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    Cyclin-D1 protooncogen expression in prostate cancer
    (2000) Özbek E.; Mizrak B.; Özbek M.; Büyükberber S.; Davarci M.
    Cyclin D1, a cell cycle regulator essential for G1 phase progression, has been implicated in the pathogenesis of certain cancers. High levels of these proteins have been reported in certain human malignancies and have been implicated in aberrant cell division and dysregulated tumor growth. In this study, 30 prostate cancer and 25 benign prostate tissues were studied for cyclin D1 expression using an immunohistochemical technique. All of the primary prostate cancer samples revealed regions of moderate to strongly positive nuclear staining for cyclin D1, however there was no nuclear staining in the benign prostate tissue except-weak staining in the stroma. There was a positive correlation between Gleason grade and staining intensity for cyclin D1. The increased expression of cyclin D1 in prostate cancer samples suggests that further studies on the expression of this gene and related genes may be of interest in understanding the pathogenesis of prostate cancer. The positive correlation between Gleason grade and protein expression may be used as a prognostic marker in prostate cancer. Further studies are needed to confirm this suggestion.
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    The relationships between plasma and erythrocyte antioxidant enzymes and lipid peroxidation in patients with rheumatoid arthritis
    (Elsevier Masson SAS, 2001) Akyol Ö.; Işçi N.; Temel I.; Özgöçmen S.; Uz E.; Murat M.; Büyükberber S.
    Objective. The present study was undertaken to evaluate the activities of some key erythrocyte and plasma enzymes participating in free radical metabolism and the end product of lipid peroxidation in rheumatoid arthritis, and whether there are any differences for these parameters between newly diagnosed untreated patients and rheumatoid arthritis patients on drug therapy. Patients and methods. Superoxide dismutase and catalase activities, and malondialdehyde levels were determined in erythrocytes and plasma samples from 54 patients with rheumatoid arthritis (21 of whom without any treatment and 33 on classical therapy regimens) and from 33 healthy controls. Results. There were no statistically significant differences in mean values of activities of the erythrocyte enzymes between the patients and controls. Malondialdehyde levels were significantly increased in both newly diagnosed untreated patients and patients on drug therapy compared to control subjects. Malondialdehyde levels were lower in the treated group than the newly diagnosed untreated group (0.214 ± 0.111 ?mol/L and 0.388 ± 0.075 ?mol/L, respectively) (P < 0.0001). Mean plasma superoxide dismutase activity was lower in the group of newly diagnosed untreated patients compared to those of the treated and control groups (1.31 ± 0.069 U/mL, 1.79 ± 0.94 U/mL and 2.48 ± 0.94 U/mL, respectively) (P < 0.0001, untreated vs control groups). Conclusions. These results suggest sufficient antioxidant enzyme activities in erythrocytes in patients with rheumatoid arthritis and also increased lipid peroxidation end products in newly diagnosed untreated patients compared to control group and patients on drug therapy. © 2001 Éditions scientifiques et médicales Elsevier SAS.