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Isolation, Identification, and Purification of Murine Thymic Epithelial Cells
07:20

Isolation, Identification, and Purification of Murine Thymic Epithelial Cells

Published on: August 8, 2014

Epithelial heterogeneity in the murine thymus: a cell surface glycoprotein expressed by subcapsular and medullary

A Farr1, A Nelson, J Truex

  • 1Department of Biological Structure, University of Washington, Seattle 98195.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|May 1, 1991
PubMed

Insights

A new monoclonal antibody, G8.8, identifies a cell surface molecule on murine medullary thymic epithelial cells. This molecule is crucial during early thymic development and also found in other epithelial tissues.

Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Biology

Background:

  • Thymic epithelial cells are critical for T-cell development.
  • Specific markers for medullary thymic epithelial cells are needed to understand thymic ontogeny.
  • Monoclonal antibodies are valuable tools for identifying cell-specific surface molecules.

Purpose of the Study:

  • To generate and characterize a monoclonal antibody (MAb) against murine medullary thymic epithelial cells.
  • To identify the cell surface molecule recognized by the MAb.
  • To investigate the expression pattern and developmental role of this molecule.

Main Methods:

  • Generation of MAb G8.8 against glycoconjugates from murine medullary thymic epithelial cells.
  • Flow cytometry and immunohistochemistry to assess MAb reactivity.
  • Immunoelectron microscopy for ultrastructural localization.
  • Immunoprecipitation to determine the molecular weight of the target antigen.

Main Results:

  • MAb G8.8 specifically labels cells in the subcapsular and medullary areas of the murine thymus.
  • The target molecule is expressed on the cell surface of epithelial cells with characteristic ultrastructural features.
  • G8.8+ cells are abundant during early fetal thymic development, with distinct cortical and medullary compartments emerging later.
  • Immunoprecipitation identified a cell surface molecule of approximately 38-42 kDa.
  • The MAb also reacted with gut, epidermal, and kidney tubular epithelium, but not liver epithelium.

Conclusions:

  • MAb G8.8 recognizes a novel cell surface molecule predominantly expressed on medullary thymic epithelial cells.
  • This molecule plays a significant role during early thymic ontogeny.
  • The antigen's presence in other epithelial tissues suggests broader functional implications.

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