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Proceedings Paper

Plasmonic eradication of malignant cells in a three dimensional culture (Conference Presentation)
Author(s): Limor Minai; Dvir Yelin

Paper Abstract

The interaction between gold nanoparticles and femtosecond laser irradiation has been shown to be effective in damaging malignant cells in two-dimensional cell cultures. Further studies with rodent models have also shown promising results; however, rodent physiology and genetics are known to differ substantially from that of humans, often failing to successfully predict the human response to treatment. For bridging the gap between two-dimensional cell cultures and animal models for plasmonic phototherapy, we use a natural hydrogel extracted from mouse sarcoma as a three dimensional scaffold for growing breast cancer epithelial cells in co-culture with healthy fibroblast cells. The malignant cells were specifically targeted using anti-EGFR-coated gold nanospheres, followed by washout of unbound particles and irradiation by amplified femtosecond pulses at off-resonance wavelength of 800 nm. Irradiated cell colonies seized to develop and grow; after approximately three days, time-lapse imaging revealed widespread death of both normal fibroblasts and malignant epithelial cells, leading to disintegration of all cell colonies. Pulse broadening experiments demonstrated similar cell death for pulses between 45 fs and 400 fs of equal energy, while pulses longer than 500 fs had no visible effect on the cells. The results suggest that cell damage is primarily photothermal, and that cells in three-dimensional cultures are more resistant to the effect of the laser pulses, requiring several irradiation sequences and exhibiting slow colony disintegration.

Paper Details

Date Published: 14 March 2018
Proc. SPIE 10522, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII, 1052209 (14 March 2018);
Show Author Affiliations
Limor Minai, Technion-Israel Institute of Technology (Israel)
Dvir Yelin, Technion-Israel Institute of Technology (Israel)

Published in SPIE Proceedings Vol. 10522:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII
Peter R. Herman; Michel Meunier; Roberto Osellame, Editor(s)

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