Abstract
Purpose
In this work, we aimed to comprehensively document the expression of Strawberry Notch homolog (SBNO) 1 and 2 in glioblastoma (GBM) tissue and patient-derived GBM stem-like cell (GSC) cultures.
Methods
We investigated SBNO1 and SBNO2 expression at the RNA and protein levels in glioma patient tissue and GSCs, respectively by performing immunostainings and qPCR analyses. We also used publicly-available datasets for assessing SBNO1 and SBNO2 gene expression and related copy number alterations. We used lentiviral transduction of SBNO2 to analyze the effect of its expression in patient-derived GSCs.
Results
We observed that SBNO2 expression is increased in GBM tissue samples compared to non tumoral brain, or lower-grade gliomas, whereas SBNO1 expression remains unchanged. We hypothesized that such SBNO2 high expression might be linked to copy-number alterations at the level of the 19p13 chromosome section. We located SBNO1 and SBNO2 in different subcellular compartments. Finally, we observed that SBNO2 overexpression induces different phenotypes in different patient-derived GSCs.
Conclusion
These results provide the first characterization of SBNO1 and SBNO2 expression in glioma tissue, and indicate SBNO2 as highly expressed in GBM.
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Data Availability
The authors declare that all data supporting the findings of this study are available within the article and its supplementary information files. Other information is available from the corresponding author upon reasonable request.
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Acknowledgements
We thank the Neurosurgery Department and the Biobank from the Liège University Hospital for their support and collaboration. We are thankful to Dr Emmanuel Di Valentin and colleagues the GIGA Viral Vectors platform, for their advice and help in building lentiviral constructions, and we also thank Dr Sandra Ormenese and colleagues from the GIGA Cell Imaging platform.
Funding
We are invaluably grateful for the funding support provided by the the F.R.S.-F.N.R.S., Télévie, the Fondation Hospitalo-Universitaire Léon Frédéricq (Belgium), and the Neurological Foundation (New Zealand). NC is supported by the Neurological Fondation of New Zealand, JS is supported by a Télévie grant, and AL is Post-Doctoral Master Specialist (F.N.R.S.).
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NC, MD, BR and VN contributed to the study conception and design. Material preparation, data collection and analysis were performed by NC, JS, LL and LVS. The first draft of the manuscript was written by VN and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Supplementary Information
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11060_2023_4240_MOESM1_ESM.png
Supplementary file1 (PNG 157 KB)—Figure S1: Expression profiles of SBNO1 and SBNO2 in normal tissues (normalized data from the Human Protein Atlas and GTEx transcriptomics datasets, generated and downloaded from https://www.proteinatlas.org). Results show that SBNO2 is not.
11060_2023_4240_MOESM2_ESM.png
Supplementary file2 (PNG 127 KB)—Figure S2: SBNO2 expression in different cancer tissue samples (from the TCGA database) versus normal matched tissues (from the GTEx database). Generated using the GEPIA online tool (http://gepia.cancer-pku.cn). Results show that SBNO2 is not highly expressed in many of the selected cancer types, only in GBM and pancreatic adenocarcinoma.
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Supplementary file3 (PNG 49 KB)—Figure S3: SBNO2 and SBNO2 expression in GSC spheres vs T018 in adherence. (A) SBNO2 mRNA expression in 5 patient-derived GSC cultures, i.e. T08, T013, T018, T033, T049 + T018 adherence (expressed as fold to GAPDH mRNA, N = 3 independent RNA samples). B) SOX2 mRNA expression in 5 patient-derived GSC cultures, i.e. T08, T013, T018, T033, T049 + T018 adherence (expressed as fold to GAPDH mRNA, N = 3 independent RNA samples).
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Coppieters, N., Scalisi, J., Digregorio, M. et al. Study of Strawberry Notch homolog 1 and 2 expression in human glioblastoma. J Neurooncol 161, 515–523 (2023). https://doi.org/10.1007/s11060-023-04240-7
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DOI: https://doi.org/10.1007/s11060-023-04240-7