Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines


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Upon exposure to an immune stimulus adjuvant , the innate immune system is rapidly induced to produce proinflammatory cytokines and activate APCs. When this occurs in the presence of a foreign antigen vaccine , antigen processing and presentation is facilitated leading to the efficient induction of an adaptive immune response.

The history of adjuvant discovery can be considered a mix of alchemy and serendipity because the mechanisms of action of most adjuvants remain only partially understood. Both alum and MF59 are known to induce humoral Th2 responses over Th1 cellular immunity. Many natural adjuvants are also used experimentally, and those range from whole bacteria e.

Recently, several synthetic immune potentiators have shown utility as adjuvants. These new synthetic immune potentiators hold promise because they are amenable to optimization in both their potency and toxicity profiles. However, the wealth of new information regarding innate immune mechanisms indicates that these first generation immune potentiators have only begun to scratch the surface and there is still much to be done in the field of selectively manipulating the innate immune response.

The diversity of both natural and synthetic immune potentiators suggests that discovery of new adjuvants can proceed on two fronts: directed efforts to optimize existing structures based on knowledge of the innate immune system and random screening for active compounds without regard to their structure. Many experimental adjuvants have advanced to clinical trials and some have demonstrated high potency, but most have proven too toxic for routine human use. For prophylactic immunization in healthy individuals, only adjuvants that induce minimal adverse effects will prove acceptable, although in the context of biodefence these safety hurdles may be somewhat lower, at least initially.


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Nevertheless, as more potent adjuvants become available their potential for toxicity needs to be monitored closely. Hence, an important contribution of vaccine delivery systems will be to increase the therapeutic indices of adjuvants by limiting their distribution in vivo in order to focus responses locally rather than systemically. The combination of improved immune potentiators adjuvants and delivery systems may enhance the immune response to vaccine antigens in several different ways: i increase the immunogenicity of weak antigens; ii enhance the speed and duration of the immune response; iii modulate antibody avidity, specificity, isotype or subclass distribution; iv stimulate CMI; v promote the induction of mucosal immunity; vi enhance immune responses in immunologically immature, or senescent individuals; vii decrease the dose of antigen in the vaccine, reducing the cost and increasing the ease of production; and viii help to overcome antigen competition in combination vaccines.

For biodefence emergencies, all of these effects are important. However, taking on all of these areas for improvement simultaneously is a daunting task, especially when considering potential concerns about toxicity.

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Therefore, these particulates are internalized efficiently by phagocytic cells of the immune system and function mainly to deliver associated antigen into these key cells. Th2 for antibody responses or Th1 for CMI responses.


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The mode of action of adjuvant delivery is not yet known, but may involve codelivery of antigen and adjuvant to APCs and more efficient delivery of adjuvant to TLR. The threat of intentional use of biological weapons provides the impetus to improve existing biodefence vaccines e. This could be in the form of existing technologies newly applied to the target of interest e.

Second, for the medium term, new technologies will be applied to existing vaccines or adjuvants to increase their potency e.

Production Technology for Vaccines and Adjuvants - Course Unit - University of Coimbra

Volume 5 , Issue The full text of this article hosted at iucr. If you do not receive an email within 10 minutes, your email address may not be registered, and you may need to create a new Wiley Online Library account. If the address matches an existing account you will receive an email with instructions to retrieve your username. Cellular Microbiology. Free Access. Nicholas M.

Search for more papers by this author. Derek T. Jeffrey B. For correspondence.

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Tools Request permission Export citation Add to favorites Track citation. Dendritic cells and interleukin 12 as adjuvants for tumor-specific vaccines. Mayordomo, J. Bone marrow-derived dendritic cells serve as potent adjuvants for peptide-based antitumor vaccines. Stem Cells 15 , 94— Martin-Fontecha, A. Recent advances in the discovery and delivery of vaccines and adjuvants. Nakao, Y. Surface-expressed TLR6 participates in the recognition of diacylated lipopeptide and peptidoglycan in human cells.

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Sandor, F. Jurk, M. Roberts, T. Pink, J. Dillon, S. A Toll-like receptor 2 ligand stimulates Th2 responses in vivo , via induction of extracellular signal-regulated kinase mitogen-activated protein kinase and c-Fos in dendritic cells. Download references. Correspondence to Jeffrey B Ulmer. All three authors authors are employed by Chiron Corporation, and Nicholas M. Valiante and Jeffrey B. Ulmer hold stock in the company.

Reprints and Permissions. Pashine, A. Targeting the innate immune response with improved vaccine adjuvants. Nat Med 11, S63—S68 doi Download citation. Journal of Materials Chemistry B Nano Today Molecular Therapy - Nucleic Acids Infection and Immunity Advanced search. Skip to main content.

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Abstract Despite two centuries of vaccine use, only a few adjuvants and delivery systems are licensed for human use. Rent or Buy article Get time limited or full article access on ReadCube. Figure 1: Signaling through the receptors of the innate immune system. Figure 2: Initiation of the immune response. Figure 3: Rational approach to adjuvant discovery. References 1 Hilleman, M. Article Google Scholar 3 Hoebe, K.

Google Scholar 5 Medzhitov, R. Article Google Scholar 22 Pasare, C. Google Scholar 28 Gupta, R. Article Google Scholar 49 Dillon, S. Acknowledgements We gratefully acknowledge N. Cronen for preparation of illustrations. Rights and permissions Reprints and Permissions. About this article Cite this article Pashine, A.

Antibiotics, Antivirals, and Vaccines

Blanchard , Kristin H. Loomis , Sushma M. Mehrizi , Navid D. Adams Infection and Immunity Nature Medicine menu. Description Development of new-generation vaccines is now more challenging than ever, as identifying, purifying and evaluating vaccine antigens is a complex undertaking.

Most importantly, once the relevant antigens have been identified, key focus then shifts to the development of suitable delivery systems and formulations to achieve maximum in vivo potency with minimum potential side effects. These novel formulations-many of which will be nanoparticulates-can deliver the antigens to the desired site, to the relevant antigen presenting cells, and prevent systemic exposure of the immune potentiators. The proposed book will outline all the critical steps that need to be considered for successful development of various types of nanoparticulate delivery systems for vaccine antigens.

These contributions from leading experts in the area of vaccine formulation and delivery systems will tie in what is the most current status, including clinical evaluations with these novel vaccine technologies. Product details Format Paperback pages Dimensions x x Illustrations note X, p. Table of contents Critical parameters that govern the optimization of vaccine formulations.

Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines
Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines
Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines
Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines
Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines
Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines Novel Immune Potentiators and Delivery Technologies for Next Generation Vaccines

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