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or the antigen can be seen as a string of keys epitopes each of which matches a different lock antibody different antibody idiotypes each have distinctly formed complementarity determining regions antibodies may compete for binding when they recognize overlapping epitopes paratope the specific part of the antibody that binds the antigen in general the complementarity determining region though sometimes framework regions may contribute agretope the specific peptide sequence recognized by a major histocompatibility complex mhc hapten a small molecule that can only induce an immune response when attached to a larger carrier molecule such as a protein the hapten alone will not be recognized if not associated with a carrier t dependent antigen antigens that require the assistance of t cells to induce the formation of specific antibodies t independent antigen antigens that can induce the production of antibodies without the help of t cells t independent type i antigen mitogens that induce nonspecific activation of b cells at smaller doses they initially appeared specific to particular b cells suggesting erroneously that this was an antigen specific process subsequent investigation proved their nonspecific nature t independent type ii antigen antigens containing multiple repetitive motifs that allow them to crosslink b cell receptors and directly activate the b cells bacterial capsule polysaccharides are a common example immunodominant antigens antigens that dominate over all others from a pathogen in their ability to produce an immune response t cell responses typically are directed against a relatively few immunodominant epitopes although in some cases e g infection with the malaria pathogen plasmodium spp it is dispersed over a relatively large number of parasite antigens 15 these are contrasted with immunosubdominant sometimes referred to just as subdominant antigens antigen presenting cells present antigens in the form of peptides on major histocompatibility complexes all nucleated cells i e all cells except for red blood cells express mhc class i which samples peptides from the cytosol defaulting to presenting self antigen unless something foreign ends up in the cytosol or if the cell is capable of cross presentation antigens originating from outside the cell make their way into the endomembrane system via processes like phagocytosis endocytosis or macropinocytosis and are loaded onto mhc class ii molecules in contrast to mhc class i mhc class ii is expressed on a limited subset of cells the vast majority of which are immune cells some epithelial cells at mucosal surfaces may also express mhc class ii often when people refer to antigen presenting cells they are actually referring to professional antigen presenting cells professional antigen presenting cells refer to b cells dendritic cells langerhans cells and macrophages all of which express mhc class ii and have the ability to activate naive t cells other antigen presenting cells cannot supply naive t cells with all the signals required for activation the mhc locus is the most polymorphic region of the entire human genome 16 and it is responsible for the presentation of antigens to t cells this extensive polymorphism provides population level protection by increasing the likelihood that some individuals will mount effective immune responses against novel pathogens thus helping to ensure species survival during epidemics cheetahs for example underwent a bottleneck event 10 000 years ago that greatly limited the diversity of their mhc locus and as a result show increased susceptibility to infectious diseases though this represents one of multiple factors affecting their conservation status 17 cd4 t cells in general helper t cells are able to recognize mhc class ii molecules using cd4 and their t cell receptor recognizes the specific peptide mhc complex sequence in contrast cd8 t cells in general killer t cells are able to recognize mhc class i molecules through the α 3 domain of mhc class i it does not recognize β2 microglobulin t cell receptors are in general highly specific to particular peptide mhc complexes some peptide sequences can only be presented by a specific type of mhc protein because they require specific amino acid sequences within the binding groove to associate with them these are known as mhc restricted peptides if an individual does not express the relevant mhc protein needed for a given mhc restricted peptide they will not be able to present that antigen to t cells this can be an important consideration in the design of vaccines as a robust immune response should be generated in every vaccinee which will not be possible if it has too many mhc restricted peptide sequences and the vaccinee does not express the correct mhc polymorphism for effective presentation to t cells because the t cell receptor cannot recognize anything not presented on an mhc conventional see next paragraph t cells are not capable of