Gli1/DNA interaction is a druggable target for Hedgehog-dependent tumors

Paola Infante, Mattia Mori, Romina Alfonsi, Francesca Ghirga, Federica Aiello, Sara Toscano, Cinzia Ingallina, Mariangela Siler, Danilo Cucchi, Agnese Po, Evelina Miele, Davide D'Amico, Gianluca Canettieri, Enrico De Smaele, Elisabetta Ferretti, Isabella Screpanti, Gloria Uccello Barretta, Maurizio Botta, Bruno Botta, Alberto GulinoLucia Di Marcotullio

Research output: Contribution to journalArticlepeer-review

Abstract

Hedgehog signaling is essential for tissue development and stemness, and its deregulation has been observed in many tumors. Aberrant activation of Hedgehog signaling is the result of genetic mutations of pathway components or other Smo-dependent or independent mechanisms, all triggering the downstream effector Gli1. For this reason, understanding the poorly elucidated mechanism of Gli1-mediated transcription allows to identify novel molecules blocking the pathway at a downstream level, representing a critical goal in tumor biology. Here, we clarify the structural requirements of the pathway effector Gli1 for binding to DNA and identify Glabrescione B as the first small molecule binding to Gli1 zinc finger and impairing Gli1 activity by interfering with its interaction with DNA. Remarkably, as a consequence of its robust inhibitory effect on Gli1 activity, Glabrescione B inhibited the growth of Hedgehog-dependent tumor cells in vitro and in vivo as well as the self-renewal ability and clonogenicity of tumor-derived stem cells. The identification of the structural requirements of Gli1/DNA interaction highlights their relevance for pharmacologic interference of Gli signaling.

Original languageEnglish
Pages (from-to)200-217
Number of pages18
JournalEMBO Journal
Volume34
Issue number2
DOIs
Publication statusPublished - Jan 14 2015

Keywords

  • Cancer
  • Gli inhibitors
  • Gli1-DNA interaction
  • Hedgehog

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Neuroscience(all)

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