Abstract:
:Serine proteinases have been recognized as playing an important role in inflammation via proteinase activated receptors (PARs). However, little is known about the influence of serine proteinases and PARs on TNF secretion from highly purified T cells. We challenged T cells from human peripheral blood with serine proteinases and agonist peptides of PARs and measured the levels of TNF in culture supernatants by ELISA. The results showed that thrombin and trypsin, but not tryptase, stimulated approximately up to 2.5-fold increase in TNF release from T cells following 16 h incubation. Proteinase inhibitors and PAR-1 antagonist SCH 79797 almost completely abolished thrombin- and trypsin-induced TNF release from T cells. Agonist peptides of PAR-1, but not PAR-2 induced TNF release from T cells. Moreover, trypsin- and thrombin-induced upregulated expression of TNF was observed in CD4+, IL-4+, or CD25+ T cells, but not in IFN+ or IL-17+ T cells. The signaling pathways MAPK/ERK and PI3K/Akt are involved in the thrombin- and trypsin-induced TNF release from T cells. In conclusion, thrombin and trypsin can induce TNF release from IL-4+ and CD25+ T cells through activation of PAR-1 and therefore contribute to regulation of immune response and inflammation of the body.
journal_name
Mediators Inflammjournal_title
Mediators of inflammationauthors
Yang H,Li T,Wei J,Zhang H,He Sdoi
10.1155/2013/165453subject
Has Abstractpub_date
2013-01-01 00:00:00pages
165453eissn
0962-9351issn
1466-1861journal_volume
2013pub_type
杂志文章abstract::Fat loss is associated with shorter survival and reduced quality of life in cancer patients. Effective intervention for fat loss in cachexia requires identification of the condition using prognostic biomarkers for early detection and prevention of further depletion. No biomarkers of fat mass alterations have been defi...
journal_title:Mediators of inflammation
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journal_title:Mediators of inflammation
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pub_type: 杂志文章,随机对照试验
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journal_title:Mediators of inflammation
pub_type: 杂志文章,收录出版
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journal_title:Mediators of inflammation
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journal_title:Mediators of inflammation
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journal_title:Mediators of inflammation
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journal_title:Mediators of inflammation
pub_type: 杂志文章
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journal_title:Mediators of inflammation
pub_type: 杂志文章
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journal_title:Mediators of inflammation
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journal_title:Mediators of inflammation
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