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Live-cell analysis of cell penetration ability and toxicity of oligo-arginines.

Tünnemann, Gisela and Ter-Avetisyan, Gohar and Martin, Robert M. and Stöckl, Martin and Herrmann, Andreas and Cardoso, M Cristina (2008):
Live-cell analysis of cell penetration ability and toxicity of oligo-arginines.
In: Journal of peptide science : an official publication of the European Peptide Society, pp. 469-76, 14, (4), ISSN 1075-2617,
[Online-Edition: http://www.cardoso-lab.org/publications/Tunnemann%202008.pdf],
[Article]

Abstract

Cell penetrating peptides (CPPs) are useful tools to deliver low-molecular-weight cargoes into cells; however, their mode of uptake is still controversial. The most efficient CPPs belong to the group of arginine-rich peptides, but a systematic assessment of their potential toxicity is lacking. In this study we combined data on the membrane translocation abilities of oligo-arginines in living cells as a function of their chain length, concentration, stability and toxicity. Using confocal microscopy analysis of living cells we evaluated the transduction frequency of the L-isoforms of oligo-arginines and lysines and then monitored their associated toxicity by concomitant addition of propidium iodide. Whereas lysines showed virtually no transduction, the transduction ability of arginines increased with the number of consecutive residues and the peptide concentration, with L-R9 and L-R10 performing overall best. We further compared the L- and D-R9 isomers and found that the D-isoform always showed a higher transduction as compared to the L-counterpart in all cell types. Notably, the transduction difference between D- and L-forms was highly variable between cell types, emphasizing the need for protease-resistant peptides as vectors for drug delivery. Real-time kinetic analysis of the D- and L-isomers applied simultaneously to the cells revealed a much faster transduction for the D-variant. The latter underlies the fact that the isomers do not mix, and penetration of one peptide does not perturb the membrane in a way that gives access to the other peptide. Finally, we performed short- and long-term cell viability and cell cycle progression analyses with the protease-resistant D-R9. Altogether, our results identified concentration windows with low toxicity and high transduction efficiency, resulting in fully bioavailable intracellular peptides.

Item Type: Article
Erschienen: 2008
Creators: Tünnemann, Gisela and Ter-Avetisyan, Gohar and Martin, Robert M. and Stöckl, Martin and Herrmann, Andreas and Cardoso, M Cristina
Title: Live-cell analysis of cell penetration ability and toxicity of oligo-arginines.
Language: English
Abstract:

Cell penetrating peptides (CPPs) are useful tools to deliver low-molecular-weight cargoes into cells; however, their mode of uptake is still controversial. The most efficient CPPs belong to the group of arginine-rich peptides, but a systematic assessment of their potential toxicity is lacking. In this study we combined data on the membrane translocation abilities of oligo-arginines in living cells as a function of their chain length, concentration, stability and toxicity. Using confocal microscopy analysis of living cells we evaluated the transduction frequency of the L-isoforms of oligo-arginines and lysines and then monitored their associated toxicity by concomitant addition of propidium iodide. Whereas lysines showed virtually no transduction, the transduction ability of arginines increased with the number of consecutive residues and the peptide concentration, with L-R9 and L-R10 performing overall best. We further compared the L- and D-R9 isomers and found that the D-isoform always showed a higher transduction as compared to the L-counterpart in all cell types. Notably, the transduction difference between D- and L-forms was highly variable between cell types, emphasizing the need for protease-resistant peptides as vectors for drug delivery. Real-time kinetic analysis of the D- and L-isomers applied simultaneously to the cells revealed a much faster transduction for the D-variant. The latter underlies the fact that the isomers do not mix, and penetration of one peptide does not perturb the membrane in a way that gives access to the other peptide. Finally, we performed short- and long-term cell viability and cell cycle progression analyses with the protease-resistant D-R9. Altogether, our results identified concentration windows with low toxicity and high transduction efficiency, resulting in fully bioavailable intracellular peptides.

Journal or Publication Title: Journal of peptide science : an official publication of the European Peptide Society
Volume: 14
Number: 4
Divisions: 10 Department of Biology > Cell Biology and Epigenetics
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10 Department of Biology
Date Deposited: 06 Mar 2010 15:51
Official URL: http://www.cardoso-lab.org/publications/Tunnemann%202008.pdf
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