Document Detail

Mechanistic studies of in vitro cytotoxicity of poly(amidoamine) dendrimers in mammalian cells.
MedLine Citation:
PMID:  20736030     Owner:  NLM     Status:  MEDLINE    
Poly(amidoamine) (PAMAM) dendrimer nanoparticles have been demonstrated to elicit a well defined cytotoxicological response from mammalian cell lines, the response increasing systematically with dendrimer generation and number of surface amino groups. In this work, using generation G4, G5, and G6 dendrimers, this systematic response is furthermore demonstrated for the generation of reactive oxygen species, lysosomal activity, and the onset of apoptosis and levels of DNA damage. The results are consistent with a pathway of localisation of PAMAM dendrimers in the mitochondria leading to ROS production causing oxidative stress, apoptosis and DNA damage. ROS production is co-located in the mitochondria, and both generated levels and timescales are systematically generation dependent (G4<G5<G6). Flow cytometry confirms that with increasing dose, the percentage of healthy and early apoptotic cells decreases, whereas the late apoptotic and necrotic cell populations increase. This process is again systematically generation dependent. DNA damage as measured using the TUNEL assay further demonstrates a systematic trend, G4, G5 and G6 showing 4.69%, 25.87% and 89.63% DNA breakage respectively. Increases in lysosomal activity at timescales of ~24h are observed in HaCaT but not SW480 cells upon low concentration PAMAM exposure. Overall, significant differences are observed between the responses of the dermal cell line, HaCaT, and the colon cell line, SW480, and it is suggested that these can be understood in terms of differing intrinsic antioxidant levels.
Sourav Prasanna Mukherjee; Fiona M Lyng; Amaya Garcia; Maria Davoren; Hugh J Byrne
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-22
Journal Detail:
Title:  Toxicology and applied pharmacology     Volume:  248     ISSN:  1096-0333     ISO Abbreviation:  Toxicol. Appl. Pharmacol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-04     Completed Date:  2010-10-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0416575     Medline TA:  Toxicol Appl Pharmacol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  259-68     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Inc. All rights reserved.
Radiation and Environmental Science Centre, Focas Research Institute, Dublin, Institute of Technology, Kevin Street, Dublin 8, Ireland.
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MeSH Terms
Apoptosis / drug effects*,  physiology
Biocompatible Materials / toxicity
Cell Line, Transformed
Cell Line, Tumor
Cytotoxins / toxicity
Dendrimers / toxicity*
Dose-Response Relationship, Drug
Keratinocytes / cytology,  drug effects*,  metabolism
Reactive Oxygen Species / metabolism
Reg. No./Substance:
0/Biocompatible Materials; 0/Cytotoxins; 0/Dendrimers; 0/PAMAM Starburst; 0/Reactive Oxygen Species

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