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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

693
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...
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Diversity of Antigen Receptors01:28

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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...
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Characterization of a novel chicken γδ TCR-specific marker.

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New research introduces the 8D2 monoclonal antibody, a vital tool for identifying specific Vγ3 bearing gamma delta T cells in chickens. This discovery aids in understanding these abundant immune cells, previously difficult to study due to limited reagents.

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Area of Science:

  • Immunology
  • Cell Biology
  • Veterinary Science

Background:

  • Chickens possess a significant population of gamma delta (γδ) T cells in various tissues.
  • Characterization of chicken γδ T cells is limited by a scarcity of specific reagents, with TCR1 being the only existing γδ T cell-specific monoclonal antibody (mAb).
  • There is a need for additional reagents to identify and study γδ T cell subsets in chickens.

Purpose of the Study:

  • To generate and characterize new monoclonal antibodies (mAbs) for identifying chicken γδ T cell subsets.
  • To investigate the specificity of the newly generated mAb, clone 8D2, for particular γδ T cell populations.
  • To provide a novel tool for the detailed study of γδ T cells in chickens.

Main Methods:

  • Generation of new mAbs by immunizing mice with in vitro cultured chicken γδ T cells.
  • Flow cytometric screening of generated mAbs, focusing on clone 8D2 for its distinct staining pattern.
  • Comparative analysis of 8D2 and TCR1 staining on primary cells (splenocytes, peripheral blood lymphocytes, intestinal epithelial cells).
  • TCR V(D)J gene usage analysis of sorted γδ T cell populations (8D2+ and TCR1+ 8D2-) using TCR profiling.
  • Confirmation of 8D2 binding specificity by expressing specific γδ TCRs (Vγ3, Vγ1, Vγ2) in HEK293 cells.

Main Results:

  • The novel mAb, clone 8D2, was identified and characterized.
  • 8D2 consistently labeled a subset of TCR1+ cells in chicken splenocytes, peripheral blood lymphocytes, and intestinal epithelial cells.
  • TCR profiling revealed that 8D2+ γδ T cells preferentially expressed Vγ3 genes, specifically utilizing TRGV3-8 and TRGJ3 gamma chain genes, and TRDV1-2, TRDD2, TRDJ1 delta chain genes.
  • HEK293 cells expressing the identified Vγ3 γδ TCR bound to the 8D2 mAb, while cells expressing Vγ1 or Vγ2 TCR did not.

Conclusions:

  • The monoclonal antibody 8D2 is a novel and specific reagent for identifying chicken γδ T cells expressing Vγ3 T cell receptors.
  • This new tool significantly advances the ability to study specific γδ T cell subsets in chickens, addressing a critical gap in immunological research.
  • The findings enable more precise investigations into the function and distribution of Vγ3 γδ T cells in avian immunology.