Document Detail


Glycine-extended gastrin inhibits apoptosis in Barrett's oesophageal and oesophageal adenocarcinoma cells through JAK2/STAT3 activation.
MedLine Citation:
PMID:  19153190     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Barrett's oesophagus (BO) and oesophageal adenocarcinoma (OAC) are regarded as complications of gastro-oesophageal reflux disease, although all the factors that contribute to the development of these lesions are unknown. Acid suppressive drugs are widely used for symptomatic therapy of reflux disease but may induce hypersecretion of gastrin peptides. Amidated gastrin (G-17) has been shown to be a growth factor for OAC cells. We have examined the effects of glycine-extended gastrin (G-Gly), an alternative product of progastrin processing on apoptosis in the QhERT Barrett's oesophageal cell line and OE33 and BIC-1 OAC cells. G-Gly inhibited serum-starvation and camptothecin-induced apoptosis in all three cell lines, G-17 was only effective in OE33 cells. By contrast to the effects of G-17, the anti-apoptotic effect of G-Gly was independent of both the CCK(2) receptor and cyclo-oxygenase-2 activity. G-Gly stimulated JAK2 phosphorylation and kinase activity and JAK2-dependent STAT3 phosphorylation and transcriptional activity. G-Gly also increased mRNA and protein levels of the anti-apoptotic proteins survivin and BCL2L1 but did not affect the levels of BAD, BAX or BCL-2. Novel small molecule inhibitors of JAK2 and STAT3 as well as STAT3 siRNA blocked the anti-apoptotic effects of G-Gly and inhibited the induction of survivin and BCL2L1 in OE33 cells. We conclude that G-Gly inhibits apoptosis in BO and OAC via mechanisms distinct from those activated by G-17 and involving JAK2 and STAT3 activation. Release of gastrin peptides in response to acid suppressive therapy may adversely influence the dynamics of the epithelium in BO.
Authors:
Ian L P Beales; Olorunseun O Ogunwobi
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-01-19
Journal Detail:
Title:  Journal of molecular endocrinology     Volume:  42     ISSN:  1479-6813     ISO Abbreviation:  J. Mol. Endocrinol.     Publication Date:  2009 Apr 
Date Detail:
Created Date:  2009-03-20     Completed Date:  2009-06-22     Revised Date:  2012-06-05    
Medline Journal Info:
Nlm Unique ID:  8902617     Medline TA:  J Mol Endocrinol     Country:  England    
Other Details:
Languages:  eng     Pagination:  305-18     Citation Subset:  IM    
Affiliation:
Gastroenterology Department, Norfolk and Norwich University Hospital, Norwich, UK. i.beales@uea.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Adenocarcinoma / enzymology,  pathology*
Apoptosis / drug effects*
Barrett Esophagus / enzymology,  pathology*
Cell Line, Tumor
Cyclooxygenase Inhibitors / pharmacology
Enzyme Activation / drug effects
Esophageal Neoplasms / enzymology,  pathology*
Gastrins / pharmacology*
Humans
Janus Kinase 2 / metabolism*
RNA Interference / drug effects
RNA, Small Interfering / metabolism
Receptors, Cholecystokinin / antagonists & inhibitors
STAT3 Transcription Factor / metabolism*
Signal Transduction / drug effects
Chemical
Reg. No./Substance:
0/Cyclooxygenase Inhibitors; 0/Gastrins; 0/RNA, Small Interfering; 0/Receptors, Cholecystokinin; 0/STAT3 Transcription Factor; 0/STAT3 protein, human; 0/glycine-extended gastrin 17; EC 2.7.10.1/Janus Kinase 2; EC 2.7.10.2/JAK2 protein, human

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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