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The expression of T cell receptor-associated proteins during T cell ontogeny in man.

D Campana, G Janossy, E Coustan-Smith, P L Amlot, W T Tian, S Ip and L Wong
J Immunol January 1, 1989, 142 (1) 57-66;
D Campana
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G Janossy
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E Coustan-Smith
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P L Amlot
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W T Tian
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S Ip
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L Wong
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Abstract

The expression of TCR-associated molecules was examined in human fetal and postnatal tissues. From gestational wk 7 onward in the fetal liver, putative prothymocytes have been identified with cytoplasmic CD3 positivity (cCD3+). These immature cells are TdT- and do not express membrane CD3 (mCD3-) or TCR beta identified by beta F1, but show CD7 and CD45 positivity without CD1, CD2, CD5, CD4, CD8, CD10, and class II Ag. Their high proliferative activity is indicated by greater than 85% Ki67 positivity. After the 10th wk, beta F1+, mCD3+ cells also appear in the liver and these are mostly Ki67- but no TCR gamma delta-bearing cells can be identified at such an early stage of extrathymic development. In the mCD3- TdT-fetal thymus (10 1/2 to 18th wk) cCD3+, mCD3- CD1-blasts proliferate (Ki67+) and lack TCR-beta or TCR-gamma delta. The TdT-, CD1+ cortical thymocytes develop into TCR-beta + and WT31-positive (TCR-alpha beta +) cells. Subsequently TdT-positive thymocytes become detectable around 19 to 20 wk, and in such glands the peak of proliferative activity is seen among TdT+, cCD3+ cells which appear to acquire, in a regular sequence, cytoplasmic beta F1 (TCR-beta), mCD3, and TCR-alpha beta (WT31 positivity) together with the loss of TdT and Ki67 positivity. A newly described transitional population of cells is TdT-, beta F1+ but exhibits no detectable WT31 positivity. These cells correspond to the CD1+, mCD3+ thymocytes and are probably the targets of thymic selection. The cells of the TCR-gamma delta lineage, detected by mAb TCR-delta-1 and delta TCS1, are rare (0.02 to 0.5%) among thymocytes from gestational wk 10 1/2 onward through the whole span of thymic development, but these cells include a proportion (18 to 59%) of cells expressing CD1 Ag, suggesting that these TCR-gamma delta cells differentiate in the thymus. Among the CD1+, TCR-gamma delta + thymocytes, no TdT positivity can be detected.

  • Copyright © 1989 by American Association of Immunologists

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The Journal of Immunology
Vol. 142, Issue 1
1 Jan 1989
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The expression of T cell receptor-associated proteins during T cell ontogeny in man.
D Campana, G Janossy, E Coustan-Smith, P L Amlot, W T Tian, S Ip, L Wong
The Journal of Immunology January 1, 1989, 142 (1) 57-66;

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The expression of T cell receptor-associated proteins during T cell ontogeny in man.
D Campana, G Janossy, E Coustan-Smith, P L Amlot, W T Tian, S Ip, L Wong
The Journal of Immunology January 1, 1989, 142 (1) 57-66;
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Print ISSN 0022-1767        Online ISSN 1550-6606