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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lovett, D. H. Locksley, R. M. Turck, J. Stevenson, F. T. |
| Description | Author Affiliation: Stevenson FT ( Department of Medicine, University of California, Davis, Sacramento 95817, USA.); |
| Abstract | Interleukin 1 alpha (IL-1 alpha) is a pleiotropic cytokine involved in the immune response, inflammatory processes, and hematopoiesis, and acts as a mitogen for several malignant cell types, including acute leukemia and Kaposi sarcoma cells. These diverse activities have been exclusively attributed to the plasma membrane receptor-binding, 17-kDa C-terminal component (mature IL-1 alpha) that results from proteolytic processing of the 31- to 33-kDa precursor protein. No biologic function has been ascribed to the unusually large, 16-kDa N-terminal propiece formed as a result of proteolytic processing of IL-1 alpha. We report that the IL-1 alpha N-terminal propiece is concentrated by means of a nuclear localization sequence within the nuclei of both transfected and leukemic cell lines. Overexpression of this component in glomerular mesangial cells, a model perivascular myofibroblast cell type capable of IL-1 alpha synthesis and processing, results in malignant transformation to a spindle cell-type tumor. The functionally bipartite nature of the IL-1 alpha precursor represents a unique combination of the C-terminal, classical cytokine and an N-terminal nuclear oncoprotein. These findings suggest that nuclear transport of the IL-1 alpha N-terminal component may represent a critical component in the transformation of IL-1 alpha-producing cells in the bone marrow or the perivascular area to a malignant phenotype. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 2 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Interleukin-1 Chemistry Nuclear Proteins Physiology Proto-Oncogene Proteins Amino Acid Sequence Animals Cell Compartmentation Cytosol Metabolism Fluorescent Antibody Technique, Indirect Kidney Glomerulus Molecular Sequence Data Peptide Fragments Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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