Advanced Glycation End Products, Oxidative Stress and Metalloproteinases are altered in the Cerebral Microvasculature during Aging

Title: Advanced Glycation End Products, Oxidative Stress and Metalloproteinases are altered in the Cerebral Microvasculature during Aging

Volume: 4 Issue: 4

Author(s): Florentina Safciuc, Alina Constantin, Adrian Manea, Manuela Nicolae, Doina Popov, Monica Raicu, Dorin Alexandru and Elena Constantinescu

Affiliation:

Keywords: Brain aging, microvessels, oxidative stress, protein carbonyls, antioxidant enzymes, metalloproteinases

Abstract: Biological aging is associated with an increased incidence of cerebrovascular disease. Recent findings indicate that oxidative stress promoting age-related changes of cerebral circulation are involved in neurodegenerative disorders such as Alzheimers disease (AD) and Parkinsons disease. The aim of this study was to evaluate the contribution of cerebral microvessels to the oxidative stress during brain aging, by: (i) assessment of precursors for advanced glycation end products (AGE) formation, (ii) activities of antioxidant enzymes, namely superoxide dismutase (SOD), glutathione peroxidase (GPx) and glutathione disulfide reductase (GR), and (iii) the activities of metalloproteinases (MMPs), MMP-2 and MMP-9, involved in synaptogenesis and memory consolidation. The experiments were performed on two groups of male Wistar rats: 15 young (3-6 months old) and 15 aged (18-24 months old) animals. The cerebral microvessels were isolated by mechanical homogenization, the concentration of protein carbonyls and the activity of antioxidant enzymes were evaluated by spectrophotometry, and gelatin SDS-PAGE zymography was employed to evaluate MMP-2 and MMP-9 activities. The results showed that, by comparison with young rats, aged brain microvessels contain: (i) ∼ 106 % increase of protein carbonyls production; (ii) ∼ 68% higher GPx activity, unmodified activities of SOD and GR; (iii) ∼ 30% diminishment in MMP-2 activity, and the specific occurrence of MMP-9 enzyme. The data suggest that the age-related changes of microvessels could increase the propensity for cerebral diseases and might represent, at least in part, a prerequisite for the deterioration of mental and physical status in the elderly.

Cite this article as:

Safciuc Florentina, Constantin Alina, Manea Adrian, Nicolae Manuela, Popov Doina, Raicu Monica, Alexandru Dorin and Constantinescu Elena, Advanced Glycation End Products, Oxidative Stress and Metalloproteinases are altered in the Cerebral Microvasculature during Aging, Current Neurovascular Research 2007; 4 (4) . https://dx.doi.org/10.2174/156720207782446351