TY - JOUR
T1 - Intracellular B7-H4 suppresses bile duct epithelial cell apoptosis in human primary biliary cirrhosis
AU - Chen, Yongwen
AU - Guo, Guoning
AU - Guo, Sheng
AU - Shimoda, Shinji
AU - Shroyer, Kenneth R.
AU - Tang, Yuyu
AU - Wu, Yuzhang
N1 - Funding Information:
This work was supported by the National Key Basic Research Program of China (2007CB512401) and the National Natural Science Foundation of China (NSFC nos. 30800528 and 30700855).
PY - 2011/12
Y1 - 2011/12
N2 - The expression and function of B7-H4, a recently identified co-inhibitory molecule of the B7 superfamily, in the pathogenesis of primary biliary cirrhosis (PBC) is still unclear. Here the expression of B7-H4 in sections from PBC patients (n=16) was examined by immunohistochemistry and it was detected in primary bile duct epithelial cells (BECs) which were isolated from PBC patients by flow cytometry (FACs). Moreover, we also analyzed BECs-associated B7-H4 function through knock-down of its expression via RNA interference (RNAi) in vitro. Immunohistochemistry and FACs evidenced that the expression of B7-H4 was restricted in the cytoplasm of BECs from PBC patients, while it was completely absent in normal liver tissues. The cytoplasmic B7-H4 gene was cloned, and sequenced analysis showed it was encoded by the same gene to the membrane B7-H4. Interesting, silencing B7-H4 by specific RNAi resulted in enhanced FasL expression and BEC apoptosis. Conversely, interruption of Fas\FasL interaction with using FasL blocking antibodies (clone 4H9) reversed cell apoptosis. Our results suggested that the intracellular B7-H4 appears to prevent Fas/FasL-mediated BEC apoptosis during the progression of PBC, and indicates B7-H4 is a possible target for therapeutic intervention of this disease.
AB - The expression and function of B7-H4, a recently identified co-inhibitory molecule of the B7 superfamily, in the pathogenesis of primary biliary cirrhosis (PBC) is still unclear. Here the expression of B7-H4 in sections from PBC patients (n=16) was examined by immunohistochemistry and it was detected in primary bile duct epithelial cells (BECs) which were isolated from PBC patients by flow cytometry (FACs). Moreover, we also analyzed BECs-associated B7-H4 function through knock-down of its expression via RNA interference (RNAi) in vitro. Immunohistochemistry and FACs evidenced that the expression of B7-H4 was restricted in the cytoplasm of BECs from PBC patients, while it was completely absent in normal liver tissues. The cytoplasmic B7-H4 gene was cloned, and sequenced analysis showed it was encoded by the same gene to the membrane B7-H4. Interesting, silencing B7-H4 by specific RNAi resulted in enhanced FasL expression and BEC apoptosis. Conversely, interruption of Fas\FasL interaction with using FasL blocking antibodies (clone 4H9) reversed cell apoptosis. Our results suggested that the intracellular B7-H4 appears to prevent Fas/FasL-mediated BEC apoptosis during the progression of PBC, and indicates B7-H4 is a possible target for therapeutic intervention of this disease.
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U2 - 10.1007/s10753-010-9280-6
DO - 10.1007/s10753-010-9280-6
M3 - Article
C2 - 21120594
AN - SCOPUS:82955222281
SN - 0360-3997
VL - 34
SP - 688
EP - 697
JO - Inflammation
JF - Inflammation
IS - 6
ER -