Abstract
The fusion protein PML/RARA, associated with acute promyelocytic leukemia behaves as an abnormal retinoic acid (RA) receptor with altered transactivation properties but is still inducible by RA. The chimeric protein is thought to promote leukemogenesis but also paradoxically to mediate the sensitivity to ATRA of APL cells. This has been supported by works reporting that in vitro ATRA resistance is characterized by defects in the RARA/E-domain of PML/RARA. In the present report, we identified a new mutation in the E domain of PML/RARA which is associated with a RA-resistant subline of NB4 cells; NB4-R2. This mutation, identical to the Gln411 mutation found in HL60-R, changes the amino acid Gln903 to an in-phase stop codon, generating a truncated form of PML/RARA which has lost 52 amino acids at its C-terminal end. We have studied the effect of the truncated PML/RARA protein on PML NB formation and RARA and PML/RARA transcriptional activity. We show here that the fusion mutant exerts a dominant negative effect on wild-type PML, PML/RARA and RARA transcription activity. These findings highlight the important role of the RARA E-domain of PML/RARA in mediating RA sensitivity in APL cells.
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Acknowledgements
We thank Prof P Chambon (IGBMC, Illkirsh, France) for providing us with RARA and PML-RARA expression vectors, Prof C Rochette-Egly (IGBMC, Illkirsh, France) for the generous gift of anti-RAR (F) and anti-RARA (D) rabbit polyclonal antisera. Dr P Freemont (ICRF, London, UK) is thanked for the gift of anti-PML antibody. We thank Dr A Saurin for critical reading of the manuscript. GB is the recipient of a fellowship from Association pour la Recherche contre le Cancer (ARC). MF is supported by the Association Claude Bernard. This work was supported by funds from the Institut National de la Santé et de la Recherche Médicale (INSERM), the Centre National de la Recherche Scientifique (CNRS), the Ligue Nationale contre le Cancer, and the Norwegian Research Council (grant to JLR).
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Duprez, E., Benoit, G., Flexor, M. et al. A mutated PML/RARA found in the retinoid maturation resistant NB4 subclone, NB4-R2, blocks RARA and wild-type PML/RARA transcriptional activities. Leukemia 14, 255–261 (2000). https://doi.org/10.1038/sj.leu.2401683
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DOI: https://doi.org/10.1038/sj.leu.2401683
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