Lecture

Activation of T Cells by APCs

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In course

BIO-310: Immunology

Ce cours décrit le fonctionnement du système immunitaire humain et les bases immunologiques de la vaccination, de la transplantation, de l'immunothérapie, et de l'allergie. Il présente aussi le rôle des cellules souches dans la formation des tissus, notamm ...

Description

This lecture covers the activation of T cells by antigen-presenting cells (APCs), focusing on the role of co-stimulation and adherence in the process. It explains the model of the two signals required for T cell activation, the immunological synapse, and the interaction between T cells and APCs. Specific properties of T cell activation by superantigens are discussed, along with the role of co-stimulatory molecules and cell adhesion in stimulating T cell responses.

In MOOC

Introduction to immunology (part 1)

Instructors (2)

David Michael Suter

Teaching & PhD PhD Students Ekaterina Lyublinskaya, Yuliia Romaniuk, Joanna Agnieszka Dembska, Solomon Nshemereirwe Past EPFL PhD Students Onur Tidin, Aleksandra Mandic, Daniel Strebinger, Andrea Brigitta Alber, Mahé Raccaud, Torgil Elias Friman, Shoujie Sun, Silja Michelle Placzek, Romane Mizeret, Benjamin Martin, Sim Sakong, Stella Katharina Krämer Past EPFL PhD Students as codirector Damien Lionel Nicolas, Isabelle Chareyron, Christopher Tadhg James Wall, Kolly Dominique Courses Immunology BI

Bruno Lemaitre

Personal Webpage http://brunolemaitre.ch Personal Webpage http://brunolemaitre.ch Teaching & PhD PhD Students Blandine Ribotta, Yao Tian, Désirée Popelka, Prince Kumar Sah, Siqi Wang, Kenan Krakovic, Nathan Alexandre Klotz Past EPFL PhD Students Sveta Chakrabarti, Olivier Binggeli, Jeremy Keith Herren, Juan Camilo Paredes Escobar, Alfred Chng, Maroun Bou Sleiman, Jan Paul Dudzic, Mario Gonzalo Garcia Arraez, Claudia Melcarne, Alice Marra, Bianca Marie Petrignani, Mark Austin Hanson, Alexia Laurie Carboni

Official source

Quiz

Ontological neighbourhood

Health sciences

Immunology: Immune system

Related concepts (29)

Antigen presentation

Antigen presentation is a vital immune process that is essential for T cell immune response triggering. Because T cells recognize only fragmented antigens displayed on cell surfaces, antigen processing must occur before the antigen fragment, now bound to the major histocompatibility complex (MHC), is transported to the surface of the cell, a process known as presentation, where it can be recognized by a T-cell receptor. If there has been an infection with viruses or bacteria, the cell will present an endogenous or exogenous peptide fragment derived from the antigen by MHC molecules.

Antigen

In immunology, an antigen (Ag) is a molecule, moiety, foreign particulate matter, or an allergen, such as pollen, that can bind to a specific antibody or T-cell receptor. The presence of antigens in the body may trigger an immune response. Antigens can be proteins, peptides (amino acid chains), polysaccharides (chains of simple sugars), lipids, or nucleic acids. Antigens exist on normal cells, cancer cells, parasites, viruses, fungi, and bacteria. Antigens are recognized by antigen receptors, including antibodies and T-cell receptors.

T helper cell

The T helper cells (Th cells), also known as CD4+ cells or CD4-positive cells, are a type of T cell that play an important role in the adaptive immune system. They aid the activity of other immune cells by releasing cytokines. They are considered essential in B cell antibody class switching, breaking cross-tolerance in dendritic cells, in the activation and growth of cytotoxic T cells, and in maximizing bactericidal activity of phagocytes such as macrophages and neutrophils.

Antigen processing

Antigen processing, or the cytosolic pathway, is an immunological process that prepares antigens for presentation to special cells of the immune system called T lymphocytes. It is considered to be a stage of antigen presentation pathways. This process involves two distinct pathways for processing of antigens from an organism's own (self) proteins or intracellular pathogens (e.g. viruses), or from phagocytosed pathogens (e.g. bacteria); subsequent presentation of these antigens on class I or class II major histocompatibility complex (MHC) molecules is dependent on which pathway is used.

Naive T cell

In immunology, a naive T cell (Th0 cell) is a T cell that has differentiated in the thymus, and successfully undergone the positive and negative processes of central selection in the thymus. Among these are the naive forms of helper T cells (CD4+) and cytotoxic T cells (CD8+). Any naive T cell is considered immature and, unlike activated or memory T cells, has not encountered its cognate antigen within the periphery. After this encounter, the naive T cell is considered a mature T cell.

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