Abstract:
:The delivery of T-cell help to B cells is antigen-specific, MHC-restricted, and CD40L (CD154) dependent. It has been thought that when a T cell recognizes an antigen-presenting B cell, CD40L expressed on the T-cell surface engages with CD40 on the surface of B cells as long as the cells remain conjugated. By adding fluorescently labeled anti-CD40L antibody during overnight incubation of antigen-presenting B cells with antigen-specific T cells, we discovered that CD40L does not remain on the surface of the T cell, but it is transferred to and endocytosed by B cells receiving T-cell help. In the presence of anti-CD40L antibody, transferred CD40L is nearly absent on bystander B cells that are not presenting antigen, and the bystander cells do not become activated. Because transfer of CD40L to B cells correlates with B-cell activation, we speculate that persistence of helper T-cell-derived CD40L on or in B cells could permit sustained CD40 signaling enabling survival and proliferation of antigen-presenting B cells following brief interactions with helper T cells in vivo in germinal centers.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Gardell JL,Parker DCdoi
10.1002/eji.201646504subject
Has Abstractpub_date
2017-01-01 00:00:00pages
41-50issue
1eissn
0014-2980issn
1521-4141journal_volume
47pub_type
杂志文章abstract::The involvement of the CD2 (T11) molecule, an alternative activation pathway for T lymphocytes, in the regulation of tumor necrosis factor (TNF)-alpha/TNF receptor system in human T lymphocytes has been investigated. It has been found that both TNF-alpha synthesis and secretion were induced after incubation of purifie...
journal_title:European journal of immunology
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doi:10.1002/eji.1830221219
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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
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journal_title:European journal of immunology
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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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journal_title:European journal of immunology
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更新日期:2010-05-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830120809
更新日期:1982-08-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/(SICI)1521-4141(199810)28:10<3214::AID-IMM
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journal_title:European journal of immunology
pub_type: 评论,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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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: 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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