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J. Biol. Chem., Vol. 276, Issue 2, 1127-1132, January 12, 2001

This Article Full Text Full Text (PDF) All Versions of this Article: 276/2/1127    most recent M006944200v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Doostzadeh-Cizeron, J. Articles by Goodrich, D. W. Search for Related Content PubMed PubMed Citation Articles by Doostzadeh-Cizeron, J. Articles by Goodrich, D. W. Social Bookmarking                      What's this?

The Nuclear Death Domain Protein p84N5 Activates a G₂/M Cell Cycle Checkpoint Prior to the Onset of Apoptosis^*

Jaleh Doostzadeh-Cizeron, Nicholas H. A. Terry^§, and David W. Goodrich^¶

From the  Department of Molecular and Cellular Oncology and the ^§ Department of Experimental Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030

In contrast to extracellular signals, the mechanisms utilized to transduce nuclear apoptotic signals are not well understood. Characterizing these mechanisms is important for predicting how tumors will respond to genotoxic radiation or chemotherapy. The retinoblastoma (Rb) tumor suppressor protein can regulate apoptosis triggered by DNA damage through an unknown mechanism. The nuclear death domain-containing protein p84N5 can induce apoptosis that is inhibited by association with Rb. The pattern of caspase and NF-B activation during p84N5-induced apoptosis is similar to p53-independent cellular responses to DNA damage. One hallmark of this response is the activation of a G₂/M cell cycle checkpoint. In this report, we characterize the effects of p84N5 on the cell cycle. Expression of p84N5 induces changes in cell cycle distribution and kinetics that are consistent with the activation of a G₂/M cell cycle checkpoint. Like the radiation-induced checkpoint, caffeine blocks p84N5-induced G₂/M arrest but not subsequent apoptotic cell death. The p84N5-induced checkpoint is functional in ataxia telangiectasia-mutated kinase-deficient cells. We conclude that p84N5 induces an ataxia telangiectasia-mutated kinase (ATM)-independent, caffeine-sensitive G₂/M cell cycle arrest prior to the onset of apoptosis. This conclusion is consistent with the hypotheses that p84N5 functions in an Rb-regulated cellular response that is similar to that triggered by DNA damage.

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