A pTalpha-negative subpopulation of CD25+ TN thymocytes revealed by a transgenic marker.
Författare
Summary, in English
We have recently generated 5'lambda5-huTAC mice, which express the human CD25 (huTAC) gene under the control of the 5'-flanking region of the mouse lambda5-gene. The huTAC-transgene was expressed in pre-B cells but neither in mature B cells nor in T cells of these mice. In this report we demonstrate that the transgene is also transiently expressed by adult CD25+ CD3-CD4-CD8- (triple negative, TN) thymocytes and in fetal thymocytes. The huTAC+, in contrast to the huTAC- subpopulation of the CD44+CD25+ TN cells, was unexpectedly found not to express the pTalpha-gene. Still the huTAC+CD44+CD25+ TN cells reconstituted the development of both alphabeta and gammadelta lineage cells equally efficiently as the pTalpha-expressing huTAC- fraction, demonstrating that this pTalpha-negative subpopulation contained precursors for both T-cell lineages. Single cell reverse transcription-polymerase chain reaction (RT-PCR) experiments demonstrated that also in normal mice only a fraction of CD44+CD25+ and CD44-CD25+ TN cells expressed this gene. Taken together, these data indicate that huTAC transgene expression revealed a truly pTalpha-negative fraction of the CD44+CD25+ TN cells. The observation that not all precursors in the CD25+ TN population express the pTalpha-gene has important implications for the understanding of early T-cell development and T-cell lineage commitment.
Avdelning/ar
- Immunology
Publiceringsår
2002
Språk
Engelska
Sidor
119-128
Publikation/Tidskrift/Serie
Scandinavian Journal of Immunology
Volym
55
Issue
2
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Wiley-Blackwell
Ämne
- Immunology in the medical area
Nyckelord
- Antigen
- T-Cell
- gamma-delta/metabolism
- Receptors
- Interleukin-2/*genetics/*metabolism
- alpha-beta/metabolism
- Transgenic
- Mice
- Membrane Glycoproteins/*genetics
- Liver/cytology/immunology
- Hematopoietic Stem Cells/immunology
- Genetic Markers
- Reporter
- Genes
- Gene Expression
- Fetus/cytology/immunology
- B-Lymphocytes/immunology
- CD44/metabolism
- Animal
- Antigens
- T-Lymphocyte Subsets/*immunology
- Thymus Gland/cytology/immunology
Status
Published
Forskningsgrupp
- Immunology
ISBN/ISSN/Övrigt
- ISSN: 1365-3083