Mitochondrial dysfunction via disruption of complex II activity during iron chelation-induced senescence-like growth arrest of Chang cells.

Abstract:

:When cells are deprived of iron, their growth is invariably inhibited. However, the mechanism involved remains largely unclear. Recently, we have reported that subcytotoxic concentration of deferoxamine mesylate (DFO), an iron chelator, specifically inhibited transition of Chang cell, a normal hepatocyte cell line, from G1 to S phase, which was accompanied by irreversible appearance of senescent biomarkers. To investigate factors responsible for the irreversible arrest, we examined mitochondrial activities because they require several irons for their proper structure and function. After exposure to 1 M DFO, total cellular ATP level was irreversibly decreased with concurrent disruption of mitochondrial membrane potential (DeltaPsim), implying that it might be one of the crucial factors involved in the arrest. DFO did not directly inhibit the mitochondrial respiratory activities in vitro. Among the respiratory activities, complex II activity was specifically inhibited through a down-regulation of the expression of its iron-sulfur subunit. We also observed that mitochondrial morphology was drastically changed to highly elongated form. Our results suggest that mitochondrial function is sensitive to cellular iron level and iron deprivation might be involved in inducing the senescent arrest. In addition, complex II, which is a part of both oxidative phosphorylation and the Krebs cycle, could be one of the critical factors that regulate mitochondrial function by responding to iron levels.

journal_name

Ann N Y Acad Sci

authors

Yoon YS,Cho H,Lee JH,Yoon G

doi

10.1007/978-3-662-41088-2_13

subject

Has Abstract

pub_date

2004-04-01 00:00:00

pages

123-32

eissn

0077-8923

issn

1749-6632

journal_volume

1011

pub_type

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