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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

CLIP-derived self peptides bound to MHC class II molecules of medullary thymic epithelial cells differ from those of

M Kasai1, H Kropshofer, A B Vogt

  • 1Department of Bacterial and Blood Products, National Institute of Infectious Diseases, Tokyo, Japan. kasai@nih.go.jp

European Journal of Immunology
|February 13, 2001
PubMed

Medullary thymic epithelial cells (mTEC) are able to present soluble antigens to CD4+ helper T cell lines, whereas cortical thymic epithelial cells (cTEC) are not (Mizuochi, T., et al., J. Exp. Med. 1992. 175: 1601-1605). In addition, class II heterodimers from mTEC migrated with apparently less relative molecular mass in SDS-PAGE than those from cTEC (Kasai, M., et al., Eur. J. Immunol. 1998. 28:1867-1876). To investigate the cause of the distinct migration profiles of class II heterodimers in both TEC types, class II heterodimer-associated peptides were analyzed by matrix-assisted laser desorption ionization mass spectrometry. Self peptides from cTEC were shown to vary moderately in length and to be highly diverse, including low amounts of CLIP (class II-associated invariant chain peptide) variants. On the other hand, self peptides from two mTEC consisted predominantly of two CLIP variants with exceptional C-terminal extensions. C-terminally overhanging residues of CLIP in mTEC may be responsible for the distinct migration of class II heterodimers in SDS-PAGE. Differences in migration of class II heterodimers on SDS gels was also observed in H2-DM+ vesicles isolated from both TEC. The possible contribution of self peptides bound to class II heterodimers in TEC to positive or negative selection of T cells in the thymus is discussed.

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