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The way a set of data is measured is called its level of measurement. Correct statistical procedures depend on a researcher being familiar with levels of measurement. For analysis, data are classified into four levels of measurement—nominal, ordinal, interval, and ratio.
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Measuring Thymic Clonal Deletion at the Population Level.

Elise R Breed1, Masashi Watanabe2, Kristin A Hogquist3

  • 1Department of Laboratory Medicine and Pathology, Center for Immunology, University of Minnesota Medical School, Minneapolis, MN 55455; and.

Journal of Immunology (Baltimore, Md. : 1950)
|April 24, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a new assay to measure T cell clonal deletion at the population level, revealing that most deletion occurs in the cortex and relies on bone marrow-derived APCs and CD28 costimulation.

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Area of Science:

  • Immunology
  • T cell biology
  • Self-tolerance

Background:

  • Clonal deletion of T cells is crucial for preventing autoimmunity.
  • Previous studies focused on single T cell receptors or specificities.
  • Understanding clonal deletion at the population level is limited.

Purpose of the Study:

  • To develop and validate an assay for measuring T cell clonal deletion at the population level.
  • To investigate the anatomical sites and cellular drivers of clonal deletion.
  • To explore the role of costimulation in clonal deletion.

Main Methods:

  • Developed an assay measuring cleaved caspase 3 to quantify clonal deletion.
  • Utilized CCR7 expression to approximate the anatomical site of deletion.
  • Investigated the role of bone marrow-derived antigen-presenting cells (APCs) and CD28 costimulation.

Main Results:

  • 78% of clonal deletion events occur in the thymic cortex.
  • Medullary deletion occurs at semimature and mature stages, with mature events linked to failed regulatory T cell induction.
  • Bone marrow-derived APCs drive approximately half of deletion events, and both cortical and medullary deletion require CD28 costimulation.

Conclusions:

  • The novel assay enables the study of clonal deletion within the polyclonal T cell repertoire.
  • This work elucidates the distribution and requirements of T cell clonal deletion in the thymus.
  • Findings highlight the importance of APCs and costimulation in maintaining self-tolerance.