Trends in adjuvant development for vaccines: DAMPs and PAMPs as potential new adjuvants

“The TLRs11-13 have been lost from the human genome (13).”

“Mice do not present a functional TLR10 due to an insertional mutagenesis of a retrovirus but have additional TLRs (TLRs11-13), besides those in common with man (TLRs1-9).”

“The recruitment of procaspase-1 by NLRP3 is mediated by another molecule, apoptosis-associated speck-like (ASC) protein containing a CARD, via interaction with the NLRP3 pyrin domain, resulting in the multimeric structure of the inflammasome (Figure 3) (26,27).”

“Activation of the inflammasome by molecules recognized by NLRP3 will catalyze the processing of the IL-1β precursor induced by TLR-dependent mechanisms (26,30-32).”

“Whereas stimulation of NOD1 and NOD2 (Figure 1), members of the NLR family, results primarily in the activation of the pro-inflammatory gene expression response (25), other NLRs (like NLRP3), activate the caspase-1 that processes the inactive IL-1β and IL-18 precursors and eventually results in the secretion of the IL…”

“NLRs include a large family of intracellular sensors that can detect both pathogens and stress signals (24).”

“It leads to a very high antibody response with a Th2 profile against the antigen in mice, and in humans the immune response tends to be a mix of Th2 and Th1 cells (39,40).”

“Activation of the inflammasome by molecules recognized by NLRP3 will catalyze the processing of the IL-1β precursor induced by TLR-dependent mechanisms (26,30-32).”

“Whereas stimulation of NOD1 and NOD2 (Figure 1), members of the NLR family, results primarily in the activation of the pro-inflammatory gene expression response (25), other NLRs (like NLRP3), activate the caspase-1 that processes the inactive IL-1β and IL-18 precursors and eventually results in the secretion of the IL…”

“In this pathway, the transcription factor interferon regulatory factor 5 is also activated and translocated to the nucleus and binds to interferon-stimulated response element regions present in the promoter segments of pro-inflammatory cytokines (13,21).”

“Bacterial flagellin is recognized by TLR5 and cytosolic and monomeric flagellin is recognized by Ipaf from the NLR innate system (33,34).”

“Bacterial flagellin is recognized by TLR5 and cytosolic and monomeric flagellin is recognized by Ipaf from the NLR innate system (33,34).”

“The first one involves the adaptor molecules TIRAP and MyD88 when pathogen-induced dimerization of TLR4 recruits MyD88 molecules and IRAK kinase enzymes that hierarchically assemble into a left-handed helical oligomerized tower for proper signal transduction, triggering NF-κB activation and pro-inflammatory cytokine g…”

“Whereas stimulation of NOD1 and NOD2 (Figure 1), members of the NLR family, results primarily in the activation of the pro-inflammatory gene expression response (25), other NLRs (like NLRP3), activate the caspase-1 that processes the inactive IL-1β and IL-18 precursors and eventually results in the secretion of the IL…”

“Interestingly, interferon regulatory factor 5 is involved in the transcription of proinflammatory cytokines by all TLRs tested so far (22).”

“Other interesting reviews on RLRs or CLRs can be found elsewhere (6-12).”

“PR OV IS IO NA L findings are contributing to the understanding of how exogenous and endogenous factors activate TLRs and, although some evidence shows some overlap in the molecular machinery, DAMPs present some distinct mechanisms to PAMPs, resulting in different outcomes (19).”

“Therefore, new trends in vaccine developments include the use of new adjuvants (PAMPs or DAMPs) based on new PRR agonists as well as the combination of these adjuvants, aiming at the programming of the magnitude and persistence of the desired immune response (55).”

“It is interesting to note that while binding of LPS to TLR4 activates both the MyD88-TIRAP and TRIF-TRAM pathways (Figure 2), MPL was shown to activate only the TRIFTRAM pathway, which accounts for its adjuvant properties and low toxicity (23).”

“The innate immune system is phylogenetically more ancient and is the first line of defense (5), being able to induce a rapid and nonspecific response to the encounter of a pathogen, in contrast to the adaptive immune system, which depends on B and T lymphocytes.”

“The use of AS02, an oil (squalene)-in-water emulsion of monophosphoryl lipid and the saponin QS21, has led to some level of protection in immunized individuals (53).”

