Mehmet Türkmen

Dokuz Eylul University, İzmir, Izmir, Turkey

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Publications (102)227.46 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Abstract Aim: To assess the relationship between mesangial hypercellularity in various childhood nephropathies and clinical and laboratory parameters. Methods and patients: The reports of the renal biopsies were evaluated retrospectively. The patients with diagnosis of IgA nephropathy (isolated and Henoch-Schönlein nephritis), IgM nephropathy, or isolated mesangial proliferative glomerulonephritis were included. Each nephropathy group was divided into two subgroups according to the severity of mesangial hypercellularity as mild and severe. The biochemical data and histopathological findings of the patients were recorded. Results: When the groups were compared, it was found that the patients with IgA nephropathy had hematuria (p = 0.043) and the patients with IgM nephropathy had nephrotic syndrome more frequently than the other patients (p = 0.01). No difference was detected between the groups regarding the severity of mesangial hypercellularity. On the other hand, when the groups were evaluated within themselves, no significant association was detected between the severity of mesangial hypercellularity and clinical and laboratory parameters. It was determined that the renal biopsy was performed earlier in patients with Henoch-Schönlein nephritis compared to the other cases (p = 0.004). Compared to the isolated IgA nephropathy group, it was found that the number of cases with severe mesangial hypercellularity was higher and the level of proteinuria was more prominent in patients with Henoch-Schönlein nephritis. Additionally, when the patients with Henoch-Schönlein nephritis were evaluated, the degree of proteinuria was found to be higher in patients with severe mesangial hypercellularity compared to those of showing mild mesangial hypercellularity (p = 0.002). Conclusion: It was observed that there is no direct relation between the severity of mesangial hypercellularity and clinical and laboratory findings in various childhood nephropathies. However, when Henoch-Schönlein nephritis is compared with IgA nephropathy, it was found that the severity of mesangial hypercellularity was higher in cases with Henoch-Schönlein nephritis and the level of proteinuria was more prominent in those cases. However, no difference was detected in glomerular filtration rates and biochemical data with regard to the level of mesangial hypercellularity.
    Renal Failure 03/2014; · 0.94 Impact Factor
  • Urology 11/2013; 82(5):1190-1. · 2.42 Impact Factor
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    ABSTRACT: Abstract We aimed to investigate the underlying mechanisms responsible for the renoprotective effects of pentoxifylline (PTX) in gentamicin (GEN)-induced nephropathy. On this purpose, 26 female Wistar rats (200-250 g) were included and four groups were formed. The first one was the control group (n:5). The rats in other groups (n:7 for each) received 50 mg/kg twice daily intraperitoneal (i.p.) PTX, 100 mg/kg i.p. GEN and both GEN and PTX at the same doses for consecutive 8 days, respectively. Rats were weighed both at the beginning and end of the study. After the last dose, 24-hour urines were collected and the rats were sacrificed. Blood samples and kidney tissues were obtained for biochemical, histological, oxidative stress, and apoptotic parameters. Body weights were similar in all groups at the beginning of the study. Rats in GEN group had significant weight loss, tubular damage, and increased apoptosis, while GEN + PTX group had significantly better outcomes. Scr, urinary protein/creatinine, and TBARS levels were significantly higher and Ccr and SOD levels were significantly lower in GEN and GEN + PTX groups in comparison to control and PTX groups, but the levels were similar between GEN and GEN + PTX groups. In conclusion, concomitant administration of PTX provides renoprotection via suppressing apoptosis in GEN-induced nephropathy.
