14.2: Specific Adaptive Host Defenses
- Page ID
- 42559
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)- 14.2.1: Architecture of the Immune System
- This page provides an overview of adaptive immunity, emphasizing key concepts like memory, specificity, and the roles of B and T lymphocytes. It explains the structure and function of antibodies, detailing the five classes (IgG, IgM, IgA, IgD, IgE) and their unique immunological roles.
- 14.2.2: Antigens, Antigen Presenting Cells, and Major Histocompatibility Complexes
- This page covers major histocompatibility complex (MHC) molecules, essential for immune responses. MHC I presents antigens on all nucleated cells to T cells, while MHC II is specific to antigen-presenting cells (APCs) like macrophages and dendritic cells, primarily activating T cells. The text details the structure and function of both MHC classes and highlights the process of cross-presentation, allowing dendritic cells to present antigens on MHC I, thus enhancing immune activation and response.
- 14.2.3: T Lymphocytes
- This page provides an overview of T-cell maturation, focusing on thymic selection processes that generate functional, non-self-reactive T cells. It details T-cell receptor (TCR) structure and genetic diversity in recognizing pathogens. The activation pathways for helper and cytotoxic T cells, their roles in the immune response, and the dangers of unregulated activation by superantigens, which can cause severe inflammatory responses like toxic shock syndrome, are also discussed.
- 14.2.4: B Lymphocytes and Antibodies
- This page outlines humoral immunity, emphasizing B cells that produce antibodies and their maturation process in the bone marrow. It differentiates between T-dependent and T-independent activation of B cells, leading to memory formation and antibody class switching. The primary antibody response features a lag phase before IgM production, followed by IgG class switching.
- 14.2.5: Vaccines
- This page explores artificial immunity and vaccination, covering types such as active and passive immunity, along with natural and artificial variants. It highlights vaccination's role in disease prevention and herd immunity and navigates ethical debates influenced by "antivaxxers." The history of vaccination is traced from Edward Jenner's smallpox vaccine to various modern types, including DNA vaccines, emphasizing their mechanisms and clinical applications.
Thumbnail: From left to right: erythrocyte ,platelet and lymphocyte. (Public Domain; The National Cancer Institute at Frederick ).