Knowledge Tree
antigen
Also known as: antigens
Facts (59)
Sources
The components of the immune system - Immunobiology - NCBI - NIH ncbi.nlm.nih.gov 33 facts
referencePeripheral lymphoid tissues provide sustaining signals to lymphocytes that do not encounter their specific antigen, ensuring their survival and continued recirculation.
claimDendritic cells are specialized to take up antigens and display them for recognition by lymphocytes.
claimGerminal centers in B-cell follicles are sites where B cells undergo intense proliferation after encountering specific antigens and cooperating T cells.
claimM cells (multi-fenestrated cells) are specialized epithelial cells in Peyer's patches that collect antigen.
claimAfferent lymphatic vessels transport fluid, antigen-bearing cells, and antigens from infected tissues to the lymph nodes.
referenceGerminal centers within B-cell follicles are sites where B cells undergo intense proliferation after encountering their specific antigen and cooperating T cells.
claimAntigen is carried from sites of infection to peripheral lymphoid organs primarily within macrophages and dendritic cells.
referenceAfferent lymphatic vessels drain fluid from tissues and carry antigen-bearing cells and antigens from infected tissues to the lymph nodes, where they are trapped.
claimNaive lymphocytes are small B and T lymphocytes that have matured in the bone marrow and thymus but have not yet encountered an antigen.
claimLymphocytes can mount a specific immune response against virtually any foreign antigen because each lymphocyte matures with a unique variant of a prototype antigen receptor.
claimWithin lymphoid organs, specialized cells such as mature dendritic cells display antigen to lymphocytes.
claimPeripheral lymphoid organs, which include the lymph nodes, the spleen, and the mucosal lymphoid tissues, are specialized to trap antigen, initiate adaptive immune responses, and provide signals that sustain recirculating lymphocytes.
referenceGut-associated lymphoid tissues (GALT) include the tonsils, adenoids, appendix, and Peyer's patches in the small intestine, and they collect antigen from the epithelial surfaces of the gastrointestinal tract.
claimGut-associated lymphoid tissues (GALT) include the tonsils, adenoids, appendix, and Peyer's patches, which collect antigen from the epithelial surfaces of the gastrointestinal tract.
claimLymphocytes continually recirculate through peripheral lymphoid tissues, where they encounter antigens carried from infection sites primarily within macrophages and dendritic cells.
claimAdaptive immune responses are typically triggered when a recirculating T cell recognizes its specific antigen on the surface of a dendritic cell.
claimDendritic cells enter tissues as immature phagocytes to ingest antigens and subsequently migrate into lymphoid tissue as antigen-presenting cells.
claimLymphocytes can mount a specific immune response against virtually any foreign antigen because each individual lymphocyte matures with a unique variant of an antigen receptor, creating a diverse collective repertoire.
claimPeripheral lymphoid organs are specialized to trap antigen, allow the initiation of adaptive immune responses, and provide signals that sustain recirculating lymphocytes.
claimSmall lymphocytes have no functional activity until they encounter an antigen, which triggers their proliferation and differentiation.
claimAdaptive immune responses are initiated in peripheral lymphoid tissues, where T cells that encounter antigen proliferate and differentiate into antigen-specific effector cells, and B cells proliferate and differentiate into antibody-secreting cells.
claimIn peripheral lymphoid tissues, T cells that encounter antigen proliferate and differentiate into antigen-specific effector cells, while B cells proliferate and differentiate into antibody-secreting cells.
claimLymphocytes remain functionally inactive until they encounter an antigen, which triggers their proliferation and differentiation into specialized functional states.
referenceThe spleen is a fist-sized organ located behind the stomach that collects antigen from the blood and disposes of senescent red blood cells.
claimThe T-cell antigen receptor (TCR) is related to immunoglobulin but is distinct because it is adapted to detect antigens derived from foreign proteins or pathogens that have entered host cells.
claimThe T-cell antigen receptor (TCR) is structurally related to immunoglobulin but is distinct because it is adapted to detect antigens derived from foreign proteins or pathogens that have entered host cells.
procedureDuring a peripheral infection, dendritic cells take up large amounts of antigen and travel through afferent lymphatic vessels into draining lymph nodes to display the antigen to and activate recirculating T lymphocytes.
claimThe spleen is a fist-sized organ located behind the stomach that collects antigen from the blood and disposes of senescent red blood cells.
referenceB cells that encounter antigen while migrating through a lymph node are arrested and activated with the assistance of activated T cells.
claimThe peripheral lymphoid organs, which include the lymph nodes, the spleen, and the mucosal lymphoid tissues, are the sites where antigen and lymphocytes encounter each other.
claimDendritic cells are specialized to take up antigen and display it for recognition by lymphocytes.
referenceIn Peyer's patches, antigen is collected by specialized epithelial cells called multi-fenestrated or M cells.
referencePeripheral lymphoid tissues operate by trapping antigens from sites of infection and presenting them to migratory small lymphocytes to induce adaptive immune responses.
