In:
American Journal of Physiology-Cell Physiology, American Physiological Society, Vol. 293, No. 1 ( 2007-07), p. C22-C29
Abstract:
Malfunction of NADH:ubiquinone oxidoreductase or complex I (CI), the first and largest complex of the mitochondrial oxidative phosphorylation system, has been implicated in a wide variety of human disorders. To demonstrate a quantitative relationship between CI amount and activity and mitochondrial shape and cellular reactive oxygen species (ROS) levels, we recently combined native electrophoresis and confocal and video microscopy of dermal fibroblasts of healthy control subjects and children with isolated CI deficiency. Individual mitochondria appeared fragmented and/or less branched in patient fibroblasts with a severely reduced CI amount and activity (class I), whereas patient cells in which these latter parameters were only moderately reduced displayed a normal mitochondrial morphology (class II). Moreover, cellular ROS levels were significantly more increased in class I compared with class II cells. We propose a mechanism in which a mutation-induced decrease in the cellular amount and activity of CI leads to enhanced ROS levels, which, in turn, induce mitochondrial fragmentation when not appropriately counterbalanced by the cell's antioxidant defense systems.
Type of Medium:
Online Resource
ISSN:
0363-6143
,
1522-1563
DOI:
10.1152/ajpcell.00194.2006
Language:
English
Publisher:
American Physiological Society
Publication Date:
2007
detail.hit.zdb_id:
1477334-X
SSG:
12
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