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Increased mitochondrial respiratory chain enzyme activities correlate with minor extent of liver damage in mice suffering from erythropoietic protoporphyria
Author(s) -
Navarro Susana,
Del Hoyo Pilar,
Campos Yolanda,
Abitbol Marie,
MoránJiménez MaríaJosé,
GarcíaBravo María,
Ochoa Pilar,
Grau Montserrat,
Montagutelli Xavier,
Frank Jorge,
Garesse Rafael,
Arenas Joaquín,
De Salamanca Rafael Enríquez,
Fontanellas Antonio
Publication year - 2005
Publication title -
experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 96
eISSN - 1600-0625
pISSN - 0906-6705
DOI - 10.1111/j.0906-6705.2005.00248.x
Subject(s) - ferrochelatase , erythropoietic protoporphyria , mitochondrial respiratory chain , respiratory chain , mitochondrion , biology , endocrinology , medicine , respiratory system , intracellular , microbiology and biotechnology , enzyme , protoporphyrin , biochemistry , heme , porphyrin
Mitochondrial dysfunction might play a role in the pathogenesis of liver damage in erythropoietic protoporphyria (EPP). Changes in mitochondrial respiratory chain activities were evaluated in the Fech m1pas /Fech m1pas mouse model for EPP. Mice from different strains congenic for the same ferrochelatase germline mutation manifest variable degrees of hepatobiliary injury. Protoporphyric animals bred into the C57BL/6J background showed a higher degree of hepatomegaly and liver damage as well as higher protoporphyrin (PP) accumulation than those bred into the SJL/J and BALB/cJ backgrounds. Whereas mitochondrial respiratory chain activities remained unchanged in the liver of protoporphyric mice C57BL/6J, they were increased in protoporphyric mice from both SJL/J and BALB/cJ backgrounds, when compared to wild‐type animals. Mitochondrial respiratory chain activities were increased in Hep G2 cell line after accumulation of PP following addition of aminolevulinic acid. As a direct effect of these elevated mitochondrial activities, in both hepatic cells from mutant mouse strains and Hep G2 cells, adenosine 5′‐triphosphate (ATP) levels significantly increased as the intracellular PP concentration was reduced. These results indicate that PP modifies intracellular ATP requirements as well as hepatic mitochondrial respiratory chain enzymatic activities and further suggest that an increase of these activities may provide a certain degree of protection against liver damage in protoporphyric mice.