The immune system and primary immunodeficiency primaryimmune.org 7 facts
claimMature T cells leave the thymus as naïve T cells and populate organs such as the spleen, lymph nodes, bone marrow, and blood, where they may become memory T cells after antigen exposure.
claimAntibodies function by recognizing foreign antigens and physically attaching to them, which triggers a chain of events involving other immune system components to destroy the infection.
claimWhen B cells encounter foreign germs (antigens), they mature into plasma cells to produce antibodies or into memory cells to facilitate a rapid response to future infections.
claimEach T cell reacts with one specific antigen, and the body possesses a variety of T cells extensive enough to react against virtually any antigen.
claimEach T cell reacts with one specific antigen, and T cells possess surface molecules similar to antibodies to facilitate this recognition.
claimAntibodies are designed to recognize specific foreign antigens like a lock and key, with specific antibody molecules existing for pathogens such as poliovirus, diphtheria bacteria, the common cold virus, and the measles virus.
claimThe human body contains a vast variety of T cells capable of reacting against virtually any antigen.
Parts of the Immune System | Children's Hospital of Philadelphia chop.edu 7 facts
claimWhen macrophages function as antigen-presenting cells, they typically present antigens from pathogens that have evolved to evade typical innate immune responses.
procedureDendritic cells migrate to the nearest lymph node to present antigens to help activate T cells.
claimA small subset of B and T cells, known as memory cells, remain indefinitely after an infection and recognize specific antigens.
claimMemory cells are a small subset of B and T cells that remain indefinitely after an infection and recognize specific antigens.
claimMemory cells recognize specific antigens and monitor the body for their return.
claimB cells are an essential part of the adaptive immune response and can serve as antigen-presenting cells (APCs) to activate responses against toxins or smaller antigens like proteins.
procedureDendritic cells are produced in bone marrow, migrate through the blood to tissues to monitor for pathogens, and upon encountering a pathogen, phagocytose it and present pieces of it as antigens on their surface.
Immunity In Depth | Linus Pauling Institute lpi.oregonstate.edu 4 facts
claimProtein-energy malnutrition (PEM) leads to atrophy of the thymus, which reduces the number of circulating T cells and decreases the effectiveness of the memory response to antigens.
claimThe lack of immunologic memory in the innate immune system means that the same response is mounted regardless of how often a specific antigen is encountered.
claimVitamin A is required for the proper function of T and B lymphocytes, which mediate adaptive immunity, and is necessary for generating antibody responses to specific antigens.
claimExposure to a specific antigen on an invading pathogen stimulates the production of immune cells that target that pathogen for destruction.
How the Immune System Works with Primary Immunodeficiency igcares.com 3 facts
claimWhen B-cells encounter foreign material (antigens), they respond by maturing into plasma cells or memory cells, the latter of which allow a rapid response if the same infection is encountered again.
claimDendritic cells are important for presenting antigens to immune system cells.
claimImmunoglobulins, also known as antibodies, are highly specialized protein molecules that fit foreign antigens like a lock and key.
3. The Innate Immune System - Immunopaedia immunopaedia.org.za 3 facts
claimB-1 cells are a phenotypically and functionally distinct subset of B cells that spontaneously secrete natural IgM antibodies without stimulation by specific antigens.
claimMarginal zone B (MZ B) cells are easily activated by low levels of antigen, act as potent antigen-presenting cells for naive T cells, and produce short-lived IgM antibody-forming cells involved in early defense against blood-borne pathogens and autoreactive B cell responses.
claimDuring emigration to secondary lymphoid organs, dendritic cells process captured molecules into small peptides, link them to MHC-II molecules, express them on the cell surface, and present antigens to naive and memory T cells.
The Role of Immune Cells in Inflammation jmolpat.com 1 fact
claimT cells play a critical role in adaptive immunity by recognizing specific antigens and activating immune responses to clear infections.
Chronic Inflammation - StatPearls - NCBI Bookshelf ncbi.nlm.nih.gov 1 fact
claimAutoimmune disorders cause chronic inflammation when the immune system recognizes normal body components as foreign antigens and attacks healthy tissue, leading to diseases such as rheumatoid arthritis and systemic lupus erythematosus.