Age-related oxidative modifications of proteins and lipids in rat brain.
Oxidants have been shown to play a major role in ageing and ageing-related neurodegenerative diseases. In the present study, we investigated the effect of ageing on oxidative damage to lipids and proteins in brain homogenate, mitochondria and synaptosomes of adult (6-month-old), old (15-month-old), and senescent (26-month-old) Wistar rats. There was a significant increase in thiobarbituric acid-reactive substances and conjugated dienes in homogenates, which indicate increased lipid peroxidation (LPO). Oxidative modifications of homogenate proteins were demonstrated by a loss of sulfhydryl content, accumulation of dityrosines and formation of protein conjugates with LPO-end products. Increase in protein conjugates with LPO-end products and a decrease in SH groups were observed also in mitochondria and synaptosomes, but dityrosine content was elevated only in synaptosomes. Protein surface hydrophobicity, measured by fluorescent probe 1-anilino-8-naphthalenesulfonate (ANS), was increased only in homogenate. These results suggest that besides mitochondria and synaptosomes other cellular compartments are oxidatively modified during brain ageing.
Babusikova
E
E
Department of Medical Biochemistry, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovak Republic. babusikova@jfmed.uniba.sk
Hatok
J
J
Dobrota
D
D
Kaplan
P
P
D000375:Aging / Q000502:physiology*; D000818:Animals; D015227:Lipid Peroxidation; D008055:Lipids / Q000737:chemistry*; D008297:Male; D008928:Mitochondria / Q000378:metabolism; D016877:Oxidants / Q000737:chemistry* / Q000378:metabolism; D010084:Oxidation-Reduction; D011506:Proteins / Q000737:chemistry*; D051381:Rats; D017208:Rats, Wistar; D013050:Spectrometry, Fluorescence; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
D008055:Lipids; D016877:Oxidants; D011506:Proteins; D017392:Thiobarbituric Acid Reactive Substances