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• W2591485024 abstract "Characterization of therapeutic response in primary and metastatic tumors is limited by endpoint studies and tissue collection. We have successfully developed a unique double-transgenic mouse model, which combines the polyoma virus middle T oncogene (PyVT), a model of human breast cancer, with a nuclear factor-kappaB (NF-kB) reporter model (NGL). PyVT mice spontaneously form primary mammary fat pad tumors, with 80% of mice developing metastatic lesions in the lungs. The reporter is luciferase, driven by NF-kB activation, to provide quantitative bioluminescent measurements of spatially-specific NF-kB activity. The resulting double transgenic (PyNGL) mice were monitored using in vivo imaging systems (IVIS) multiple times, before and after treatment, to quantitatively and spatially characterize NF-kB therapeutic response, both locally and systemically. High intensity focused ultrasound (HIFU) was guided by magnetic resonance (MR) thermometry for tumor-localized hyperthermia which was dosage-controlled by the thermal feedback MR guided HIFU (MRgHIFU) system. A single primary mammary tumor in each PyNGL was treated with sub-ablative hyperthermia of 42⁰ for up to 25 minutes. Pre-treatment IVIS measurements were collected to determine baseline NF-kB activity within each mouse, followed by IVIS imaging every twelve hours after treatment until tissue collection. Treated tumor, contralateral (untreated) tumors, and spleens were collected for immunophenotyping and cytokine analysis using flow cytometry. PyNGL mice exhibited decreased NF-kB activity, spatially correlated with HIFU treatment, as early as 12 hours. In contrast, NF-kB increased in contralateral tumors as early as 24 hours following treatment. Immunophenotyping reveals changes in tumor infiltrating leukocyte populations in HIFU-treated and contralateral tumors, including quantity and phenotype of T cells. The unique murine model developed allowed quantitative, temporal characterization of local and distant tumor response to MFgHIFU. The spontaneous, metastatic nature of PyVT tumor formation in concert with the non-destructive, spatiotemporal imaging capabilities of the NF-kB reporter transgene make the PyNGL model an unparalleled tool for research in metastatic disease. Citation Format: Mary Dockery, Megan Poorman, Stephanie Dudzinski, Whitney Barham, Vandiver Chaplin, Ryan Spears, Jiro Kusunose, Fiona Yull, Charles Caskey, William Grissom, Todd Giorgio. Novel NF-kB reporter murine model of spontaneous, metastatic breast cancer for spatiotemporal monitoring of local and systemic therapeutic response. [abstract]. In: Proceedings of the AACR Special Conference on Tumor Metastasis; 2015 Nov 30-Dec 3; Austin, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(7 Suppl):Abstract nr A06." @default.
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• W2591485024 date "2016-04-01" @default.
• W2591485024 modified "2023-09-26" @default.
• W2591485024 title "Abstract A06: Novel NF-kB reporter murine model of spontaneous, metastatic breast cancer for spatiotemporal monitoring of local and systemic therapeutic response" @default.
• W2591485024 doi "https://doi.org/10.1158/1538-7445.tummet15-a06" @default.
• W2591485024 hasPublicationYear "2016" @default.
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