Abstract
Background
Our previous work revealed transforming growth factor beta1 (TGFβ1) gene polymorphisms are associated with susceptibility to hepatocellular carcinoma and liver cirrhosis. However, no further study of functional substitution in hepatic cells has yet been reported.
Aims
This study was designed to uncover the functional mechanisms of TGFβ1 gene polymorphisms in the pathogenesis of liver diseases.
Methods
Two recombinant TGFβ1 expression plasmids containing TGFβ1 codon 10 Leu/Pro variation were constructed with CMV promoter and transfected into human hepatoma cell lines (HepG2 and SMMU 7721), hepatic stellate cells (LX-2), and immortalized hepatocytes (L02). The secretion capacities of TGFβ1 protein in the transfected cells were determined by ELISA. Apoptosis, proliferative activity, and expression of CD 105, CD83, and CD80 were also measured by use of flow cytometry.
Results
The ELISA results showed that cells transfected with CMV-Pro10 were more capable of TGFβ1 secretion than those transfected with CMV-Leu10. Functionally, CMV-Pro10 was more apoptosis-protective and induced more proliferation than CMV-Leu10 in transfected hepatic cells. Pro10 up-regulated expression of CD105 and down-regulated expression of CD83.
Conclusions
TGFβ1 gene Leu10Pro variation in signal peptide has significant effects on TGFβ1 secretion and functions in hepatic cells.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (nos 30770994 and 81000904) and the Shanghai Committee of Science and Technology (no. 10411955200). The authors are grateful to Professor Scott L. Friedman in America for providing us with the LX-2 cell line and to Linzhen Zhang in Shanghai Changzheng Hospital for her technical support.
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We declare that we have no conflicts of interest in the submission of this manuscript.
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Xing Gu, Xin Ji, and Le-Hua Shi contributed equally to this work.
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Gu, X., Ji, X., Shi, LH. et al. Transforming Growth Factor beta1 Gene Variation Leu10Pro Affects Secretion and Function in Hepatic Cells. Dig Dis Sci 57, 2901–2909 (2012). https://doi.org/10.1007/s10620-012-2238-9
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DOI: https://doi.org/10.1007/s10620-012-2238-9