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Biomedical subjects

Hakan Erdem

Publications and source records attributed to Hakan Erdem.

At least 19 recordsLinked to original sources
PubMed2007

Serum proinflammatory cytokines directing T helper 1 polarization in patients with familial Mediterranean fever.

Th1 type polarization has been implicated in the pathogenesis of familial Mediterranean fever (FMF). Interleukin-12 (IL-12) and IL-10 are proinflammatory cytokines, which play crucial role in Th1 and Th2 type immune response, respectively. IL-18 has a dual effect on T cell response: it was recognized as an IFN-gamma-inducing factor in T cells; acting in synergy with IL-12, leading to the development of Th1 type immune responses. But, in the absence of IL-12, IL-18 can promote the production of Th2 cytokines and take part in allergic inflammation. The aim of this study is to measure serum levels of IL-10, IL-12, and IL-18 in patients with FMF, and to investigate the relationship of their expressions with FMF attacks. Serum IL-10, IL-12, and IL-18 levels from patients with FMF were investigated. Thirty-one FMF patients with attack-free, 24 FMF patients with attack and 20 healthy controls were enrolled in the study. The levels of IL-10, IL-12p70 and IL-18 were measured by ELISA. Serum IL-10 levels were not different in FMF patients with attack and attack-free, and healthy controls. Serum IL-12 levels in FMF patients both with attack and attack-free were significantly higher than healthy controls (P = 0.002 and P = 0.047, respectively). There were no differences between FMF patients with attack and attack-free with regard to serum IL-12 levels. Serum IL-18 levels in FMF patients with attack and attack-free were significantly higher than healthy controls (P < 0.001 for both groups). With respect to serum IL-18 levels, no difference was found between FMF patients with attack and attack-free. Our results suggest that IL-12 and IL-18 contribute to the establishment of Th1 polarization seen in FMF and play a part in its pathogenesis. Detection of increased levels of IL-12 and IL-18 in patients with inactive disease implies that they seem to assist Th1 activation and subclinical inflammation persisting during the attack-free period of the disease.

Adult↗
PubMed2007

Immunopathogenesis of Behçet's disease with special emphasize on the possible role of antigen presenting cells.

Behçet's disease (BD) is a systemic vasculitis with unclear etiology and pathogenesis. Although several viral and bacterial causes have been investigated in detail for several years, of late it is widely accepted that microorganisms may play a role as a trigger, or as a cross-reactive antigens that interfere with self-antigens, such as heat-shock proteins. Genes such as HLA-B51, MICA and TNF, considered to play a crucial role in the pathogenesis of BD, are located in the major histocompatibility complex (MHC). However, it has been accepted that, only HLA-B51 is directly related with pathogenesis of the disease, and others have strong linkage disequilibrium with HLA-B51. Some other genes such as IL1, Factor V and ICAM-1, KIR and eNOS assumed to take a part in the pathogenesis are settled out of the MHC region. In patients with BD, several abnormalities in innate and acquired immunity were detected. Mainly, the hypersensitivity of T lymphocytes to different types of antigens plays a critical role in the pathogenesis. However, it is not clear that whether defective signal transduction or antigen presenting cell (APC) dysfunction is responsible for T cell hypersensitivity. Cytokines and chemokines secreted from APCs and T cells are suggested to cause the neutrophil hyperactivation. Activated neutrophils secrete some cytokines, which prime themselves and also stimulate Th1 cells. These relationships among APCs, Th1 lymphocytes and neutrophils constitute the basis of immune responses in BD. In this review, we focus on the possible role of APC in the pathogenesis of BD with an attempt to take attention of researchers in this field to these cells at the crossroads of innate and adaptive immunity, and discuss other potential contributors including cells of the immune system and mediators.

Antigen-Presenting Cells↗
PubMed2006

Atypical carcinoid tumor of the thymus with ectopic ACTH production developed during the course of etanercept treatment--case report.

