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Molecular and Cellular Biology, January 2000, p. 233-241, Vol. 20, No. 1
0270-7306/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

ei24, a p53 Response Gene Involved in Growth Suppression and Apoptosis

Zhengming Gu,1 Cathy Flemington,2 Thomas Chittenden,2 and Gerard P. Zambetti1,3,*

Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, Tennessee 381051; Department of Biochemistry, University of Tennessee, Memphis Tennessee 381633; and Apoptosis Technology, Inc., Cambridge, Massachusetts 021392

Received 26 August 1999/Returned for modification 24 September 1999/Accepted 7 October 1999

DNA damage and/or hyperproliferative signals activate the wild-type p53 tumor suppressor protein, which induces a G1 cell cycle arrest or apoptosis. Although the mechanism of p53-mediated cell cycle arrest is fairly well defined, the p53-dependent pathway regulating apoptosis is poorly understood. Here we report the functional characterization of murine ei24 (also known as PIG8), a gene directly regulated by p53, whose overexpression negatively controls cell growth and induces apoptotic cell death. Ectopic ei24 expression markedly inhibits cell colony formation, induces the morphological features of apoptosis, and reduces the number of beta -galactosidase-marked cells, which is efficiently blocked by coexpression of Bcl-XL. The ei24/PIG8 gene is localized on human chromosome 11q23, a region frequently altered in human cancers. These results suggest that ei24 may play an important role in negative cell growth control by functioning as an apoptotic effector of p53 tumor suppressor activities.

* Corresponding author. Mailing address: Department of Biochemistry, St. Jude Children's Research Hospital, 332 North Lauderdale, Memphis, TN 38105. Phone: (901) 495-3429. Fax: (901) 525-8025. E-mail: gerard.zambetti{at}stjude.org.

Molecular and Cellular Biology, January 2000, p. 233-241, Vol. 20, No. 1
0270-7306/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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