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Related Concept Videos

Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

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.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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...
T Cell Types and Functions01:24

T Cell Types and Functions

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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Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...

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Updated: Jul 9, 2026

T Cells Capture Bacteria by Transinfection from Dendritic Cells
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Published on: January 13, 2016

CD1-restricted T-cell responses and microbial infection.

S H Park1, A Bendelac

  • 1Department of Molecular Biology, Princeton University, New Jersey 08544, USA.

Nature
|August 30, 2000
PubMed
Summary

CD1 glycoproteins capture lipid antigens for T cell presentation, a novel immune strategy distinct from classical MHC-peptide interactions. This discovery offers potential for developing new lipid-based vaccines and adjuvants.

Area of Science:

  • Immunology
  • Molecular Biology
  • Vaccine Development

Background:

  • Major histocompatibility (MHC)-like glycoproteins, including CD1, are crucial for immune responses.
  • Classical MHC molecules present peptide antigens to T lymphocytes.
  • The antigen-binding and presentation mechanisms of CD1 remain an area of active research.

Purpose of the Study:

  • To elucidate the distinct mechanisms by which CD1 glycoproteins present lipid antigens.
  • To compare CD1-lipid antigen presentation with classical MHC-peptide presentation pathways.
  • To explore the potential applications of CD1-mediated immunity in vaccine design.

Main Methods:

  • Analysis of CD1 glycoprotein structure and function.
  • Investigation of lipid antigen binding and T cell receptor interactions.

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  • Comparative studies with classical MHC-peptide presentation systems.

    • Main Results:

    • CD1 glycoproteins specialize in capturing and presenting lipid antigens, not peptides.
    • The mechanisms of CD1-lipid antigen presentation differ significantly from MHC-peptide pathways.
    • This unique immune strategy has been identified in mammals.

    Conclusions:

    • CD1 represents a distinct antigen presentation pathway utilizing lipid antigens.
    • Understanding CD1 function provides new insights into immune surveillance.
    • CD1-based strategies may lead to innovative lipid-based vaccines and adjuvants.