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Zischka, H. ; Lichtmannegger, J. ; Schmitt, S. ; Jägemann, N. ; Schulz, S. ; Wartini, D. ; Jennen, L. ; Rust, C.* ; Larochette, N.* ; Galluzzi, L.* ; Chajes, V.* ; Bandow, N.* ; Gilles, V.S.* ; DiSpirito, A.A.* ; Esposito, I.* ; Göttlicher, M. ; Summer, K.H. ; Kroemer, G.*

Liver mitochondrial membrane crosslinking and destruction in a rat model of Wilson disease.

J. Clin. Invest. 121, 1508-1518 (2011)
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Wilson disease (WD) is a rare hereditary condition that is caused by a genetic defect in the copper-transporting ATPase ATP7B that results in hepatic copper accumulation and lethal liver failure. The present study focuses on the structural mitochondrial alterations that precede clinical symptoms in the livers of rats lacking Atp7b, an animal model for WD. Liver mitochondria from these Atp7b–/– rats contained enlarged cristae and widened intermembrane spaces, which coincided with a massive mitochondrial accumulation of copper. These changes, however, preceded detectable deficits in oxidative phosphorylation and biochemical signs of oxidative damage, suggesting that the ultrastructural modifications were not the result of oxidative stress imposed by copper- dependent Fenton chemistry. In a cell-free system containing a reducing dithiol agent, isolated mitochondria exposed to copper underwent modifications that were closely related to those observed in vivo. In this cell-free system, copper induced thiol modifications of three abundant mitochondrial membrane proteins, and this correlated with reversible intramitochondrial membrane crosslinking, which was also observed in liver mitochondria from Atp7b–/– rats. In vivo, copper-chelating agents reversed mitochondrial accumulation of copper, as well as signs of intra-mitochondrial membrane crosslinking, thereby preserving the functional and structural integrity of mitochondria. Together, these findings suggest that the mitochondrion constitutes a pivotal target of copper in WD.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Copper transporting atpase; Evans cinnamon rats; Cell-death; Oxidative stress; permeability transition; Superoxide-dismutase; Catalyzed oxidation; Polyacrylamide-gels; Oxidant injury; Oral therapy
ISSN (print) / ISBN 0021-9738
e-ISSN 1558-8238
Quellenangaben Band: 121, Heft: 4, Seiten: 1508-1518 Artikelnummer: , Supplement: ,
Verlag American Society of Clinical Investigation
Begutachtungsstatus Peer reviewed