Ever since the introduction of anti-tumor necrosis factor (TNF) agents, concerns have been raised regarding their potential for developing malignancy. We report the development of thymic atypical carcinoid tumor 9 months after the initiation of etanercept therapy in a patient having refractory spondylarthritis. This case indicates the need for following large cohorts of patients receiving anti-TNF agents to address the long-term effect of these agents on malignancies.

Adult↗
PubMed2006

Expression of CXCR-1 and CXCR-2 chemokine receptors on synovial neutrophils in inflammatory arthritides: does persistent or increasing expression of CXCR-2 contribute to the chronic inflammation or erosive changes?

OBJECTIVE: To analyze the CXCR-1 and CXCR-2 chemokine receptor expression on peripheral blood neutrophils (PBN) and synovial fluid neutrophils (SFN) of patients with rheumatoid arthritis (RA) and Behçet's disease (BD) (characterized by erosive and non-erosive arthritis, respectively), and to compare them with those of patients with osteoarthritis (OA). METHODS: We used flow cytometry to investigate the expression of CXCR-1 and CXCR-2 chemokine receptors on PBN and SFN of fifty-five (22 RA, 22 BD and 11 OA) age and sex-matched patients. RESULTS: In respect to chemokine receptor expression on neutrophils isolated from patients with RA, mean fluorescein intensity (MFI) of CXCR-1 chemokine receptors on PBN from active and inactive RA patients, and SFN from patients with RA were 151 (90-395), 129 (81-539) and 136 (64-220), respectively, and there were not statistically significant difference each other. But MFI of CXCR-2 chemokine receptors on SFN of patients with RA was 18 (10-32), and significantly higher than PBN of active and inactive RA patients (MFI: 10 (6-15) and 12 (7-16), P=0.002 and 0.037, respectively). In respect to chemokine receptor expression on neutrophils isolated from patients with BD, MFI of CXCR-1 chemokine receptors on PBN of active BD patients was 245 (97-844), and higher than PBN of active RA patients and SFN of BD patients (MFI: 151 (90-395) and 134 (61-231), P=0.047 and 0.017, respectively). MFI of CXCR-2 chemokine receptors on PBN of active and inactive BD patients, and SFN of patients BD were 10 (6-14), 10 (2-16), and 12 (8-24), respectively, there were not statistically significant difference each other. MFI of CXCR-1 chemokine receptors on SFN from patients with RA, BD, and OA were 136 (64-220), 134 (61-231), and 114 (60-180), respectively, and there was no difference between the study groups. MFI of CXCR-2 chemokine receptors on SFN of patients with RA was 18 (10-32), and higher than patients with BD and OA (MFI: 12 (8-24) and 11 (9-18), P=0.037 and 0.005, respectively), though there was no difference between last two groups. CONCLUSION: Our study points that CXCR-1 and CXCR-2 chemokine receptors of SFN may have diverse functions in the course of inflammatory arthritides. These results indicate that CXCR-2 chemokine receptor might play more critical role in long lasting accumulation of neutrophils within the synovial fluid of patients with RA.

Arthritis, Rheumatoid↗
PubMed2006

Hydatid cysts in muscle: a modified percutaneous treatment approach.

INTRODUCTION: Any organ in the human body may be affected by hydatid disease, but the liver and the lungs are most commonly affected. A rare localization of hydatid disease is within muscle tissue. Herein we present three patients with muscular hydatid disease who were successfully treated with a modified percutaneous approach. METHODS: Patients with Gharbi type III cysts were treated on an outpatient basis. All procedures were performed under ultrasound guidance in the ultrasonography unit of our department. After local anesthesia, percutaneous puncture was performed in a one-step procedure. After free drainage stopped, absolute ethanol and polidocanol were injected into the cyst cavity. After the procedure, the patient was observed for at least six hours for any adverse reactions and sent home. Patients were followed-up with ultrasonography. A positive treatment effect was characterized by a reduction of the cyst's pseudo-tumor pattern and size, and by detachment of the germinal membrane. RESULTS: The three patients in this report had a total of five hydatid cysts in muscle tissue and were all successfully treated with a modified percutaneous approach without recurrence. CONCLUSION: Percutaneous drainage without re-aspiration is simple, easy to apply, low cost, repeatable, and does not require hospitalization. There have been no reported deaths associated with the procedure and morbidity is very low. When the technique is applied properly, relapses do not occur. With its low complication rate and its suitability for outpatient treatment, this method can be an alternative to surgery or puncture, aspiration, injection, and re-aspiration (PAIR) in selected patients.

