Abstract
Current vaccine development is highly focused on safer vaccine strategies such as subunit vaccines containing purified parts of the pathogen. However, subunit vaccines suffer from low immunogenicity, often requiring the inclusion of an adjuvant to augment immune responses. Adjuvants boost vaccine efficacy by acting as agonists for pattern-recognition receptors (PRRs), which are present on the cell membrane and in different intracellular compartments of immune cells. The mechanistic insights into PRR activation led to the discovery of several adjuvant molecules that stimulate the immune system by diverse mechanisms. The physicochemical properties associated with these adjuvants and their ability to reach intracellular compartments of immune cells limit their usage. Nanoparticulate delivery systems aid adjuvants in overcoming these issues by enabling efficient encapsulation and precisely delivering them to intracellular compartments while safeguarding them from harsh in vivo conditions. Of note, nanoparticles possess self-adjuvant properties due to their pathogen-mimicking nature. Specifically, nano-adjuvant systems have been widely studied in the development of vaccines against infectious diseases, including the recent coronavirus disease 19 (COVID-19). This chapter focuses on the adjuvants and nano-adjuvant strategies studied for various infectious diseases.
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Abbreviations
- AC:
-
Alpha casein
- AH:
-
Aluminum hydroxide adjuvant
- Algel-IMDG:
-
Alum-absorbed imidazoquinoline
- Alum-TT:
-
Aluminum hydroxide-adsorbed tetanus toxoid
- AP-1:
-
Activator protein-1
- APC:
-
Antigen-presenting cells
- AS:
-
Adjuvant system
- ASP:
-
Angelica sinensis polysaccharide
- CARD:
-
Caspase recruitment domain
- CDNs:
-
Cyclic dinucleotides
- CFA:
-
Complete Freund’s Adjuvant
- cGAMP:
-
Cyclic guanosine monophosphate–adenosine monophosphate
- CLRs:
-
C-type lectin receptors
- CpG ODN:
-
CpG oligodeoxynucleotides
- CpG:
-
Cytosine phosphate-guanine
- CR3:
-
Complement receptor 3
- CSW:
-
Cell wall skeleton
- DAMPs:
-
Danger-associated molecular patterns
- DAP:
-
Diaminopimelic acid
- DCs:
-
Dendritic cells
- dLNs:
-
Draining lymph nodes
- dsRNA:
-
Double-stranded RNA
- ER:
-
Endoplasmic reticulum
- GLA:
-
Glucopyranosyl lipid A
- HA:
-
Hemagglutinin
- HBsAg:
-
Hepatitis B surface antigen
- HIV:
-
Human immunodeficiency virus
- HPV:
-
Human papillomavirus
- HSV:
-
Herpes simplex virus
- IFN:
-
Interferon
- IM:
-
Intramuscular injection
- ISCOMs:
-
Immunostimulatory complexes
- ISRE7:
-
Interferon-stimulated response element 7
- ITAM:
-
Immunoreceptor signaling motif
- LNPs:
-
Lipid nanoparticles
- LPS:
-
Lipopolysaccharide
- LRR:
-
Leucine-rich repeat
- MAIT:
-
Mucosal-associated invariant T
- MALP-2:
-
Macrophage activating lipopeptide
- MAVS:
-
Mitochondria antiviral signaling
- mDCs:
-
Myeloid dendritic cells
- MDP:
-
Muramyl dipeptide
- MHC:
-
Major histocompatibility complex
- MPL:
-
Monophosphoryl lipid A
- MPT:
-
Mycobacterium paratuberculosis
- MyD88:
-
Myeloid differentiation primary response 88
- NHPs:
-
Nonhuman primates
- NK:
-
Natural killer cells
- NLRP3:
-
Pyrin-domain-containing 3
- NLRs:
-
Nod-like receptors
- NP:
-
Nanoparticle
- PAMPs:
-
Pathogen-associated molecular patterns
- pDCs:
-
Plasmacytoid dendritic cells
- PEG-b-PPS:
-
Poly(ethylene glycol)-b-poly(propylene sulfide)
- PI3K:
-
Phosphoinositide 3-kinase
- PLA:
-
Poly(lactic acid)
- PLGA:
-
Poly(lactic-co-glycolic acid)
- poly (I:C):
-
Polyriboinosinic: polyribocytidylic acid (I:C)
- PRRs:
-
Pattern-recognition receptors
- RIG-I:
-
Retinoic acid-inducible gene I
- RIP1:
-
Receptor-interacting serine/threonine-protein kinase 1
- RLRs:
-
RIG-I-like receptors
- ROS:
-
Reactive oxygen species
- SC:
-
Subcutaneous
- STING:
-
Stimulator of interferon genes
- Syk:
-
Spleen tyrosine kinase
- TBK1:
-
TANK-binding kinase 1
- TDB:
-
Trehalose 6,6′-dibehenate
- TLRs:
-
Toll-like receptors
- TRADD:
-
Tumor necrosis factor receptor type 1-associated death domain
- TRAF3:
-
Tumor necrosis factor receptor-associated factors 3
- TRAF6:
-
Tumor necrosis factor receptor-associated factors 6
- TRAM:
-
TRIF-related adapter molecule
- TRIF:
-
Toll/IL-1R domain-containing adaptor-inducing IFN-β
- TT:
-
Tetanus toxoid
- VLP:
-
Virus-like particles
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Misra, B., Hughes, K.A., Bobbala, S. (2023). Nano-Adjuvants. In: Patravale, V.B., Date, A.A., Jindal, A.B. (eds) Nanomedicines for the Prevention and Treatment of Infectious Diseases. AAPS Advances in the Pharmaceutical Sciences Series, vol 56. Springer, Cham. https://doi.org/10.1007/978-3-031-39020-3_10
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