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001-es BibID:	BIBFORM051960
Első szerző:	Bolisetty, Subhashini
Cím:	Mitochondria-targeted heme oxygenase-1 decreases oxidative stress in renal epithelial cells / Subhashini Bolisetty, Amie Traylor, Abolfazl Zarjou, Michelle S. Johnson, Gloria A. Benavides, Karina Ricart, Ravindra Boddu, Ray D. Moore, Aimee Landar, Stephen Barnes, Victor Darley-Usmar, Anupam Agarwal
Dátum:	2013
ISSN:	1931-857X 1522-1466
Megjegyzések:	Mitochondria are both a source and target of the actions of reactive oxygen species and possess a complex system of inter-related antioxidants that control redox signaling and protect against oxidative stress. Interestingly, the antioxidant enzyme heme oxygenase-1 (HO-1) is not present in the mitochondria despite the fact that the organelle is the site of heme synthesis and contains multiple heme proteins. Detoxification of heme is an important protective mechanism since the reaction of heme with hydrogen peroxide generates pro-oxidant ferryl species capable of propagating oxidative stress and ultimately cell death. We therefore hypothesized that a mitochondrially localized HO-1 would be cytoprotective. To test this, we generated a mitochondria-targeted HO-1 cell line by transfecting HEK293 cells with a plasmid construct containing the manganese superoxide dismutase mitochondria leader sequence fused to HO-1 cDNA (Mito-HO-1). Nontargeted HO-1-overexpressing cells were generated by transfecting HO-1 cDNA (HO-1) or empty vector (Vector). Mitochondrial localization of HO-1 with increased HO activity in the mitochondrial fraction of Mito-HO-1 cells was observed, but a significant decrease in the expression of heme-containing proteins occurred in these cells. Both cytosolic HO-1- and Mito-HO-1-expressing cells were protected against hypoxia-dependent cell death and loss of mitochondrial membrane potential, but these effects were more pronounced with Mito-HO-1. Furthermore, decrement in production of tricarboxylic acid cycle intermediates following hypoxia was significantly mitigated in Mito-HO-1 cells. These data suggest that specific mitochondrially targeted HO-1 under acute pathological conditions may have beneficial effects, but the selective advantage of long-term expression is constrained by a negative impact on the synthesis of heme-containing mitochondrial proteins.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	American Journal of Physiology. Renal Physiology. - 305 : 3 (2013), p. F255-F264. -
További szerzők:	Traylor, Amie Zarjou, Abolfazl (1979-) (kutató orvos) Johnson, Michelle S. Benavides, Gloria A. Ricart, Karina Boddu, Ravindra Moore, Ray D. Landar, Aimee Barnes, Stephen Darley-Usmar, Victor Agarwal, Anupam
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