A new research paper was published in Oncotarget's Volume 14 on June 21, 2023, entitled, “Diphenyl ditelluride anticancer activity and DNA topoisomerase I poisoning in human colon cancer HCT116 cells.” Diphenyl ditelluride (DPDT) is an organotellurium (OT) compound with pharmacological properties, including antioxidant, antigenotoxic and antimutagenic activities when applied at low concentrations. However, DPDT as well as other OT compounds also show cytotoxicity against mammalian cells when treatments occur at higher drug concentrations. The underlying mechanisms of toxicity of DPDT against tumor cells have previously been poorly explored. In this new study, researchers André Luiz Mendes Juchem, Cristiano Trindade, Juliana Bondan da Silva, Miriana da Silva Machado, Temenouga Nikolova Guecheva, Jaqueline Cesar Rocha, Jenifer Saffi, Iuri Marques de Oliveira, João Antonio Pêgas Henriques, and Alexandre Escargueil from the Federal University of Rio Grande do Sul, Sorbonne Université, Federal University of Health Sciences of Porto Alegre, Lutheran University of Brazil, Bulgarian Academy of Sciences, and University of Vale do Taquari aimed to investigate the effects of DPDT against both human cancer and non-tumorigenic cells. “Together, our results will help to better define DPDT as a potential drug candidate for treating CRC [colorectal cancer].” The researchers used the colonic HCT116 cancer cells and the MRC5 fibroblasts as models. Their results showed that DPDT preferentially targets HCT116 cancer cells when compared to MRC5 cells with IC50 values of 2.4 and 10.1 μM, respectively. This effect was accompanied by the induction of apoptosis and a pronounced G2/M cell cycle arrest in HCT116 cells. Furthermore, DPDT induces DNA strand breaks at concentrations below 5 μM in HCT116 cells and promotes the occurrence of DNA double strand breaks mostly during S-phase as measured by γ-H2AX/EdU double staining. Finally, DPDT forms covalent complexes with DNA topoisomerase I, as observed by the TARDIS assay, with a more prominent effect observed in HCT116 than in MRC5 cells. Taken together, the results of this study show that DPDT preferentially targets HCT116 colon cancer cells likely through DNA topoisomerase I poisoning. “This makes DPDT an interesting molecule for further development as an anti-proliferative compound in the context of cancer.” Read the full paper: DOI: https://doi.org/10.18632/oncotarget.28465 Correspondence to: João Antonio Pêgas Henriques, Alexandre Escargueil Email: pegas.henriques@ufrgs.br, alexandre.escargueil@gmail.com Sign up for free Altmetric alerts about this article - https://oncotarget.altmetric.com/details/email_updates?id=10.18632%2Foncotarget.28465 Subscribe for free publication alerts from Oncotarget - https://www.oncotarget.com/subscribe/ Keywords - colorectal cancer, HCT116, diphenyl ditelluride, organotellurium, topoisomerase I About Oncotarget Oncotarget is a primarily oncology-focused, peer-reviewed, open access journal. Papers are published continuously within yearly volumes in their final and complete form, and then quickly released to Pubmed. On September 15, 2022, Oncotarget was accepted again for indexing by MEDLINE. Oncotarget is now indexed by Medline/PubMed and PMC/PubMed. To learn more about Oncotarget, please visit https://www.oncotarget.com and connect with us: SoundCloud - https://soundcloud.com/oncotarget Facebook - https://www.facebook.com/Oncotarget/ Twitter - https://twitter.com/oncotarget Instagram - https://www.instagram.com/oncotargetjrnl/ YouTube - https://www.youtube.com/@OncotargetJournal LinkedIn - https://www.linkedin.com/company/oncotarget Pinterest - https://www.pinterest.com/oncotarget/ Reddit - https://www.reddit.com/user/Oncotarget/ Media Contact MEDIA@IMPACTJOURNALS.COM 18009220957