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Related Concept Videos

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...
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Cells of the Adaptive Immune Response01:23

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...
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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Antigens Involved in Adaptive Immunity01:26

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.

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Related Experiment Video

Updated: Jun 17, 2026

Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation
15:33

Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation

Published on: August 13, 2013

RasGRP1 regulates antigen-induced developmental programming by naive CD8 T cells.

John J Priatel1, Xiaoxi Chen, Yu-Hsuan Huang

  • 1Child and Family Research Institute, Vancouver, British Columbia, Canada. jpriatel@interchange.ubc.ca

Journal of Immunology (Baltimore, Md. : 1950)
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

RasGRP1 is crucial for CD8 T cell activation and expansion by regulating IL-2 production. Its absence leads to T cell anergy, impacting immune responses.

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Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
07:12

Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets

Published on: April 16, 2015

Related Experiment Videos

Last Updated: Jun 17, 2026

Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation
15:33

Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation

Published on: August 13, 2013

Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
07:12

Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets

Published on: April 16, 2015

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Signaling

Background:

  • Naive CD8 T cell activation initiates a developmental program involving proliferation and differentiation into effector and memory cells.
  • TCR signaling strength and duration are key regulators of CD8 T cell differentiation, but underlying molecular mechanisms are not fully understood.
  • Ras-guanyl nucleotide exchange factor RasGRP1 is vital for TCR-mediated signals in thymocyte maturation.

Purpose of the Study:

  • To investigate the role of RasGRP1 in CD8 T cell differentiation.
  • To elucidate the molecular signals RasGRP1 transduces in response to T cell receptor (TCR) signaling.
  • To understand how RasGRP1 influences T cell activation thresholds and immune response initiation.

Main Methods:

  • In vitro and in vivo experiments using 2C TCR transgenic CD8 T cells lacking RasGRP1.
  • Analysis of T cell activation, proliferation, and differentiation.
  • Assessment of IL-2 production and T cell anergy.
  • Investigation of IL-2/IL-2R signaling pathways.

Main Results:

  • RasGRP1 deficiency in CD8 T cells lowers the threshold for T cell activation and antigen-induced expansion, partly via IL-2 regulation.
  • RasGRP1(-/-) CD8 T cells display an anergic phenotype upon stimulation, which can be partially reversed by exogenous IL-2.
  • IL-2/IL-2R-mediated Ras activation, CD8 T cell expansion, and differentiation are largely independent of RasGRP1.

Conclusions:

  • RasGRP1 plays a selective role in T cell signaling, controlling the initiation and duration of CD8 T cell immune responses.
  • RasGRP1 is critical for proper CD8 T cell activation and preventing anergy.
  • Understanding RasGRP1's function provides insights into regulating T cell-mediated immunity.