Hepatic Gene Expression in Protoporphyic Fech Mice Is Associated with Cholestatic Injury but Not a Marked Depletion of the Heme Regulatory Pool
| Autor: | David J. Judah, David Dinsdale, R.E. Edwards, Bruce Clothier, Andrew G. Smith, Peter Greaves, Reginald Davies, Arenda Schuurman, Colin R. Barker, Fiona M. Higginson, Timothy W. Gant, Tatyana Chernova |
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| Rok vydání: | 2005 |
| Předmět: |
Hemeproteins
Male Aging medicine.medical_specialty Antifungal Agents HMOX1 Protoporphyria Erythropoietic Cytochrome Immunoblotting Gene Expression Protoporphyrins Heme Griseofulvin Pathology and Forensic Medicine Mice chemistry.chemical_compound Internal medicine medicine Animals Regulation of gene expression Cholestasis biology Reverse Transcriptase Polymerase Chain Reaction Gene Expression Profiling Cytochrome P450 Ferrochelatase medicine.disease Original Research Paper Disease Models Animal Endocrinology Gene Expression Regulation Liver Biochemistry chemistry biology.protein Protoporphyrin Erythropoietic protoporphyria |
| Zdroj: | The American Journal of Pathology. 166:1041-1053 |
| ISSN: | 0002-9440 |
| DOI: | 10.1016/s0002-9440(10)62325-5 |
| Popis: | BALB/c Fech(m1Pas) mice have a mutated ferrochelatase gene resulting in protoporphyria that models the hepatic injury occurring sporadically in human erythropoietic protoporphyria. We used this mouse model to study the development of the injury and to compare the dysfunction of heme synthesis with hepatic gene expression of liver metabolism, oxidative stress, and cellular injury/inflammation. From an early age expression of total cytochrome P450 and many of its isoforms was significantly lower than in wild-type mice. However, despite massive accumulation of protoporphyrin in the liver, expression of the main genes controlling heme synthesis and catabolism (Alas1 and Hmox1, respectively) were only modestly affected even in the presence of the cytochrome P450-inducing CAR agonist 1,4-bis[2-(3,5-dichloropyridyloxy)]benzene. In contrast, in BALB/c mice exhibiting griseofulvin-induced hepatic protoporphyria with induction and destruction of cytochrome P450, both Alas1 and Hmox1 genes were markedly up-regulated. Other expression profiles in BALB/c Fech(m1Pas) mice identified roles for oxidative mechanisms in liver injury while modulated gene expression of hepatocyte transport proteins and cholesterol and bile acid synthesis illustrated the development of cholestasis. Subsequent inflammation and cirrhosis were also shown by the up-regulation of cytokine, cell cycling, and procollagen genes. Thus, gene expression profiles studied in Fech(m1Pas) mice may provide candidates for human polymorphisms that explain the sporadic hepatic consequences of erythropoietic protoporphyria. |
| Databáze: | OpenAIRE |
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