Ethanol Exposure Depletes Hepatic Pigment Epithelium-Derived Factor, a Novel Lipid Regulator
| Autor: | Arijeet K. Gattu, Jennifer A. Doll, Christine A. Shugrue, Anil B. Nagar, Mona Cornwell, Tom Kolodecik, Stephen J. Pandol, Fred S. Gorelick, Chuhan Chung |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Male
medicine.medical_specialty Cirrhosis Biology Article PEDF Internal medicine medicine Hepatic Stellate Cells Animals Humans Nerve Growth Factors Rats Wistar Eye Proteins Serpins Triglycerides Hepatology medicine.diagnostic_test Ethanol Fatty liver Gastroenterology Lipid metabolism Tissue inhibitor of metalloproteinase medicine.disease Lipid Metabolism Rats Fatty Liver Endocrinology Biochemistry Liver Matrix Metalloproteinase 9 Gelatinases Liver biopsy Hepatic stellate cell Matrix Metalloproteinase 2 Steatosis |
| Popis: | Ethanol abuse can lead to hepatic steatosis and evolve into cirrhosis and hepatocellular carcinoma. Pigment epithelium-derived factor (PEDF) is a multifunctional secreted glycoprotein that is expressed by hepatocytes. Proteomic, experimental, and clinical studies implicate PEDF's role in lipid regulation. Because matrix metalloproteinase (MMP)-2/9 activity regulates PEDF levels, we investigated whether PEDF degradation by MMPs has a permissive role in ethanol-induced hepatic steatosis.PEDF levels were examined in liver biopsy specimens from patients with ethanol-induced steatosis. Hepatic PEDF levels and MMP activity were assessed in 2 animal models of ethanol feeding (rats on an alcohol-containing liquid diet and mice given intragastric infusion of ethanol). The consequences of PEDF depletion in the liver were examined in PEDF-null mice.Liver biopsy samples from patients with ethanol-induced steatosis had reduced PEDF levels, compared with normal liver samples. Ethanol-fed animals had histologic steatosis and increased liver triglyceride content (P.05), as well as reduced levels of hepatic PEDF and increased MMP-2/9 activity. Ethanol-exposed hepatic lysates degraded PEDF in a MMP-2/9-dependent manner, and liver sections demonstrated abundant MMP-2/9 activity in situ. Addition of recombinant PEDF to PEDF-null hepatocytes, reduced their triglyceride content.Ethanol exposure leads to marked loss of hepatic PEDF in human livers and in 2 animal models of ethanol feeding. Loss of PEDF contributes to the accumulation of lipids in ethanol-induced hepatic steatosis. |
| Databáze: | OpenAIRE |
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