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In immunology, an adjuvant is an agent that may stimulate the immune system and increase the response to a vaccine, without having any specific antigenic effect in itself. Immunology is a broad branch of biomedical Science that covers the study of all aspects of the Immune system in all Organisms It deals with An immune system is a collection of mechanisms within an Organism that protects against Disease by identifying and killing Pathogens and Tumor A vaccine is a biological preparation which is used to establish or improve immunity to a particular disease An antigen (from antibody-generating) or immunogen is a substance that prompts the generation of Antibodies and can cause an immune response [1] The word “adjuvant” comes from the Latin word adjuvare, meaning to help or aid. [2] "An immunologic adjuvant is defined as any substance that acts to accelerate, prolong, or enhance antigen-specific immune responses when used in combination with specific vaccine antigens. "[3]

Adjuvants have been called the dirty little secret of vaccines [4] in the scientific community, as much about how adjuvants work is a mystery. Known adjuvants include oils, aluminum salts and virosomes.

Contents

Overview

Adjuvants in immunology are often used to modify or augment the effects of a vaccine by stimulating the immune system to respond to the vaccine more vigorously, and thus providing increased immunity to a particular disease. Immunology is a broad branch of biomedical Science that covers the study of all aspects of the Immune system in all Organisms It deals with A vaccine is a biological preparation which is used to establish or improve immunity to a particular disease An immune system is a collection of mechanisms within an Organism that protects against Disease by identifying and killing Pathogens and Tumor An immune system is a collection of mechanisms within an Organism that protects against Disease by identifying and killing Pathogens and Tumor A disease is an abnormal condition of an organism that impairs bodily functions and can be deadly Adjuvants accomplish this task by mimicking specific sets of evolutionarily conserved molecules which include liposomes, lipopolysaccharide (LPS), molecular cages for antigen, components of bacterial cell walls, and endocytosed nucleic acids such as double-stranded RNA (dsRNA), single-stranded DNA (ssDNA), and unmethylated CpG dinucleotide-containing DNA. eVolution is the third Album by eLDee, it was due to be released in 2008 A liposome is a tiny bubble ( vesicle) made out of the same material as a cell membrane. Lipopolysaccharides ( LPS) are large Molecules consisting of a Lipid and a Polysaccharide joined by a Covalent bond; they are found An antigen (from antibody-generating) or immunogen is a substance that prompts the generation of Antibodies and can cause an immune response A cell wall is a tough flexible and sometimes fairly rigid layer surrounding a cell, located external to the Cell membrane, which provides the cell with structural Ribonucleic acid ( RNA) is a Nucleic acid that consists of a long chain of Nucleotide units Ribonucleic acid ( RNA) is a Nucleic acid that consists of a long chain of Nucleotide units Deoxyribonucleic acid ( DNA) is a Nucleic acid that contains the genetic instructions used in the development and functioning of all known CpG sites are regions of DNA where a Cytosine Nucleotide occurs next to a Guanine nucleotide in the linear sequence of bases Deoxyribonucleic acid ( DNA) is a Nucleic acid that contains the genetic instructions used in the development and functioning of all known [5] Because immune systems have evolved to recognize these specific antigenic moieties, the presence of adjuvant in conjunction with the vaccine can greatly increase the innate immune response to the antigen by augmenting the activities of dendritic cells (DCs), lymphocytes and macrophages by mimicking a natural infection. eVolution is the third Album by eLDee, it was due to be released in 2008 An antigen (from antibody-generating) or immunogen is a substance that prompts the generation of Antibodies and can cause an immune response Immune system|Adaptive immune systemThe innate immune system comprises the cells and mechanisms that defend the host from infection by other organisms in a non-specific manner Dendritic cells (DCs are Immune cells and form part of the Mammalian Immune system. A lymphocyte is a type of White blood cell in the Vertebrate Immune system. Macrophages ( Greek: "big eaters" from makros "large" + phagein "eat" ( Mø) are cells within the tissues that Nature, in the broadest sense is equivalent to the natural world, physical universe, material world or material universe. An infection is the detrimental Colonization of a host Organism by a foreign Species. [6] Furthermore, because adjuvants are attenuated beyond any function of virulence, they pose little or no independent threat to a host organism. Virulence (also called pestiferousness) refers to the degree of Pathogenicity of a Microbe, or in other words the relative ability of a Microbe In Biology, a host is an organism that harbors a Virus or Parasite, or a mutual or Commensal Symbiont, typically providing nourishment

