当前位置： SCI文献检索 > THROMBOSIS AND HAEMOSTASIS期刊下所有文献 > Involvement of IRAKs and TRAFs in anti-β₂GPI/β₂GPI-induced tissue factor expression in THP-1 cells.

Involvement of IRAKs and TRAFs in anti-β₂GPI/β₂GPI-induced tissue factor expression in THP-1 cells.

Abstract：

:Our previous study has shown that Toll-like receptor 4 (TLR4) and its signalling pathway contribute to anti-β₂-glycoprotein I/β₂-glycoprotein I (anti-β₂GPI/β₂GPI)-induced tissue factor (TF) expression in human acute monocytic leukaemia cell line THP-1 and annexin A2 (ANX2) is involved in this pathway. However, its downstream molecules have not been well explored. In this study, we have established that interleukin-1 receptor-associated kinases (IRAKs) and tumour necrosis factor receptor-associated factors (TRAFs) are crucial downstream molecules of anti-β₂GPI/β₂GPI-induced TLR4 signaling pathway in THP-1 cells and explored the potential mechanisms of their self-regulation. Treatment of THP-1 cells with anti-β₂GPI/β₂GPI complex induced IRAKs and TRAFs expression and activation. Anti-β₂GPI/β₂GPI complex firstly induced expression of IRAK4 and IRAK1, then IRAK1 phosphorylation and last IRAK3 upregulation. In addition, anti-β₂GPI/β₂GPI complex simultaneously and acutely enhanced mRNA levels of TRAF6, TRAF4 and zinc finger protein A20 (A20), while chronically increased A20 protein level. Moreover, anti-β₂GPI/β₂GPI complex-induced IRAKs and TRAFs expression and activation were attenuated by knockdown of ANX2 by infection with ANX2-specific RNA interference lentiviruses (LV-RNAi-ANX2) or by treatment with paclitaxel, which inhibits TLR4 as an antagonist of myeloid differentiation protein 2 (MD-2) ligand. Furthermore, both IRAK1/4 inhibitor and a specific proteasome inhibitor MG-132 could attenuate TRAFs expression as well as TF expression induced by anti-β₂GPI/β₂GPI complex. In conclusion, our results indicate that IRAKs and TRAFs play important roles in anti-β₂GPI/β₂GPI-stimulated TLR4/TF signaling pathway in THP-1 cells and contribute to the pathological processes of antiphospholipid syndrome (APS).

journal_name

Thromb Haemost

journal_title

Thrombosis and haemostasis

authors

Xu G,Wen H,Zhou H,Guo D,Zhou F,Chen D,Xie H,Wang T,Wang H

doi

10.1160/TH11-04-0229

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

1158-69

issue

6

eissn

0340-6245

issn

2567-689X

pii

11-04-0229

journal_volume

106

pub_type

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