PubMed Health⌕ Search

PubMed · 16823941

Adjuvants: present regulatory challenges.

Abstract

Research on new adjuvants and delivery systems has expanded dramatically in the last decade. New generation vaccines, based on recombinant proteins, synthetics, and conjugated antigens have emerged but they have limitations because of their poor immunogenic properties, and therefore more cooperative adjuvants for the promotion of the immune response are required. Different molecules have been screened for their ability to enhance the immune response to vaccine antigens, e.g. liposomes, protein cochleate formulations, ISCOMs and cytokines, to name the few. However, most of the vaccines that are currently licensed use aluminum salts or calcium phosphate.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Danay Mora Pascual, Rolando Dominguez Morales, Erich Duque Gil, Lázara Martínez Muñoz, Juliette Escoto López, Olga L Jacobo Casanueva. 2006-04-12. Adjuvants: present regulatory challenges.. https://doi.org/10.1016/j.vaccine.2005.01.136

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

Immunostimulatory RNA oligonucleotides trigger an antigen-specific cytotoxic T-cell and IgG2a response.

Single-stranded RNA oligonucleotides containing an immunostimulatory motif (immunostimulatory RNA [isRNA]) are potent inducers of interferon-alpha via the Toll-like receptor 7. We investigated the effect of isRNA on the development of an immune response. We show that isRNA activates dendritic cells and induces production of Th1-type cytokines both in vitro and in vivo. Cytokine production led to bystander activation of T and B cells. We further demonstrate that isRNA triggers the generation of antigen-specific cytotoxic T cells and of an IgG2a-biased antibody response to antigen in a sequence-dependent manner. In summary, we provide evidence for the first time that isRNA oligonucleotides can simultaneously activate the innate and adaptive arms of the immune system.

Adjuvants, Immunologic↗

Mechanism of third signals provided by IL-12 and OX-40R ligation in eliciting therapeutic immunity following dendritic-tumor fusion vaccination.

Dendritic-tumor heterokaryons generated by electrofusion are highly immunogenic. In animal studies, a single vaccination was therapeutic for tumors established in the lung, skin, and brain. However, effective therapy required a third signal which could be provided by exogenous IL-12 or the agonistic anti-OX-40R monoclonal antibody (mAb). In this study, we investigated the mechanism and mode of actions of these two seemingly distinct adjuvants. In immunotherapy of the MCA205 sarcoma, administration of the neutralizing anti-IL-12 mAb nearly completely blocked the adjuvant effect of IL-12, but had minimal inhibitory effects on anti-OX-40R mAb. By contrast, in vivo administration of the antagonistic anti-OX-40L mAb inhibited the adjuvant effects of both IL-12 and anti-OX-40R mAb. Thus, a common pathway of endogenous OX-40 interaction is critical for the development of a therapeutic immune response. Analysis of the third signal mechanism revealed that in the absence of an adjuvant, vaccination with fusion hybrids led to IL-10 production without eliciting IFN-gamma secreting cells. The addition of IL-12 to vaccination suppressed IL-10 production and initiated sensitization of specific IFN-gamma secreting cells, resulting in a type 1-like antitumor immunity. These findings underscore the significance of the third signal in the design of dendritic cell-based cancer vaccines.

Adjuvants, Immunologic↗