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001-es BibID:	BIBFORM047651
Első szerző:	Hajas György (biológus)
Cím:	8-Oxoguanine DNA glycosylase-1 links DNA repair to cellular signaling via the activation of the small GTPase Rac1 / Gyorgy Hajas, Attila Bacsi, Leopoldo Aguilera-Aguirre, Muralidhar L. Hegde, K. Hazra Tapas, Sanjiv Sur, Zsolt Radak, Xueqing Ba, Istvan Boldogh
Dátum:	2013
ISSN:	0891-5849
Megjegyzések:	8-Oxo-7,8-dihydroguanine (8-oxoG) is one of the most abundant DNA base lesions induced by reactive oxygen species (ROS). Accumulation of 8-oxoG in the mammalian genome is considered a marker of oxidative stress, to be causally linked to inflammation, and is thought to contribute to aging processes and various aging-related diseases. Unexpectedly, mice that lack 8-oxoguanine DNA glycosylase-1 (OGG1) activity and accumulate 8-oxoG in their genome have a normal phenotype and longevity; in fact, they show increased resistance to both inflammation and oxidative stress. OGG1 excises and generates free 8-oxoG base during DNA base-excision repair (BER) processes. In the present study, we report that in the presence of the 8-oxoG base, OGG1 physically interacts with guanine nucleotide-free and GDP-bound Rac1 protein. This interaction results in rapid GDP?GTP, but not GTP?GDP, exchange in vitro. Importantly, a rise in the intracellular 8-oxoG base levels increases the proportion of GTP-bound Rac1. In turn Rac1-GTP mediates an increase in ROS levels via nuclear membrane-associated NADPH oxidase type 4. These results show a novel mechanism by which OGG1 in complex with 8-oxoG is linked to redox signaling and cellular responses.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban 8-Oxoguanine DNA glycosylase-1 8-Oxoguanine Rac1 GTPase
Megjelenés:	Free Radical Biology And Medicine. - 61C (2013), p. 384-394. -
További szerzők:	Bácsi Attila (1967-) (immunológus) Aguilera-Aguirre, Leopoldo Hegde, Muralidhar L. Tapas, K. Hazra Sur, Sanjiv Radák Zsolt Ba, Xueqing Boldogh István
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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