biostudies-literatureUnknownMichael CNCI NIH HHSNIGMS NIH HHSAnaplastic thyroid cancer (ATC) is a rare malignant subtype of thyroid cancer. While ATC is rare it accounts for a disproportionately high number of thyroid cancer-related deaths. Here we developed an ATC xenotransplant model in zebrafish larvae, where we can study tumorigenesis and therapeutic response in vivo. Using both mouse (T4888M) and human (C643) derived fluorescently labeled ATC cell lines we show these cell lines display different engraftment rates, mass volume, proliferation, and angiogenic potential. Next, using a PIP-FUCCI reporter to track proliferation <i>in-vivo</i> we observed cells in each phase of the cell cycle. Additionally, we performed long-term non-invasive intravital microscopy over 48 hours to understand cellular dynamics in the tumor microenvironment at the singlbioRxiv : the preprint server for biology2023.05.29.541816https://www.ebi.ac.uk/biostudies/studies/S-EPMC10312444biostudies-literatureA zebrafish xenotransplant model of anaplastic thyroid cancer to study the tumor microenvironment and innate immune cell interactions <i>in vivo</i>.PMC10312444P30 CA013330R35 GM118027T32 GM145438R01 CA128943Michael CDi Cristofano Ade Oliveira SfalseA zebrafish xenotransplant model of anaplastic thyroid cancer to study the tumor microenvironment and innate immune cell interactions <i>in vivo</i>.Anaplastic thyroid cancer (ATC) is a rare malignant subtype of thyroid cancer. While ATC is rare it accounts for a disproportionately high number of thyroid cancer-related deaths. Here we developed an ATC xenotransplant model in zebrafish larvae, where we can study tumorigenesis and therapeutic response in vivo. Using both mouse (T4888M) and human (C643) derived fluorescently labeled ATC cell lines we show these cell lines display different engraftment rates, mass volume, proliferation, and angiogenic potential. Next, using a PIP-FUCCI reporter to track proliferation <i>in-vivo</i> we observed cells in each phase of the cell cycle. Additionally, we performed long-term non-invasive intravital microscopy over 48 hours to understand cellular dynamics in the tumor microenvironment at the singl2023-01-01T00:00:00Z2023 Jun2025-04-04T09:42:23.557Z2025-04-04T09:42:23.557ZS-EPMC103124443739826610.1101/2023.05.29.541816