Early and late effects of pharmacological ALK inhibition on the neuroblastoma transcriptome
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Shana Claeys1,2, Geertrui Denecker1,2, Robrecht Cannoodt1,2,3,4,5, Candy Kumps1,6, Kaat Durinck1,2, Frank Speleman1,2 and Katleen De Preter1,2
1Center for Medical Genetics, Ghent University, Ghent, Belgium
2Cancer Research Institute Ghent, Ghent University, Ghent, Belgium
3Bioinformatics Institute Ghent From Nucleotides to Networks, Ghent, Belgium
4Data Mining and Modelling for Biomedicine group, VIB Inflammation Research Center, Ghent, Belgium
5Department of Respiratory Medicine, Ghent University, Ghent, Belgium
6Department of Uro-Gynaecology, Ghent University Hospital, Ghent, Belgium
Katleen De Preter, email: [email protected]
Keywords: neuroblastoma; ALK; ALK inhibition; ALK signaling; dynamic
Received: July 28, 2017 Accepted: October 17, 2017 Published: November 06, 2017
Background: Neuroblastoma is an aggressive childhood malignancy of the sympathetic nervous system. Despite multi-modal therapy, survival of high-risk patients remains disappointingly low, underscoring the need for novel treatment strategies. The discovery of ALK activating mutations opened the way to precision treatment in a subset of these patients. Previously, we investigated the transcriptional effects of pharmacological ALK inhibition on neuroblastoma cell lines, six hours after TAE684 administration, resulting in the 77-gene ALK signature, which was shown to gradually decrease from 120 minutes after TAE684 treatment, to gain deeper insight into the molecular effects of oncogenic ALK signaling.
Aim: Here, we further dissected the transcriptional dynamic profiles of neuroblastoma cells upon TAE684 treatment in a detailed timeframe of ten minutes up to six hours after inhibition, in order to identify additional early targets for combination treatment.
Results: We observed an unexpected initial upregulation of positively regulated MYCN target genes following subsequent downregulation of overall MYCN activity. In addition, we identified adrenomedullin (ADM), previously shown to be implicated in sunitinib resistance, as the earliest response gene upon ALK inhibition.
Conclusions: We describe the early and late effects of ALK inhibitor TAE684 treatment on the neuroblastoma transcriptome. The observed unexpected upregulation of ADM warrants further investigation in relation to putative ALK resistance in neuroblastoma patients currently undergoing ALK inhibitor treatment.
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