Yazar "Kocyigit, Y" seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Platelet aggregation in type two diabetes mellitus and its relationship with lipoprotein levels(Faculty Press, 1998) Sermet, A; Kocyigit, Y; Atmaca, M; Kelle, M; Diken, HThe relationship between in vitro platelet aggregation and plasma lipoprotein concentrations, in 32 type hive non-insulin dependent diabetes mellitus (NIDDM) patients and 32 healthy subjects, was studied. An increase in the fasting plasma glucose and serum fructosamine concentrations in NIDDM patients was determined. No significant difference was found between platelet counts of the diabetic and control groups, but platelet aggregation induced by adenosine diphosphate (ADP), epinephrine and collagen were significantly higher than in healthy controls. Plasma total cholesterol, low density lipoprotein cholesterol (LDL-C) and triglyceride levels were significantly higher, and the plasma high density lipoprotein cholesterol (HDL-C) level was significantly lower than the controls. In vitro platelet aggregation induced by ADP, epinephrine and collagen correlated positively with LDL-C levels and the LDL-C/HDL-C ratio in both groups, and negatively with HDL-C levels in the diabetic group.Öğe Relationship among serum selenium levels, lipid peroxidation, and acute bronchiolitis in infancy(Humana Press Inc, 2004) Gurkan, F; Atamer, Y; Ece, A; Kocyigit, Y; Tuzun, H; Mete, MThirty-four infants with acute bronchiolitis and 25 age-matched healthy controls were enrolled to investigate the possible relationship between serum malondialdehyde (MDA) and selenium (Se) levels and the occurrence and severity of acute bronchiolitis in children. Serum samples were taken for serum Se and MDA measurements, and the clinical score was assessed at admission. Blood was taken again from the children with bronchiolitis at 2 mo after discharge from the hospital. Mean serum MDA levels were significantly higher in patients with acute bronchiolitis than at the postbronchiolitis stage and the controls (4.2+/-2.5 nmol/L, 1.4+/-0.8 nmol/L, and 0.7+/-0.2 nmol/L, respectively [p<0.001]). Infants with bronchiolitis had lower mean serum Se levels at the acute stage than after 2 mo (31.7+/-28.9 mug/L versus 68.4+/-26.4 mug/L, p<0.05, respectively); both of which were significantly lower than the control group measurements (145.0+/-21.9 mug/L) (p<0.001). There was a negative correlation between serum MDA and Se levels in the patient group (r=-0.85, p<0.001). The age of the patient, child's immunization status, parental smoking habit, and family crowding index were not correlated with serum Se, MDA levels, or clinical score at admission. In conclusion, increased MDA levels and impaired Se status demonstrate the presence of possible relationship of these parameters with pathogenesis of acute bronchiolitis, and antioxidant supplementation with Se might be thought to supply a beneficial effect against bronchiolitis.Öğe Serum leptin levels in asthmatic children treated with an inhaled corticosteroid(Amer Coll Allergy Asthma Immunology, 2004) Gurkan, F; Atamer, Y; Ece, A; Kocyigit, Y; Tuzun, H; Mete, NBackground: Recent observations suggest the presence of an interaction between leptin and the inflammatory system; however, there is no adequate knowledge about the role of leptin in atopic states such as asthma. Objectives: To evaluate the potential role of leptin in relation to bronchial asthma and inhaled corticosteroid therapy. Methods: Twenty-three children with mild-to-moderate, newly diagnosed asthma enrolled in this 2-period trial. The control group consisted of 20 age- and sex-matched children. Serum leptin levels were measured in patients at initiation and after 4 weeks of budesonide treatment and were compared with control group measurements. Results: Asthmatic children had higher mean +/- SD serum leptin levels at admission (19.3 +/- 5.1 ng/mL) than after budesonide treatment (10.6 +/- 1.6 ng/mL) and vs control group measurements (9.8 +/- 1.6 ng/mL) (P < .001). There was a significant correlation between serum leptin levels before and after budesonide treatment (r = 0.68; P = .007). Mean +/- SD body mass indices in patients and controls were 16.7 +/- 2.1 and 16.9 +/- 2.6 kg/m(2), respectively. Serum leptin levels did not correlate with body mass indices before budesonide treatment in the study group (r = -0.13; P = .65) but correlated well after budesonide treatment (r = 0.58; P = .009) and in the control group (r = 0.65; P = .008). Conclusions: The role of leptin elevation in children with asthma might be a regulatory mechanism rather than being etiologic, but a question may be raised whether it is possible that leptin may contribute to poor patient outcomes. Further research, both basic and clinical, is essential to explain the exact mechanism.Öğe Serum levels of leptin, insulin-like growth factor-I and insulin-like growth factor binding protein-3 in women with pre-eclampsia, and their relationship to insulin resistance(Parthenon Publishing Group, 2004) Kocyigit, Y; Bayhan, G; Atamer, A; Atamer, YThe present study was carried out to compare serum levels of leptin, insulin-like growth factor- I (IGF-I), insulin-like growth factor binding protein-3 (IGFBP-3), homeostasis model assessment-(pancreatic beta-cell function) (HOMA-(%B)) and homeostasis model assessment-(tissue insulin sensitivity) (HOMA-(%S)) in women with mild and severe pre-eclampsia and normotensive pregnant women; and to evaluate the possible relationships between these Parameters in the pathogenesis of pre-eclampsia. Seventy-three women were divided into three groups: group A consisted of 20 normotensive pregnant women (NPW); group B consisted of 25 women with mild pre-eclampsia (MPE); and group C consisted of 28 women with severe pre-eclampsia (SPE). Serum level of leptin was measured by enzyme immunoassay using a commercial kit. Serum levels of IGF-I and IGFBP-3 were measured with a two-site immunoradiometric assay. Serum level of insulin was measured by the electrochemiluminescence immunoassay method. HOMA used indices of pancreatic beta-cell function and tissue insulin sensitivity. Differences between groups were compared by one-way analyses of variance and the post hoc Tukey-HSD test fir multiple comparisons; however, when a variable was not normally distributed, the Mann-Whitney U test was used. Associations between variables were tested using Pearson's coefficient of correlation. Birth weight was significantly lower (p < 0.001) in the MPE and SPE groups than in the NPW group. Serum levels of leptin and insulin in women with SPE and MPE were significantly higher (p < 0.001) than in NPW. Serum levels of IGF-I and IGFBP-3 were significantly lower in women with SPE and MPE compared with NPW (p < 0.001). The mean HOMA- (%B) level in women with SPE and MPF was significantly higher than in NPW (p < 0.001), whereas the mean HOMA-(%S) level in women with SPE and MPF was significantly lower than in NPW (p < 0.001). In the SPE group, systolic blood pressure correlated significantly with serum levels of IGF-I and leptin (r = 0.375, p < 0.05 and r = 0.495, p < 0.01, respectively). A negative correlation between, mean HOMA-(%S) level and serum IGFBP-3 level was noted (r =-0.357, p < 0.05). There was a positive correlation between serum level of IGF-I and mean HOMA-(%B) level in mildly pre-eclamptic women (r = 0.541, p < 0.01). We conclude that pre-eclampsia is associated with insulin resistance; and that existing hyperinsulinemia and insulin resistance in women with pre-eclampsia seem not to correlate with leptin and birth weight, but may correlate positively with IGF-I and IGFBP-3. Therefore we think that hyperleptinemia, low IGF-I or IGFBP-3, and insulin resistance may contribute to the pathogenesis of pre-eclampsia.
