Document Detail

Characterization of endocytosis and exocytosis of cationic nanoparticles in airway epithelium cells.
MedLine Citation:
PMID:  20689164     Owner:  NLM     Status:  In-Process    
A major challenge of drug delivery using colloids via the airway is to understand the mechanism implied in their interactions with epithelial cells. The purpose of this work was to characterize the process of endocytosis and exocytosis of cationic nanoparticles (NPs) made of maltodextrin which were developed as a delivery system for antigens in vaccine applications. Confocal microscopy demonstrated that these NP are rapidly endocytosed after as little as 3 min incubation, and that the endocytosis was also faster than NP binding since most of the NPs were found in the middle of the cells around the nuclei. A saturation limit was observed after a 40 min incubation, probably due to an equilibrium becoming established between endocytosis and exocytosis. Endocytosis was dramatically reduced at 4 degrees C compared with 37 degrees C, or by NaN(3) treatment, both results suggesting an energy dependent process. Protamine pretreatment of the cells inhibited NPs uptake and we found that clathrin pathway is implied in their endocytosis. Cholesterol depletion increased NP uptake by 300% and this phenomenon was explained by the fact that cholesterol depletion totally blocked NP exocytosis. These results suggest that these cationic NPs interact with anionic sites, are quickly endocytosed via the clathrin pathway and that their exocytosis is cholesterol dependent, and are similar to those obtained in other studies with viruses such as influenza.
Christophe Youta Dombu; Maya Kroubi; Rima Zibouche; Regis Matran; Didier Betbeder
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-06
Journal Detail:
Title:  Nanotechnology     Volume:  21     ISSN:  1361-6528     ISO Abbreviation:  Nanotechnology     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101241272     Medline TA:  Nanotechnology     Country:  England    
Other Details:
Languages:  eng     Pagination:  355102     Citation Subset:  IM    
EA 4483, IFR 114, Laboratoire de Physiologie, Faculté de Médecine Pôle Recherche, Université de Lille 2, Lille, France.
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