Yazar "Kocaoglu, Ender Hilmi" seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • Küçük Resim Yok
    Öğe
    Effect of Static Magnetic Field on Oxidant/Antioxidant Parameters in Cancerous and Noncancerous Human Gastric Tissues
    (HINDAWI LTD, 2016) Ozturk, Bahadir; Durak, Zahide Esra; Buber, Suleyman; Kocaoglu, Ender Hilmi
    Aim. To investigate the effects of static magnetic field (SMF) on oxidant and antioxidant parameters of the cancerous and noncancerous human gastric tissues. Materials and Methods. Gastric tissues obtained from patients with gastric cancer were used in the study. SMF was created by using two static magnets. Before and after treatment with SMF, oxidant and antioxidant parameters were measured in the tissue samples. Results. In the cancerous tissue, superoxide dismutase (SOD) activity was found higher and malondialdehyde (MDA) level was found lower as compared with noncancerous tissue. SMF affects oxidant/antioxidant parameters differently in the cancerous and noncancerous tissues. In this regard, SMF causes increase in SOD activity and decrease in MDA level in the noncancerous tissue. However, it decreases SOD and glutathione peroxidase (GSH-Px) activities and increases MDA level and catalase (CAT) activity in the cancerous tissue. There were no differences between nitric oxide (NO) and nitric oxide synthase (NOS) parameters in or among the cancerous and noncancerous tissues. Conclusions. SMF accelerates peroxidation reactions possibly by suppressing SOD and GSH-Px enzymes in the cancerous gastric tissue. This event caused by SMF might play part in the death of cancer cells, which may be a good supportive vehicle for the cancer therapy.
  • Küçük Resim Yok
    Öğe
    Effects of aqueous extract from Silybum marianum on adenosine deaminase activity in cancerous and noncancerous human gastric and colon tissues
    (MEDKNOW PUBLICATIONS & MEDIA PVT LTD, 2015) Ozturk, Bahadir; Kocaoglu, Ender Hilmi; Durak, Zahide Esra
    Objective: Investigation of possible effects of Silybum marianum extract (SME) on adenosine deaminase (ADA) activity in cancerous and noncancerous human gastric and colon tissues to obtain information about possible mechanism of anticancer action of S. marianum. Materials and Methods: Cancerous and noncancerous human gastric and colon tissues removed from patients by surgical operations were used in the studies. The extract was prepared in distilled water. Before and after treatment with the extract, ADA activities in the samples were measured. Results: ADA activity was found to be lowered significantly in cancerous gastric tissues but not in noncancerous gastric tissues after treatment with the SME. In the colon tissues, ADA activities were however found to increase after the treatment of SME. Conclusion: Our results suggest that the aqueous extract from S. marianum inhibits ADA activity in cancerous gastric tissues significantly. It is suggested that in addition to other proposed mechanisms, accumulated adenosine due to the inhibition of ADA might also play a part in the anticancer properties of the S. marianum.
  • Küçük Resim Yok
    Öğe
    Static magnetic field inhibits 5 ' nucleotidase activity in cancerous and non-cancerous human gastric tissues
    (TAYLOR & FRANCIS INC, 2016) Durak, Zahide Esra; Buber, Suleyman; Kocaoglu, Ender Hilmi; Ozturk, Bahadir
    The aim of the present study is to investigate possible effects of static magnetic field (SMF) on 5 nucleotidase (5NT-CD73) and xanthine oxidase (XO) activities in cancerous and non-cancerous human gastric tissues in order to contribute to the elucidation of the anticancer activity of SMF. Cancerous and non-cancerous human gastric tissues removed from patients by surgical operations were used in the studies. SMF was created using two static magnets. Before and after treatment with SMF, 5NT and XO activities in the tissue samples were measured. 5NT activity was found to be lowered, but no significant change was observed in XO activity in the gastric tissues treated with the SMF. Our results suggest that SMF inhibits 5NT enzyme in gastric tissues significantly. It is supposed that in addition to other proposed mechanisms, inhibition of purine catabolic activity due to inhibition of some key enzymes in the DNA turn-over like 5NT might also play part in the anticancer activity of SMF.
  • Küçük Resim Yok
    Öğe
    Static Magnetic Field Inhibits Adenosine Deaminase Activity in Cancerous and Noncancerous Human Gastric Tissues
    (MARY ANN LIEBERT, INC, 2014) Durak, Zahide Esra; Kocaoglu, Ender Hilmi; Ozturk, Bahadir
    Aim: Investigation of possible effects of static magnetic field (SMF) on adenosine deaminase (ADA) activity in cancerous and noncancerous human gastric and colon tissues to obtain information about possible action mechanism of SMF. Materials and Methods: Cancerous and noncancerous human gastric and colon tissues removed from patients by surgical operations were used in the studies. SMF was created by using two static magnets. Before and after treatment with SMF, ADA activities in the tissue samples were measured. Results: The ADA activity was found to be lowered in gastric tissues treated with the SMF. However, no change was observed in the ADA activity of colon tissues. Conclusions: Our results suggest that SMF inhibits the ADA enzyme in gastric tissues significantly. It is supposed that, in addition to other proposed mechanisms, accumulated adenosine due to the inhibition of the ADA enzyme might also play a part in the anticancer activity of SMF.