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Related Concept Videos

Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Immunological Memory01:23

Immunological Memory

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Overview
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T Cell Types and Functions01:24

T Cell Types and Functions

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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Detection of SARS-CoV-2 Neutralizing Antibodies using High-Throughput Fluorescent Imaging of Pseudovirus Infection
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SARS-CoV-2 T cell immunity: Specificity, function, durability, and role in protection.

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Understanding SARS-CoV-2 immunity requires analyzing both antibodies and T cells. T cell memory may offer more durable protection against COVID-19 than antibodies alone.

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Area of Science:

  • Immunology
  • Virology
  • Infectious Diseases

Background:

  • Antibody responses to SARS-CoV-2 appear to be short-lived.
  • T cell immunity, including CD4 and CD8 effector functions, may provide more durable protection against COVID-19.
  • Understanding population-level immunity to SARS-CoV-2 is crucial for public health strategies.

Purpose of the Study:

  • To synthesize a clear understanding of SARS-CoV-2 protective immunity.
  • To define the role of CD4 and CD8 T cells in protection against COVID-19.
  • To highlight the benefit of screening for both antibody and T cell immunity.

Main Methods:

  • Analysis of antibody responses in individuals with asymptomatic, mild, and severe COVID-19.
  • Parallel studies examining T cell responses (CD4 and CD8) in COVID-19 patients.
  • Utilizing standardized testing methods for immune screening.

Main Results:

  • Antibody responses to SARS-CoV-2 have been observed to be transient.
  • T cell memory is potentially more durable than antibody responses.
  • Immune responses vary across different COVID-19 severity levels.

Conclusions:

  • Defining CD4 and CD8 effector functions is important for understanding protective immunity.
  • Screening for both antibody and T cell immunity is beneficial for a comprehensive understanding of population-level immunity.
  • Standardized testing methods are recommended for accurate immune assessment.