Inorganic adjuvants

Aluminium salts

There are many adjuvants, some of which are inorganic (such as alum), that also carry the potential to augment immunogenicity. Traditionally inorganic compounds are considered to be of mineral not biological origin For the purely-slang term alum meaning "graduate" see Alumnus. Immunogenicity is the ability of a particular substance which is called the Antigen, to provoke an Immune response. [7][8] Two common salts include aluminum phosphate and aluminum hydroxide. Aluminium phosphate ( Al[[Phosphorus P]] O4) is a Chemical compound. Aluminium hydroxide, Al(OH3 is the most stable form of Aluminium in normal conditions These are the most common adjuvants in human vaccines.

Organic adjuvants

While Aluminium salts are popularly used in human vaccines, the organic compound Squalene is also used. Squalene is a natural Organic compound originally obtained for commercial purposes primarily from Shark liver oil, though there are botanic sources as well including However, organic adjuvants are more commonly used in animal vaccines.

Oil-based

Oil-based adjuvants are commonly used in some veterinary vaccines.

Virosomes

Another market-approved adjuvant and carrier system are virosomes. A virosome is a unilamellar phospholipid bilayer vesicle with a mean diameter of 150 nm [9] During the last two decades, a variety of technologies have been investigated to improve the widely-used adjuvants based on aluminum salts. [10] These salts are unfavorable, since they develop their effect by inducing local inflammation, which is also the basis for the extended side-effect pattern of this adjuvant. In contrast, the adjuvant capabilities of virosomes are independent of any inflammatory reaction. Virosomes contain a membrane-bound hemagglutinin and neuraminidase derived from the influenza virus, and serve to amplify fusogenic activity and therefore facilitate the uptake into antigen presenting cells (APC) and induce a natural antigen-processing pathway. Hemagglutinin (HA or haemagglutinin ( British English) is an Antigenic Glycoprotein found on the surface of the Influenza Viruses Sialidase 1 (lysosomal sialidase, also known as NEU1 or neuraminidase, is a human Gene. The delivery of the antigen by virosomes to the immune system in a way that mimics a natural path may be a reason why virosome-based vaccines stand out due to their excellent safety profile. [11]

Experimental adjuvants

An increasing number of vaccines with squalene and phosphate adjuvants are being tested on humans. [12] The compound QS21 is under investigation as a possible immunological adjuvant[13] as is Novartis' (formerly Chiron) MF59. QS21 is a plant extract that may improve the ability of the Immune system to respond to Disease. [14]

Adjuvants and the adaptive immune response

One misconception concerning adjuvant function is that an adjuvant-enhanced innate immune response should affect only the transitory reaction of the innate immune response and not the more long-lived effects of the adaptive immune response. Immune system|Adaptive immune systemThe innate immune system comprises the cells and mechanisms that defend the host from infection by other organisms in a non-specific manner Immune system|Passive immunity|Innate immune system The adaptive immune system is composed of highly specialized systemic cells and processes that eliminate or prevent Pathogenic Although it may appear fitting to separate the two systems, it is however important to realize the interconnected nature of the two systems. System (from Latin systēma, in turn from Greek systēma is a set of interacting or interdependent Entities, real or abstract When the amount of communication that takes place between the innate immune response and the adaptive immune response with the onset of infection is considered it becomes difficult to separate the two systems. Communication is the process of conveying information from a sender to a receiver with the use of a medium in which the communicated information is understood the same way An infection is the detrimental Colonization of a host Organism by a foreign Species.

In order to understand the links between the innate immune response and the adaptive immune response to help substantiate an adjuvant function in enhancing adaptive immune responses to the specific antigen of a vaccine, the following points should be considered:

This process carried out by both DCs and macrophages is termed antigen presentation and represents a physical link between the innate and adaptive immune responses. Antigen presentation is a process in the body's Immune system by which Macrophages, Dendritic cells and other cell types capture Antigens and

