Yazar "Aydogdu N." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    The comparison of endothelial function of moderate intensity interval exercise with continuous exercise in healthy men
    (Elsevier B.V., 2022) Meri?c B.; Solak S.; Aydogdu N.; Sut N.; Vardar S.A.
    Background/aim: Exercise enhances endothelium-dependent vasodilation; however, it is unclear whether intermittent exercise has a different effect on vascular endothelial function compared to continuous exercise. This study aimed to compare vascular endothelial function following intermittent exercise including short rest intervals with continuous exercise, both at the anaerobic threshold level. Materials and methods: Peak oxygen consumption (VO2 peak) and anaerobic threshold were measured in physically active healthy young men (n = 12) by breath-by-breath analysis. After completion of intermittent exercise consisting of eight 1-min long intervals at the anaerobic threshold intensity with 75-s rest periods, total work was calculated. Equivalent work was done during continuous exercise. Immediately after the two exercise periods, venous blood lactate, endothelial nitric oxide synthase (eNOS), endothelin-1, N-terminal proANP (NTproANP), N-terminal proBNP (NTproBNP), and N-terminal proCNP (NTproCNP) levels were measured. Brachial artery flow-mediated dilatation (FMD) was measured before exercise and 30 min after exercise. Results: Mean VO2 peak level was 33.42 ± 5.9 ml/min/kg and anaerobic threshold level was 47.33 ± 5.85%. Lactate levels following continuous exercise were higher than levels following intermittent exercise (27.76 ± 7.43 mg/dl, 18.54 ± 4.87 mg/dl respectively; p?0.05). Endothelin-1, eNOS, NTproANP, NTproBNP, and NTproCNP levels were similar after both modalities of exercise (p > 0.05). No significant difference was found in FMD response when comparing intermittent and continuous exercise (7.05 ± 15.11%, 2.49 ± 16.24% respectively; p > 0.05). Conclusion: Since blood lactate levels are higher following continuous exercise, individuals who find difficulty exercising may prefer an intermittent form of exercise. However, both intermittent and continuous exercise at the anaerobic threshold level seem to not produce a significant acute change in endothelial function in healthy men. © 2022
  • Küçük Resim Yok
    Öğe
    Effects of curcumin on arginase enzyme activity, ornithine and nitric oxide levels in experimental breast cancer model
    (Ondokuz Mayis Universitesi, 2022) Kahraman E.K.; Aydogdu N.; Erbas H.
    Breast cancer accounts for almost 30% of all cancer types, making it the most common type of tumor among women in the world. Arginase, an essential enzyme of the urea cycle, leads to the formation of urea and ornithine from L-arginine using the same substrate as nitric oxide synthase (NOS). Arginase has been reported to be higher in cancer patients and can be used as a useful biomarker. In this study, we aimed to investigate the effects of curcumin, an anticarcinogenic agent, on arginase enzyme activity, ornithine, and nitric oxide (NO) levels in experimental breast cancer model in mice. 43 male Balb/c mice were used, and Erhlich acid tumor model was created in the study. Mice were divided into five groups as healthy control group, curcumin treatment before tumor formation, curcumin treatment after tumor formation and cancer control groups. 100 mg/kg curcumin were given orally. Serum and tissue arginase enzyme activities, NO levels and tissue ornithine levels were determined spectrophotometrically. Increased serum arginase activity decreased with curcumin treatment, but this difference was not statistically significant. On the other hand, decreased NO levels were increased with curcumin treatment. In tumor tissue, arginase activity and ornithine levels decreased significantly with curcumin treatment and tissue NO levels increased significantly with curcumin treatment. In our study, we show that curcumin may have a protective effect on the development of breast cancer by inhibiting arginase enzyme activity and ornithine levels, which are the precursors of polyamines, as well as inducing NO production via NOS. As a promising anticancer agent, the net effects of curcumin in this mechanism should be supported by more advanced studies and new parameters. © 2022 Ondokuz Mayis Universitesi. All rights reserved.