Gallic Acid: A Natural Phenolic Compound Exerting Antitumoral Activities in Colorectal Cancer via Interaction with G-Quadruplexes Sánchez Martín, Victoria Plaza Calonge, María del Carmen Soriano Lerma, Ana del Carmen Ortiz González, Matilde Linde Rodríguez, Ángel Pérez Carrasco, Virginia Ramírez Macías, Inmaculada Cuadros Celorrio, Marta Eugenia Gutiérrez Fernández, José Murciano Calles, Javier Rodríguez Manzaneque, Juan Carlos Soriano, Miguel García Salcedo, José Antonio G-quadruplex Phenol Gallic acid Cancer Colorectal cancer Natural phenolic compounds have gained momentum for the prevention and treatment of cancer, but their antitumoral mechanism of action is not yet well understood. In the present study, we screened the antitumoral potential of several phenolic compounds in a cellular model of colorectal cancer (CRC).We selected gallic acid (GA) as a candidate in terms of potency and selectivity and extensively evaluated its biological activity. We report on the role of GA as a ligand of DNA G-quadruplexes (G4s), explaining several of its antitumoral effects, including the transcriptional inhibition of ribosomal and CMYC genes. In addition, GA shared with other established G4 ligands some effects such as cell cycle arrest, nucleolar stress, and induction of DNA damage. We further confirmed the antitumoral and G4-stabilizing properties of GA using a xenograft model of CRC. Finally, we succinctly demonstrate that GA could be explored as a therapeutic agent in a patient cohort with CRC. Our work reveals that GA, a natural bioactive compound present in the diet, affects gene expression by interaction with G4s both in vitro and in vivo and paves the way towards G4s targeting with phenolic compounds. 2022-06-29T10:27:17Z 2022-06-29T10:27:17Z 2022-05-26 info:eu-repo/semantics/article Sanchez-Martin, V... [et al.]. Gallic Acid: A Natural Phenolic Compound Exerting Antitumoral Activities in Colorectal Cancer via Interaction with G-Quadruplexes. Cancers 2022, 14, 2648. [https://doi.org/10.3390/cancers14112648] http://hdl.handle.net/10481/75715 10.3390/cancers14112648 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España MDPI