Purpose: The aim of this study was to identify the optimal ultrasound (US) parameters for gene
and drug delivery.
Methods: In order to target SkBr3, which is a breast cancer cell overexpressing the Her2 receptor,
trastuzumab (Herceptin) was used. Micobubble-nanoliposome complex (MLC) was mixed with
trastuzumab and stored overnight. Finally, MLC was combined with Her2Ab. A US device equipped
with a 1-MHz probe was used for delivery to the cell. Several parameters, including intensity (w/
cm2
), time (minutes), and duty cycle (%), were varied within a range from 1 w/cm2
, 1 minute, and
20% to 2 w/cm2
, 2 minutes, and 60%, respectively. A confocal laser scanning microscope (CLSM)
was used to confirm the delivery of MLC to the cells after US treatment.
Results: MLC with fluorescent dyes and trastuzumab was synthesized successfully. By delivering
MLC with Her2Ab to cells, the targeting effect of trastuzumab with MLC was confirmed by CLSM.
The cell membranes showed green (fluorescein isothiocyanate) and red (Texas red) fluorescence
but treatments with MLC without Her2Ab did not show any fluorescence. Optimal conditions for
US-mediated delivery were 1 or 2 w/cm2
, 2 minutes, and 60% (uptake ratio, 95.9% for 1 w/cm2
and 95.7% for 2 w/cm2
) for hydrophobic materials and 2 w/cm2
, 2 minutes, and 60% (uptake
ratio, 95.0%) for hydrophilic materials.
Conclusion: The greater the strength, duty cycle, and period of US application within the tested
range, the more efficiently the fluorescent contents were conveyed.
Purpose: The aim of this study was to identify the optimal ultrasound (US) parameters for geneand drug delivery.Methods: In order to target SkBr3, which is a breast cancer cell overexpressing the Her2 receptor,trastuzumab (Herceptin) was used. Micobubble-nanoliposome complex (MLC) was mixed withtrastuzumab and stored overnight. Finally, MLC was combined with Her2Ab. A US device equippedwith a 1-MHz probe was used for delivery to the cell. Several parameters, including intensity (w/cm2), time (minutes), and duty cycle (%), were varied within a range from 1 w/cm2, 1 minute, and20% to 2 w/cm2, 2 minutes, and 60%, respectively. A confocal laser scanning microscope (CLSM)was used to confirm the delivery of MLC to the cells after US treatment.Results: MLC with fluorescent dyes and trastuzumab was synthesized successfully. By deliveringMLC with Her2Ab to cells, the targeting effect of trastuzumab with MLC was confirmed by CLSM.The cell membranes showed green (fluorescein isothiocyanate) and red (Texas red) fluorescencebut treatments with MLC without Her2Ab did not show any fluorescence. Optimal conditions forUS-mediated delivery were 1 or 2 w/cm2, 2 minutes, and 60% (uptake ratio, 95.9% for 1 w/cm2and 95.7% for 2 w/cm2) for hydrophobic materials and 2 w/cm2, 2 minutes, and 60% (uptakeratio, 95.0%) for hydrophilic materials.Conclusion: The greater the strength, duty cycle, and period of US application within the testedrange, the more efficiently the fluorescent contents were conveyed.
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