Abstract:
:Previous studies about basophils and mast cells identified the ability of IgE to up-regulate FcepsilonRI expression by a process that depends on stabilization of the surface receptor by IgE. However, the mechanism of loss from the cell surface, when unoccupied, is not known. The current studies have examined whether unoccupied FcepsilonRI on basophils is lost by shedding or endocytosis. IgE was dissociated partially from purified human basophils to augment loss of the unoccupied receptor, and comparisons were made between basophils +/- IgE resensitization prior to 1-day culture. Incubation did not result in a detectable receptor in culture supernatants. However, in the presence of IL-3, although total cell surface expression decreased by 30% (relative to resensitized cells), FcepsilonRI from whole cell lysates was not statistically different between the two conditions. Incubation for 18 h without IL-3 resulted in the same loss from the cell surface but equivalent loss in whole cell lysates. This degradation process was reversible with Bafilomycin A. There was also evidence that the internalized receptor could be recycled. After the initial 18-h down-regulation, the receptor could be found partially restored to the cell surface if IgE were added back to the culture +/- cycloheximide. Loss of the unoccupied receptor, as well as accumulation of the receptor under the influence of IgE, was found to be insensitive to the presence of a src-family kinase inhibitor, PP1. These studies establish that the unoccupied receptor is lost by a process of endocytosis, partially recycled to the cell surface, and ultimately degraded by a lysosomal mechanism.
journal_name
J Leukoc Bioljournal_title
Journal of leukocyte biologyauthors
MacGlashan DW Jrdoi
10.1189/jlb.0207103subject
Has Abstractpub_date
2007-10-01 00:00:00pages
1003-10issue
4eissn
0741-5400issn
1938-3673pii
jlb.0207103journal_volume
82pub_type
杂志文章abstract::Healthy donors infused with high doses of glucocorticoids [GCs; methyl-prednisolone (MP); 500 mg/day for 3 days] suffer a selective depletion of the CD14(+)CD16(+) monocytes such that these cells are reduced by 95% on day 5. In vitro studies revealed that at 11 h of culture in the presence of 10(-)(5) M MP, no depleti...
journal_title:Journal of leukocyte biology
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journal_title:Journal of leukocyte biology
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章
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journal_title:Journal of leukocyte biology
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journal_title:Journal of leukocyte biology
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pub_type: 杂志文章,评审
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abstract::Naïve T cells, when activated by specific antigen and cytokines, up-regulate adhesion molecules as well as chemokine receptors on their surface, which allows them to migrate to inflamed tissues. Human studies have shown that CXCR3 is one of the chemokine receptors that is induced during T cell activation. Moreover, CX...
journal_title:Journal of leukocyte biology
pub_type: 杂志文章
doi:10.1189/jlb.1102573
更新日期:2003-06-01 00:00:00
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journal_title:Journal of leukocyte biology
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更新日期:2010-12-01 00:00:00
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章,评审
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更新日期:2003-12-01 00:00:00
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章
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更新日期:2011-11-01 00:00:00
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章
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journal_title:Journal of leukocyte biology
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章
doi:10.1002/JLB.4MA1217-506R
更新日期:2018-09-01 00:00:00
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章
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更新日期:2011-06-01 00:00:00
abstract::Live, but not dead Bacillus Calmette-Guérin (BCG) is partially protective against infection by Mycobacterium tuberculosis, which causes a disease with high mortality in immune compromised individuals. We have shown that uptake of BCG induces maturation of immature dendritic cells (DCs) regardless of the viability of t...
journal_title:Journal of leukocyte biology
pub_type: 杂志文章
doi:
更新日期:2002-07-01 00:00:00
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更新日期:1996-12-01 00:00:00
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journal_title:Journal of leukocyte biology
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更新日期:2016-12-01 00:00:00
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章,评审
doi:
更新日期:2000-08-01 00:00:00
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journal_title:Journal of leukocyte biology
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更新日期:2009-09-01 00:00:00
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更新日期:2009-12-01 00:00:00
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更新日期:2012-09-01 00:00:00
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章
doi:
更新日期:1995-01-01 00:00:00
abstract::Successful remodeling of the uterine spiral arteries is essential for a complication-free pregnancy and is best described in terms of its morphologic features. The molecular mediators and cellular sources of spiral artery remodeling are not known, although a role for uterine leukocytes has been proposed. Immunohistoch...
journal_title:Journal of leukocyte biology
pub_type: 杂志文章
doi:10.1189/jlb.1A0815-351R
更新日期:2016-08-01 00:00:00