Administration, Cutaneous↗
PubMed2006

The effects of topical ketorolac and indomethacin on measles conjunctivitis: randomized controlled trial.

PURPOSE: To compare the effect of topical ketorolac and indomethacin on measles conjunctivitis. DESIGN: Prospective double-masked placebo-controlled randomized trial. METHODS: Sixty-two patients with severe measles conjunctivitis were included in this study. All patients were hospitalized and randomly assigned to receive ketorolac 0.5% or indomethacin 0.1% in the right eye and artificial tears in the left eye. Conjunctival hyperemia, burning sensations, foreign-body sensations, and photophobia scores were conducted at baseline and at days seven and 14. A satisfaction score was evaluated at the end of the study. RESULTS: The conjunctival injection score of the control eyes was significantly higher than those of the ketorolac- and indomethacin-treated eyes at day seven (P < .05). The conjunctival injection score of the ketorolac-treated eyes was lower than that of the indomethacin-treated eyes at days seven and 14, but this did not reach statistical significance. There was no significant difference in the burning and foreign-body sensations and in the photophobia scores among the study eyes at baseline, day seven, and day 14 (P > .05). There was no significant difference in the satisfaction score among the study eyes at the end of the study (P > .05). CONCLUSIONS: In patients with measles during the first two weeks of infection, ketorolac and indomethacin were more effective than artificial tears in decreasing conjunctival hyperemia, but burning sensations, foreign-body sensations, and photophobia were unaffected.

Administration, Topical↗
PubMed2006

Saccharomyces boulardii and infection due to Giardia lamblia.

Therapy with metronidazole is the recommended option in giardiasis. However, some clinical trial reports suggest the appearance of drug resistance to explain therapeutic failure. Several investigations have been carried out on the effect of probiotic microorganisms for preventing or treating gastrointestinal diseases, but little is known about their efficacy against protozoal infections. The principal objective of our study was to evaluate the efficacy of Saccharomyces boulardii against Giardia lamblia infections. A double-blind, placebo-controlled study was carried out on adult patients with giardiasis. Group 1 (30 patients) included metronidazole 750 mg 3 times daily along with S. boulardii capsules (250 mg b.i.d. orally) for 10 d while group 2 (35 patients) was treated with metronidazole 750 mg 3 times daily and with empty capsules as placebo for 10 d. Patients were re-examined at 2 and 4 weeks after treatment, and stool examinations were performed. At week 2, G. lamblia cysts were detected in 6 cases (17.1%) of group 2 and none in group 1. At the end of the fourth week, presence of the cysts continued in the same 6 cases in group 2 (control group). These findings indicated that S. boulardii may be effective in treating giardiasis when combined with metronidazole therapy.

Adult↗
PubMed2006

Diffuse pulmonary amyloidosis that mimics interstitial lung disease in a patient with familial Mediterranean fever.

Familial Mediterranean fever (FMF) is an autosomal-recessive disorder characterized by recurrent attacks of fever, serositis, and arthritis. Amyloidosis, which mostly affects the kidneys, represents the most serious complication of the disease. The lungs, particularly after the onset of renal failure, may be asymptomatically involved in some of the patients with AA amyloidosis secondary to FMF. However, clinically detectable pulmonary amyloidosis is quite rare, and only 2 cases of pulmonary amyloidosis secondary to FMF have been reported so far. We describe a patient with pulmonary amyloidosis who had pulmonary hypertension and presented with clinical and radiologic features highly suggestive of interstitial lung disease. Amyloidosis was diagnosed only after lung biopsy. FMF was confirmed by molecular analysis.

Amyloidosis↗
PubMed2005

A multicenter study of patients with adult-onset Still's disease compared with systemic juvenile idiopathic arthritis.

