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Related Concept Videos

Methods of Nuclear Reprogramming01:24

Methods of Nuclear Reprogramming

Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for injury repair.
Primary Lymphoid Organs01:16

Primary Lymphoid Organs

Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...

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Related Experiment Video

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Foxn1 Protein Expression in the Developing, Aging, and Regenerating Thymus.

Immanuel Rode1, Vera C Martins2, Günter Küblbeck2

  • 1Division of Cellular Immunology, German Cancer Research Center, D-69120 Heidelberg, Germany; and i.rode@dkfz.de hr.rodewald@dkfz.de.

Journal of Immunology (Baltimore, Md. : 1950)
|November 6, 2015
PubMed
Summary

Forkhead box N1 (Foxn1) protein expression in thymic epithelial cells (TECs) is heterogeneous and changes with age and thymus regeneration. Novel tools reveal Foxn1 dynamics, offering insights into TEC development and function.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Biology

Background:

  • Forkhead box N1 (Foxn1) is crucial for thymic epithelial cell (TEC) development.
  • The precise function and expression patterns of Foxn1 protein in TECs are not well understood.
  • Existing knowledge gaps hinder a complete understanding of thymus development and function.

Purpose of the Study:

  • To develop novel tools for visualizing Foxn1 protein expression at single-cell resolution.
  • To investigate Foxn1 expression dynamics in TEC subsets during normal development, aging, injury, and regeneration.
  • To elucidate the role of Foxn1 in TEC heterogeneity and response to perturbations.

Main Methods:

  • Generation of Foxn1 knock-in mice with a C-terminal hemagglutinin-tagged Foxn1 protein.
  • Development of a cytometry-grade monoclonal anti-Foxn1 antibody.
  • Evaluation of Foxn1 expression patterns in TEC subsets using flow cytometry and analysis of thymus dynamics under various conditions.

Main Results:

  • Foxn1 protein expression is highly heterogeneous within the normal thymus, with significant populations of Foxn1(low) or Foxn1(-) TECs, particularly with increasing age.
  • Thymus regeneration following injury or perturbation is characterized by Foxn1 upregulation, but the timing and specific TEC subsets involved vary depending on the challenge.
  • Different treatments, such as dexamethasone, fibroblast growth factor 7, and castration, induce distinct changes in Foxn1(+) TEC subsets, highlighting context-dependent responses.

Conclusions:

  • Foxn1 protein expression is dynamic and heterogeneous in TECs, challenging the assumption of uniform expression.
  • Age-related accumulation of Foxn1(low/negative) TECs suggests a role in thymic aging.
  • Foxn1 expression is a responsive marker during thymus regeneration, with specific TEC subsets reacting differently to various stimuli.