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Functional roles of Cot/Tpl2 in mast cell responses to lipopolysaccharide and FcεRI-clustering.

Abstract：

:Cot/Tpl2, a member of MAP kinase kinase kinase (MAPKKK), is indispensable for the ERK activation, as well as the production of TNF-α, IL-1β, IL-23, and PGE(2) in lipopolysaccharide (LPS)-stimulated macrophages. However, the expression and the functional roles of Cot/Tpl2 in mast cells have not been elucidated. The administration of LPS impairs allergic airway inflammation in a mast cell-dependent manner, and LPS stimulates mast cells to produce not only pro-inflammatory cytokines, such as IL-6 and TNF-α, but also Th2-type cytokines, such as IL-5, IL-10 and IL-13. Here, we examine the role of Cot/Tpl2 by using bone marrow-derived mast cells (BMMCs) from cot/tpl2 gene-deficient mice. Phosphorylation of ERKs was significantly decreased, whereas that of JNKs and p38 kinase was normal in LPS-stimulated cot/tpl2(-/-) BMMCs compared with wild-type counterparts. LPS-induced mRNA increase was significantly impaired for IL-5, IL-10, IL-13, and TNF-α, but was normal for IL-6, in cot/tpl2(-/-) BMMCs. On the other hand, degranulation by FcεRI-clustering from cot/tpl2(-/-) BMMCs was significantly enhanced compared with the WT control. Although the phosphorylation of ERKs and p38 kinase by FcεRI-clustering was similar in WT and cot/tpl2(-/-) BMMCs, the phosphorylation of Syk was significantly enhanced in cot/tpl2(-/-) BMMCs, which seemed to be due to the increased protein concentration of Syk. These results imply the functional importance of Cot/Tpl2 in mast cells during the course of allergic diseases such as asthma.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Chiba N,Kakimoto K,Masuda A,Matsuguchi T

doi

10.1016/j.bbrc.2010.08.075

subject

Has Abstract

pub_date

2010-11-05 00:00:00

pages

1-6

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(10)01570-6

journal_volume

402

pub_type

杂志文章

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