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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...

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A Detailed Protocol for Characterizing the Murine C1498 Cell Line and its Associated Leukemia Mouse Model
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CD94 defines phenotypically and functionally distinct mouse NK cell subsets.

Jianhua Yu1, Min Wei, Hsiaoyin Mao

  • 1Department of Molecular Virology, Immunology, and Medical Genetics, The Ohio State University, Columbus, OH 43210, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|October 6, 2009
PubMed
Summary
This summary is machine-generated.

CD94 expression divides mouse natural killer (NK) cells into distinct subsets. The CD94-high NK subset exhibits superior proliferation, IFN-gamma production, and cytotoxicity, indicating its role in NK cell development and therapy.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Heterogeneous natural killer (NK) cell subsets are crucial for understanding NK cell biology, development, and NK cell-based therapies.
  • Identifying distinct NK cell subsets is vital for advancing research and therapeutic applications.

Purpose of the Study:

  • To investigate the role of CD94 surface expression in distinguishing functionally distinct mouse NK cell subsets.
  • To characterize the phenotypic and functional differences between CD94-defined NK cell populations.

Main Methods:

  • Analysis of CD94 surface expression on mouse NK cells across various organs and tissues.
  • Functional assays measuring proliferation, IFN-gamma production, and target cell lysis.
  • Phenotypic characterization using markers like NKG2A/C/E, CD117, CD69, Ly49D, and Ly49G2.
  • In vivo studies to track NK cell subset differentiation.

Main Results:

  • CD94 expression divides mouse NK cells into CD94-low and CD94-high subsets.
  • The CD94-high subset demonstrates enhanced proliferation, IFN-gamma production, and cytotoxicity compared to the CD94-low subset.
  • Distinct expression patterns of NKG2A/C/E, CD117, CD69, Ly49D, and Ly49G2 were observed between subsets.
  • In vivo studies showed that CD94-low NK cells can differentiate into CD94-high NK cells, but not vice versa.

Conclusions:

  • CD94 serves as a reliable antigen for identifying functionally distinct NK cell subsets in mice.
  • CD94 expression is a potential marker for late-stage mouse NK cell development.
  • These findings have implications for NK cell biology and the development of NK cell-based immunotherapies.