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Deoxyhypusine synthase (DHPS) inhibitor GC7 induces p21/Rb-mediated inhibition of tumor cell growth and DHPS expression correlates with poor prognosis in neuroblastoma patients

Authors :
André S. Bachmann
Andrea Bandino
Jan Koster
Dirk Geerts
Other departments
Oncogenomics
Hematology laboratory
Source :
Cellular oncology (Dordrecht), 37(6), 387-398. IOS Press, Cellular Oncology, 37(6), 387-98. IOS Press, Bandino, A, Geerts, D, Koster, J & Bachmann, A S 2014, ' Deoxyhypusine synthase (DHPS) inhibitor GC7 induces p21/Rb-mediated inhibition of tumor cell growth and DHPS expression correlates with poor prognosis in neuroblastoma patients ', Cellular Oncology, vol. 37, no. 6, pp. 387-98 . https://doi.org/10.1007/s13402-014-0201-9
Publication Year :
2014
Publisher :
Springer Science and Business Media LLC, 2014.

Abstract

PURPOSE: Neuroblastoma (NB) is an aggressive pediatric malignancy that typically occurs in infants and children under the age of 5 years. High-stage tumors relapse frequently even after aggressive multimodal treatment, resulting in therapy resistance and eventually in patient death. Clearly, new biologically-targeted drugs are needed that more efficiently suppress tumor growth and prevent relapse. We and others previously showed that polyamines such as spermidine play an essential role in NB tumorigenesis and that DFMO, an inhibitor of the central polyamine synthesis gene ODC, is effective in vitro and in vivo, prompting its evaluation in NB clinical trials. However, the specific molecular actions of polyamines remain poorly defined. Spermidine and deoxyhypusine synthase (DHPS) are essential components in the hypusination-driven post-translational activation of eukaryotic initiation factor 5A (eIF5A).METHODS: We assessed the role of DHPS in NB and the impact of its inhibition by N(1)-guanyl-1,7-diaminoheptane (GC7) on tumor cell growth using cell proliferation assays, Western blot, immunofluorescence microscopy, and Affymetrix micro-array mRNA expression analyses in NB tumor samples.RESULTS: We found that GC7 inhibits NB cell proliferation in a dose-dependent manner, through induction of the cell cycle inhibitor p21 and reduction of total and phosphorylated Rb proteins. Strikingly, high DHPS mRNA expression correlated significantly with unfavorable clinical parameters, including poor patient survival, in a cohort of 88 NB tumors (all P CONCLUSIONS: These results suggest that spermidine and DHPS are key contributing factors in NB tumor proliferation through regulation of the p21/Rb signaling axis.

Details

ISSN :
22113436, 22113428, and 18758606
Volume :
37
Database :
OpenAIRE
Journal :
Cellular Oncology
Accession number :
edsair.doi.dedup.....1914a4989f7fee8544ffa4dd4f885c08
Full Text :
https://doi.org/10.1007/s13402-014-0201-9