Browsing by Author "Kaya, Mehmet Cemal"

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Antioxidant Status and Dna Damage in Children With Attention Deficit Hyperactivity Disorder With or Without Comorbid Disruptive Behavioral Disorders
(Kure Iletisim Grubu A S, 2016) Simsek, Seref; Gencoglan, Salih; Ozaner, Soner; Kaplan, Ibrahim; Kaya, Mehmet Cemal
Objective: The aim of this study is to investigate oxidative stress and DNA damage among children with attention deficit hyperactivity disorder (ADHD) with or without disruptive behavioral disorders (DBD). Methods: A total of 49 treatment naive children (M/F: 40/9) who were diagnosed with ADHD according to the Diagnostic and Statistical Manual of Mental Disorders (DSM) IV criteria were included. The patients with ADHD were divided into two groups, those with ADHD alone (n= 25) and ADHD plus DBD (n= 24). The control group consisted of 40 age-and sex-similar healthy children. The Schedule for Affective Disorders and Schizophrenia for School Aged Children-Present and Life-time version (K-SADS-PL) was applied to all children. Children's teachers completed the Turgay DSM-IV Based Child and Adolescent Behavior Disorders Screening and Rating Scale (T-DSM-IV-S). Serum glutathione peroxidase (GPx), coenzyme Q, 8-hydroxy-2-deoxyguanosine (8-OHdG) and superoxide dismutase (SOD) levels were measured by the ELISA method using commercial kits. Results: There were no significant differences in serum GPx, SOD, CoQ and 8-OHdG levels among the pure ADHD, ADHD plus DBD and the control groups (p>0.05). No statistically significant correlations were found between the severity of ADHD symptoms and GPx, SOD, CoQ and 8-OHdG levels. Conclusion: Our study suggests that oxidative stress may not play a key role in the pathogenesis of pure ADHD and ADHD plus DBD.
Decreased Prolidase Activity in Patients With Posttraumatic Stress Disorder
(Korean Neuropsychiatric Assoc, 2016) Demir, Suleyman; Bulut, Mahmut; Atli, Abdullah; Kaplan, Ibrahim; Kaya, Mehmet Cemal; Bez, Yasin; Sir, Aytekin
Objective Many neurochemical systems have been implicated in the development of Posttraumatic Stress Disorder (PTSD). The prolidase enzyme is a cytosolic exopeptidase that detaches proline or hydroxyproline from the carboxyl terminal position of dipeptides. Prolidase has important biological effects, and to date, its role in the etiology of PTSD has not been studied. In the present study, we aimed to evaluate prolidase activity in patients with PTSD. Methods The study group consisted of patients who were diagnosed with PTSD after the earthquake that occurred in the province of Van in Turkey in 2011 (n=25); the first control group consisted of patients who experienced the earthquake but did not show PTSD symptoms (n=26) and the second control group consisted of patients who have never been exposed to a traumatic event (n=25). Prolidase activities in the patients and the control groups were determined by the ELISA method using commercial kits. Results Prolidase activity in the patient group was significantly lower when compared to the control groups. Prolidase activity was also significantly lower in the traumatized healthy subjects compared to the other healthy group (p<0.01). Conclusion The findings of the present study suggest that the decrease in prolidase activity may have neuroprotective effects in patients with PTSD.