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In vivo proinflammatory activity of generations 0–3 (G0–G3) polyamidoamine (PAMAM) nanoparticles

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Abstract

Objective and design

The aim of this study was to determine whether different generations (G) polyamidoamine (PAMAM) dendrimers possess proinflammatory activities in vivo.

Material or subjects

Several hundred female CD-1 mice were used to test four different PAMAM dendrimers using the murine air pouch model.

Treatment

Mice received appropriate negative and positive controls or G0-G3 PAMAM nanoparticles at 100 and 500 µg/ml into air pouches.

Methods

Exudates were harvested after 3, 6, 24 and 48 h. Cell pellets and supernatants were used to determine the number of total leukocytes and neutrophils and to detect the production of several analytes by an antibody array approach, respectively. One-way analysis of variance was used for statistical analysis.

Results

PAMAM dendrimers rapidly increased a leukocyte influx after 3 h, the vast majority of cells being neutrophils. This was also observed after 6 and 24 h, and resolution of inflammation was noted after 48 h. In general, the increased production of a greater number of analytes detected in the exudates after 6 h correlated with the number of dendrimer generations (G3 > G2 > G1 > G0).

Conclusions

PAMAM dendrimers devoid of any delivering molecules possess proinflammatory activities in vivo by themselves, probably via the production of different chemokines released by air pouch lining cells.

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Acknowledgments

The study was supported by grants from the Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRSST).

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Authors and Affiliations

  1. Laboratoire de Recherche en Inflammation et Physiologie des Granulocytes, Université du Québec, INRS-Institut Armand-Frappier, 531 boul. des Prairies, Laval, QC, H7V 1B7, Canada

    Isabelle Durocher & Denis Girard

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  1. Isabelle Durocher
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Correspondence to Denis Girard.

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Responsible Editor: John Di Battista.

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Durocher, I., Girard, D. In vivo proinflammatory activity of generations 0–3 (G0–G3) polyamidoamine (PAMAM) nanoparticles. Inflamm. Res. 65, 745–755 (2016). https://doi.org/10.1007/s00011-016-0959-5

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  • DOI: https://doi.org/10.1007/s00011-016-0959-5

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