Promoters of ASCL1- and NEUROD1-dependent genes are specific targets of lurbinectedin in SCLC cells.
Fiche publication
Date publication
mars 2022
Journal
EMBO molecular medicine
Auteurs
Membres identifiés du Cancéropôle Est :
Dr COIN Frédéric, Dr EGLY Jean-Marc, Pr RICCI Roméo, Dr COMPE Emmanuel
Tous les auteurs :
Costanzo F, Martínez Diez M, Santamaría Nuñez G, Díaz-Hernandéz JI, Genes Robles CM, Díez Pérez J, Compe E, Ricci R, Li TK, Coin F, Martínez Leal JF, Garrido-Martin EM, Egly JM
Lien Pubmed
Résumé
Small-Cell Lung Cancer (SCLC) is an aggressive neuroendocrine malignancy with a poor prognosis. Here, we focus on the neuroendocrine SCLC subtypes, SCLC-A and SCLC-N, whose transcription addiction was driven by ASCL1 and NEUROD1 transcription factors which target E-box motifs to activate up to 40% of total genes, the promoters of which are maintained in a steadily open chromatin environment according to ATAC and H3K27Ac signatures. This leverage is used by the marine agent lurbinectedin, which preferentially targets the CpG islands located downstream of the transcription start site, thus arresting elongating RNAPII and promoting its degradation. This abrogates the expression of ASCL1 and NEUROD1 and of their dependent genes, such as BCL2, INSM1, MYC, and AURKA, which are responsible for relevant SCLC tumorigenic properties such as inhibition of apoptosis and cell survival, as well as for a part of its neuroendocrine features. In summary, we show how the transcription addiction of these cells becomes their Achilles's heel, and how this is effectively exploited by lurbinectedin as a novel SCLC therapeutic endeavor.
Mots clés
ASCL1/NEUROD1, E-boxes/CpG islands, lurbinectedin, transcription addiction
Référence
EMBO Mol Med. 2022 Mar 9;:e14841