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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Gilman, M. Z. Riabowol, K. Schiff, J. |
| Description | Author Affiliation: Riabowol K ( Cold Spring Harbor Laboratory, NY 11724.); |
| Abstract | Activation of the AP-1 complex of transcription factors is one of the earliest nuclear responses to mitogenic stimuli. We demonstrate directly that AP-1 activity is required for human cells to proliferate in response to serum. We also find that activity of the AP-1 complex is selectively reduced in old human fibroblasts prior to their entering a fully senescent state. Levels of Fos protein induced through diverse signal transduction pathways, the amount of AP-1 DNA binding activity in vitro, and the activity of an AP-1-dependent reporter gene in vivo are substantially decreased as fibroblasts age. Moreover, the composition of the AP-1 complex changes, so that old cells produce predominantly Jun-Jun homodimers instead of Fos-Jun heterodimers. Changes in AP-1 activity may be due in part to changes in posttranslational modification of Fos protein that impair its ability to form active DNA-binding heterodimers with Jun. These data suggest that changes in AP-1 activity may contribute to the inability of senescent cells to proliferate in response to mitogens. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 1 |
| Volume Number | 89 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1992-02-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Aging Cell Cycle Proto-Oncogene Proteins C-fos Physiology Proto-Oncogene Proteins C-jun Cells, Cultured Growth Substances Pharmacology Isoelectric Point Molecular Sequence Data Oligodeoxyribonucleotides Chemistry Regulatory Sequences, Nucleic Acid Transcription, Genetic Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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