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S-adenosylmethionine and proliferation: new pathways, new targets
Nuria Martínez-López1, Marta Varela-Rey, Usue Ariz
1Unidad de Metabolómica, CIC bioGUNE (Asociacion Centro de Investigación Cooperativa en Biociencias), Parque Tecnológico de Bizkaia, Edificio 801A, 48160 Derio (Bizkaia), Spain.
Biochemical Society Transactions
|September 17, 2008
Summary
S-adenosylmethionine (SAMe) is vital for cell metabolism and liver health. Dysregulation of SAMe impacts liver injury and disease, highlighting its role in hepatocellular carcinoma development.
Area of Science:
- Biochemistry
- Cell Biology
- Hepatology
Background:
- S-adenosylmethionine (SAMe) is the primary cellular methyl donor, synthesized by methionine adenosyltransferase (MAT).
- SAMe integrates polyamine, transmethylation, and transsulfuration pathways within the methionine cycle.
- SAMe regulates critical cellular processes including metabolism, proliferation, differentiation, and apoptosis.
Purpose of the Study:
- To investigate the role of SAMe in hepatocyte proliferation and liver disease.
- To explore the involvement of AMPK and HuR in SAMe-modulated signaling pathways.
- To utilize genetically modified mouse models to study methionine metabolism in liver injury.
Main Methods:
- Analysis of SAMe's role in hepatocyte growth factor (HGF)-mediated cell growth.
- Investigation of methionine metabolism abnormalities in alcoholic liver injury models.
- Generation and analysis of MAT1A and GNMT knockout mice.
Main Results:
- SAMe modulates AMPK and HuR in HGF-mediated hepatocyte proliferation.
- Aberrant methionine metabolism and altered SAMe levels are linked to liver injury.
- MAT1A and GNMT knockout mice exhibit steatosis and hepatocellular carcinoma (HCC), mirroring human liver disease.
Conclusions:
- SAMe is a key regulator of liver metabolism and cell signaling.
- Disruptions in SAMe metabolism contribute to liver pathologies, including HCC.
- MAT1A and GNMT knockout models are valuable tools for understanding liver disease mechanisms and identifying therapeutic targets.
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