Document Detail

The nitrative and oxidative stress in blood platelets isolated from breast cancer patients: the protectory action of aronia melanocarpa extract.
MedLine Citation:
PMID:  20624007     Owner:  NLM     Status:  In-Process    
Since mechanisms involved in the relationship between oxidative stress and breast cancer are still unclear, the aim of our present study was to evaluate oxidative/nitrative modifications of blood platelet proteins by measuring the level of biomarkers of oxidative/nitrative stress such as carbonyl groups, thiol groups and 3-nitrotyrosine in proteins in patients with benign breast diseases and in patients with invasive breast cancer, and compare with the control group. Levels of carbonyl groups and 3-nitrotyrosine residues in platelet proteins were measured by ELISA and a competition ELISA, respectively. The method with 5,5′-dithio-bis(2-nitro-benzoic acid) has been used to analyse free thiol groups in platelet proteins. Patients were hospitalized in the Department of Oncological Surgery, Medical University of Lodz, Poland. Exogenous antioxidants reduce oxidative stress, therefore we also investigated in a model system in vitro the effects of a polyphenol rich extract of Aronia melanocarpa (Rosaceae, final concentration of 50 µg/ml, 5 min, 37°C) on modified blood platelet proteins as well from patients with breast cancer and from the healthy group. We demonstrated in platelet proteins from patients with invasive breast cancer a higher level of carbonyl groups than in the control healthy group (p < 0.02). The level of 3-nitrotyrosine in platelet proteins from patients with invasive breast cancer was also significantly higher than in the healthy subject group (p < 0.001). In contrast, the amount of thiol groups in platelet proteins from patients was significantly lower (about < 50%) than in control blood platelets. In a model system in vitro we also observed that the extract from berries of A. melanocarpa (50 µg/ml, 5 min, 37°C) due to antioxidant action, significantly reduced the oxidative/nitrative stress (measured by thiol groups and 3-nitrotyrosine) in platelets, not only from the healthy group, but also from patients with benign breast diseases and in patients with invasive breast cancer.
Magdalena Kedzierska; Beata Olas; Barbara Wachowicz; Anna Stochmal; Wieslaw Oleszek; Arkadiusz Jeziorski; Janusz Piekarski
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Platelets     Volume:  21     ISSN:  1369-1635     ISO Abbreviation:  Platelets     Publication Date:  2010  
Date Detail:
Created Date:  2010-10-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9208117     Medline TA:  Platelets     Country:  England    
Other Details:
Languages:  eng     Pagination:  541-8     Citation Subset:  IM    
Department of General Biochemistry, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland.
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