alexa Requirement of the p38 mitogen-activated protein kinase signalling pathway for the induction of the 78 kDa glucose-regulated protein immunoglobulin heavy-chain binding protein by azetidine stress: activating transcription factor 6 as a target for stress-i
Pharmaceutical Sciences

Pharmaceutical Sciences

Biochemistry & Pharmacology: Open Access

Author(s): Luo S, Lee AS

Abstract Share this page

Abstract Malfolded protein formation and perturbance of calcium homoeostasis results in the induction of the endoplasmic reticulum (ER) chaperone protein, namely the 78 kDa glucose-regulated protein (GRP78)/immunoglobulin heavy-chain binding protein. Various ER stress inducers can activate grp78, but signal transduction mechanisms are not well understood. We report in the present study that the induction of endogenous grp78 mRNA by the amino acid analogue azetidine (AzC) requires the integrity of a signal transduction pathway mediated by p38 mitogen-activated protein kinase (p38 MAPK). In contrast, induction of grp78 by thapsigargin that depletes the ER calcium storage can occur even when the p38 MAPK pathway is blocked. Treatment of cells with AzC results in the sustained activation of p38 MAPK. We identified an ER transmembrane activating transcription factor 6 (ATF6) as a target of p38 MAPK phosphorylation in AzC-treated cells. ATF6 undergoes proteolytic cleavage on AzC treatment, releasing a nuclear form that is an activator of the grp78 promoter. We show here that constitutively active mitogen-activated protein kinase kinase 6, a selective p38 MAPK activator, enhances the ability of the nuclear form of ATF6 to transactivate the grp78 promoter. Our results provide direct evidence that different ER stress inducers use diverse pathways to activate grp78 and that in addition to activation by proteolytic cleavage, ATF6 undergoes specific ER stress-induced phosphorylation. We propose that phosphorylation of ATF6 is a novel mechanism for augmenting its potential as a transcription activator.
This article was published in Biochem J and referenced in Biochemistry & Pharmacology: Open Access

Relevant Expert PPTs

Relevant Speaker PPTs

Recommended Conferences

Relevant Topics

OMICS International Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

Agri, Food, Aqua and Veterinary Science Journals

Dr. Krish

agrifoodaquavet@omicsonline.com

1-702-714-7001 Extn: 9040

Clinical and Biochemistry Journals

Datta A

clinical_biochem@omicsonline.com

1-702-714-7001Extn: 9037

Business & Management Journals

Ronald

business@omicsonline.com

1-702-714-7001Extn: 9042

Chemical Engineering and Chemistry Journals

Gabriel Shaw

chemicaleng_chemistry@omicsonline.com

1-702-714-7001 Extn: 9040

Earth & Environmental Sciences

Katie Wilson

environmentalsci@omicsonline.com

1-702-714-7001Extn: 9042

Engineering Journals

James Franklin

engineering@omicsonline.com

1-702-714-7001Extn: 9042

General Science and Health care Journals

Andrea Jason

generalsci_healthcare@omicsonline.com

1-702-714-7001Extn: 9043

Genetics and Molecular Biology Journals

Anna Melissa

genetics_molbio@omicsonline.com

1-702-714-7001 Extn: 9006

Immunology & Microbiology Journals

David Gorantl

immuno_microbio@omicsonline.com

1-702-714-7001Extn: 9014

Informatics Journals

Stephanie Skinner

omics@omicsonline.com

1-702-714-7001Extn: 9039

Material Sciences Journals

Rachle Green

materialsci@omicsonline.com

1-702-714-7001Extn: 9039

Mathematics and Physics Journals

Jim Willison

mathematics_physics@omicsonline.com

1-702-714-7001 Extn: 9042

Medical Journals

Nimmi Anna

medical@omicsonline.com

1-702-714-7001 Extn: 9038

Neuroscience & Psychology Journals

Nathan T

neuro_psychology@omicsonline.com

1-702-714-7001Extn: 9041

Pharmaceutical Sciences Journals

John Behannon

pharma@omicsonline.com

1-702-714-7001Extn: 9007

Social & Political Science Journals

Steve Harry

social_politicalsci@omicsonline.com

1-702-714-7001 Extn: 9042

 
© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version