    Renal Failure 09/2013; · 0.94 Impact Factor
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    ABSTRACT: OBJECTIVE: To evaluate the clinical properties of patients with nutcracker syndrome (NCS). MATERIALS AND METHODS: The medical records of the patients with NCS were retrospectively investigated, and the patients' sex, age, presenting symptoms, urinalysis findings, associated diseases, and body mass indexes were recorded. RESULTS: A total of 23 nonconsanguineous patients (11 male and 12 female patients, mean age 141 ± 36 months). Two patients had posterior NCS. Seventeen patients presented with 1 or >1 symptom. Fatigue and lassitude (n = 1), flank pain (n = 8), abdominal pain (n = 7), varicocele (n = 2), and macroscopic hematuria (n = 9) were the presenting symptoms. Only 6 patients had received a diagnosis of NCS from the urinalysis findings, which revealed microscopic hematuria or non-nephrotic proteinuria. The urinalysis findings disclosed isolated proteinuria in 6, hematuria plus proteinuria in 8, and macroscopic hematuria in 9 patients. Orthostatic proteinuria was detected in 7 patients. In patients with regressed hematuria and proteinuria, the body mass index was markedly increased at the end of the follow-up period relative to at diagnosis (at diagnosis 16.9 ± 4.0 kg/m(2); at the end of the follow-up period 18.6 ± 4.6 kg/m(2); P = .028). CONCLUSION: The diagnosis of NCS should be considered in the presence of symptoms such as proteinuria and hematuria and should be absolutely ruled out before attempting renal biopsy. An apparent correlation between an increased body mass index and regression of symptoms was seen.
    Urology 06/2013; · 2.42 Impact Factor
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    ABSTRACT: OBJECTIVE: To evaluate the factors associated with compensatory hypertrophy in the functional kidneys of children. METHODS: The medical files of patients with a solitary functional kidney were reviewed retrospectively. Data regarding anthropometric measurements, functional renal length, functional renal length of standard deviation score (SDS) of functional kidney at diagnosis, and end of follow-up were obtained. Patients were divided into 2 groups, those with a unilateral kidney function of <10% (hypoplasia, dysplasia, and atrophy, group 1) and those with a solitary kidney (agenesis, and multicystic dysplastic kidney, group 2). RESULTS: A total of 126 patients (70 boys) were evaluated. Both the sizes of the functional kidney and functional kidney SDS values at diagnosis were greater in group 1 relative to group 2. At the end of the follow-up period, anthropometric values including functional kidney size were higher in group 2. Functional kidney size of 2 SDS above the normal was mostly predictive at age 17.5 months (odds ratio [OR] 5.06) and at a body height of 82 cm (OR 5.57). CONCLUSION: The most determining factors for renal length SDS values were age and height. Solitary kidneys complete compensatory hypertrophy by 17.5 months of age, and after that their growth continues in parallel to normal growth.
    Urology 05/2013; · 2.42 Impact Factor
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    ABSTRACT: OBJECTIVE: To evaluate the efficiency of mesenchymal stem cells in ameliorating renal scarring in a rat pyelonephritis model. METHODS: Three groups each, including 8 Sprague-Dawley rats were formed: Group 1 = sham operated (4 were given mesenchymal stem cells); group 2 = pyelonephritis induced by Escherichia coli; and group 3 = pyelonephritis and mesenchymal stem cells. Rats not given mesenchymal stem cells in group 1 and 4 rats in groups 2 and 3 were sacrificed on the eighth day for evaluation of inflammation, and the remaining rats were sacrificed at the sixth week to determine renal scarring along with migration of mesenchymal stem cells to renal tubules and differentiation to tubular cells expressing aquaporin-1. RESULTS: Rats in group 3 had lower scores of both acute (8th day) and chronic (6th week) histopathological alterations compared with rats in group 2. By contrast, although rats in group 3 were shown to have mesenchymal stem cells expressing aquaporin-1 in their renal tubules, these cells were not detected in kidney tissue of mesenchymal stem cells-treated sham rats. CONCLUSION: These results indicate that mesenchymal stem cells migrated to renal tissues and ameliorated renal scarring in this rat model of pyelonephritis.
    Urology 08/2012; · 2.42 Impact Factor
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    ABSTRACT: Squamous metaplasia is a proliferative lesion characterized by the replacement of the transitional epithelium with stratified squamous cells. In the urinary system, it is mostly seen in the bladder. It can be nonkeratinized or keratinized. We report the cases of 2 adolescent girls with keratinizing metaplasia, 1 of whom presented with difficulty with indwelling catheterization and 1 with final terminal hematuria. The predisposing factors were recurrent urinary tract infection and additional catheterization in 1 of the patients. The diagnosis was confirmed by histologic examination in both patients. We report on these cases to draw attention to this rare entity in children.
