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J Hepatol. 2004 Apr;40(4):607-15.

Iron-induced mitochondrial permeability transition in cultured hepatocytes.

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  • 1Institut f├╝r Physiologische Chemie, Universit├Ątsklinikum, Hufelandstr. 55, D-45122 Essen, Germany. ursula.rauen@uni-essen.de

Abstract

BACKGROUND/AIMS:

We previously described that the cold-induced apoptosis of cultured hepatocytes and liver endothelial cells is mediated by an increase in the cellular chelatable iron pool-in the absence of any increase in O(2)(.-)/H(2)O(2) formation. As this is an unusual mechanism, we here set out to assess whether an increase in cellular chelatable iron per se is sufficient to trigger cell injury/apoptosis.

METHODS:

Cultured rat hepatocytes were acutely loaded with iron using the membrane-permeable complex Fe(III)/8-hydroxyquinoline and incubated under otherwise 'physiological' conditions.

RESULTS:

Incubation with Fe(III)/8-hydroxyquinoline (15 microM/30 microM) increased the cellular chelatable iron and induced strong hepatocellular injury with morphological features of apoptosis, but also of necrosis. The iron-induced cell injury was oxygen-dependent, and although it was not inhibitable by extracellular catalase, it was strongly inhibited by the novel membrane-permeable catalase mimic TAA-1/Fe. The experimentally induced increase in cellular chelatable iron triggered a mitochondrial permeability transition (MPT) as assessed using double-staining with calcein and tetramethylrhodamine methyl ester. The MPT inhibitor cyclosporine A partially and the well-known inhibitor combination trifluoperazine+fructose completely inhibited the iron-induced cell injury/apoptosis.

CONCLUSIONS:

These results show that iron per se can induce cell injury/apoptosis and that this injury is mediated via an MPT.

Comment in

PMID:
15030976
DOI:
10.1016/j.jhep.2003.12.021
[PubMed - indexed for MEDLINE]
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