responding to non peptide antigens lipids carbohydrates etc except in the case of post translational modifications to peptides that end up being presented 18 this is important because polysaccharide vaccines elicit antibody responses without t cell help and as a result those antibody responses tend to be weak and short lived and young children have a particularly difficult time generating these antibodies for developmental reasons which is a major issue because the polysaccharides in question are present on the surfaces of pathogenic bacteria however attaching the polysaccharide to a carrier protein especially an immunogenic one such as tetanus toxoid enables b cells that recognize the polysaccharide to get help from t cells that recognize the carrier protein s peptides 19 these are known as conjugate vaccines or glycoconjugates 20 moreover the processing of an antigen by an antigen presenting cell causes loss of the tertiary structure of the protein meaning that t cells recognize linear epitopes only the amino acids recognized have to be next to each other in the primary structure there are also subsets of t cells known as unconventional t cells that may recognize non peptide antigens or peptides many of these subsets show predominantly innate rather than adaptive functions for example γδ t cells express a t cell receptor comprising γ and δ chains instead of the α and β chains that conventional t cell receptors use and they are able to recognize antigen without the need for presenting it on mhc proteins though some have shown the ability to recognize mhc presented antigens instead having a mode of recognition that resembles that of antibodies or recognizing phosphoantigens antigens that are phosphorylated through butyrophilin 21 mucosa associated invariant t cells mait cells recognize ligands presented by the mhc related protein mr1 which presents metabolites of riboflavin pyridoxine and folates 22 nkt cells recognize glycolipid antigens presented on cd1d most prominently α galactosylceramide 23 in contrast to t cell receptors antibodies can recognize any type of molecule at virtually any size and can recognize either linear or conformational epitopes the amino acids that comprise an epitope do not need to be next to each other in the primary structure but do need to be near one another when the protein is folded at the molecular level an antigen can be characterized by its ability to bind to an antibody s paratopes different antibodies have the potential to discriminate among specific epitopes present on the antigen surface sources edit antigens can be classified according to their source exogenous antigens edit exogenous antigens are antigens that have entered the body from the outside for example by inhalation ingestion or injection the immune system s response to exogenous antigens is often subclinical by endocytosis or phagocytosis exogenous antigens are taken into the antigen presenting cells apcs and processed into fragments apcs then present the fragments to t helper cells cd4 by the use of class ii histocompatibility molecules on their surface some t cells are specific for the peptide mhc complex they become activated and start to secrete cytokines substances that activate cytotoxic t lymphocytes ctl antibody secreting b cells macrophages and other particles some antigens start out as exogenous and later become endogenous for example intracellular viruses intracellular antigens can be returned to circulation upon the destruction of the infected cell endogenous antigens edit endogenous antigens are generated within normal cells as a result of normal cell metabolism or because of viral or intracellular bacterial infection the fragments are then presented on the cell surface in the complex with mhc class i molecules if activated cytotoxic cd8 t cells recognize them the t cells secrete various toxins that cause the lysis or apoptosis of the infected cell in order to keep the cytotoxic cells from killing cells just for presenting self proteins the cytotoxic cells self reactive t cells are deleted as a result of tolerance negative selection endogenous antigens include xenogenic heterologous autologous and idiotypic or allogenic homologous antigens sometimes antigens are part of the host itself in an autoimmune disease 3 autoantigens edit this section does not cite any sources please help improve this section by adding citations to reliable sources unsourced material may be challenged and removed find sources antigen news newspapers books scholar jstor august 2026 learn how and when to remove this message an autoantigen or self antigen is usually a self protein or protein complex and sometimes dna or rna that is recognized by the immune system of patients with a specific autoimmune disease under normal conditions these self proteins should not be the target of the immune system but in autoimmune diseases their associated t cells are not deleted and instead attack neoantigens edit neoantigens are those that are entirely