    Urology 05/2012; 80(1):207-9. · 2.42 Impact Factor
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    ABSTRACT: One of the complex upper urinary tract anomalies is a duplicated collecting system. In cases with a functioning upper moiety, ureteroureterostomy (UU) is the preferred operation to redirect the urine to the normal collecting system. Although open UU is a well-described operation, experience with laparoscopic repair pediatric patients is scarce. We describe the successful application of laparoscopic UU in 2 children and suggest that laparoscopic UU for the duplicated collecting system is a promising minimally invasive procedure.
    Journal of Pediatric Surgery 04/2012; 47(4):e27-30. · 1.38 Impact Factor
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    ABSTRACT: Secondary pseudohypoaldosteronism type 1 develops due to transient aldosterone resistance in renal tubules and is characterized by renal sodium loss, hyponatremia, hyperkalemia and high plasma aldosterone levels. Although many reasons are described, urinary tract infections and/or urinary tract anomalies are the most common causes. Although the cause of the tubular resistance is not known exactly, renal scar development due to obstruction and reduced sensitivity of mineralocorticoid receptors due to cytokines such as transforming growth factor (TGF)-beta are the possible mechanisms. It is seen especially within the first three months of life and the frequency decreases with age. The treatment is usually elimination of the underlying cause. In this article, we present four patients with several urinary tract anomalies and concomitant urinary tract infection who developed transient secondary pseudohypoaldosteronism.
    The Turkish journal of pediatrics 01/2012; 54(1):67-70. · 0.56 Impact Factor
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    ABSTRACT: KeywordsIatrogenic phospoholipidosis–Trimethoprim–sulphamethoxazole–Zebra body–Fabry disease
    Pediatric Nephrology 10/2011; · 2.94 Impact Factor
  • Pediatric Nephrology 10/2011; 27(5):761-2, 763-4. · 2.94 Impact Factor
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    ABSTRACT: Amyloidosis is the major complication of familial Mediterranean fever (FMF). Toll-like receptors (TLR) are involved in the activation of an innate immune system TLR-2 and TLR-4 recognize lipoteichoic acid and lipopolysaccharides (LPS), respectively. While TLR-2 Arg753Gln polymorphism upregulates, TLR-4 Asp299Gly and Thre399Ile polymorphisms downregulate inflammation. We investigated the effect of these polymorphisms on the development of amyloidosis in FMF patients. We also investigated myeloid cell TLR-2 and TLR-4 expressions in these patients. We studied 26 FMF patients and 13 FMF patients with amyloidosis. TLR-2 Arg753Gln and TLR-4 Asp299Gly and Thr399Ile polymorphisms were analyzed with the polymerase chain reaction-restriction fragment length polymorphism method. Myeloid cell baseline TLR-2 and TLR-4 and LPS-induced TLR-4 expressions were evaluated. The TLR-2 and TLR-4 polymorphism rate was compared with the results of 100 healthy subjects in our previous study. In addition, 13 healthy controls were enrolled for leukocyte TLR-2 and TLR-4 expressions. Serum amyloid A (SAA) levels were measured in these 13 control cases and in FMF patients during attack-free periods. The frequency of TLR-2 Arg753Gln, TLR-4 Asp299Gly, and Thr399Ile polymorphisms in healthy controls in our previous study were 1%, 3%, and 2%, respectively. The frequency of these polymorphisms were not different in FMF patients (with or without amyloidosis) compared to the control group. Likewise, myeloid cell TLR-2 and TLR-4 expressions were not different among the controls and FMF patients. However, LPS-induced TLR-4 expression in granulocytes was more prominent in FMF patients. There was no correlation between TLR-2 and TLR-4 expressions and SAA levels. Neither myeloid cell TLR-2 and TLR-4 expressions nor TLR-2 Arg753Gln, TLR-4 Asp299Gly, and Thr399Ile polymorphisms seem to affect the development of secondary amyloidosis in FMF patients in our study population.
