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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Targeting nanosystems to human DCs via Fc Receptor as an Effective Strategy to Deliver Antigen for Immunotherapy
Molecular Pharmaceutics, Volume 8, No. 1, Year 2011
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Description
Dendritic cells (DCs) are increasingly being explored as cellular vaccines for tumor immunotherapy, since they provide an effective system of antigen presentation both in vitro and in vivo. An additional advantage of this cell type is that it is possible to target specific antigens through the activation of receptors, such as FcR (the receptor for the IgG Fc fragment) and TLR (toll-like Receptor). Thus, the uptake capacity of DCs can be improved, thereby increasing antigen presentation. This, in turn, would lead to an enhanced immune response, and, in some instances, the tolerance/anergy of immune effector cells present in cancer patients could be reverted. Here we studied various nanotargeting systems, including liposomes and gold nanoparticles of a peptide-based immunotherapeutic vaccine for the treatment of androgen-responsive prostate cancer. Building blocks of the immunogenic peptide consisted of the luteinizing hormone-releasing hormone (LHRH), also known as gonadotropin- releasing hormone (GnRH) peptide (B- and T-cell epitope), in tandem with a T-helper epitope corresponding to the 830-844 region of tetanus toxoid. Three new peptides with several modifications at the N-terminal (palmitoyl, acetyl, and FITC) were synthesized. These peptides also contained a Cys as C-terminal residue to facilitate grafting onto gold nanoparticles. To target different antigen formulations to human DCs, the Fc was activated with a cross-linking spacer to generate a free thiol group and thus facilitate conjugation onto gold nanoparticles, liposomes, and peptide. Our results show that gold nanoparticles and liposomes targeted to FcRs of human DCs are effective antigen delivery carriers and induce a strong immune response with respect to nontargeted LHRH-TT-nanoparticle conjugates and a superior response to that of naked antigens. In addition, dual labeling using gold and FITC-peptide allowed DC tracking by flow cytometry as well as transmission electron microscopy. Nanoparticles were observed to show a homogeneous distribution throughout the cytoplasm. These results open up a new approach to the development of a novel strategy for cancer vaccines. © 2011 American Chemical Society.
Authors & Co-Authors
Cruz, Luis Javier
Spain, Madrid
Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina
Netherlands, Nijmegen
Radboud University Medical Center
Rueda, Félix
Spain, Barcelona
Universitat de Barcelona
Cordobilla, Begoña
Spain, Barcelona
Universitat de Barcelona
Simón-Gracia, Lorena
Spain, Madrid
Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina
Spain, Barcelona
Irb Barcelona - Institute for Research in Biomedicine
Alberício, Fernando
Spain, Madrid
Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina
Spain, Barcelona
Irb Barcelona - Institute for Research in Biomedicine
Spain, Barcelona
Universitat de Barcelona
Domingo, Joan Carles
Spain, Barcelona
Universitat de Barcelona
Statistics
Citations: 83
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.1021/mp100178k
ISSN:
15438392
Research Areas
Cancer