Abstract:
:Promyelocytic leukemia (PML) nuclear bodies (PML NBs) are discrete subnuclear domains organized by the promyelocytic leukemia protein PML, a tumor suppressor essential for multiple apoptotic pathways. We have recently described a novel family of cellular factors, the THAP proteins, characterized by the presence at their amino-terminus of an evolutionary conserved putative DNA-binding motif, designated THAP domain. Here, we report that THAP1 is a novel nuclear proapoptotic factor associated with PML NBs, which potentiates both serum withdrawal- and TNF alpha-induced apoptosis, and interacts with prostate-apoptosis-response-4 (Par-4), a well characterized proapoptotic factor, previously linked to prostate cancer and neurodegenerative diseases. We show that endogenous Par-4 colocalizes with ectopic THAP1 within PML NBs in primary endothelial cells and fibroblasts. In addition, we found that Par-4 is a component of PML NBs in blood vessels, a major site of PML expression in vivo. Finally, we investigated the role of the THAP domain in THAP1 activities and found that this putative DNA-binding domain is not required for Par-4 binding and localization within PML NBs, but is essential for THAP1 proapoptotic activity. Together, our results provide an unexpected link between a nuclear factor of the THAP family, the proapoptotic protein Par-4 and PML nuclear bodies.
journal_name
Oncogenejournal_title
Oncogeneauthors
Roussigne M,Cayrol C,Clouaire T,Amalric F,Girard JPdoi
10.1038/sj.onc.1206271subject
Has Abstractpub_date
2003-04-24 00:00:00pages
2432-42issue
16eissn
0950-9232issn
1476-5594pii
1206271journal_volume
22pub_type
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