Abstract:
:Glucocorticoids (GC) are potent anti-inflammatory and immunosuppressive agents that act on a variety of immune cells, including T cells, monocytes/macrophages, osteoclasts, and dendritic cells (DC). However, the mechanism(s) by which GC exert anti-inflammatory effects is still largely unknown. It is already well known that GC treatment inhibits DC maturation and interleukin (IL)-12 production by DC. In this study, we investigated the apoptosis induction of DC by a synthetic GC, dexamethasone (Dex). The stimulation with Dex resulted in DC apoptosis in a dose- and time-dependent manner as it was measured by determining annexin V-positive cells and mitochondrial potential. In contrast, monocytes that are precursor cells of DC are resistant to Dex-mediated apoptosis. The Dex-induced apoptosis of DC was independent of caspase activation because it was not inhibited by the broad caspase inhibitor, Z-VAD-fmk. It is interesting that agonistic CD40 antibody completely inhibited Dex-induced cell death, whereas other inflammatory stimuli did not show the same effect, suggesting that CD40 signaling may selectively modulate GC-mediated DC apoptosis. Taken together, our findings revealed an important role of GC and CD40 signaling in the regulation of immune responses in which DC play a key role in the inflammatory process of various immunomediated diseases.
journal_name
J Leukoc Bioljournal_title
Journal of leukocyte biologyauthors
Kim KD,Choe YK,Choe IS,Lim JSsubject
Has Abstractpub_date
2001-03-01 00:00:00pages
426-34issue
3eissn
0741-5400issn
1938-3673journal_volume
69pub_type
杂志文章abstract::Interactions between chemokines and their specific receptors are important for leukocyte trafficking. The CC-chemokine monocyte chemoattractant protein-1 (MCP-1) and its specific receptor CCR2 are essential in monocytic infiltration and have been associated with several inflammatory diseases. It has been reported that...
journal_title:Journal of leukocyte biology
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abstract::Microbicidal activity of neutrophils is usually measured by colony-counting techniques after cell lysis in distilled water. While studying the effect of the reduced nicotinamide adenine dinucleotide phosphate-oxidase inhibitor diphenyleneiodonium (DPI) on the staphylocidal activity of neutrophils, we obtained inconsis...
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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
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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
doi:10.1002/jlb.37.4.461
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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:2016-11-01 00:00:00
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journal_title:Journal of leukocyte biology
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abstract::Protein synthetic patterns of murine peritoneal macrophages were analyzed by two-dimensional polyacrylamide gel electrophoresis (2D PAGE) of 35S methionine-labeled proteins. While the protein synthetic patterns exhibited by resident, inflammatory, and activated macrophages had numerous common features that distinguish...
journal_title:Journal of leukocyte biology
pub_type: 杂志文章
doi:10.1002/jlb.41.6.527
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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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journal_title:Journal of leukocyte biology
pub_type: 杂志文章,评审
doi:10.1002/jlb.66.5.723
更新日期:1999-11-01 00:00:00
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journal_title:Journal of leukocyte biology
pub_type: 杂志文章
doi:
更新日期:2001-04-01 00:00:00
abstract::GenBank entries for mouse Il33 reveal the existence of two transcripts, Il33a and Il33b, with different 5'UTRs but coding for the same protein. We investigated expression of these transcripts in different mouse organs and cell types in basal and inflammatory conditions. Il33a and Il33b mRNAs start with different nonco...
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
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更新日期:2007-04-01 00:00:00
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journal_title:Journal of leukocyte biology
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journal_title:Journal of leukocyte biology
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doi:
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abstract::TNF is a pleiotropic cytokine involved in a variety of inflammatory processes and immune responses. TNF effects are mediated via two distinct membrane receptors: TNFR1 and TNFR2. Investigations concerning regulation and function of TNFR2 revealed a novel TNFR2 isoform in human and mouse cells, termed icp75TNFR, with m...
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abstract::IL-33 is a more recently identified member of the IL-1 cytokine family, expressed in the nucleus of epithelial cells and released into the extracellular space following tissue damage. The impact of IL-33 as a regulator of the adaptive immune response has been studied extensively, with an understood role for IL-33 in t...
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更新日期:2003-12-01 00:00:00