Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/28022
Type: | Journal article |
Title: | Intracellular and extracellular leukemia inhibitory factor proteins have different cellular activities that are mediated by distinct protein motifs |
Author: | Haines, Bryan Peter Voyle, Roger Bruce Rathjen, Peter David |
Citation: | Molecular Biology of the Cell, 2000; 11(4):1369-1383 |
Publisher: | American Society for Cell Biology |
Issue Date: | 2000 |
ISSN: | 1059-1524 |
School/Discipline: | School of Molecular and Biomedical Science |
Organisation: | Centre for the Molecular Genetics of Development |
Abstract: | Although many growth factors and cytokines have been shown to be localized within the cell and nucleus, the mechanism by which these molecules elicit a biological response is not well understood. The cytokine leukemia inhibitory factor (LIF) provides a tractable experimental system to investigate this problem, because translation of alternatively spliced transcripts results in the production of differentially localized LIF proteins, one secreted from the cell and acting via cell surface receptors and the other localized within the cell. We have used overexpression analysis to demonstrate that extracellular and intracellular LIF proteins can have distinct cellular activities. Intracellular LIF protein is localized to both nucleus and cytoplasm and when overexpressed induces apoptosis that is inhibited by CrmA but not Bcl-2 expression. Mutational analysis revealed that the intracellular activity was independent of receptor interaction and activation and reliant on a conserved leucine-rich motif that was not required for activation of cell surface receptors by extracellular protein. This provides the first report of alternate intracellular and extracellular cytokine activities that result from differential cellular localization of the protein and are mediated by spatially distinct motifs. |
Rights: | Copyright © 2000 by The American Society for Cell Biology |
Published version: | http://www.molbiolcell.org/cgi/content/abstract/11/4/1369 |
Appears in Collections: | Centre for the Molecular Genetics of Development publications Molecular and Biomedical Science publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.