Tumor suppressor Pdcd4 is a major transcript that is upregulated during in vivo pancreatic islet neogenesis and is expressed in both beta-cell and ductal cell lines

We wished to identify a major transcript that is upregulated during in vivo pancreatic islet neogenesis and examine the expression of the gene in beta and ductal cells. Differential display polymerase chain reaction was used to identify upregulated transcripts after islet neogenesis was stimulated i...

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Veröffentlicht in:Pancreas 2011-01, Vol.40 (1), p.61-66
Hauptverfasser: Ferris, William F, Marriott, Claire E, Ali, Tomader, Landy, Caroline, Campbell, Susan C, Macfarlane, Wendy M
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container_end_page 66
container_issue 1
container_start_page 61
container_title Pancreas
container_volume 40
creator Ferris, William F
Marriott, Claire E
Ali, Tomader
Landy, Caroline
Campbell, Susan C
Macfarlane, Wendy M
description We wished to identify a major transcript that is upregulated during in vivo pancreatic islet neogenesis and examine the expression of the gene in beta and ductal cells. Differential display polymerase chain reaction was used to identify upregulated transcripts after islet neogenesis was stimulated in the rat by brief occlusion of the main pancreatic duct. The expression of this major transcript, namely PDCD4 (programmed cell death gene 4), was measured in beta and ductal cells after stimulation with the incretin hormone glucagon-like peptide 1, mitogenic insulin, the thiazolidinedione rosiglitazone, and by high glucose concentrations. The subcellular location of the protein was also examined. The expression of the Pdcd4 gene in pancreatic beta and ductal cells was found to be stimulated in a comparable manner by either glucagon-like peptide 1, insulin, and by high glucose concentrations. However, intracellular localisation of the PDCD4 protein was shown to be differentially regulated by these stimuli in beta and ductal cells. Furthermore, the thiazolidinedione rosiglitazone specifically upregulates Pdcd4 gene expression in beta cells in a time-dependent manner. This is the first study showing Pdcd4 expression in pancreatic cells. Our data indicate that Pdcd4 expression may be integral in the function of the adult pancreas.
doi_str_mv 10.1097/MPA.0b013e3181f5f1ab
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subjects Animals
Apoptosis Regulatory Proteins - genetics
Apoptosis Regulatory Proteins - metabolism
Cell Line
Female
Glucagon-Like Peptide 1 - pharmacology
Insulin - pharmacology
Insulin-Secreting Cells - metabolism
Islets of Langerhans - physiology
Pancreatic Ducts - metabolism
Protein Transport
Rats
Rats, Wistar
Thiazolidinediones - pharmacology
Transcription, Genetic
Tumor Suppressor Proteins - genetics
Up-Regulation
title Tumor suppressor Pdcd4 is a major transcript that is upregulated during in vivo pancreatic islet neogenesis and is expressed in both beta-cell and ductal cell lines
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