Lurbinectedin Specifically Triggers the Degradation of Phosphorylated RNA Polymerase II and the Formation of DNA Breaks in Cancer Cells

Molecular Cancer Therapeutics - Tập 15 Số 10 - Trang 2399-2412 - 2016
Gema Santamaría Núñez1, Carlos Mario Genes Robles2, Christophe Giraudon2, Juan Fernando Martínez-Leal1, Emmanuel Compe2, Frédéric Coin2, Pablo Avilés1, Carlos M. Galmarini1, Jean‐Marc Egly2
11Cell Biology and Pharmacogenomics Department, Pharmamar SA, Colmenar Viejo, Madrid, Spain.
22Department of Functional Genomics and Cancer, IGBMC, CNRS/INSERM/University of Strasbourg, C. U. Strasbourg, France.

Tóm tắt

Abstract We have defined the mechanism of action of lurbinectedin, a marine-derived drug exhibiting a potent antitumor activity across several cancer cell lines and tumor xenografts. This drug, currently undergoing clinical evaluation in ovarian, breast, and small cell lung cancer patients, inhibits the transcription process through (i) its binding to CG-rich sequences, mainly located around promoters of protein-coding genes; (ii) the irreversible stalling of elongating RNA polymerase II (Pol II) on the DNA template and its specific degradation by the ubiquitin/proteasome machinery; and (iii) the generation of DNA breaks and subsequent apoptosis. The finding that inhibition of Pol II phosphorylation prevents its degradation and the formation of DNA breaks after drug treatment underscores the connection between transcription elongation and DNA repair. Our results not only help to better understand the high specificity of this drug in cancer therapy but also improve our understanding of an important transcription regulation mechanism. Mol Cancer Ther; 15(10); 2399–412. ©2016 AACR.

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