期刊
JOURNAL OF CONTROLLED RELEASE
卷 138, 期 1, 页码 78-85出版社
ELSEVIER
DOI: 10.1016/j.jconrel.2009.04.022
关键词
Poly(amidoamine) dendrimers; Polyethylene glycol; Caco-2 cells; Transport; Oral delivery
资金
- NSF
- Department of Defense Multidisciplinary Postdoctoral Fellowship [W81XWH-06-1-0698]
- Maryland Department of Business and Economic Development
- NIH [R01 EB07470, DE19050]
The purpose of this work was to assess the impact of PEGylation on transepithelial transport of anionic poly (amidoamine) dendrimers. Cytotoxicity, uptake and transport across Caco-2 cells of PEGylated G3.5 and G4.5 PAMAM dendrimers were studied. Methoxy polyethylene glycol (750 Da) was conjugated to carboxylic acid-terminated PAMAM dendrimers at feed ratios of 1, 2 and 4 PEG per dendrimer. Compared to the control, PEGylation of anionic dendrimers did not significantly alter cytotoxicity up to a concentration of 0.1 mM. PEGylation of G3.5 dendrimers significantly decreased cellular uptake and transepithelial transport while PEGylation of G4.5 dendrimers led to a significant increase in uptake, but also a significant decrease in transport Dendrimer PEGylation reduced the opening of tight junctions as evidenced by confocal microscopy techniques. Modulation of the tight junctional complex correlated well with changes in PEGylated dendrimer transport and suggests that anionic dendrimers are transported primarily through the paracellular route. PEGylated dendrimers show promise in oral delivery applications where increased functionality for drug conjugation and release is desired. (C) 2009 Elsevier B.V. All rights reserved.
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