    Inflammation 10/2011; 34(5):379-87. · 2.46 Impact Factor
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    ABSTRACT: Lactococcus lactis cremoris infections are very rare in humans. It is recognized as a commensal organism of mucocutaneous surfaces of cattle, and is occasionally isolated from human mucocutaneous surfaces. We report a brain abscess caused by L. lactis cremoris in an immunocompetent child. A 19-month-old female patient was admitted with fever and vomiting. Brain computed tomography (CT) revealed brain abscess. L. lactis cremoris was isolated from culture of the abscess material. The patient was treated with pus drainage from brain abscess and antibiotics including vancomycin and meropenem. The patient recovered completely. To our knowledge, this is the first report of a L. lactis cremoris infection in children.
    European Journal of Pediatrics 09/2011; 170(12):1603-5. · 1.91 Impact Factor
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    ABSTRACT: Herein the results of a multicenter study from the Turkish Pediatric Kidney Transplantation Study Group are reported. The aims of this study were to compare the quality of life (QoL) scores of Turkish children who are dialysis patients (DP), renal transplant recipients (TR), and age-matched healthy controls and to compare child-self and parent-proxy scores. The Turkish versions of the Kinder Lebensqualität Fragebogen (KINDL(R)) questionnaires were used as a QoL measure. The study group consisted of 211 children and adolescents with chronic kidney disease (CKD) (139 TR and 72 DP aged between 4-18 years; 13.7 +/- 3.5 years) from 11 university hospitals, 129 parents of these patients, 232 age-matched healthy children and adolescents (aged between 4-18 years; 13.1+/-3.5 years) and 156 of their parents. Patients with CKD had lower scores in all subscales except for physical well-being than those in the control group. TR had higher scores in physical well-being, self-esteem, friends' subscales, and total scores than DP. Child-self scores were lower than parent-proxy scores, especially in CKD, DP, and control groups. Concordance between parent-proxy and child-self reports in the TR, DP, CKD, and control groups was only moderate for the majority of subscales (r = 0.41-0.61). It was concluded that parent-proxy scores on the QoL were not equivalent to child-self scores and that evaluating both children's and parents' perspectives were important. Additionally, psychosocial counseling is crucial not only for patients with CKD but also for their parents.
    Pediatric Nephrology 04/2010; 25(8):1487-96. · 2.94 Impact Factor
  • Pakize Karakaya, Uluç Yiş, Semra Hz Kurul, Mehmet Atilla Türkmen
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    ABSTRACT: Children with autism often display difficult behaviors including tantrums, extreme irritability, and physical aggression. There is emerging evidence that olanzapine is useful in decreasing these disruptive behaviors. The most common adverse effects are weight gain and short-term sedation. On the other hand, olanzapine rarely causes rhabdomyolysis. We report a case with rhabdomyolysis in an autistic child just after 2 doses of olanzapine treatment. Initial creatine kinase value was 30,690 IU/L (range, 5-130 U/L), and rhabdomyolysis resolved with hydration and alkalinization over 7 days. Monitoring serum creatine kinase levels may be useful in pediatric cases after initiation of olanzapine treatment.
    Pediatric emergency care 01/2010; 26(1):41-2. · 0.92 Impact Factor
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    ABSTRACT: The diagnosis of chyloperitoneum (CP) is based on the presence of high levels of triglycerides (TGs) in the dialysate. It is a rare complication of peritoneal dialysis (PD) and even rarer in neonates. We report here the case of CP in a 1700-g male baby delivered at the 30th gestational week due to posterior urethral valve and associated oligohydramnios. On postnatal day 2, the serum creatinine (Scr) was 1.6 mg/dL, and he was anuric. PD was instituted via a Tenckhoff catheter. At the end of the second week, after the initiation of enteral feeding, the ultrafiltrate became cloudy, with a leukocyte count of 900/mm(3). A treatment regimen consisting of intraperitoneal vancomycin and ceftazidime was then started. Five days later, the fluid became milky, with a TG level of 251 mg/dL. The patient was then placed on a diet based on medium-chain triglycerides and octreotide (1 microg/kg/h; increasing up to 2 microg/kg/h over 15 days). Although the TG and leukocyte levels decreased, the milky appearance persisted. PD was stopped for 2 days when the Scr decreased to 1.7 mg/dL. When it was resumed, the fluid was totally clear, with a TG level of 7 mg/dL. The infant was discharged with a nightly intermittent peritoneal dialysis program and has had no recurrence. In summary, we report a preterm infant who developed CP during PD and recovered following treatment that included diet modification, octreotide, and temporary discontinuation of the PD.