“Thirteen TLRs have been identified in mammals, which can recognize many structurally different ligands through their distinct extra-domain (13,14).”

“It leads to a very high antibody response with a Th2 profile against the antigen in mice, and in humans the immune response tends to be a mix of Th2 and Th1 cells (39,40).”

“Current pneumococcal conjugate vaccines are able to reduce both carriage and invasive disease caused by serotypes included in the formulations; however, the replacement of prevalent serotypes with non-vaccine serotypes has taken place and has led to reduced efficacy after some years of widespread use in children (59,6…”

“Whereas stimulation of NOD1 and NOD2 (Figure 1), members of the NLR family, results primarily in the activation of the pro-inflammatory gene expression response (25), other NLRs (like NLRP3), activate the caspase-1 that processes the inactive IL-1β and IL-18 precursors and eventually results in the secretion of the IL…”

“Current pneumococcal conjugate vaccines are able to reduce both carriage and invasive disease caused by serotypes included in the formulations; however, the replacement of prevalent serotypes with non-vaccine serotypes has taken place and has led to reduced efficacy after some years of widespread use in children (59,6…”

“Whereas stimulation of NOD1 and NOD2 (Figure 1), members of the NLR family, results primarily in the activation of the pro-inflammatory gene expression response (25), other NLRs (like NLRP3), activate the caspase-1 that processes the inactive IL-1β and IL-18 precursors and eventually results in the secretion of the IL…”

“In vivo, immunization of MyD88-/- mice with YF17D led to diminished numbers of CD4+ and CD8+ T cells expressing IFN-γ (37).”

“Interestingly, NLRP3 directly binds ATP and mutation of the nucleotide-binding domain of NLRP3 reduces ATP binding, caspase-1 activation, IL-1 production, cell death, macromolecular complex formation, self-association, and association with the inflammasome component ASC, suggesting a crucial role of ATP in inflammasom…”

“Though several developed countries have now replaced it with an acellular formulation composed of purified proteins from Bordetella pertussis, the Pan American Health Organization concluded that there is no reason for Latin American countries to change from cellular to acellular vaccines based on safety and costeffect…”

“Whereas stimulation of NOD1 and NOD2 (Figure 1), members of the NLR family, results primarily in the activation of the pro-inflammatory gene expression response (25), other NLRs (like NLRP3), activate the caspase-1 that processes the inactive IL-1β and IL-18 precursors and eventually results in the secretion of the IL…”

“The use of AS02, an oil (squalene)-in-water emulsion of monophosphoryl lipid and the saponin QS21, has led to some level of protection in immunized individuals (53).”

“Nevertheless, alum is a poor inducer of protective Th1-associated immune response, an important feature for the development of vaccines against intracellular pathogens (41).”

“Other interesting reviews on RLRs or CLRs can be found elsewhere (6-12).”

“Whereas stimulation of NOD1 and NOD2 (Figure 1), members of the NLR family, results primarily in the activation of the pro-inflammatory gene expression response (25), other NLRs (like NLRP3), activate the caspase-1 that processes the inactive IL-1β and IL-18 precursors and eventually results in the secretion of the IL…”

“Other interesting reviews on RLRs or CLRs can be found elsewhere (6-12).”

“The combination of adjuvants is thus a very promising approach and some formulations are already approved for human use, such as the vaccines against human papilloma virus (HPV) and hepatitis B virus combined with AS04 (Table 2) (52).”

“It has been shown that antigens adsorbed to alum are presented as a particulate form, enhancing internalization by APCs (42).”

“Furthermore, HMGB1 can also mediate LPS transfer to CD14 to initiate a TLR4-mediated pro-inflammatory response, illustrating the complexity of interactions involving PAMPs, DAMPs and endogenous activators (18).”

“Other interesting reviews on RLRs or CLRs can be found elsewhere (6-12).”

“Aluminum salts (alum) were the first adjuvants licensed for human vaccines in the 1920’s and the licensure of novel adjuvants took about 80 years (4).”

“A complex composed of two copies of TLR4-MD-2-LPS initiates the cascade of intracellular signaling (17).”

