RELATIONSHIP BETWEEN AGE AND GSH METABOLISM IN SYNAPTOSOMES OF RAT CEREBRAL-CORTEX

被引:20
作者
FAVILLI, F [1 ]
IANTOMASI, T [1 ]
MARRACCINI, P [1 ]
STIO, M [1 ]
LUNGHI, B [1 ]
TREVES, C [1 ]
VINCENZINI, MT [1 ]
机构
[1] UNIV FLORENCE,DEPT BIOCHEM SCI,I-50134 FLORENCE,ITALY
关键词
GLUTATHIONE-METABOLISM; AGE; SYNAPTOSOMES;
D O I
10.1016/0197-4580(94)90074-4
中图分类号
R592 [老年病学]; C [社会科学总论];
学科分类号
03 ; 0303 ; 100203 ;
摘要
A comprehensive analysis on glutathione metabolism in rat cerebral cortex synaptosomes as a function of age was performed. All different glutathione system components (GSH, GSSG, total GSH, and GSH redox index) changed significantly only during aging. GSH, total GSH, and GSH redox index decreased by about 40%, 24%, and 52%, respectively, while GSSG showed a remarkable increase of about 60%. On the contrary, some GSH-related enzyme activities showed characteristic changes both during growth and aging. GSH peroxidase and GSH-S-transferase activities significantly increased both during growth and aging, GSH reductase and gamma-glutamylcysteine synthetase activities showed lower levels only during aging, while glucose-6-phosphate dehydrogenase activity did not change throughout the life of the rat. The results obtained suggest an increase of the oxidative status due to a reduced antioxidant capacity of the GSH system in the synaptosomal compartment during aging. The main cause of these metabolic modifications is a lowering of the rates of both GSSG reduction to GSH and GSH synthesis. Moreover, an irreversible loss of GSH as GSH-S-conjugates due to a high detoxification mechanism during aging is also possible. These alterations in glutathione metabolism, found mainly during aging in rat cerebral cortex synaptosomes may contribute to clarify some aspects of cerebral diseases.
引用
收藏
页码:429 / 433
页数:5
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