Differential regulation of the release of tumor necrosis factor-alpha and of eicosanoids by mast cells in rat airways after antigen challenge

Differential regulation of the release of tumor necrosis factor-alpha and of eicosanoids by mast cells in rat airways after antigen challenge

Author Trezena, A. G. Google Scholar
Silva, Z. L. da Google Scholar
Oliveira, R. M. Google Scholar
Damazo, Amilcar Sabino Autor UNIFESP Google Scholar
Straus, Anita Hilda Autor UNIFESP Google Scholar
Takahashi, Helio Kiyoshi Autor UNIFESP Google Scholar
Oliani, Sonia Maria Autor UNIFESP Google Scholar
Lima, W. T. de Google Scholar
Institution Universidade de São Paulo (USP)
Butantan Inst
Dept Biol IBILCE
Universidade Federal de São Paulo (UNIFESP)
Abstract Background: Rat trachea display a differential topographical distribution of connective tissue mast cells (CTMC) and mucosal mast cells (MMC) that may imply regional differences in the release of allergic mediators such as tumor necrosis factor-alpha (TNF-alpha) and eicosanoids.Aim: To evaluate the role of CTMC and MMC for release of TNF-alpha and eicosanoids after allergenic challenge in distinct segments of rat trachea.Materials and methods: Proximal trachea ( PT) and distal trachea (DT) from ovalbumin (OVA)-sensitized rats, treated or not with compound 48/80 ( 48/80) or dexamethasone, were incubated in culture medium. After OVA challenge, aliquots were collected to study release of TNF-alpha and eicosanoids.Results: Release of TNF-alpha by PT upon OVA challenge peaked at 90 min and decayed at 6 and 24 h. Release from DT peaked at 30-90 min and decayed 6 and 24 h later. When CTMC were depleted with 48/80, OVA challenge exacerbated the TNF-alpha release by PT at all time intervals, while DT exacerbated TNF-alpha levels 6 and 24 h later only. Dexamethasone reduced TNF-alpha production after 90 min of OVA challenge in PT and at 3 and 6h in DT. OVA challenge increased prostaglandin D-2 in DT and leukotriene B-4 in both segments but did not modify prostaglandin E-2 and leukotriene C-4 release.Conclusion: OVA challenge induces TNF-alpha release from MMC, which is negatively regulated by CTMC. the profile of TNF-alpha and eicosanoids depends on the time after OVA challenge and of the tracheal segment considered.
Keywords TNF
eicosanoids
mast cells
airways
asthma
rat
Language English
Date 2003-08-01
Published in Mediators of Inflammation. Basingstoke: Carfax Publishing, v. 12, n. 4, p. 237-246, 2003.
ISSN 0962-9351 (Sherpa/Romeo, impact factor)
Publisher Carfax Publishing
Extent 237-246
Origin http://dx.doi.org/10.1080/09629350310001599684
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000185506700007
URI http://repositorio.unifesp.br/handle/11600/27335

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