Browsing by Subject "NEUROTROPHIC FACTOR LEVELS"

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    Correlation of serum BDNF levels with hippocampal volumes in first episode, medication-free depressed patients
    (SPRINGER HEIDELBERG) Eker, C; Kitis, O; Taneli, F; Eker, OD; Ozan, E; Yucel, K; Coburn, K; Gonul, AS
    The hippocampus seems to be affected in MDD, and brain-derived neurotrophic factor (BDNF) has positive effects on neurogenesis within the hippocampus. Although there are inconsistencies among study results, a smaller hippocampal volume in depressed patients is thought to be related to the pathophysiology of the disease. We looked at the correlation between serum BDNF (sBDNF) levels and hippocampal volumes (HCV) of first-episode MDD patients (18 female, 7 male; mean age = 32.1 +/- A 9.3) and healthy controls (17 female, 5 male; mean age = 29.7 +/- A 6.4). Region of interest analysis was conducted on the images acquired via MRI. sBDNF levels and HCV correlated only in the MDD group (right: r = 0.46, P = 0.02; left: r = 0.47, P = 0.02); however, HCV did not differ between MDD patients and healthy controls (right: F = 2.45, df = 1.46, P > 0.05; left: F = 0.05, df = 1.46, P > 0.05). BDNF may be a factor underlying HCV differences between MDD and healthy control subjects, which become apparent as severe and multiple episodes are experienced.
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    Chronic tinnitus and BDNF/GDNF CpG promoter methylations: a case-control study
    (SPRINGER) Orenay-Boyacioglu, S; Caliskan, M; Boyacioglu, O; Coskunoglu, A; Bozkurt, G; Cam, FS
    Brain-derived neurotrophic factor (BDNF) and Glial-derived neurotrophic factor (GDNF) are neurotrophic factors that play key roles in the auditory pathway. While the relationship between serum levels and polymorphisms of BDNF/GDNF and chronic tinnitus is emphasized in the literature, there is no study showing the link between the promoter methylations of these genes and tinnitus. For this purpose, the relationship between chronic tinnitus and peripheral blood derived BDNF/GDNF promoter methylations was investigated to identify their role in the pathophysiology of tinnitus. In this case-control study, we examined the possible effects of BDNF/GDNF methylations in the blood samples of patients with tinnitus complaints for more than 3months. Sixty tinnitus subjects between the ages of 18-55 and 50 healthy control subjects in the same age group who were free of any otorhinolaryngology and systemic disease were selected for examination. Methylation of total 12 CpG sites in BDNF and GDNF promoter regions were determined by the bisulfite-pyrosequencing method. Statistically significant differences were detected between BDNF CpG6 and GDNF CpG3-5-6 methylation ratios in the comparison of control group and the chronic tinnitus patients (P=0.002, 0.0005, 0.00003, and 0.0029, respectively). To our knowledge, this is the first study in the literature investigating the relationship between chronic tinnitus and peripheral blood derived BDNF/GDNF promoter methylations. It is believed that the current results might be supported by investigating the relationships between BDNF/GDNF methylations and genotypes in future research using higher sample sizes.
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    BDNF Measurement in Stress-Related Mood Disorders: A Review of Clinical Studies
    (TURKIYE SINIR VE RUH SAGLIGI DERNEGI) Aydemir, Ö; Deveci, A
    Objective: The study of brain-derived neurotrophic factor (BDNF) in mood disorders and other psychiatric disorders is increasing. Of particular interest is whether or not BDNF can be a marker for psychiatric disorders. The aim of this study was to review the published findings on BDNF in stress-related mood disorders. Method: Searches were conducted of the PubMed and Psikiyatri Dizini databases to access international and national publications, respectively. Database searches were conducted with the keywords BDNF and stress and mood disorders. Results: BDNF plays a role in the physiopathology of stress-related changes and is supposedly related to a decrease in the number and size of neurons, Additionally, it has been suggested that serum levels of BDNF are lower in depressive patients than in the healthy controls. Nonetheless, BDNF levels increase after antidepressant treatment, along with symptom recovery, to those seen in healthy control subjects. This increase cannot be achieved in patients that do not respond to antidepressant treatment. On the other hand, in patients with stress-related non-depressive psychiatric disorders, serum BDNF is also low. Conclusion: To date, even though consistent findings of reduced BDNF levels have been reported, the specificity of these findings is doubtful. Serum BDNF might be considered a marker for stress-related mood disorders.
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    Serum BDNF levels in suicide attempters related to psychosocial stressors: A comparative study with depression
    (KARGER) Deveci, A; Aydemir, O; Taskin, O; Taneli, F; Esen-Danaci, A
    Although many studies have examined the neurobiological aspects of suicide, the molecular mechanisms and pathophysiologic mechanisms associated with suicide remain unclear. In this study, it is aimed to investigate whether there is a difference in serum brain-derived neurotrophic factor ( BDNF) levels among suicide attempters without a major psychiatric disorder, compared to major depressive disorder patients and healthy subjects. It was undertaken with the hypothesis that suicide per se lowers serum BDNF levels, since it is a source of stress. The study was carried out in Celal Bayar University Hospital, Manisa, Turkey. Ten suicide attempters, 24 patients with major depressive disorder and 26 subjects without any psychiatric diagnosis and any psychiatric treatment were included in the study. All subjects were asked to give their written consent. Blood samples were collected at the baseline. Serum BDNF was kept at - 70 degrees C before testing, and assayed with an ELISA kit ( Promega; Madison, Wisc., USA) after dilution with the block and sample solution provided with the kit. The data were subjected to the Kruskal-Wallis test for nonparametric analysis of variance. Mean serum BDNF levels were significantly lower in the suicide group (21.2 +/- 12.4 ng/ml) and the major depressive disorder group (21.2 +/- 11.3 ng/ml) than the control group (31.4 +/- 8.8 ng/ml; p = 0.004). These results suggest that BDNF may play an important role in the neurobiology of suicidal behavior. BDNF levels may be a biological marker for suicidal behavior. To investigate the role of BDNF in suicide, further studies with a wider sample size and a variety of psychiatric diagnoses accompanying suicide attempt are needed. Copyright (c) 2007 S. Karger AG, Basel.