Abstract
Background
The retinoblastoma-interacting zinc-finger gene RIZ is expressed in two forms (RIZ1 and RIZ2) that differ for the presence near the N-terminus of RIZ1 of a conserved domain, defined PR (PRDI-BF1-RIZ homology), homologous to a similar domain present in other proteins recognized as tumor suppressor gene products. The RIZ1 form is usually absent or expressed at low levels in tumor cells, whereas RIZ2 is frequently expressed. We investigated a possible involvement of RIZ1 in differentiation control using a myeloid cell maturation model that is easily modulated by retinoids and other agents.
Materials and Methods
HL60 or NB4 cell lines or patients’ leukemic promyelocytes were treated with all-trans-retinoic acid or other agents to induce differentiation. RIZ gene expression was determined with reverse transcriptase polymerase chain reaction (RT-PCR) and RNase protection assay. Immunocytochemistry was performed to assess variation of the intracellular distribution of RIZ protein on all-trans-retinoic acid treatment. Forced expression of RIZ1 protein was obtained with a recombinant adenovirus containing RIZ1 cDNA.
Results
Treatment with retinoic acid induced a selective expression of RIZ1 in HL60 cell line. Retinoic acid effect was maximal at 7 days and correlated to the granulocytic differentiation of cells. A similar effect was obtained in retinoic acid-sensitive NB4 cell line or in patients’ leukemic promyelocytes, but not in the retinoic acid-resistant cell line NB4.007/6 or in the U937 cell line. Selective expression of RIZ1 was also induced by 12-O-tetradecanoyl-phorbol-13-acetate in the U937 and HL60 cell lines and by 1,25-dihydroxyvitamin D3 only in HL60 cells. In HL60 cells, RIZ1 was also induced by activation of a retinoid α receptor-independent maturation pathway based on retinoid X receptor agonist and protein kinase A synergism. In addition, retinoic acid produced a redistribution of the antigen within the nucleus in these cells. Forced expression of RIZ1 protein induced growth arrest and death of HL60 cells.
Conclusions
The correlation between the selective expression of RIZ1 induced by retinoic acid, 12-O-tetradecanoyl-phorbol-13-acetate, or 1,25-dihydroxyvitamin D3 and differentiation suggested that RIZ protein was involved in myeloid cell differentiation induced by these agents.
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Acknowledgments
We thank Dr. She Huang (The Burnham Institute, La Jolla, CA, USA) for providing the AdRIZ1 and AdGFP adenovirus vectors, Dr. Mirco Fanelli (Istituto Europeo di Oncologia, Milano, Italy) for the NB4.007/6 cell line, and Dr. Saverio Minucci (Istituto Europeo di Oncologia, Milano, Italy) for helpful discussions.
This investigation was supported by the Italian Ministry for University and Scientific and Technological Research.
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P. G. and P. B. equally contributed to the work.
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Gazzerro, P., Bontempo, P., Schiavone, E.M. et al. Differentiation of Myeloid Cell Lines Correlates with a Selective Expression of RIZ Protein. Mol Med 7, 552–560 (2001). https://doi.org/10.1007/BF03401861
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DOI: https://doi.org/10.1007/BF03401861