Increased oxidative/nitrosative stress and decreased antioxidant enzyme activities in prostate cancer

Objectives: The study was aimed to evaluate the oxidative/nitrosative stress status in prostate cancer (CaP) and benign prostatic hyperplasia (BPH). Design and methods: 312 men from two different populations were included: 163 men from Macedonia (73 Cap patients, 67 BPH patients and 23 control 'subjects) and 149 men from Turkey (34 prostate cancer patients, 100 BPH patients and 15 control Subjects). We measured erythrocyte malondialdehyde (MDA) levels, erythrocyte activities of superoxide dismutase (CuZn-SOD), glutathione peroxidase (GPX) and catalase (CAT); plasma nitrite/nitrate (NO2-/NO3-, cGMP and 8-hydroxy-2'-deoxyguanosine (8-OHdG) levels. Results: A similar pattern of alteration in the oxidative/nitrosative stress-related parameters was found in both, Macedonian and Turkish studied samples: higher MDA concentrations with lower GPX and CuZn-SOD activities in Cap patients versus controls and BPH groups. The CAT activity was decreased in the CaP patients versus controls in the Turkish studied sample. Furthermore, CaP patients had increased plasma NO2-/NO3- and cGMP levels versus controls and BPH groups in both studied samples. Conclusions: This study has confirmed an imbalance in the oxidative stress/antioxidant status and revealed an altered nitrosative status in prostate cancer patients. (C) 2009 The Canadian Society of Clinical Chemists. Published by Elsevier Inc. All rights reserved.