“Whereas stimulation of NOD1 and NOD2 (Figure 1), members of the NLR family, results primarily in the activation of the pro-inflammatory gene expression response (25), other NLRs (like NLRP3), activate the caspase-1 that processes the inactive IL-1β and IL-18 precursors and eventually results in the secretion of the IL…”

“Although signaling through TLR4 has been implicated in the immunomodulation by PT (69-71), proliferation of lymphocytes can also be observed in TLR4 knockout mice, thus suggesting other routes of activation (72).”

“Vaccines can be composed of live attenuated organisms, killed whole-cell organisms or subunit components (3).”

“It induces a polyvalent immune response that includes the production of cytotoxic T cells, a mixed Th1/Th2 cell profile and neutralizing antibodies that can persist up to 40 years (36).”

“In contrast to wP, acellular pertussis vaccines, which are composed of pertussis proteins, including PT and FHA, have been shown to decrease the immune response to combined vaccines (74,75).”

“For instance, NLRP3 can be activated by ATP and K+ efflux, by crystalline/particulate ligands and by reactive oxygen species (28).”

“CD80/CD86, CD40, CD54 and CD58 on APCs bind to CD28, CD154, CD11a, CD2 on T cells, respectively, establishing a complex and a close interaction (immunological synapse) between the cells (35).”

“Activation of the inflammasome by molecules recognized by NLRP3 will catalyze the processing of the IL-1β precursor induced by TLR-dependent mechanisms (26,30-32).”

“Other interesting reviews on RLRs or CLRs can be found elsewhere (6-12).”

“Other interesting reviews on RLRs or CLRs can be found elsewhere (6-12).”

“pertussis proteins act by subverting the immune system during infection (62,63).”

“In contrast to wP, acellular pertussis vaccines, which are composed of pertussis proteins, including PT and FHA, have been shown to decrease the immune response to combined vaccines (74,75).”

“Other TLR agonists are also being tested for use as adjuvants, such as immunostimulatory molecules containg repeating sequences of cytosine phophoguanosine dinucleotides targeting TLR9 and the TLR7/8 agonists imiquimod and resiquimod (51).”

“Although signaling through TLR4 has been implicated in the immunomodulation by PT (69-71), proliferation of lymphocytes can also be observed in TLR4 knockout mice, thus suggesting other routes of activation (72).”

“Furthermore, HMGB1 can also mediate LPS transfer to CD14 to initiate a TLR4-mediated pro-inflammatory response, illustrating the complexity of interactions involving PAMPs, DAMPs and endogenous activators (18).”

“Single inoculation of FHA can induce total antibody production and the secretion of MIP-3α, a chemokine involved in the recruitment of dendritic cells to the site of inoculation.”

“Although signaling through TLR4 has been implicated in the immunomodulation by PT (69-71), proliferation of lymphocytes can also be observed in TLR4 knockout mice, thus suggesting other routes of activation (72).”

“Furthermore, the lower LPS content of wPlow did not significantly alter the adjuvant activity (61).”

“In contrast to wP, acellular pertussis vaccines, which are composed of pertussis proteins, including PT and FHA, have been shown to decrease the immune response to combined vaccines (74,75).”

“Moreover, this MPL combined with seasonal or pandemic influenza vaccines was effective in mice and was able to reduce the amount of antigen necessary for achieving protective titers (76,77).”

“This new vaccine was shown to be safe and to induce similar immune responses in a phase I clinical trial and is a good candidate for replacing the classical wP (58).”

“Mice do not present a functional TLR10 due to an insertional mutagenesis of a retrovirus but have additional TLRs (TLRs11-13), besides those in common with man (TLRs1-9).”

“Again, rinderpest in cattle is being eradicated through the use of an attenuated goat-adapted virus developed by Walter Plowright through serial passages of the pathogen in tissue culture (1).”

“Moreover, this MPL combined with seasonal or pandemic influenza vaccines was effective in mice and was able to reduce the amount of antigen necessary for achieving protective titers (76,77).”

“The pertussis toxin (PT) is probably the best characterized among them and has been shown to increase immune responses against co-administered antigens both through the mucosal and parenteral routes of inoculation (64,68).”

“Interestingly, some of these components have already been described for their adjuvant properties when combined with antigens (64-67).”

“Interestingly, some of these components have already been described for their adjuvant properties when combined with antigens (64-67).”

