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© Research
Publication : Nature genetics

A RA-dependent, tumour-growth suppressive transcription complex is the target of the PML-RARalpha and T18 oncoproteins

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature genetics - 01 Nov 1999

Zhong S, Delva L, Rachez C, Cenciarelli C, Gandini D, Zhang H, Kalantry S, Freedman LP, Pandolfi PP

Link to Pubmed [PMID] – 10610177

Nat. Genet. 1999 Nov;23(3):287-95

PML and Tif1a are fused to RARA and Braf, respectively, resulting in the production of PML-RARalpha and Tif1alpha-B-Raf (T18) oncoproteins. Here we show that PML, Tif1alpha and RXRalpha/RARalpha function together in a transcription complex that is dependent on retinoic acid (RA). We found that PML acts as a ligand-dependent coactivator of RXRalpha/RARalpha. PML interacts with Tif1alpha and CBP. In Pml-/- cells, the RA-dependent induction of genes such as RARB2 and the ability of Tif1alpha and CBP to act as transcriptional coactivators on RA are impaired. We show that both PML and Tif1alpha are growth suppressors required for the growth-inhibitory activity of RA. T18, similar to PML-RARalpha, disrupts the RA-dependent activity of this complex in a dominant-negative manner resulting in a growth advantage. Our data define a new pathway for the control of cell growth and tumorigenesis, and provide a new model for the pathogenesis of acute promyelocytic leukaemia (APL).

http://www.ncbi.nlm.nih.gov/pubmed/10610177