48 Trabectedin and lurbinectedin are effective against leukemic cells derived from patients affected by chronic and juvenile myelomonocytic leukemia

RNA Pol II in global NER (XPC) deficient cells, but failed to do it in TC NER (CSB, XPD and XPG) deficient cells. Importantly, these effects were confirmed to be specific for the Rpb1 subunit of RNA Pol II, since other subunits were not affected (Rpb2 and Rpb4) as well as other factors of the transcriptional machinery, such as TBP (TFIID), p62 (TFIIH), XPD or the RPA194 subunit of the RNA Pol I. Finally, it was also demonstrated that, contrary to what occurs after DNA damage with UV light, the transcription of p53 target genes important for DNA repair, including p21 or mdm2, was irreversibly inhibited after PM01183 treatment. Together, these results show the mechanism by which PM01183 inhibits trans-activated transcription process on tumor cells.