Words similar to thymus
Example sentences for: thymus
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This fetal wild-type profile was very similar to that seen for fetal Rag mutant thymocytes, in contrast to adult Rag -/-thymus.
It is known that during clonal selection in the thymus, immature CD4, CD8 double positive cells develop into single positive CD4 or CD8 cells according to the relative affinity of their TCR to class II or class I molecules respectively [ 5 6 ] . These immature T-cells are selected in the thymic epithelium on the basis of their TCR interaction with either class I or class II MHC molecules [ 7 8 ] , thus generating two mutually exclusive subpopulations that are characterized by the expression of either CD4 or CD8 glycoproteins [ 9 ] . Earlier studies in the murine system have demonstrated that PMA and cAMP can modulate the expression CD4 and CD8 on developing thymocytes [ 10 11 12 13 ] . In keeping with these findings, ex vivo experiments with human thymocytes previously reported by our group, revealed that while phorbol esters can coordinately regulate the transcription of α and β TCR during intrathymic T cell differentiation [ 14 ] , cAMP selectively affected the transcription of the α and δ-TCR [ 15 16 ] . Together the murine data and our own findings support the hypothesis that in humans, TCR expression and CD4, CD8 commitment and selection may be regulated by the same signal-transduction pathways.
In addition, the percentages of BrdU +cells in TN1 and TN2 subsets in the Rag1 -/-fetal thymus were significantly higher than those of the wild type adults (P < 0.001).
As a result, it has not yet been demonstrated that anaphylactic reactions can develop to self peptides that are expressed in the thymus.
5 in the developing thymus, well before significant thymocyte maturation takes place [ 52 53 ] . Although the number of TECs is reduced by about 2-fold in Hoxa3 +/- Pax1 -/-compound mutants, the number of thymocytes is reduced by a slightly greater amount, around 3-fold [ 29 ] . Therefore, the reductions seen in cytokine message levels in the Hoxa3 +/- Pax1 -/-compound mutants are not secondary to decreased TEC numbers.
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