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Dadun > Depósito Académico > CIMA (Centro de Investigación Médica Aplicada) > Área de Terapia génica y Hepatología > Inmunología hepatitis virales > DA - CIMA - Terapia génica y Hepatología - Inmunología hepatitis virales - Artículos de revista >

Poly(methyl vinyl ether-co-maleic anhydride) nanoparticles as innate immune system activators
Authors: Camacho, A.I. (A.I.)
Costa-Martins, R. (Raquel) da
Tamayo, I. (Ibai)
Souza, J. (Juliana) de
Lasarte, J.J. (Juan José)
Mansilla, C. (Cristina)
Esparza, I. (Irene)
Irache, J.M. (Juan Manuel)
Gamazo, C. (Carlos)
Keywords: Nanoparticles
Adjuvant
TLR- agonist
Complement activation
Issue Date: 2011
Publisher: Elsevier
Publisher version: http://dx.doi.org/10.1016/j.vaccine.2011.05.072
ISSN: 0264-410X
Citation: Camacho AI, Da Costa Martins R, Tamayo I, de Souza J, Lasarte JJ, Mansilla C, et al. Poly(methyl vinyl ether-co-maleic anhydride) nanoparticles as innate immune system activators. Vaccine 2011 Sep 22;29(41):7130-7135.
Abstract
Adjuvant research is being oriented to TLR-agonists, but complement activation has been relatively unexplored. In previous studies it was demonstrated that poly(methyl vinyl ether-co-maleic anhydride) nanoparticles (PVMA NPs) used as adjuvant differentially activate dendritic cells through toll like receptors (TLR) stimulation, however, a high dose of these NPs was used. Now, we demonstrated a dose-response effect, with a concentration as low as 20μg/mL able to stimulate TLR2 and TLR4 transfected dendritic cells. In addition, we investigated whether PVMA NPs are able to exploit also the immunomodulatory benefits of complement activation. Results indicated that the hydroxylated surface of these NPs highly activated the complement cascade, as measured by adsorption studies and a complement fixation bioassay. Stable binding of C3b to NPs was confirmed as indicated by lability to SDS treatment after washing resistance. Complement consumption was confirmed as the lytic capacity of complement exposed to NPs was abolished against antibody-sensitized sheep erythrocytes, with a minimal inhibitory concentration of 50μg NPs, equivalent to a surface of 1cm(2). On the contrary, nanoparticles prepared with poly(lactic-co-glycolic acid) (PLGA), used as a reference, did not consume complement at a concentration ≥3mg NPs (≥40cm(2)). Complement consumption was inhibited when PVMA NPs were cross-linked with diamino groups (1,3-diaminopropane), indicating the role of hydroxyl groups as responsible of the phenomenon. These results favour a model whereby PVMA NPs adjuvant activate complement on site to attract immature antigen presenting cells that are activated through TLR2 and TLR4.
Permanent link: http://hdl.handle.net/10171/20362
Appears in Collections:DA - Medicina - Microbiología y Parasitología - Artículos de revista
DA - Farmacia - Tecnología Farmacéutica - Artículos de revista
DA - Medicina - Medicina Interna - Artículos de revista
DA - CIMA - Terapia génica y Hepatología - Inmunología hepatitis virales - Artículos de revista

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