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Antigen Presenting Cells

Antigen Presenting Cells

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...

B Cell Activation and Differentiation

B Cell Activation and Differentiation

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...

T Cell Activation and Clonal Selection

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...

Antigens Involved in Adaptive Immunity

Antigens Involved in Adaptive Immunity

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.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.

Cells of the Adaptive Immune Response

Cells of the Adaptive Immune Response

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...

Cell-mediated Immune Responses

Cell-mediated Immune Responses

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Related Experiment Video

Updated: Jul 11, 2026

An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets

An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets

Published on: April 18, 2016

Dendritic cells bask in the limelight.

William E Paul¹

¹Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. wpaul@niaid.nih.gov

|September 25, 2007

Summary

Ralph Steinman won the 2007 Lasker Award for discovering dendritic cells. His research revealed their crucial role in activating immune T cell responses.

Area of Science:

Immunology
Cell Biology

Background:

Dendritic cells were discovered by Ralph Steinman.
Their function in the immune system was previously not well understood.

Discussion:

This award recognizes the fundamental discovery of dendritic cells.
Steinman's work elucidated their critical role in antigen presentation.
Dendritic cells are key activators of T cell-mediated immunity.

Key Insights:

Dendritic cells are the principal antigen-presenting cells.
These cells initiate adaptive immune responses.
They bridge innate and adaptive immunity.

Outlook:

Further research into dendritic cell function continues.

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Generation of Human Monocyte-derived Dendritic Cells from Whole Blood

Generation of Human Monocyte-derived Dendritic Cells from Whole Blood

Published on: December 24, 2016

Generation of Bone Marrow Derived Murine Dendritic Cells for Use in 2-photon Imaging

Generation of Bone Marrow Derived Murine Dendritic Cells for Use in 2-photon Imaging

Published on: July 9, 2008

Related Experiment Videos

Last Updated: Jul 11, 2026

An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets

An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets

Published on: April 18, 2016

Generation of Human Monocyte-derived Dendritic Cells from Whole Blood

Generation of Human Monocyte-derived Dendritic Cells from Whole Blood

Published on: December 24, 2016

Generation of Bone Marrow Derived Murine Dendritic Cells for Use in 2-photon Imaging

Generation of Bone Marrow Derived Murine Dendritic Cells for Use in 2-photon Imaging

Published on: July 9, 2008

Therapeutic strategies targeting dendritic cells are being developed.

This discovery has implications for vaccines and immunotherapy.