Tcr Activation
Tcr Activation - Related Videos
19:05
Measuring TCR-pMHC Binding In Situ using a FRET-based Microscopy Assay
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Cited by 9 •
2015
This manuscript describes how to conduct (single molecule) Förster Resonance Energy Transfer (FRET)- based assays to measure the binding dynamics between T-cell antigen receptor (TCR) and antigenic peptide-loaded MHC molecules as they occur within the immunological synapse of a T-cell in contact with a functionalized planar supported lipid bilayer.
16:10
A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins
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Cited by 13 •
2012
The compartmentalization of proteins either within the plasma membrane or into intracellular locations is one regulatory mechanism that can greatly influence signaling outcomes; hence, to understand signaling it is important to study the spatial and temporal behavior of the proteins involved. We describe here a TIRF microscopy based system to study signal transduction in T cells, but is broadly applicable.
06:42
Identifying Kinase Inhibitors that Modulate the Thymocyte Response to Strong TCR Signals
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2025
In this video, we describe a method to identify the small-molecule kinase inhibitors that modulate the apoptosis of self-reactive CD4+CD8+ double-positive immature thymocytes. Apoptosis is induced in the double-positive thymocytes by activating them with anti-CD3- and anti-CD28-coated magnetic beads; this is followed by a small-molecule inhibitor treatment and flow cytometry analysis to detect if the inhibitors modulate the apoptotic marker expression.
11:21
Streamlined Single Cell TCR Isolation and Generation of Retroviral Vectors for In Vitro and In Vivo Expression of Human TCRs
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Cited by 3 •
2017
The current protocol combines single cell paired human TCR alpha and beta chain sequencing with streamlined generation of retroviral vectors compatible with in vitro and in vivo TCR expression.
18:48
In Vitro and In Vivo Assessment of T, B and Myeloid Cells Suppressive Activity and Humoral Responses from Transplant Recipients
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Cited by 1 •
2017
Here, we present a protocol to induce tolerance in transplantation, and assess in vitro and in vivo the suppressive capacity of distinct cell subsets from the recipient and the immune status of the recipient toward donor or exogenous antigens.
FAQs
Once a TCR binds its peptide-MHC ligand, the signal is transmitted through associated CD3 proteins rather than remaining at the receptor surface. Immunoreceptor tyrosine-based activation motifs within CD3 become the signaling platform, allowing recruitment of the Lck and ZAP-70 kinases. This molecular relay converts antigen recognition into intracellular activation signals.
Lck and ZAP-70 act as recruited kinases in the early signaling relay. Their placement downstream of CD3-associated immunoreceptor tyrosine-based activation motifs links the receptor event to later activation of NFAT, NF-κB, and AP-1. This connection explains how a membrane-level recognition event can produce coordinated changes in T-cell function.
Costimulatory receptors strengthen the signal generated by peptide-MHC recognition, helping determine whether antigen recognition produces a substantial response. Their contribution is important because TCR engagement is linked to downstream cytokine production, proliferation, and differentiation through combined signaling. Studying this reinforcement helps explain how immune responses are regulated rather than triggered by recognition alone.
NFAT, NF-κB, and AP-1 provide a central transcriptional link between proximal TCR signaling and cellular behavior. Once activated by the pathway, these transcription factors drive gene-expression programs associated with cytokine production, proliferation, and differentiation. Examining this stage connects early kinase recruitment to the functional changes that define an adaptive immune response.
A conceptual study can follow TCR activation in sequence: provide antigen as peptide presented by major histocompatibility complex molecules, examine CD3-associated signaling and kinase recruitment, then assess transcription-factor activation. The analysis can continue to downstream cytokine production, proliferation, and differentiation. This organization connects an initiating recognition event with cellular consequences.
Researchers can evaluate the pathway through its downstream outcomes rather than through receptor binding alone. Cytokine production reflects one functional consequence, while proliferation and differentiation indicate broader changes in T-cell state. Tracking these outcomes helps relate signaling activity to adaptive immune performance and provides a framework for comparing responses in immunology and infection studies.
TCR activation is relevant across pathogen immunity, vaccine research, autoimmune disease, transplantation, and T-cell-based cancer therapies. In infection and vaccine studies, it provides a framework for examining how antigen recognition supports protective responses. In disease and therapeutic research, the same pathway helps investigate immune regulation and responses involving altered or deliberately harnessed T-cell activity.