absent from the normal human genome as compared with nonmutated self proteins neoantigens are of relevance to tumor control as the quality of the t cell pool that is available for these antigens is not affected by central t cell tolerance technology to systematically analyze t cell reactivity against neoantigens became available only recently 24 neoantigens can be directly detected and quantified 25 viral antigens edit for virus associated tumors such as cervical cancer and a subset of head and neck cancers epitopes derived from viral open reading frames contribute to the pool of neoantigens 24 tumor antigens edit tumor antigens are those antigens that are presented by mhc class i or mhc class ii molecules on the surface of tumor cells antigens found only on such cells are called tumor specific antigens tsas and generally result from a tumor specific mutation more common are antigens that are presented by tumor cells and normal cells called tumor associated antigens taas cytotoxic t lymphocytes that recognize these antigens may be able to destroy tumor cells 24 tumor antigens can appear on the surface of the tumor in the form of for example a mutated receptor in which case they are recognized by b cells 24 for human tumors without a viral etiology novel peptides neo epitopes are created by tumor specific dna alterations 24 process edit a large fraction of human tumor mutations are effectively patient specific therefore neoantigens may also be based on individual tumor genomes deep sequencing technologies can identify mutations within the protein coding part of the genome the exome and predict potential neoantigens in mice models for all novel protein sequences potential mhc binding peptides were predicted the resulting set of potential neoantigens was used to assess t cell reactivity exome based analyses were exploited in a clinical setting to assess reactivity in patients treated by either tumor infiltrating lymphocyte til cell therapy or checkpoint blockade neoantigen identification was successful for multiple experimental model systems and human malignancies 24 the false negative rate of cancer exome sequencing is low i e the majority of neoantigens occur within exonic sequence with sufficient coverage however the vast majority of mutations within expressed genes do not produce neoantigens that are recognized by autologous t cells 24 as of 2015 mass spectrometry resolution is insufficient to exclude many false positives from the pool of peptides that may be presented by mhc molecules instead algorithms are used to identify the most likely candidates these algorithms consider factors such as the likelihood of proteasomal processing transport into the endoplasmic reticulum affinity for the relevant mhc class i alleles and gene expression or protein translation levels 24 the majority of human neoantigens identified in unbiased screens display a high predicted mhc binding affinity minor histocompatibility antigens a conceptually similar antigen class are also correctly identified by mhc binding algorithms another potential filter examines whether the mutation is expected to improve mhc binding the nature of the central t cell receptor exposed residues of mhc bound peptides is associated with peptide immunogenicity 24 nativity edit a native antigen is an antigen that is not yet processed by an apc to smaller parts t cells cannot bind native antigens but require that they be processed by apcs whereas b cells can be activated by native ones antigenic specificity edit antigenic specificity is the ability of the host cells to recognize an antigen specifically as a unique molecular entity and distinguish it from another with exquisite precision antigen specificity is due primarily to the side chain conformations of the antigen it is measurable and need not be linear or of a rate limited step or equation 3 8 both t cells and b cells are cellular components of adaptive immunity 3 5 see also edit antigenic escape antitoxin conformational epitope epitope linear epitope magnetic immunoassay neutralizing antibody original antigenic sin paul ehrlich magic bullet polyclonal b cell response priming immunology references edit lawrence eleanor ag henderson s dictionary of biological terms 10th ed p 1 isbn 0 470 21446 5 1 2 antibody national human genome research institute us national institutes of health 2020 retrieved 13 october 2020 1 2 3 4 5 immune system and disorders medlineplus us national institute of medicine 28 september 2020 retrieved 13 october 2020 1 2 3 4 antigen cleveland clinic 2023 retrieved 23 may 2023 1 2 3 4 abbas ak lichtman a pillai s 2018 antibodies and antigens cellular and molecular immunology 9th ed philadelphia elsevier isbn 9780323523240 oclc 1002110073 gallucci s lolkema m matzinger p november 1999 natural adjuvants endogenous activators of dendritic cells nature medicine 5 11 1249 1255 doi 10 1038 15200 pmid 10545990 s2cid 29090284 janeway jr ca travers p walport m shlomchik mj 2001 autoimmune responses are directe...