDA rats was not affected by tetrodotoxin, a neural sodium channel blocker. Blocking β1-AR or β2-AR did not affect the inhibition of strip contraction by NE in control rats, but β1-AR blockage obviously enhanced the half maximal inhibitory concentration value of NE in 6-OHDA rats. Selective inhibition of β3-AR blocked the effect of NE significantly in both control and 6-OHDA rats. The protein expression of β1-AR, but not β2-AR and β3-AR in gastric muscularis externa was increased significantly in 6-OHDA rats. In conclusion, β3-AR involves the regulation of gastric motility in control rats, whereas the upregulation of β1-AR is responsible for enhanced NE reactivity in 6-OHDA rats and therefore is involved in the formation of gastroparesis. The effect of both β1-AR and β3-AR on gastric motility is independent of the enteric nervous system.
Authors:
Jin Song; Lifei Zheng; Xiaoli Zhang; Xiaoyan Feng; Ruifang Fan; Lu Sun; Feng Hong; Yue Zhang; Jinxia Zhu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-1-7
Journal Detail:
Title:  Translational research : the journal of laboratory and clinical medicine     Volume:  -     ISSN:  1878-1810     ISO Abbreviation:  Transl Res     Publication Date:  2014 Jan 
Date Detail:
Created Date:  2014-1-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101280339     Medline TA:  Transl Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Mosby, Inc. All rights reserved.
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