Abstract
Dysregulation of cyclin D2 contributes to the pathogenesis of multiple myeloma, and can occur through translocations that activate MAF/MAFB or MMSET/FGFR3. However, cyclin D2 induction can also be seen in the absence of such translocations, such as in patients with hyperdiploid disease, through unknown mechanisms. In UniGene cluster data-mining and ECgene analysis, we found that zinc-finger with KRAB and SCAN domains 3 (ZKSCAN3), a novel transcription factor, is overrepresented in this malignancy, and three consensus ZKSCAN3 binding sites were found in the cyclin D2 promoter. Analysis of a panel of myeloma cell lines, primary patient samples and datasets from Oncomine and the Multiple Myeloma Genomics Portal (MMGP) revealed expression of ZKSCAN3 messenger RNA (mRNA) in a majority of samples. Studies of cell lines by western blotting, and of primary tissue microarrays by immunohistochemistry, showed ZKSCAN3 protein expression in a majority, and in a manner that paralleled messenger levels in cell lines. ZKSCAN3 overexpression was associated with increased gene copy number or genomic DNA gain/amplification in a subset based on analysis of data from the MMGP, and from fluorescence in situ hybridization studies of cell lines and primary samples. Overexpression of ZKSCAN3 induced cyclin D2 promoter activity in a MAF/MAFB-independent manner, and to an extent that was influenced by the number of consensus ZKSCAN3 binding sites. Moreover, ZKSCAN3 protein expression correlated with cyclin D2 levels in cell lines and primary samples, and its overexpression induced cyclin D2. Conversely, ZKSCAN3 suppression using small hairpin RNAs (shRNAs) reduced cyclin D2 levels, and, importantly, inhibited myeloma cell line proliferation. Finally, ZKSCAN3 was noted to specifically bind to oligonucleotides representing sequences from the cyclin D2 promoter, and to the endogenous promoter itself in myeloma cells. Taken together, the data support the conclusion that ZKSCAN3 induction represents a mechanism by which myeloma cells can induce cyclin D2 dysregulation, and contribute to disease pathogenesis.
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Acknowledgements
We wish to thank Dr Douglas Boyd for his contributions to the studies of the role of ZKSCAN3 in colon cancer. RZO, a Leukemia & Lymphoma Society Scholar in Clinical Research, would like to acknowledge support from the Leukemia & Lymphoma Society (6096-07) and the National Cancer Institute (R01 CA102278).
Authorship: LY designed and performed the research presented herein, and wrote the paper. HW aided in performing Lentiviral experiments. SK, DAG, JAM, MW, DMW, SKT and JJS were involved in patient sample acquisition, including in the consenting of patients, and later purification and storage of their plasma cells. NZ, LZ, SYY and KAB performed bioinformatics analyses, whereas GL, MZ and RM performed FISH studies. RZO supervised the design and performance of all of the research contained herein, and contributed to the writing and editing of the paper.
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Yang, L., Wang, H., Kornblau, S. et al. Evidence of a role for the novel zinc-finger transcription factor ZKSCAN3 in modulating Cyclin D2 expression in multiple myeloma. Oncogene 30, 1329–1340 (2011). https://doi.org/10.1038/onc.2010.515
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DOI: https://doi.org/10.1038/onc.2010.515
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