Upon activation, mast cells release heparin and histamine to effectively increase trafficking to and seal off the site of infection to allow immune cells of both systems to clear the area of pathogens. A mast cell (or mastocyte) is a resident cell of several types of tissues and contains many granules rich in Histamine and Heparin Heparin, a highly-sulfated Glycosaminoglycan, is widely used as an injectable Anticoagulant and has the highest negative Charge density of any known Histamine is a Biogenic amine involved in local immune responses as well as regulating physiological function in the gut and acting as a Neurotransmitter An infection is the detrimental Colonization of a host Organism by a foreign Species. In addition, mast cells also release chemokines which result in the positive chemotaxis of other immune cells of both the innate and adaptive immune responses to the infected area. Chemokines are a family of small Cytokines, or Proteins secreted by cells Proteins are classified as chemokines according to shared structural characteristics Chemotaxis, a kind of Taxis, is the phenomenon in which bodily cells bacteria, and other single-cell or Multicellular organisms direct their movements [17][18]

Due to the variety of mechanisms and links between the innate and adaptive immune response, an adjuvant-enhanced innate immune response results in an enhanced adaptive immune response. Specifically, a recent study has observed that adjuvants may exert their immune-enhancing effects according to five immune-functional activities. [19]

Adjuvants and toll-like receptors

The ability of immune system to recognize molecules that are broadly shared by pathogens is, in part, due to the presence of special Immune receptors called TLRs that are expressed on leukocyte membranes. In Chemistry, a molecule is defined as a sufficiently stable electrically neutral group of at least two Atoms in a definite arrangement held together by A pathogen (from Greek πάθος pathos "suffering passion" and γἰγνομαι (γεν- gignomai (gen- "I give birth to" infectious An immune receptor (or immunologic receptor) is a receptor, usually on a Cell membrane, which binds to a substance (for example a Cytokine) Toll-like receptors ( TLRs) are a class of single membrane-spanning non-catalytic receptors that recognize structurally conserved molecules derived from Microbes The cell membrane (also called the plasma membrane, plasmalemma, or "phospholipid bilayer" is a Selectively permeable Lipid bilayer TLRs were first discovered in drosophila, and are membrane bound pattern recognition receptors (PRRs) responsible for detecting most (although certainly not all) antigen-mediated infections. Drosophila is a Genus of small flies, belonging to the family Drosophilidae, whose members are often called "fruit flies" Pattern recognition receptors, or PRR s are Proteins expressed by cells of the Immune system to identify molecules associated with microbial Pathogens [20][21] In fact, some studies have shown that in the absence of TLR, leukocytes become unresponsive (no inflammatory responses) to some microbial components such as LPS. A microorganism (also spelled micro organism or micro-organism and also called a microbe) is an Organism that is Microscopic (usually [22] There are at least thirteen different forms of TLR, each with its own characteristic ligand. In Chemistry, a ligand is either an Atom, Ion, or Molecule (see also Functional group) that bonds to a central metal generally Prevailing TLR ligands described to date (all of which elicit adjuvant effects) include many evolutionarily conserved molecules such as LPS, lipoproteins, lipopeptides, flagellin, double-stranded RNA, unmethylated CpG islands and various other forms of DNA and RNA classically released by bacteria and viruses. In Chemistry, a ligand is either an Atom, Ion, or Molecule (see also Functional group) that bonds to a central metal generally eVolution is the third Album by eLDee, it was due to be released in 2008 In Chemistry, a molecule is defined as a sufficiently stable electrically neutral group of at least two Atoms in a definite arrangement held together by A lipoprotein is a biochemical assembly that contains both Proteins and Lipids The lipids or their derivatives may be covalently or non-covalently bound A lipopeptide is a Molecule consisting of a Lipid connected to a Peptide. Flagellin is a Protein that arranges itself in a hollow cylinder to form the filament in Bacterial Flagellum. Deoxyribonucleic acid ( DNA) is a Nucleic acid that contains the genetic instructions used in the development and functioning of all known Ribonucleic acid ( RNA) is a Nucleic acid that consists of a long chain of Nucleotide units The Bacteria ( singular: bacterium) are a large group of unicellular Microorganisms Typically a few Micrometres in length bacteria have A virus (from the Latin virus meaning Toxin or Poison) is a sub-microscopic infectious agent that is unable [23][24][25][26][27][28]

The binding of ligand - either in the form of adjuvant used in vaccinations or in the form of invasive moieties during times of natural infection - to the TLR marks the key molecular events that ultimately lead to innate immune responses and the development of antigen-specific acquired immunity. In Chemistry, a ligand is either an Atom, Ion, or Molecule (see also Functional group) that bonds to a central metal generally Vaccination is the administration of Antigenic material (the Vaccine) to produce immunity to a disease In Chemistry, a molecule is defined as a sufficiently stable electrically neutral group of at least two Atoms in a definite arrangement held together by [29][30]The very fact that TLR activation leads to adaptive immune responses to foreign entities explains why so many adjuvants used today in vaccinations are developed to mimic TLR ligands.