“The pertussis toxin (PT) is probably the best characterized among them and has been shown to increase immune responses against co-administered antigens both through the mucosal and parenteral routes of inoculation (64,68).”

“This will be the first veterinary infectious disease and also the second human disease eliminated from the face of the planet (2).”

“Other interesting reviews on RLRs or CLRs can be found elsewhere (6-12).”

“Although signaling through TLR4 has been implicated in the immunomodulation by PT (69-71), proliferation of lymphocytes can also be observed in TLR4 knockout mice, thus suggesting other routes of activation (72).”

“The filamentous hemagglutinin (FHA) has also been shown to increase antibody responses towards different antigens when administered to mice through mucosal routes (67).”

“This is an important concern for maintaining high levels of confidence in vaccines (78), which are usually greater among populations in developing countries than in industrialized countries (79).”

“…and complete immunity, mucosal adjuvant and delivery vehicle High cost The presence of PAMPs; induction of danger molecules and the “geographic concept” Leo et al., 2015 of the antigen presenting cells (ACPs) and activate naïve T cells, thereby activating the immune system (Miyaji et al., 2011).”

“These molecules recruit the APCs and are the key molecules linking the innate and adaptive immune systems (Miyaji et al., 2011).”

“presentation of antigenic peptides bound to MHC molecules [6].”

“This induction may be through pathogen-associated molecular patterns (PAMPs) on OMVs that can activate the immune system (Miyaji et al., 2011).”

“Pathogen-associated molecular patterns (PAMPs) are often incorporated as adjuvants in vaccines (Miyaji et al., 2011).”

“Following PAMPs and DAMPs mediated triggering of the innate immune system via PRRs, the release of pro-inflammatory cytokines leads to the stimulation of the adaptive immune system (Miyaji et al., 2011).”

“It has been demonstrated that inflammasomes, which can recognize damage-associated molecular patterns (DAMPs), are also involved in the mechanisms of adjuvant action [24].”

“Maturation of APCs is essential for priming antigen-specific naive T cells, influencing both the magnitude and the type of the T and B cell responses as well as the induction of memory cells (2).”

“PAMPs trigger TLR signaling in APCs and have important roles in subsequent T cell differentiation and adaptive immunity [37].”

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“PAMPs, either in purified form or synthetic PAMP analogues, can exert potent effects via pattern recognition receptors (PRRs), expressed on cells of the innate and adaptive systems [73].”

“Current candidate adjuvants include those carrying danger-associated molecular patterns and pathogen-associated molecular patterns (11).”

“Several molecules from microorganisms, known as pathogen-associated molecular patterns (PAMPs), can be recognized through the binding to receptors from the innate immune system, the pattern recognition receptors (PRRs), leading to the stimulation of both the innate and adaptative immune responses [80].”

“…other candidates of PAMP 329 receptors expressed on APCs are C-type lectin receptors, nucleotide-binding oligomerization 330 domain and leucine-rich-repeat-containing receptors, and retinoic acid-inducible gene-1-like 331 receptors (Lavelle et al., 2010; Miyaji et al., 2011; Mahla et al., 2013).”

“Recently, PAMPs have been popularly investigated as adjuvant materials [2, 3].”

“Since alum and AddaVax are known to induce slight cytotoxicity and are DAMP-inducible adjuvants 36,37 , it is speculated that base materials #1 – 8 are also DAMP-inducible adjuvants.”

“Despite being safer, recombinant proteins are poor immunogens and require adjuvants added to the vaccine formulation to enhance the immune responses and provide greater defense against the target pathogen (Miyaji et al., 2011; Reed et al., 2013).”

“However, unfortunately, subunit vaccines often have a rather weak immunogenicity, due to lack of the immunostimulatory components broadly shared by pathogens while being distinguishable from host molecules, which are collectively referred to as pathogen-associated molecular patterns (PAMPs) [15] able to bind to and tr…”

“Hepatitis B virus surface antigen (HBsAg) has several antigenic epitopes binding to aluminum adjuvants through ligand switching mechanism (1-5).”

“immune triggers: PAMPs and damage-associated molecular patterns (DAMPs) (114) that can stimulate the immune system through PRR activation in APCs such DCs and indirectly by PRR activation in bystander cells (Figure 6.”