Document Detail


Uroporphyria in the uroporphyrinogen decarboxylase-deficient mouse: Interplay with siderosis and polychlorinated biphenyl exposure.
MedLine Citation:
PMID:  12297827     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Several methods have been used to develop rodent models with the hepatic manifestations of porphyria cutanea tarda (PCT). Acute iron administration or mutations of the hemochromatosis gene (Hfe) have been used to generate hepatic siderosis, a nearly uniform finding in PCT. Heterozygosity for a null mutation at the uroporphyrinogen decarboxylase (Uro-D+/-) locus has been developed to mimic familial PCT in humans. This study examines the interplay of these 2 genetic risk factors and their influence, alone and combined with polychlorinated-biphenyl exposure. Neither an Hfe-null mutation nor iron-dextran administration alone or in combination with polychlorinated biphenyl exposure was porphyrinogenic in a 3-week model using mice wild-type at the Uro-D locus. Homozygosity for an Hfe-null mutation significantly elevated hepatic iron but not to the extent seen with parenteral iron-dextran administration. Homozygosity for an Hfe-null mutation but not iron-dextran administration was porphyrinogenic in animals heterozygous for the Uro-D mutation. Polychlorinated biphenyls were also porphyrinogenic in these animals. Uroporphyria in Uro-D+/- animals was exacerbated by combinations of the homozygous Hfe-null mutation and polychlorinated biphenyls and iron-dextran and polychlorinated biphenyls. In all cases in which uroporphyria developed, a greater degree of experimental uroporphyria was seen in female animals. All elevated hepatic uroporphyrin concentrations were accompanied by depressed uroporphyrinogen decarboxylase activity and the presence of a factor in cytosol that inhibits recombinant human uroporphyrinogen decarboxylase. In conclusion, the expression of the uroporphyric phenotype, dependent on the susceptibility imparted by a genetic mutation, provides a uniquely facile model for dissecting the molecular pathogenesis of the disease.
Authors:
Michael R Franklin; John D Phillips; James P Kushner
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Hepatology (Baltimore, Md.)     Volume:  36     ISSN:  0270-9139     ISO Abbreviation:  Hepatology     Publication Date:  2002 Oct 
Date Detail:
Created Date:  2002-09-25     Completed Date:  2002-10-24     Revised Date:  2014-09-14    
Medline Journal Info:
Nlm Unique ID:  8302946     Medline TA:  Hepatology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  805-11     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Antithyroid Agents / pharmacology
Chlorodiphenyl (54% Chlorine) / pharmacology
Disease Models, Animal
Female
Genotype
Hemochromatosis / genetics
Iron / analysis
Iron-Dextran Complex / pharmacology
Liver / chemistry,  enzymology
Male
Mice
Mice, Inbred C57BL
Mice, Knockout
Phenotype
Polychlorinated Biphenyls / pharmacology*
Porphyria Cutanea Tarda / complications,  genetics*
Porphyrins / analysis
Siderosis / complications,  genetics*
Uroporphyrinogen Decarboxylase / genetics*
Grant Support
ID/Acronym/Agency:
DK20503/DK/NIDDK NIH HHS; R01 DK020503/DK/NIDDK NIH HHS
Chemical
Reg. No./Substance:
0/Antithyroid Agents; 0/Porphyrins; 11097-69-1/Chlorodiphenyl (54% Chlorine); 9004-66-4/Iron-Dextran Complex; DFC2HB4I0K/Polychlorinated Biphenyls; E1UOL152H7/Iron; EC 4.1.1.37/Uroporphyrinogen Decarboxylase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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