It is believed that upon activation, TLRs recruit adapter proteins (proteins that mediate other protein-protein interactions) within the cytosol of the immune cell in order to propagate the antigen-induced signal transduction pathway. An adaptor protein is a Protein which is accessory to main proteins in a Signal transduction pathway The cytosol or intracellular fluid (or cytoplasmic matrix) is the liquid found inside cells. In Biology, signal transduction refers to any process by which a cell converts one kind of signal or stimulus into another To date, four adapter proteins have been well-characterized. These proteins are known as MyD88, Trif, Tram and Tirap (also called Mal). Myeloid differentiation primary response gene (88 (MYD88 is a universal Adapter protein as it is used by all TLRs (except TLR 3) to activate Transcription TIR-domain-containing adapter-inducing interferon-β ( TRIF) is is an adapter in responding to activation of Toll-like receptors (TLRs A tram, tramcar, trolley, trolley car, or streetcar is a railborne vehicle, of lighter weight and construction than a Train Tirap can refer to Tirap district, a district in Arunachal Pradesh bordering Myanmar, Nagaland and Assam [31][32][33][34]These recruited proteins are then responsible for the subsequent activation of other downstream proteins, including protein kinases (IKKi, IRAK1, IRAK4, and TBK1) that further amplify the signal and ultimately lead to the upregulation or suppression of genes that orchestrate inflammatory responses and other transcriptional events. Proteins are large Organic compounds made of Amino acids arranged in a linear chain and joined together by Peptide bonds between the Carboxyl The downstream part of a bioprocess refers to the part where the cell mass from the upstream are processed to meet purity and quality requirements A protein kinase is a Kinase Enzyme that modifies other Proteins by chemically adding Phosphate groups to them ( Phosphorylation) Interleukin-1 receptor-associated kinase 1, also known as IRAK1, is a human Gene. IRAK-4 (interleukin-1 receptor-associated kinase 4 in the IRAK family is a Protein kinase involved in signaling innate immune responses from Toll-like receptors TANK-binding kinase 1, also known as TBK1, is a human Gene. History See also History of genetics The existence of genes was first suggested by Gregor Mendel (1822-1884 who in the 1860s studied inheritance Inflammation ( Latin, inflamatio, to set on fire is the complex biological response of vascular tissues to harmful stimuli such as Pathogens Transcription is the synthesis of RNA under the direction of DNA Some of these events lead to cytokine production, proliferation, and survival, while others lead to greater adaptive immunity. Cytokines are a category of signalling Proteins and Glycoproteins that like Hormones and Neurotransmitters, are used extensively in cellular The term cell growth is used in two different ways in Biology. [30] The high sensitivity of TLR for microbial ligands is what makes adjuvants that mimic TLR ligands such a prime candidate for enhancing the overall effects of antigen specific vaccinations on immunological memory. A microorganism (also spelled micro organism or micro-organism and also called a microbe) is an Organism that is Microscopic (usually Immunology is a broad branch of biomedical Science that covers the study of all aspects of the Immune system in all Organisms It deals with

Finally, the expression of TLRs is vast as they are found on the cell membranes of innate immune cells (DCs, macrophages, natural killer cells), cells of the adaptive immunity (T and B lymphocytes) and non immune cells (epithelial and endothelial cells, fibroblasts). The cell membrane (also called the plasma membrane, plasmalemma, or "phospholipid bilayer" is a Selectively permeable Lipid bilayer Macrophages ( Greek: "big eaters" from makros "large" + phagein "eat" ( Mø) are cells within the tissues that Natural killer cells (or NK cells) are a type of Cytotoxic Lymphocyte that constitute a major component of the Innate immune system. In biology and medicine epithelium is a tissue composed of cells that line the cavities and surfaces of structures throughout the body The endothelium is the thin layer of cells that line the interior surface of Blood vessels forming an interface between circulating Blood in the A fibroblast is a type of cell that synthesizes and maintains the Extracellular matrix of many Animal tissues [35]

This further substantiates the importance of administering vaccines with adjuvants in the form of TLR ligands as they will be capable of eliciting their positive effects across the entire spectrum of innate and adaptive immunity. A vaccine is a biological preparation which is used to establish or improve immunity to a particular disease Nevertheless, there are certainly adjuvants whose immune-stimulatory function completely bypasses the putative requisite for TLR signaling. In short, all TLR ligands are adjuvants but not all adjuvants are TLR ligands.

