Journal
TOXICOLOGY IN VITRO
Volume 26, Issue 7, Pages 1181-1190Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tiv.2012.06.010
Keywords
Antioxidant; Free radical; High glucose; Leukocyte; Glycation; Methylglyoxal; Carotenoid
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [FAPESP 09/14382-7, 09/17381-1]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (Bolsa Produtividade em Pesquisa, Nivel, CNPq, Brazil) [312190/2009-3]
- Universidade Cruzeiro do Sul
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [09/17381-1] Funding Source: FAPESP
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The purpose of the present study was to find out whether co-treatment of human neutrophils with high glucose and methylglyoxal (MGO) can alter the biochemical parameters of human neutrophils. We also examined if astaxanthin associated with vitamin C can improve those biochemical parameters. Neutrophils from healthy subjects were treated with 20 mM of glucose and 30 mu M MGO followed or not by the addition of the antioxidants astaxanthin (2 mu M) and vitamin C (100 mu M). MGO/high glucose treatment reduced the phagocytic capacity and the G6PDH, total/SOD and GR activities. Additionally, there was an increase in the activity of myeloperoxidase (MPO) with consequent increase in the hypochlorous acid production, CAT activity and in the release of IL-6 cytokine without changes in intracellular calcium mobilization. Our study also shows that the association of astaxanthin with vitamin C greatly improved neutrophil phagocytic capacity, decreasing all reactive oxygen species measured, pro-inflammatory IL-1 beta and TNF-alpha release, MPO activity and HCIO production. The combination of astaxanthin with vitamin C alone has more antioxidant and anti-inflammatory effects than when they were in the presence of MGO/high glucose. Injury to the function of neutrophils due to high glucose and methylglyoxal appears not to involve oxidative stress or calcium release. The association of antioxidants astaxanthin and vitamin C promoted a significant improvement in the function of neutrophils and in the redox status. (C) 2012 Elsevier Ltd. All rights reserved.
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