In Vivo Expansion of Cancer Stemness Affords Novel Cancer Stem Cell Targets: Malignant Rhabdoid Tumor as an Example

Publication date: Available online 16 August 2018Source: Stem Cell ReportsAuthor(s): Hana Golan, Rachel Shukrun, Revital Caspi, Einav Vax, Naomi Pode-Shakked, Sanja Goldberg, Oren Pleniceanu, Dekel D. Bar-Lev, Michal Mark-Danieli, Sara Pri-Chen, Jasmine Jacob-Hirsch, Itamar Kanter, Ariel Trink, Ginette Schiby, Ron Bilik, Tomer Kalisky, Orit Harari-Steinberg, Amos Toren, Benjamin DekelSummaryCancer stem cell (CSC) identification relies on transplantation assays of cell subpopulations sorted from fresh tumor samples. Here, we attempt to bypass limitations of abundant tumor source and predetermined immune selection by in vivo propagating patient-derived xenografts (PDX) from human malignant rhabdoid tumor (MRT), a rare and lethal pediatric neoplasm, to an advanced state in which most cells behave as CSCs. Stemness is then probed by comparative transcriptomics of serial PDXs generating a gene signature of epithelial to mesenchymal transition, invasion/motility, metastasis, and self-renewal, pinpointing putative MRT CSC markers. The relevance of these putative CSC molecules is analyzed by sorting tumorigenic fractions from early-passaged PDX according to one such molecule, deciphering expression in archived primary tumors, and testing the effects of CSC molecule inhibition on MRT growth. Using this platform, we identify ALDH1 and lysyl oxidase (LOX) as relevant targets and provide a larger framework for target and drug discovery in rare pediatric cancers.Graphical Abstract
Source: Stem Cell Reports - Category: Stem Cells Source Type: research