    Pediatric Nephrology 11/2009; 25(2):363-6. · 2.94 Impact Factor
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    ABSTRACT: Infections may trigger or aggravate glomerulonephritidis and renal vasculitis like Henoch Schonlein purpura (HSP). HSP is seen more frequently in patients with familial Mediterranean fever in which TLR-2 Arg753Gln polymorphism frequency is increased. Although renal involvement is the most important factor affecting the prognosis in HSP, it is not known which patients will have renal disease or why some patients have severe renal involvement while some others have mild renal disease. We investigated the role of TLR-2 and TLR-4 polymorphisms on the incidence and severity of renal involvement in HSP patients. We studied HSP patients with and without nephritis (n = 15 for each group) and healthy controls (n = 100). TLR-2 Arg753Gln and TLR-4 Asp299Gly/Thr399Ile polymorphisms were analyzed with polymerase chain reaction-restriction fragment length polymorphism method. The frequency of TLR-2 Arg753Gln, TLR-4 Asp299Gly, and Thr399Ile polymorphisms in healthy controls were 1, 3, and 2%, respectively. The frequencies of these polymorphisms were not different in HSP patients with or without nephritis compared to healthy controls. TLR-2 Arg753Gln, TLR-4 Asp299Gly, and Thr399Ile polymorphisms are not increased in HSP or HSP nephritis patients.
    Rheumatology International 08/2009; 30(5):667-70. · 2.21 Impact Factor
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    ABSTRACT: Linear scleroderma is the most common type of juvenile localized scleroderma, which usually involves the limbs. The linear lesions may extend through the dermis, subcutaneous tissue, muscles, and the underlying bone, leading to significant functional and cosmetic deformities. Renal involvement in juvenile localized scleroderma is a rare manifestation. Here we report two cases with juvenile linear scleroderma and unique renal manifestations, including unilateral renal arterial stenosis and immunoglobulin M nephropathy.
    Pediatric Nephrology 06/2009; 24(10):2041-5. · 2.94 Impact Factor
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    ABSTRACT: A 16-year-old boy presented with acute kidney injury (AKI) which was attributed to chronic heavy cola consumption. Habitual heavy cola ingestion might lead to hypokalemic rhabdomyolysis by its glycyrrhizin content. AKI has been described rarely in association with this clinical picture. It is important for physicians to keep heavy cola and other soft drink consumption in mind as a cause for hypokalemic rhabdomyolysis and AKI.
    European Journal of Pediatrics 04/2009; 169(1):107-11. · 1.91 Impact Factor
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    ABSTRACT: Familial Mediterranean fever (FMF) is an autosomal recessive disorder characterized by recurrent attacks of fever and polyserositis. It is the most frequent periodic fever syndrome. In FMF, sterile peritonitis, pleuritis and arthritis are frequently seen in addition to recurrent febrile attacks. Skin and muscle involvement is less common. Here, we report four patients presented with skin lesions or myalgia. Most striking findings in those patients are the absence of other major criteria for FMF and dominancy of skin lesions or myalgia. All four patients had MEFV gene mutations on both alleles. In patients with erysipelas-like lesions or erythema nodosum along with arthritis/arthralgia or recurrent myalgia, FMF should be kept in mind.
    Clinical Rheumatology 03/2009; 28(7):857-60. · 2.04 Impact Factor

Publication Stats

353 Citations
227.46 Total Impact Points

Institutions

  • 1995–2013
    • Dokuz Eylul University
      • • Faculty of Medicine
      • • Department of Pediatrics
      İzmir, Izmir, Turkey
  • 2003
    • Yuzuncu Yil University
      • Faculty of Medicine
      Van, Van, Turkey
  • 1997
    • Necmettin Erbakan Üniversitesi
      Conia, Konya, Turkey