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Related Concept Videos

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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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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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.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Overview
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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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Antigen Presenting Cells01:22

Antigen Presenting Cells

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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
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Related Experiment Video

Updated: Jul 2, 2025

Mouse Na&#239;ve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
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Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets

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Nutrients: Signal 4 in T cell immunity.

Jana L Raynor1, Hongbo Chi1

  • 1Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA.

The Journal of Experimental Medicine
|February 27, 2024
PubMed
Summary

Nutrients act as a fourth signal, crucial for T cell activation and adaptive immunity. Understanding this "Signal 4" can lead to new therapies for infections, autoimmunity, and cancer.

Area of Science:

  • Immunology
  • Cell Biology
  • Metabolism

Background:

  • T cells are key players in adaptive immunity, responding to infection, autoimmunity, and cancer.
  • T cell activation involves antigen (Signal 1), costimulation (Signal 2), and cytokines (Signal 3).
  • Emerging evidence shows nutrients are critical regulators of T cell function.

Purpose of the Study:

  • To summarize the functional importance of nutrient signaling (Signal 4) in T cell responses.
  • To elucidate the mechanisms of nutrient transport, sensing, and signaling in T cells.
  • To discuss the therapeutic potential of targeting nutrient pathways in immune diseases.

Main Methods:

  • Review of existing literature on nutrient signaling in T cells.
  • Analysis of nutrient transport, sensing, and signaling pathways.

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Real-time Live Imaging of T-cell Signaling Complex Formation
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  • Exploration of nutrient roles in T cell differentiation and fitness.

    • Main Results:

    • Nutrients act as a crucial fourth signal, influencing T cell activation and quiescence exit.
    • Mechanisms of nutrient uptake and signaling pathways are integral to T cell responses.
    • Nutrient availability profoundly impacts T cell differentiation and functional capabilities.

    Conclusions:

    • Nutrient signaling (Signal 4) is essential for T cell-mediated immunity.
    • Targeting nutrient pathways offers promising therapeutic strategies for immune-related diseases.
    • Understanding nutrient-T cell interactions in microenvironments is key for context-dependent immunity and treatment.