Summary
We have previously identified receptor tyrosine kinase-like orphan receptor 1 (ROR1) as a direct transcriptional target of TTF-1/NKX2-1, a lineage-survival oncogene in lung adenocarcinoma. ROR1 sustains prosurvival signaling from multiple receptor tyrosine kinases including epidermal growth factor receptor, MET, and insulin-like growth factor 1 receptor in part by maintaining the caveolae structure as a scaffold protein of cavin-1 and caveolin-1. In this study, a high throughput screening of the natural product library containing 2560 compounds was undertaken using a cell-based FluoPPI assay detecting ROR1-cavin-1 interaction. As a result, geldanamycin (GA), a known inhibitor of heat shock protein 90 (HSP90), was identified as a potential inhibitor of ROR1. Geldanamycin, as well as two GA
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