Adult-onset Still's disease (AOSD) has often been regarded as the adult spectrum of systemic juvenile idiopathic arthritis (sJIA). The present study aims to compare the clinical and laboratory features, the disease course and the response to treatment in patients having AOSD with those having sJIA. Retrospective review of all available data that were filled out by adult and paediatric rheumatologists from six centers using a standard data extraction form was performed. A total of 95 patients with AOSD and 25 patients with sJIA were recruited for the study. The frequency of fever, rash, myalgia, weight loss and sore throat was higher in patients with AOSD. The pattern of joint involvement differed slightly. Laboratory findings were similar in both groups, except that liver dysfunction and neutrophilia were more common among adults. A multiphasic pattern dominated the childhood cases, whereas the most frequent course was a chronic one in adults. Corticosteroids and methotrexate were the most commonly employed therapy; however, chloroquine was another popular therapy in the adult group. We showed a difference in the rate of clinical and laboratory features between patients with AOSD and those with sJIA. AOSD and sJIA may still be the same disease, and children may simply be reacting differently as the result of the first encounter of the putative antigens with the immune system.

Adolescent↗
PubMed2005

Synovial proinflammatory cytokines and their correlation with matrix metalloproteinase-3 expression in Behçet's disease. Does interleukin-1beta play a major role in Behçet's synovitis?

The objective of this study has been the well established fact that proinflammatory cytokines and metalloproteinases play a crucial role in the pathogenesis of chronic arthritis as well as the development of pannus, with the eventual erosive changes. Among the proinflammatory cytokines, interleukin-18 (IL-18) has been shown to contribute to the pathogenesis of chronic synovitis by increasing the secretion of interleukin-1beta (IL-1beta) and the tumor necrosis factor-alpha (TNF-alpha) and also stimulating angiogenesis. The aim of this study is to investigate the synovial IL-18, IL-1beta, TNF-alpha and matrix metalloproteinase-3 (MMP-3) levels in patients with Behçet's disease (BD), and compare them with the levels of patients with rheumatoid arthritis (RA) and osteoarthritis (OA). 30 patients with BD, 20 with RA, and 20 with OA were included in the study. The synovial levels of IL-18, IL-1beta, TNF-alpha and MMP-3 were detected using the two-step sandwich ELISA method. The synovial IL-18, TNF-alpha and MMP-3 levels were significantly higher in RA patients than patients with BD (P=0.004, 0.019, 0.025, respectively) and with OA (P=0.004, 0.045, 0.032, respectively). There were no differences, with respect to the cytokine levels, when patients with BD were compared with those with OA. Patients with RA and BD had higher IL-1beta levels than patients with OA (P=0.017, 0.013, respectively). However, no such difference was found for IL-1beta between BD and RA patients. Among patients with RA, positive correlations were found between TNF-alpha and MMP-3 (r=0.683, P=0.001). Our results showed that MMP-3 and proinflammatory cytokines, except IL-1beta, were expressed in relatively small quantities in Behçet's synovitis. Detection of the lower levels of these cytokines and metalloproteinases might explain the non-erosive character of Behçet's arthritis. We suggest that IL-1beta may be involved in the pathogenesis of Behçet's synovitis.

Adult↗
PubMed2005

A neuro-Behçet's case complicated with intracranial hypertension successfully treated by a lumboperitoneal shunt.

A 21-year-old man had been diagnosed as having thrombosis of the dural sinus secondary to Behçet's disease. Despite treatment with acetozolamide, azathioprine and methylprednisolone over the ensuing 6 months, he had little improvement in his symptoms of intracranial hypertension and required frequent lumbar CFS drainage. The patient then underwent lumboperitoneal shunt operation, which resulted in rapid resolution of papilledema and gradual improvement in the visual field. In conclusion, we suggest that in BD patients with dural sinus thrombosis, in whom the intracranial hypertension developed but failed to normalize after treatment with immunosuppressive agents, lumboperitoneal shunting should be considered as an effective therapeutic tool.

Adult↗