Medical complications

Aluminum salts used in many human vaccines are generally regarded as safe;[36] however, a recent study revealed that aluminum adjuvants at levels comparable to those administered to Gulf War veterans can cause motor neuron death. [37]

In veterinary medicine, particularly in felines, adjuvants have been linked to the induction of sarcomas at the injection site in a small proportion of vaccinations. [38]

Controversy

Recently, the premise that TLR signaling acts as the key node in antigen-mediated inflammatory responses has been in question as researchers have observed antigen-mediated inflammatory responses in leukocytes in the absence of TLR signaling. Inflammation ( Latin, inflamatio, to set on fire is the complex biological response of vascular tissues to harmful stimuli such as Pathogens Research is defined as Human activity based on Intellectual application in the investigation of Matter. [5][39] One researcher found that in the absence of MyD88 and Trif (essential adapter proteins in TLR signaling), they were still able to induce inflammatory responses, increase T cell activation and generate greater B cell abundancy using conventional adjuvants (alum, Freund’s complete adjuvant, Freund’s incomplete adjuvant, and monophosphoryl-lipid A/trehalose dicorynomycolate (Ribi's adjuvant). Usually a researcher or scientific researcher is someone who is professionally engaged in Scientific research, technological research or Engineering research Myeloid differentiation primary response gene (88 (MYD88 is a universal Adapter protein as it is used by all TLRs (except TLR 3) to activate Transcription TIR-domain-containing adapter-inducing interferon-β ( TRIF) is is an adapter in responding to activation of Toll-like receptors (TLRs An adapter or adaptor (both spellings in use in UK and US English[http//www B cells are Lymphocytes that play a large role in the humoral immune response (as opposed to the cell-mediated immune response, which is governed by For the purely-slang term alum meaning "graduate" see Alumnus. Freund's adjuvant is an Antigen Solution emulsified in Mineral oil, used as an Immunopotentiator (booster of the Immune system Freund's adjuvant is an Antigen Solution emulsified in Mineral oil, used as an Immunopotentiator (booster of the Immune system Polyclonal antibodies (or antisera are antibodies that are derived from different B cell lines [5]

These observations suggest that although TLR activation can lead to increases in antibody responses, TLR activation is not required to induce enhanced innate and adaptive responses to antigens.

Investigating the mechanisms which underlie TLR signaling has been significant in understanding why adjuvants used during vaccinations are so important in augmenting adaptive immune responses to specific antigens. Biomedical research (or experimental medicine) in general simply known as medical research, is the Basic research or Applied research conducted Mechanism The view that physical and chemical laws govern all natural phenomena including the processes of life An antigen (from antibody-generating) or immunogen is a substance that prompts the generation of Antibodies and can cause an immune response However, with the knowledge that TLR activation is not required for the immune-enhancing effects caused by common adjuvants, we can conclude that there are, in all likelihood, other receptors besides TLRs that have not yet characterized, opening the door to future research. Research is defined as Human activity based on Intellectual application in the investigation of Matter. Perhaps future adjuvants occupying these putative receptors will be employed to bypass the TLR signaling pathway completely in order to circumvent common side effects of adjuvant-activated TLRs such as local inflammation and the general malaise felt because of the costly whole-body immune response to antigen. The future is commonly understood to contain all events that have yet to occur In Biology, signal transduction refers to any process by which a cell converts one kind of signal or stimulus into another Side Effect were an influential Disco band that recorded between 1972 and 1995 Inflammation ( Latin, inflamatio, to set on fire is the complex biological response of vascular tissues to harmful stimuli such as Pathogens Malaise is a feeling of general discomfort or uneasiness an "out of sorts" feeling often the first indication of an infection or other disease Surely, such issues will be the subject of much debate for future researchers. Debate ( American English) or debating ( British English) is a formal method of interactive and position representational Argument. Research is defined as Human activity based on Intellectual application in the investigation of Matter.

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