Abstract:
:In this report, we demonstrate that gp40, a molecule previously shown to be expressed by thymic epithelial cell lines in vitro and by thymic epithelial cells in vivo, is the murine homolog of human Ep-CAM, a calcium-independent homotypic adhesion molecule. gp40 is also expressed at low levels by thymocytes and peripheral T cells. In the adult thymus, gp40 expression was inversely related to the state of thymocyte maturation, with the highest levels associated with CD4-CD8- and CD4+CD8+ thymocyte populations. Ultrastructural immunohistochemistry revealed gp40 localization to areas of thymocyte/epithelial contact and demonstrated that gp40 is also expressed by thymic dendritic cells. During fetal development, thymocytes at days 14-16 of gestation expressed high levels of gp40. At later stages, the observed decline in the frequency of gp40+ cells and levels of expression correlated with the emergence of alpha beta+ thymocytes by day 18 of gestation. In short-term cultures, stimulation of unfractionated adult thymocytes with concanavalin A increased gp40 expression, particularly among CD3hi and CD3int thymocyte populations. This demonstration that Ep-CAM, initially considered to be expressed primarily by epithelial cells, is also expressed by thymocytes, T cells and antigen-presenting cells, raises the possibility that Ep-CAM may contribute to adhesive interactions between thymocytes and epithelial cells or dendritic cells, either in the context of thymocyte development or peripheral T cell trafficking and function.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Nelson AJ,Dunn RJ,Peach R,Aruffo A,Farr AGdoi
10.1002/eji.1830260220subject
Has Abstractpub_date
1996-02-01 00:00:00pages
401-8issue
2eissn
0014-2980issn
1521-4141journal_volume
26pub_type
杂志文章abstract::Several drugs targeting members of the TNF superfamily or TNF receptor superfamily (TNFRSF) are widely used in medicine or are currently being tested in therapeutic trials. However, their mechanism of action remains poorly understood. Here, we explored the effects of TNFRSF co-stimulation on murine Foxp3+ regulatory T...
journal_title:European journal of immunology
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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journal_title:European journal of immunology
pub_type: 临床试验,杂志文章
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更新日期:2001-05-01 00:00:00
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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pub_type: 杂志文章
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journal_title:European journal of immunology
pub_type: 杂志文章
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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