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Biomedical subjects

A Bedir

Publications and source records attributed to A Bedir.

15 recordsLinked to original sources
PubMed2001

The interaction between copper and coronary risk indicators.

We studied the effects of external copper exposure on plasma copper, serum lipids, lipoproteins and apolipoproteins in workers who have excessive contact with copper. Fifty-eight healthy Turkish males who were working in the copper processing industry and 33 control subjects were examined. Copper concentration was measured by flame atomic absorption spectrometry, lipid and lipoprotein levels were detected by spectrophotometry and apolipoproteins were measured with a nephelometer. There was no significant difference in plasma copper between the workers and the controls. However, in the worker group, the mean levels of TC, LDL-C, apoAI, apoB and Lp (a) were significantly higher while the mean level of HDL-C was significantly lower than that of the controls. In addition, there was a significant positive correlation between plasma copper and LDL-C only in the workers group. Our findings suggest that excessive contact with copper may contribute to coronary risk factors.

Adult↗
PubMed2000

Effect of vitamin E and pentoxifylline on glycerol-induced acute renal failure.

The pathogenesis of acute renal failure may involve, among other causes, ischemia, vascular congestion, arachidonic acid pathways, and reactive oxygen metabolites. The aim of this study is to evaluate the effects of pentoxifylline and vitamin E on the prevention of experimental acute renal failure induced by glycerol. Eighty-five Sprague-Dawley rats weighing 170-230 g were included in the study. The rats were randomly divided into four groups: group 1 was given 1 ml saline; group 2, glycerol; group 3, glycerol plus vitamin E, and group 4, glycerol plus pentoxifylline. Extent of histological renal tubular necrosis and regeneration in each animal were graded. Blood urea nitrogen, serum creatinine, and creatine kinase concentrations were measured. Mean blood urea nitrogen and serum creatinine concentrations and tubular injury scores were significantly lower in group 1 than in groups 2-4 (p < 0.001), but there were no significant differences among groups 2-4. We conclude that postinsult administration of vitamin E and pentoxifylline does not have a beneficial effect on prevention and severity of acute renal failure and that controlled, multicenter studies involving a large number of patients are needed to clarify this subject.

Acute Kidney Injury↗
PubMed1999

Angiotensin converting enzyme gene polymorphism and activity in Turkish patients with essential hypertension.

Studies in various ethnic groups have shown contradictory evidence on the association of the angiotensin converting enzyme (ACE) insertion/ deletion (I/D) polymorphism with essential hypertension. We conducted a case-control study in Samsun, Turkey, to examine the association between ACE genotype, ACE serum activity, and blood pressure. Serum ACE activity was measured and ACE I/D polymorphism performed in 165 hypertensive and 143 normotensive subjects. Genomic DNA was extracted from blood samples and amplified by polymerase chain reaction (PCR). PCR primers were flanking the polymorphic region in intron 16 of the ACE gene. The distribution of the DD, ID, and II ACE genotypes was 65, 77, and 23 in hypertensive patients and 42, 82, and 19 in normotensive subjects (P > .05). The estimated frequency of the insertion allele was 0.37 in hypertensive and 0.42 in normotensive subjects. Nevertheless, sensitivity analysis, based on positive family history and severity of hypertension, suggested that significant associations existed between more homogeneous groups of hypertensives and normotensives (P < .05). ACE genotype influenced ACE activity and the highest level was in DD genotype, being the lowest in II genotype. ACE serum levels were significantly higher in hypertensives as compared with normotensives (P < .01). A modest correlation was observed between blood pressure and ACE among hypertensive persons (r = 0.25, P < .05) and this did persist in multivariate analysis (P < .05 for systolic blood pressure and P < .005 for diastolic blood pressure). These data suggest that ACE DD genotype may have predisposing effects on severe hypertensives and cases with positive family history, and that ACE may be one of the independent factors on hypertension.

Adult↗
PubMed1999

The levels of lipids, lipoproteins and apolipoproteins in healthy people in the central region of the Black Sea.

