MCB
Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrowReprints and Permissions
Right arrow Copyright Information
Right arrow Books from ASM Press
Right arrow MicrobeWorld
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Fotedar, R.
Right arrow Articles by Fotedar, A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Fotedar, R.
Right arrow Articles by Fotedar, A.

 Previous Article  |  Next Article 

Mol. Cell. Biol., Feb 1995, 932-942, Vol 15, No. 2
Copyright © 1995, American Society for Microbiology

Activation-induced T-cell death is cell cycle dependent and regulated by cyclin B

R Fotedar, J Flatt, S Gupta, RL Margolis, P Fitzgerald, H Messier and A Fotedar
Institut de Biologie Structurale J.-P. Ebel, Grenoble, France.

Developing thymocytes and some T-cell hybridomas undergo activation- dependent programmed cell death. Although recent studies have identified some critical regulators in programmed cell death, the role of cell cycle regulation in activation-induced cell death in T cells has not been addressed. We demonstrate that synchronized T-cell hybridomas, irrespective of the point in the cell cycle at which they are activated, stop cycling shortly after they reach G2/M. These cells exhibit the diagnostic characteristics of apoptotic cell death. Although p34cdc2 levels are not perturbed after activation of synchronously cycling T cells, cyclin B- and p34cdc2-associated histone H1 kinase activity is persistently elevated. This activation-dependent induction of H1 kinase activity in T cells is associated with a decrease in the phosphotyrosine content of p34cdc2. We also demonstrate that transient inappropriate coexpression of cyclin B with p34cdc2 induces DNA fragmentation in a heterologous cell type. Finally, in T cells, cyclin B-specific antisense oligonucleotides suppress activation- induced cell death but not cell death induced by exposure to dexamethasone. We therefore conclude that a persistent elevation of the level of cyclin B kinase is required for activation-induced programmed T-cell death.


This article has been cited by other articles:




Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
J. Bacteriol. J. Virol. Eukaryot. Cell
Microbiol. Mol. Biol. Rev. Clin. Vaccine Immunol. All ASM Journals

Copyright © 1995 by the American Society for Microbiology. All rights reserved.