Schuman James, Chen Yuhong, Podd Andrew, Yu Mei, Liu Hong-Hsing, Wen Renren, Chen Zhijian J, Wang Demin
Blood Research Institute, BloodCenter of Wisconsin, Milwaukee 53226, USA.
Blood. 2009 May 7;113(19):4566-74. doi: 10.1182/blood-2008-08-176057. Epub 2009 Feb 5.
The kinase TAK1 is essential for T-cell receptor (TCR)-mediated nuclear factor kappaB (NF-kappaB) activation and T-cell development. However, the role of TAK1 in B-cell receptor (BCR)-mediated NF-kappaB activation and B-cell development is not clear. Here we show that B-cell-specific deletion of TAK1 impaired the transition from transitional type 2 to mature follicular (FO) B cells and caused a marked decrease of marginal zone (MZ) B cells. TAK1-deficient B cells exhibited an increase of BCR-induced apoptosis and impaired proliferation in response to BCR ligation. Importantly, TAK1-deficient B cells failed to activate NF-kappaB after BCR stimulation. Thus, TAK1 is critical for B-cell maturation and BCR-induced NF-kappaB activation.
激酶TAK1对于T细胞受体(TCR)介导的核因子κB(NF-κB)激活和T细胞发育至关重要。然而,TAK1在B细胞受体(BCR)介导的NF-κB激活和B细胞发育中的作用尚不清楚。在此我们表明,TAK1的B细胞特异性缺失损害了从过渡2型到成熟滤泡(FO)B细胞的转变,并导致边缘区(MZ)B细胞显著减少。TAK1缺陷的B细胞表现出BCR诱导的细胞凋亡增加,并且对BCR连接的反应增殖受损。重要的是,TAK1缺陷的B细胞在BCR刺激后未能激活NF-κB。因此,TAK1对于B细胞成熟和BCR诱导的NF-κB激活至关重要。