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Related Concept Videos

Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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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.
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Immune Response Against Viral Pathogens01:29

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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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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T Cell Types and Functions01:24

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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.
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Related Experiment Video

Updated: Oct 15, 2025

Detection of SARS-CoV-2 Neutralizing Antibodies using High-Throughput Fluorescent Imaging of Pseudovirus Infection
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T cell immunity to SARS-CoV-2.

Julia Niessl1, Takuya Sekine1, Marcus Buggert1

  • 1Department of Medicine Huddinge, Center for Infectious Medicine, Karolinska Institutet, Stockholm, Sweden.

Seminars in Immunology
|October 29, 2021
PubMed
Summary
This summary is machine-generated.

This review details T cell responses in COVID-19, exploring CD4+ and CD8+ T cell roles in infection and vaccination. Understanding T cells in tissues is crucial for complete immunity insights.

Keywords:
COVID-19Memory T cellsSARS-CoV-2Vaccine

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Area of Science:

  • Immunology
  • Virology
  • Infectious Diseases

Background:

  • Adaptive immunity, particularly T cells, is vital for controlling viral infections like SARS-CoV-2.
  • Specific T cell characteristics correlate with COVID-19 severity and vaccine effectiveness.
  • Existing research primarily focuses on blood-based T cell responses.

Purpose of the Study:

  • To review current knowledge on CD4+ and CD8+ T cell responses during acute and convalescent COVID-19.
  • To discuss the role of T cells in the context of pre-existing immunity and vaccination.
  • To emphasize the importance of studying T cell functions within tissue environments.

Main Methods:

  • Literature review of adaptive immune responses to SARS-CoV-2.
  • Analysis of studies on CD4+ and CD8+ T cell characteristics.
  • Synthesis of data linking T cell responses to COVID-19 severity and vaccine outcomes.

Main Results:

  • T cells play a critical role in protection, control, and clearance of SARS-CoV-2.
  • Specific T cell profiles are associated with varying COVID-19 severity.
  • Vaccine responses and pre-existing immunity influence T cell dynamics.

Conclusions:

  • Further research is needed to fully elucidate T cell functions in tissue spaces.
  • Understanding tissue-resident T cells is key to comprehensive COVID-19 immunity.
  • Integrating blood and tissue data will enhance our knowledge of adaptive immunity to SARS-CoV-2.