Lipids, lipoproteins and apolipoproteins are among the risk factors for the most serious health problem of the age--coronary artery disease (CAD). They vary from country to country, from area to area within a country, depending on genetic, environmental, dietary and many other factors. Our aim was to determine the levels of lipids, lipoproteins and apolipoproteins in healthy people in the central Black Sea region of Turkey. Subjects included 1348 volunteers (682 women, 666 men) referred to the Medical Faculty hospital from the study area. The population consisted of healthy people or those whose disease was not affecting the metabolism of lipids. Cholesterol, triglyceride and HDL-cholesterol levels in the obtained serum samples were measured spectrophotometrically, while apolipoprotein A-I, apolipoprotein B, apolipoprotein E and lipoprotein(a) levels were measured nephelometrically. The levels of lipid parameters were as follows: total cholesterol for men was 4.22 +/- 1.00 mmol/l (mean arithmetic +/- SD), triglyceride 1.20 mmol/l (0.30-4.44) [geometric mean (range)], HDL-cholesterol 0.88 +/- 0.22 mmol/l, LDL-cholesterol 2.69 +/- 0.85 mmol/l, apolipoprotein A-I 1.26 +/- 0.22 mmol/l apolipoprotein B 1.12 +/- 0.32 mmol/l, apolipoprotein E 0.037 +/- 0.012 mmol/l and lipoprotein(a) 0.25 g/l (0.03-2.75); total cholesterol for women was 4.53 +/- 1.00 mmol/l, triglyceride 1.05 mmol/l (0.28-4.50), HDL-cholesterol 1.08 +/- 0.26 mmol/l, LDL-cholesterol 2.87 +/- 0.88 mmol/l, apolipoprotein A-I 1.45 +/- 0.25 mmol/l, apolipoprotein B 1.11 +/- 0.31 mmol/l, apolipoprotein E 0.039 +/- 0.011 mmol/l and lipoprotein(a) 0.22 g/l (0.03 2.16). In conclusion, our study in four different regions in Turkey reflected that the people living in the central Black Sea region are less vulnerable to the risk of CAD, although at a relatively higher risk compared to some other countries.

Adolescent↗
PubMed1998

Low prevalence of hepatitis G virus antibodies in glomerular diseases.

A possible agent for human non-A-E hepatitis has been identified and named hepatitis G virus (HGV). HGV is also a flavivirus, and the clinical characteristics and risk factors of HGV infection may be similar to those of hepatitis C virus infection. Hepatitis C virus infection may manifest as a primary glomerulonephritis. The aim of this study is to evaluate the prevalence of serum HGV RNA in 98 adult patients with biopsy-proven glomerular diseases. We found that only 3 patients (3%) out of 98 with primary glomerulonephritis had HGV RNA. One of 59 (1.7%) healthy controls was serum HGV RNA positive (p > 0.05). The prevalence of serum HGV RNA was low in the patients with primary glomerulonephritis.

Adult↗
PubMed1998

Plasma Atrial Natriuretic Peptide Levels in Preeclampsia and Eclampsia

> Objective: There is a reduction in intravascular volume in patients with preeclampsia and eclampsia. Since the secretion of atrial natriuretic peptide (ANP) by human atrial myocytes is stimulated by increased intraatrial pressure or atrial distention, we sought to determine whether circulating maternal plasma ANP concentrations were lower in patients with severe preeclampsia and eclampsia compared with normal pregnant women. Methods: Fifteen patients with mild preeclampsia, 15 with severe preeclampsia, 15 with eclampsia, and 38 normotensive pregnant women were taken as the control group. All the women were age-matched and in their third trimester. The level of ANP in these patients was measured during the third trimester and in the postpartum period by a specific radioimmunoassay. At the same time, routine laboratory tests for eclampsia and preeclampsia such as uric acid, creatinine, and urine protein levels were obtained. Results: ANP levels were significantly higher in the antepartum periods in women with mild preeclampsia (20.7 +/- 6), severe preeclampsia (28.9 +/- 9), and eclampsia (26.6 +/- 6.5) than those in normotensive pregnant women (15.7 +/- 3.5; P < 0.05 and P < 0.001, respectively). As the severity of preeclampsia increased, the mean values of ANP became higher. Conclusions: ANP levels in preeclamptic and eclamptic women were found to be higher than those in normotensive pregnant women. There is a correlation between the severity of toxemia and plasma ANP levels. The mechanism(s) responsible for the elevation requires further investigation.

Journal Article↗
PubMed1996

Urinary leucine aminopeptidase is a more sensitive indicator of early renal damage in non-insulin-dependent diabetics than microalbuminuria.

