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bioRxiv · 10.1101/2024.07.15.603565

YAP1 is a key regulator of EWS::FLI1-dependent malignant transformation upon IGF-1 mediated reprogramming of bone mesenchymal stem cells

Kovar, H.·Noorizadeh, R.·Sax, B.·Javaheri, T.·Radic Sarikas, B.·Fock, V.·Kauer, M.·Bykov, A.·Suresh, V.·Schlederer, M.·Kenner, L.·Weber, G.·Mikulits, W.·Halbritter, F.·Moriggl, R.
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Abstract

AbstractEwing sarcoma (EwS) is an aggressive cancer of adolescents in need of effective treatments. Insulin like growth factor (IGF) 1 was previously reported an autocrine growth factor for EwS, but only 10% of patients responded to IGF-1 receptor blockade. Although presumed to originate from mesenchymal progenitors during bone development, targeting of the EwS driver oncogene EWS::FLI1 to the mesenchymal lineage in a conditional mouse model did not result in tumor formation but led to skeletal malformations and perinatal death. We report that transient exposure to IGF-1 concentrations mimicking serum levels during puberty reprogrammed limb-derived mesenchymal cells of EWS::FLI1-mutant mice to stable transformation and tumorigenicity. We identified a modular mechanism of IGF-1-driven tumor promotion in the early steps of EwS pathogenesis, in which Yap1 plays a central role. Pharmacologic Yap1/Tead inhibition reversed the transformed phenotype of EWS::FLI1 expressing cells. Our data provide a rationale for combined IGF-1R and YAP/TEAD inhibition in the treatment of EwS patients. Graphical Abstract O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=185 SRC="FIGDIR/small/603565v1_ufig1.gif" ALT="Figure 1"> View larger version (87K): org.highwire.dtl.DTLVardef@a6a298org.highwire.dtl.DTLVardef@1fcab8aorg.highwire.dtl.DTLVardef@1621e27org.highwire.dtl.DTLVardef@a9994e_HPS_FORMAT_FIGEXP M_FIG C_FIG

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Kovar, H., Noorizadeh, R., Sax, B., Javaheri, T., Radic Sarikas, B., Fock, V., Kauer, M., Bykov, A., Suresh, V., Schlederer, M., Kenner, L., Weber, G., Mikulits, W., Halbritter, F., Moriggl, R.. 2024-07-18. YAP1 is a key regulator of EWS::FLI1-dependent malignant transformation upon IGF-1 mediated reprogramming of bone mesenchymal stem cells. https://doi.org/10.1101/2024.07.15.603565

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