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Cell-mediated Immune Responses01:40

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The Extrinsic Apoptotic Pathway01:17

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The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
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The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
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Antigens Involved in Adaptive Immunity01:26

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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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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.
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Related Experiment Video

Updated: May 7, 2026

Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses
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CD95's deadly mission in the immune system.

P H Krammer1

  • 1Tumorimmunology Program, German Cancer Research Center, Heidelberg, Germany.

Nature
|October 26, 2000
PubMed
Summary

Apoptosis, or programmed cell death, is vital for immune system function, regulating lymphocyte development and responses. Understanding CD95 signaling pathways offers insights into diseases like cancer and AIDS.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Apoptosis is crucial for immune system regulation, including lymphocyte maturation and homeostasis.
  • Programmed cell death is as essential for lymphocyte function as growth and differentiation.

Purpose of the Study:

  • To focus on death receptor-associated apoptosis.
  • To elucidate the role of CD95 (Apo-1/Fas)-mediated signaling in lymphocyte development and immune responses.

Main Methods:

  • Review of existing literature on apoptosis and CD95 signaling.
  • Analysis of the implications of CD95-mediated pathways in T-cell and B-cell biology.

Main Results:

  • CD95-mediated signaling plays a critical role in T-cell and B-cell development.

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  • Understanding these apoptotic pathways is key to immune homeostasis and response regulation.

    • Conclusions:

    • Insights into CD95-associated apoptosis improve understanding of diseases like cancer, autoimmunity, and AIDS.
    • Targeting apoptotic pathways presents new rational treatment strategies for immune-related diseases.