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TitleThe uptake, retention and clearance of drug-loaded dendrimer nanoparticles in astrocytes - electrophysiological quantification
Author(s)Chowdury, Helena H.
Cerqueira, Susana Isabel Ribeiro
Sousa, Nuno
Oliveira, J. M.
Reis, R. L.
Zorec, Robert
KeywordsDendrimer nanoparticles
High-resolution membrane capacitance
Live confocal imaging
Issue dateJan-2018
PublisherRoyal Society of Chemistry
JournalBiomaterials Science
CitationChowdury H. H., Cerqueira S. R., Sousa N., Oliveira J. M., Reis R. L., Zorec R. The Uptake, Retention and Clearance of Drug-Loaded Dendrimer Nanoparticles in Astrocytes - Electrophysiological Quantification, Biomaterials Science, Vol. 6, Issue 2, pp. 388-397, doi:10.1039/C7BM00886D, 2018
Abstract(s)Nanoparticle-based drug delivery systems may impose risks to patients due to potential toxicity associated with lack of clearance from cells or prolonged carrier-cell retention. This work evaluates vesicular cell uptake, retention and the possible transfer of endocytosed methylprednisolone-loaded carboxymethylchitosan/poly(amidoamine) dendrimer nanoparticles (NPs) into secretory vesicles of rat cultured astrocytes. Cells were incubated with NPs and unitary vesicle fusions/fissions with the plasma membrane were monitored employing high resolution membrane capacitance measurements. In NPs-treated cells the frequency of unitary exocytotic events was significantly increased. The presence of NPs also induce an increase in the size of exocytotic vesicles interacting with the plasma membrane, which exhibit transient fusion with prolonged fusion pore dwell-time. Live-cell confocal imaging revealed that once NPs internalize into endocytotic compartments they remain in the cell for 7 days, although a significant proportion of these merge with secretory vesicles destined for exocytosis. Co-localization studies show the route of clearance of NPs from cells via the exocytotic pathway. These findings bring new insight into the understanding of the intracellular trafficking and biological interactions of drug-loaded dendrimer NPs targeting astrocytes.
Publisher version
AccessOpen access
Appears in Collections:3B’s - Artigos em revistas/Papers in scientific journals
ICVS - Artigos em revistas internacionais / Papers in international journals

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