We measured urinary activity of leucine aminopeptidase (EC 3.4.11.2) and creatinine concentrations (Cr, in mmol) in samples of second morning urine from 25 healthy subjects and 59 non-insulin-dependent diabetic (NIDD) subjects. If NIDD subjects are grouped according to their Alb/Cr ratio into normoalbuminuria (group A, Alb/Cr < 2.8 mg/mmol), microalbuminuria (group B, Alb/Cr 2.8-26.8 mg/mmol), and macroalbuminuria (group C, Alb/Cr > 26.8 mg/mmol), LAP/Cr ratios in all three groups exceeded those for healthy age-matched controls. Moreover, this ratio was higher in group B than in group A. The value for LAP/Cr was clearly abnormal (i.e., exceeded the upper limit of normal, log normal + 2 SD, found in healthy subjects) in 44% of group A. In the first 10-year period Of NIDD, prevalance of abnormal LAP/Cr ratio was 61.3%, whereas that of microalbuminuria was 35.5%. We have also found a LAP/Cr ratio abnormality of 91% in group B. Evidently, LAP/Cr may be increased early in NIDD subjects and be a more sensitive predictor of incipient nephropathy than microalbuminuria.

Adult↗
PubMedDate not supplied

Prevalence of serum HGV-RNA among hemodialysis patients in Turkey.

A possible agent for human non-A-E hepatitis has been identified and named hepatitis G virus (HGV). The aim of this study is to evaluate the prevalence of serum HGV-RNA among hemodialysis patients in our country and the possible correlations of serum HGV-RNA with antibody to hepatitis C virus (anti-HCV), chronic liver dysfunction, number of blood transfusions, serum hepatitis B surface antigen (HBs Ag), duration of hemodialysis therapy, history of renal transplantation and patients' age and sex. Seventy-eight hemodialysis patients and 59 healthy controls were included in the study. Twenty-seven of 78 hemodialysis patients (34.6%) and two of the 59 healthy controls were serum HGV-RNA positive (p < 0.01, x2 = 17.8). There was no significant difference between the HGV-RNA positive and HGV-RNA negative groups regarding mean duration of dialysis therapy, anti-HCV, chronic liver dysfunction, number of blood transfusions, serum HBs Ag, duration of hemodialysis therapy, history of renal transplantation and patients' age and sex. In conclusion, hemodialysis patients carry the risk for HGV infection and transmission routes and clinical significance of HGV infection in these patients remain to be defined.

Adolescent↗
PubMedDate not supplied

Somatic angiotensin converting enzyme in varicocele.

The ACE is found as two isozymes in the body. A somatic isozyme found in blood and several other tissues, and a testis-specific isozyme found only in developing spermatids and mature sperm. In this study, we investigated the ACE activity in left spermatic vein blood samples of infertile patients with varicocele and its correlation to spermatologic parameters. The somatic ACE activities were determined in the peripheral and left spermatic vein blood samples from 31 infertile patients who underwent variococelectomy, and 11 fertile control subjects underwent left inguinal herniorraphy. The somatic ACE activity was measured by kinetic spectrophotometric assay. Semen analyses were performed according to WHO guidelines. The mean somatic ACE activities of peripheral and left spermatic veins of the varicocele group were 60.3 +/- 23.0 and 60.2 +/- 23.2 U/L, respectively. In control group, peripheral and left spermatic vein ACE activities were found as 56.8 +/- 17.1 and 56.5 +/- 15.5 U/L, respectively. There was no significant difference between the ACE activity in peripheral and left spermatic vein blood sample from the varicocele and control group. There was no statistically significant correlation between the spermatologic parameters and ACE activities in the spermatic and peripheral vein in both of varicocele and control groups. As a result, it may be suggested that the somatic ACE has no causative role in pathophysiology of varicocele and varicocele related infertility.

Follicle Stimulating Hormone↗
PubMedDate not supplied

Acute effect of trandolapril on serum erythropoietin in uremic and hypertensive patients.

Anemia associated with ACE inhibitors is rare but it may cause problems especially in patients with renal disease. This study assessed the acute effect of trandolapril, an ACE inhibitor, on serum erythropoietin (EPO) levels in uremic and hypertensive patients. Trandolapril 2 mg/day was given orally for three days and blood samples were collected on the first and third day. Trandolapril led to a significant decrease in serum EPO in patients with chronic renal failure. Although the drug lowered serum EPO in hypertensive patients, this effect was not statistically significant. This drop in serum EPO levels may be one of the mechanisms by which ACE inhibitors cause anemia, or worsen anemia, in uremic patients and further studies are needed to clarify this point.

Adult↗