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Transforming growth factor beta1 gene variation Leu10Pro affects secretion and function in hepatic cells
1Department of Laboratory Medicine, Eastern Hepatobiliary Hospital, Second Military Medical University, 225 Changhai Road, Shanghai 200438, China.
Digestive Diseases and Sciences
|May 23, 2012
Summary
Transforming growth factor beta1 (TGFβ1) gene variation at codon 10 influences its secretion and function in liver cells, impacting liver disease development. This study reveals Pro10 enhances TGFβ1 secretion and cell proliferation.
Area of Science:
- Hepatology and Molecular Biology
- Genetics and Genomics
Background:
- Previous research linked transforming growth factor beta1 (TGFβ1) gene polymorphisms to liver cancer and cirrhosis susceptibility.
- Functional studies of TGFβ1 gene variations in hepatic cells were previously lacking.
Purpose of the Study:
- To elucidate the functional mechanisms of TGFβ1 gene polymorphisms in liver disease pathogenesis.
- To investigate the impact of TGFβ1 codon 10 Leu/Pro variation on hepatic cell function.
Main Methods:
- Constructed recombinant TGFβ1 expression plasmids with CMV promoter for Leu/Pro variation at codon 10.
- Transfected plasmids into human hepatoma, hepatic stellate, and immortalized hepatocyte cell lines.
- Assessed TGFβ1 secretion (ELISA), cell apoptosis, proliferation, and marker expression (flow cytometry).
Main Results:
- Cells transfected with CMV-Pro10 showed significantly higher TGFβ1 secretion than CMV-Leu10.
- CMV-Pro10 conferred greater apoptosis protection and induced more proliferation in hepatic cells.
- Pro10 variation upregulated CD105 and downregulated CD83 expression.
Conclusions:
- TGFβ1 gene Leu10Pro variation in the signal peptide critically affects TGFβ1 secretion and function in hepatic cells.
- This variation plays a significant role in the molecular mechanisms underlying liver disease progression.
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