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Evaluation of the Temporal Window for Drug Delivery Following Ultrasound-mediated Membrane Permeability Enhancement

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Publisher Springer
Date 2010 Jun 4
PMID 20521134
Citations 26
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Abstract

Purpose: Ultrasound-induced cavitation facilitates cellular uptake of drugs via increased membrane permeability. Here, the purpose was to evaluate the duration of enhanced membrane permeability following ultrasound treatment in cell culture.

Procedures: Optical chromophores with fluorescence intensity increasing 100-1,000-fold upon intercalation with nucleic acids served as smart agents for reporting cellular uptake. Opticell chambers with a monolayer of C6 cells were subjected to ultrasound in the presence of microbubbles followed by varying delays between 0 and 24 h before addition of Sytox Green optical contrast agent. Micro- and macroscopic fluorescence were used for qualitative and quantitative analysis.

Results: Up to 25% of viable cells showed uptake of contrast agent with a half time of 8 h, with cellular uptake persisting even at 24 h. Only cells exposed to ultrasound showed the effect.

Conclusion: The temporal window of increased membrane permeability is much longer in these studies than previously suggested. This may have important repercussions for in vivo studies in which membrane permeability may be temporally separated from drug delivery.

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