Endogenous catechol thioethers may be pro-oxidant or antioxidant.
Endogenous catechol thioethers may be pro-oxidant or antioxidant.
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内源性儿茶酚硫醚可以是促氧化剂或抗氧化剂。
DOI:
10.1016/s0891-5849(99)00043-x
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发表时间:
1999
影响因子:
7.4
通讯作者:
Montine,TJ
中科院分区:
文献类型:
--
作者:
Picklo,MJ;Amarnath,V;Graham,DG;Montine,TJ
Increased catechol thioether formation is associated with Parkinson’s disease. In this study, we examined whether catechol thioethers, having a lower oxidation potential than their parent catechols, would cause greater oxidative damage than their parent catechols. We synthesized 5′-S-glutathionyl, cysteinyl, and N-acetylcysteinyl derivatives of dopamine and dopac, encompassing the known catechol thioethers of the mercapturate pathway. Cyclic voltametry studies showed that catechol thioethers had higher reduction potentials than their parent catechols. A higher reduction potential did not correlate with an increase in oxidative damage, measured by metal-catalyzed DNA strand breakage. 5′-S-Glutathionyldopamine and the cysteinyl adducts of dopamine and dopac mediated less oxidative damage than their parent catechols. In contrast, both N-acetylcysteinyl analogs were equipotent to dopamine. Oxygen consumption corresponded to DNA damage except for 5′-S-glutathionyldopamine. The glutathionyl and cysteinyl adducts of dopamine inhibited dopamine-mediated DNA damage indicating that these adducts may have antioxidant properties. 5′-S-Glutathionyldopamine potentiated H2O2-mediated damage whereas 5-S-cysteinyldopamine was inhibitory. Our results show that the ability of catechol thioethers to cause oxidative damage in vitro is not based simply upon the reduction potential but rather, reflects a complex relationship among structures of the parent catechol and thiol adduct, metal catalyst, and oxidant.
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影响因子:
7.3
作者:
Fa Zhang;G. Dryhurst
通讯作者:
G. Dryhurst
影响因子:
3.9
作者:
Kalyanaraman,B;Korytowski,W;Pilas,B;Sarna,T;Land,EJ;Truscott,TG
通讯作者:
Truscott,TG
影响因子:
11.2
作者:
HIRSCH, EC
通讯作者:
HIRSCH, EC
影响因子:
3.8
作者:
Montine,TJ;Underhill,TM;Linney,E;Graham,DG
通讯作者:
Graham,DG
影响因子:
4.1
作者:
Y. Yoshie;H. Ohshima
通讯作者:
H. Ohshima