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Overexpression of LDOC1 in Human Biliary Epithelial Cells Inhibits Apoptosis Through NF-B Signaling

Song, Zai; Dong, Rui; Zhao, Rui; Zheng, Shan

Journal of Pediatric Gastroenterology & Nutrition:
doi: 10.1097/MPG.0b013e3182a7e1da
Original Articles: Hepatology and Nutrition
Abstract

Objectives: Biliary atresia (BA) is a devastating pediatric cholestatic liver disease. Increasing evidence indicates that nuclear factor (NF)-κB signaling plays a key role in the pathogenesis of BA. Leucine zipper downregulated in cancer 1 (LDOC1) may control the expression of NF-κB. The aim of this study was to evaluate the relation between LDOC1 and inflammation/apoptosis mediated by NF-κB in the human intrahepatic biliary epithelial cells (HIBECs).

Methods: HIBECs were divided into 3 treatment groups: control, mock transfection group, and LDOC1 transfection. Immunofluorescence, reverse transcription polymerase chain reaction, Western blot, and flow cytometry analysis were used to investigate the effectiveness of LDOC1-transfected HIBECs and the expression of NF-κB. Apoptosis was detected by Hochest/ propidium iodide staining. Interleukin (IL)-2 and tumor necrosis factor (TNF)-α levels were evaluated by enzyme-linked immunosorbent assay.

Results: The expression of NF-κB was higher in the LDOC1-transfected group when compared with the control and mock-transfected groups as evaluated by immunofluorescence, reverese transcription polymerase chain reaction, and Western blot analysis. The rate of apoptosis was significantly lower in the LDOC1-transfected group when compared with the control and mock-transfected groups. The levels of IL-2 and TNF-α were significantly higher in the LDOC1-transfected group when compared with the control and mock-transfected groups.

Conclusions: Upregulation of LDOC1 in HIBEC increases the expression of NF-κB, which may promote the activation of IL-2 and TNF-α secretion and inhibit cell apoptosis.

Author Information

Department of Pediatric Surgery, Children's Hospital of Fudan University, and Key Laboratory of Neonatal Disease, Ministry of Health, Shanghai, China.

Address correspondence and reprint requests to Shan Zheng, Department of Pediatric Surgery, Children's Hospital of Fudan University, and Key Laboratory of Neonatal Disease, Ministry of Health, 399 Wan Yuan Road, Shanghai 201102, China (e-mail: szheng@shmu.edu.cn).

Received 2 August, 2013

Accepted 2 August, 2013

Drs Song and Dong participated equally in this study and should be considered co-first authors.

This study received financial support from the National Natural Science Foundation of China (no. 30973139), and the Science Foundation of Shanghai (no. 09JC1402800 and no. 11JC1401300).

The authors report no conflicts of interest.

© 2013 by European Society for Pediatric Gastroenterology, Hepatology, and Nutrition and North American Society for Pediatric Gastroenterology,