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Updated: Nov 23, 2025
Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers
Published on: March 6, 2009
The Many Faces of CD4+ T Cells: Immunological and Structural Characteristics
Demetra S M Chatzileontiadou1, Hannah Sloane1, Andrea T Nguyen1
1Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia.
Insights
CD4+ T cells, crucial for immunity, exhibit diverse lineages like Th1, Th2, Th17, Th22, Treg, and Tfh. Structural biology reveals mechanisms of CD4+ T cell pathogen recognition.
Area of Science:
- Immunology
- Cellular Biology
- Structural Biology
Background:
- CD4+ T cells are central to cellular immunity, controlling infections and aiding B and CD8+ T cell responses.
- These cells are highly heterogeneous, comprising distinct lineages such as T helper 1, 2, 17, and 22 (Th1, Th2, Th17, Th22), regulatory T cells (Treg), and T follicular helper cells (Tfh).
Purpose of the Study:
- To review the defining features of major human CD4+ T cell lineages.
- To discuss their roles in immunity and pathogen detection.
- To highlight structural biology insights into CD4+ T cell recognition.
Main Methods:
- Literature review focusing on recent advances in structural biology.
- Analysis of molecular mechanisms driving CD4+ T cell recognition.
- Characterization of CD4+ T cell lineages and their functions.
Main Results:
- Identification of six main CD4+ T cell lineages with distinct profiles.
- Elucidation of the structural basis for CD4+ T cell pathogen recognition.
- Understanding the heterogeneity and functional specialization of CD4+ T cells.
Conclusions:
- CD4+ T cell heterogeneity underpins diverse immune responses.
- Structural biology provides critical insights into immune cell recognition.
- Understanding CD4+ T cell lineages is key to controlling infections.
Abstract:
As a major arm of the cellular immune response, CD4+ T cells are important in the control and clearance of infections. Primarily described as helpers, CD4+ T cells play an integral role in the development and activation of B cells and CD8+ T cells. CD4+ T cells are incredibly heterogeneous, and can be divided into six main lineages based on distinct profiles, namely T helper 1, 2, 17 and 22 (Th1, Th2, Th17, Th22), regulatory T cells (Treg) and T follicular helper cells (Tfh). Recent advances in structural biology have allowed for a detailed characterisation of the molecular mechanisms that drive CD4+ T cell recognition. In this review, we discuss the defining features of the main human CD4+ T cell lineages and their role in immunity, as well as their structural characteristics underlying their detection of pathogens.
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