title: 3D imaging of the response to CDC25 inhibition in multicellular spheroids.
abstract: Multicellular tumor spheroids closely mimic the 3D organization of avascular microregions within tumors and thereby represent a valuable model for the evaluation of anticancer drugs. In this study, we performed a 3D analysis of the response to the CDC25 phosphatase inhibitor IRC-083864 in HCT116 spheroids. Continuous exposure to IRC-083864 strongly inhibits the growth of spheroids and is shown to correlate with a decrease in Ki-67 positive cells. The cytotoxicity induced by IRC-083864 was examined by two-photon laser microscopy imaging and 3D reconstruction. Visualization in 3D allowed us to demonstrate that IRC-083864 treatment results in the inhibition of mitosis and induces cell death specifically localized in the outer proliferative cell layers of the spheroid structure. These results emphasize the importance of 3D models and of in toto analysis for the evaluation of anticancer drugs cytotoxicity.
authors.affiliation: Centre National de la Recherche Scientifique, LBCMCP UMR5088, Toulouse, France.
authors.forename: Céline
authors.initials: C
authors.lastname: Frongia
authors.forename: Corinne
authors.initials: C
authors.lastname: Lorenzo
authors.forename: Fréderic
authors.initials: F
authors.lastname: Gianni
authors.forename: Grégoire Pierre
authors.initials: GP
authors.lastname: Prevost
authors.forename: Bernard
authors.initials: B
authors.lastname: Ducommun
authors.forename: Valérie
authors.initials: V
authors.lastname: Lobjois
mesh_terms: D052160:Benzothiazoles / Q000494:pharmacology*; D001583:Benzoxazoles / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects*; D002470:Cell Survival / Q000187:drug effects; D045325:HCT116 Cells; D006801:Humans; D021621:Imaging, Three-Dimensional; D019394:Ki-67 Antigen / Q000378:metabolism; D008938:Mitosis / Q000187:drug effects; D017785:Photons; D018874:Spheroids, Cellular / Q000187:drug effects* / Q000473:pathology; D020687:cdc25 Phosphatases / Q000037:antagonists & inhibitors* / Q000378:metabolism
chemical_list: C535248:2-(2,5-difluorophenyl)-6-((3-(methyl(3-((2-methyl-4,7-dioxo-4,7-dihydro-1,3-benzothiazol-5-yl)amino)propyl)amino)propyl)amino)-1,3-benzoxazole-4,7-dione; D052160:Benzothiazoles; D001583:Benzoxazoles; D019394:Ki-67 Antigen; D020687:cdc25 Phosphatases