Please use this identifier to cite or link to this item: http://ahro.austin.org.au/austinjspui/handle/1/12005
Title: Zinc ions upregulate the hormone gastrin via an E-box motif in the proximal gastrin promoter.
Authors: Xiao, Lin;Kovac, Suzana;Chang, Mike;Shulkes, Arthur;Baldwin, Graham S;Patel, Oneel
Affiliation: Department of Surgery, Austin Health, The University of Melbourne, Studley Road, Heidelberg, Victoria 3084, Australia.
Issue Date: 20-Dec-2013
Citation: Journal of Molecular Endocrinology 2013; 52(1): 29-42
Abstract: Gastrin and its precursors act as growth factors for the normal and neoplastic gastrointestinal mucosa. As the hypoxia mimetic cobalt chloride upregulates the gastrin gene, the effect of other metal ions on gastrin promoter activity was investigated. Gastrin mRNA was measured by real-time PCR, gastrin peptides by RIA, and gastrin promoter activity by dual-luciferase reporter assay. Exposure to Zn(2)(+) ions increased gastrin mRNA concentrations in the human gastric adenocarcinoma cell line AGS in a dose-dependent manner, with a maximum stimulation of 55 ± 14-fold at 100 μM (P<0.05). Significant stimulation was also observed with Cd(2)(+) and Cu(2)(+), but not with Ca(2)(+), Mg(2)(+), Ni(2)(+), or Fe(3)(+) ions. Activation of MAPK and phosphatidylinositol 3-kinase pathways is necessary but not sufficient for gastrin induction by Zn(2)(+). Deletional mutation of the gastrin promoter identified an 11 bp DNA sequence, which contained an E-box motif, as necessary for Zn(2)(+)-dependent gastrin induction. The fact that E-box binding transcription factors play a crucial role in the epithelial-mesenchymal transition (EMT), together with our observation that Zn(2)(+) ions upregulate the gastrin gene in AGS cells by an E-box-dependent mechanism, suggests that Zn(2)(+) ions may induce an EMT, and that gastrin may be involved in the transition.
Internal ID Number: 24363439
URI: http://ahro.austin.org.au/austinjspui/handle/1/12005
DOI: 10.1530/JME-13-0162
URL: http://www.ncbi.nlm.nih.gov/pubmed/24363439
Type: Journal Article
Subjects: E-box
MAPK
PI3K
cadmium
cobalt
gastrin
iron
promoter
transcription
zinc
Animals
Cadmium.pharmacology
Cell Line, Tumor
E-Box Elements
Gastrins.genetics.metabolism
Gene Expression Regulation.drug effects
Humans
Mice
Mitogen-Activated Protein Kinases.metabolism
Phosphatidylinositol 3-Kinases.metabolism
Promoter Regions, Genetic
Receptors, G-Protein-Coupled.metabolism
Signal Transduction
Transcriptional Activation.drug effects
Zinc.pharmacology
Appears in Collections:Journal articles

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