Person:
DAĞLI, EMRULLAH TOLGA

Profile Picture

Email Address

Birth Date

Research Projects

Organizational Units

OrgUnit Logo
Organizational Unit

Job Title

Last Name

DAĞLI

First Name

EMRULLAH TOLGA

Name

Filters

1998 - 199912000 - 20041
Reset filters

Settings

Subject: nitric oxide ×

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    PublicationMetadata only
    Oxygen radicals and nitric oxide in rat mesenteric ischaemia-reperfusion: Modulation by L-arginine and N-G-nitro-L-arginine methyl ester
    (WILEY, 1998) YALÇIN, AHMET SUHA; Haklar, G; Ulukaya-Durakbasa, C; Yuksel, M; Dagli, T; Yalcin, AS
    1. The aims of the present study were to detect changes in superoxide anion (O-2(.-)), nitric oxide (NO) and other reactive oxygen species (ROS) directly by measurement of chemiluminescence (CL) and to investigate the role of L-arginine, a nitric oxide synthase (NOS) substrate, and N-G-nitro-L-arginine methyl ester (L-NAME), a NOS inhibitor, together with their molecular enantiomers D-arginine and D-NAME, in a rat mesenteric ischaemia-reperfusion (I/R) model. 2, Seventy-nine female Wistar albino rats were divided into eight groups, The first three groups underwent sham operation; group 1 was the control group, group 2 received L-arginine and group 3 received L-NAME. Ischaemia was produced in the remaining five groups by ligation of the superior mesenteric artery for 30 min followed by 60 min reperfusion, Group 4 rats were control I/R rats and groups 5-8 received either L-arginine, L-NAME, D-arginine or D-NAME, respectively. 3, Both luminol and lucigenin CL was significantly increased in I/R groups compared with sham-operated groups. L-Arginine significantly reduced CL measurements. D-Arginine was also protective, but not as much as L-arginine. Both L- and D-arginine had in vitro O-2(.-)-scavenging potential, as tested by the xanthine-xanthine oxidase system. N-G-Nitro-L-arginine methyl ester decreased lipid peroxidation values in addition to reducing CL measurements. Nitric oxide concentrations were significantly increased in VR groups in comparison with sham-operated groups. Peroxynitrite formation was increased by I/R. Treatment with L-NAME was beneficial by reducing NO concentrations in the reperfused ileum, 4, In our I/R model, O-2(.-), NO and other ROS were increased. Although NOS inhibitors were effective in reducing oxidative damage, increasing NO concentrations with L-arginine was also beneficial, presumably due to the ability of L-arginine to inhibit phagocyte adherence and its radical scavenging potential. In fact, NO may have different effects in terms of tissue injury or protection depending on the concentration of oxygen and the haemodynamic state of the tissue.
  • No Thumbnail Available
    PublicationMetadata only
    The roles of free oxygen radicals, nitric oxide, and endothelin in caustic injury of rat esophagus
    (W B SAUNDERS CO-ELSEVIER INC, 2004) DAĞLI, EMRULLAH TOLGA; Ozel, SK; Dagli, TE; Yuksel, M; Kiyan, G; Kotiloglu, E
    Purpose: The authors aimed to find out the roles of free oxygen radicals, nitric oxide (NO), and endothelin (ET) in caustic injury of rat esophagus. Methods: Forty-five Wistar albino rats were used to form 6 groups. The study groups are summarized as 1, sham (S; n = 7); 2, sham + L-arginine (SA; n 7); 3, sham + L-NAME (SN; n = 7); 4, injury (I; n = 8); 5, injury + L-arginine (IA; n = 8); 6, injury + L-NAME (IN; n = 8). Normal saline in the sham groups and 50% NaOH in the caustic injury groups were administered to the distal esophagus. Free oxygen radicals and NO were detected by chemiluminescence from tissue samples, and they were correlated with histologic examinations. Tissue ET was measured also with immunohistochemistry. Results: The injury was verified histologically. Free oxygen radical levels were found to be increased as well as NO and ET with the caustic injury (P < .05). L-arginine caused a histologic increase in the injury that was close to statistical significance (P = .08). L-NAME showed no significant effect. Conclusions: Free radicals, NO, and ET increase in the early phase of caustic esophageal injury. Understanding their early interactions during the caustic injury may help in future therapeutic strategies. (C) 2004 Elsevier Inc. All rights reserved.