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Biochem Biophys Res Commun. 1999 Aug 11;261(3):864-9.

Isolation of differentially expressed cDNAs from p53-dependent apoptotic cells: activation of the human homologue of the Drosophila peroxidasin gene.

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Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, 02115, USA.


Inactivation of the p53 tumor suppressor protein has been observed in a large number of human cancers. Overexpression of p53 induces either growth arrest or programmed cell death (apoptosis). The growth arrest function of p53 is mediated by induction of p21 (WAF1/CIP1), but the mechanisms underlying p53-dependent apoptosis are still largely unknown. To investigate these mechanisms, we have identified six differentially expressed transcripts in a human colon cancer cell line undergoing p53-dependent apoptosis. One of the p53-responsive genes showed significant homology to Drosophila peroxidasin, an extracellular matrix-associated peroxidase, and is likely to be its human homologue. Our results suggest a possible connection between p53-dependent apoptosis and the production of reactive oxygen species.

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