國家衛生研究院 NHRI:Item 3990099045/2094

NHRI > National Institute of Infectious Diseases and Vaccinology > Ih-Jen Su(2002-2015) > Periodical Articles > Item 3990099045/2094

Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/2094

Title:	Endoplasmic reticulum stress stimulates the expression of cyclooxygenase-2 through activation of NF-kappaB and pp38 mitogen-activated protein kinase
Other Titles:	Endoplasmic reticulum stress stimulates the expression of cyclooxygenase-2 through activation of NF-κB and pp38 mitogen-activated protein kinase
Authors:	Hung, JH;Su, IJ;Lei, HY;Wang, HC;Lin, WC;Chang, WT;Huang, WY;Chang, WC;Chang, YS;Chen, CC;Lai, MD
Contributors:	Division of Clinical Research
Abstract:	Expression of mutant proteins or viral infection may interfere with proper protein folding activity in the endoplasmic reticulum (ER). Several pathways that maintain cellular homeostasis were activated in response to these ER disturbances. Here we investigated which of these ER stress-activated pathways induce COX-2 and potentially oncogenesis. Tunicamycin and brefeldin A, two ER stress inducers, increased the expression of COX-2 in ML-1 or MCF-7 cells. Nuclear translocation of NF-kappaB and activation of pp38 MAPK were observed during ER stress. IkappaBalpha kinase inhibitor Bay 11-7082 or IkappaBalpha kinase dominant negative mutant significantly inhibited the induction of COX-2. pp38 MAPK inhibitor SB203580 or eIF2alpha phosphorylation inhibitor 2-aminopurine attenuated the nuclear NF-kappaB DNA binding activity and COX-2 induction. Expression of mutant hepatitis B virus (HBV) large surface proteins, inducers of ER stress, enhanced the expression of COX-2 in ML-1 and HuH-7 cells. Transgenic mice showed higher expression of COX-2 protein in liver and kidney tissue expressing mutant HBV large surface protein in vivo. Similarly, increased expression of COX-2 mRNA was observed in human hepatocellular carcinoma tissue expressing mutant HBV large surface proteins. In ML-1 cells expressing mutant HBV large surface protein, anchorage-independent growth was enhanced, and the enhancement was abolished by the addition of specific COX-2 inhibitors. Thus, ER stress due either to expression of viral surface proteins or drugs can stimulate the expression of COX-2 through the NF-kappaB and pp38 kinase pathways. Our results provide important insights into cellular carcinogenesis associated with latent endoplasmic reticulum stress.
Keywords:	Biochemistry & Molecular Biology
Date:	2004-11-05
Relation:	Journal of Biological Chemistry. 2004 Nov;279(45):46384-46392.
Link to:	http://dx.doi.org/10.1074/jbc.M403568200
JIF/Ranking 2023:	http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1083-351X&DestApp=IC2JCR
Cited Times(WOS):	https://www.webofscience.com/wos/woscc/full-record/WOS:000224832400007
Cited Times(Scopus):	http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=8744260946
Appears in Collections:	[Ih-Jen Su(2002-2015)] Periodical Articles

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