Adaptive Immune Response

Descrição

Immunopathology FlashCards sobre Adaptive Immune Response, criado por lumen7 em 30-04-2013.
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FlashCards por lumen7, atualizado more than 1 year ago
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Criado por lumen7 mais de 11 anos atrás
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Resumo de Recurso

Questão Responda
what is the role of dendritic cells in adaptive immunity? link innate to adaptive by presenting to T cells
perforin inducted apoptosis by CTLs 1. CTL meets virus infected cell. 2. the large cytolytic granules move toward point of membrane contact. 3. On fusion, granules release perforin, creating pores. 4. Proteases cleave cellular proteins and apoptosis begins
fas-mediated apoptosis by CTLs after initial encounter with virus infected cells, CTLs then upregulate FasL which gives an additional weapon
define primary response first encounter with antigen
define secondary response any subsequent encounter with antigen
key difference between IgM and IgG with regards to antigen affinity IgM- many units but weaker affinity. IgG 2 antigens but stronger affinity
where does antigen independent clonal selection occur? bone marrow by gene rearrangement
where does antigen dependent clonal selection occur? in the peripheral lymphoid tissue
naive B lymphocytes respond to first antigen challenge by synthesis of low affinity IgM antibodies
shortly after antigen exposure and production of IgM, B cells then produce IgM + IgD
B cells expressing IgM and IgD are then able to be stimulated by helper T cells and undergo class switching
what determines which class the B cell will switch to? cytokines produced by the helper T cells
affinity maturation 1. occurs after class switch. 2. somatic mutations in V regions create variations. 3. better matches differentiate into plasma cells
how do B cells respond to a repeated challenge? fast production of IgG antibodies
cytotoxic T cells (CTLs) 1. express CD8 which binds to MHC-1. 2. generated with help of Th1 cells.
CTLs are able to induce programmed cell death (apoptosis) of virus infected cells - 2 pathways 1. perforin induced apoptosis. 2. Fas mediated apoptosis
primary antibody responses Naïve B cells, Lag phase, IgM->IgG , Low levels of IgG, Low affinity Ab
secondary antibody responses Memory B cells, No lag phase, IggG, High levels of IgG, High affinity Ab
Secreted specific antibodies can: a) neutralise the antigen by preventing adherance b) opsonise the bacteria -promoting phagocytosis C) activate complement
Secretory IgA Two IgA molecules: are linked by a J (joining) chain; have a SC (secretory component) attached
Naïve B lymphocytes respond to the first challenge with the antigen by: by a synthesis of low affinity IgM antibodies after a log phase. This is followed by affinity maturation and class switch to IgG antibodies
Affinity maturation is provided by: somatic hypermutation in immunoglobulin genes
B lymphocytes respond to the repeated challenge with the same antigen by: a fast production of high affinity IgG antibodies
T cell cytotoxicity is mediated by: Fas/FasL pathway and perforin/granzyme release
APC and CD4+ T helper cells provide assistance for: both effector adaptive responses: antibody production and target cell killing.
T cell maturation is regulated by B cells

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