Targeted Gold Nanoparticles as Vascular Disrupting Agents during Radiation Therapy RI Berbeco 1, H Korideck 1, S Kunjachan 1, R Kumar 2, S Sridhar 2, A.

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Presentation transcript:

Targeted Gold Nanoparticles as Vascular Disrupting Agents during Radiation Therapy RI Berbeco 1, H Korideck 1, S Kunjachan 1, R Kumar 2, S Sridhar 2, A Detappe 1, W Ngwa 1 and M Makrigiorgos 1 ( 1) Department of Radiation Oncology, Brigham and Women’s Hospital, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA (2) Nanomedicine Science and Technology Center, Northeastern University, Boston, MA

Sept. 16, 2014, S-2 Gold nanoparticles as Vascular Disrupting Agents – Ross Berbeco, PhD Results: In Vitro Damage enhancement for conventional and FFF 6 MV beams Performed in a clinical 6 MV photon beam with HeLa cells  H2Ax to assess DNA damage Measured effect of field size, depth, FFF Key results: GNP enhancement increases with field size, depth, FFF

Sept. 16, 2014, S-3 Gold nanoparticles as Vascular Disrupting Agents – Ross Berbeco, PhD Results: In Vivo Fluorescence imaging of a PANC1 tumored mouse Key results: 1) Preferential tumor uptake 2) Renal clearance (a) at three time points after IV GNP injection (b) ex vivo imaging of the tumor (t), pancreas (p), and spleen (s) (c) ex vivo imaging of the liver (l) and kidneys (k) demonstrate the preference for renal clearance

Sept. 16, 2014, S-4 Gold nanoparticles as Vascular Disrupting Agents – Ross Berbeco, PhD Results: In Vivo TEM imaging of tumor tissue Key results: Tumor endothelial cell uptake Orthotopic PANC-1 tumor endothelial cell 24 hrs after IV injection with GNP. Black arrows point to GNP

Sept. 16, 2014, S-5 Gold nanoparticles as Vascular Disrupting Agents – Ross Berbeco, PhD Results: In Vivo Confocal imaging of tumor tissue Key results: Vascular disruption near GNP clusters visualized A. Vascular disruption (solid white arrows) in the presence of GNP clusters. B. localized diffusion at spots near the microvasculature (solid white arrow) C. Both ‘fragmented’ and ‘diffused’ tumor vessels were observed.

Sept. 16, 2014, S-6 Gold nanoparticles as Vascular Disrupting Agents – Ross Berbeco, PhD Summary/conclusions Preliminary results demonstrate that tumor vascular disruption is expected when targeted GNP are combined with radiation Justify further in vivo investigation Engineering GNP for more efficient targeting, imaging, and therapy References: Berbeco, R. I., et al. (2011). "Localized dose enhancement to tumor blood vessel endothelial cells via megavoltage x-rays and targeted gold nanoparticles: new potential for external beam radiotherapy." International Journal of Radiation Oncology Biology Physics 81(1): Berbeco, R. I., et al. (2012). "DNA damage enhancement from gold nanoparticles for clinical MV photon beams." Radiation Research 178(6): Detappe, A., et al. (2013). "The effect of flattening filter free delivery on endothelial dose enhancement with gold nanoparticles." Medical Physics 40(3): Kumar, R., et al. (2013). "Third generation gold nanoparticle platform optimized for radiation therapy." Translational Cancer Research 2(4):