Naslov
Intrathymic lymphoid precursor cells during fetal thymus development

Autori
Antica, Mariastefania ; Wu, Li ; Shortman, Ken ; Scollay, Roland

Izvornik
Journal of immunology (0022-1767) 151 (1993), 11; 5887-5895

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
hematopoietic stem-cells ; adult-mouse thymus ; monoclonal-antibodies ; T-cells ; differentiation antigens ; thymocytes ; proliferation ; expression ; receptors ; kinetics

Sažetak
Our previous studies have demonstrated the presence, in the adult mouse thymus, of a population of early precursor cells able to give rise to T and B lymphocytes but not myeloid cells. This population of cells expresses low levels of CD4 and has been termed the "low CD4 precursors." All these precursors were found to be c-kit positive, and they precede the better known CD4-CD8- precursor stage. In this study, embryonic and neonatal thymuses were examined to see whether a similar low CD4 precursor was part of the pathway of T cell development during ontogeny. A population with the phenotypic characteristics of the adult low CD4 precursor was found from day 15 of embryonic development, although the expression of low levels of CD4 was apparent only from embryonic day 17. Functional tests of these putative precursors showed they had no thymus-reconstituting ability when isolated from thymuses at any time during embryonic life, and very low reconstituting ability even 24 days after birth. These results raise questions about the adult low CD4 precursor as an obligatory stage in the development of T cells in the thymus.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Temeljne medicinske znanosti

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