Browsing by Author "Sebik F."

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    Sensitization to cat allergens in non-cat owner patients with respiratory allergy
    (American College of Allergy, Asthma and Immunology, 2003) Gulbahar O.; Sin A.; Mete N.; Kokuludag A.; Kirmaz C.; Sebik F.
    Background: Cats represent one of the most important sources of indoor allergens. The sensitization rate can reach up to 60% in western countries. Keeping cats indoors is uncommon in big cities in Turkey, but cats living in the streets are common. Objective: To investigate the prevalence of sensitization to cats in patients with respiratory allergy from Izmir, Turkey, and its relationship to home cat allergen levels. Methods: A total of 387 patients (70.8% female; mean age, 34.3 years) with respiratory allergic diseases (rhinitis and/or asthma) were included in this study. Skin prick test to cat was performed. House dust samples were collected from the living room of 25 patients and 14 healthy subjects. The major cat allergen (Fel d 1) levels were measured by Dustscreen. Fel d 1 levels given by the manufacturer were as follows: 0.05, 0.13, 0.40, 1.1, and 6.2 mU/mL. Results: The prevalence of cat sensitivity was 44.7% (n = 173). Only 6 patients (1.6%) had a history of feeding a cat in their houses. Thirty-six (92%) of 39 houses had detectable levels of cat allergen (mean Fel d 1 level, 2.24 ± 2.69 mU/mL). The mean Fel d 1 levels were 1.58 ± 2.51 mU/mL in the healthy group, 1.91 ± 2.61 mU/mL in the asthmatic group, and 3.26 ± 2.85 mU/mL in the group with allergic rhinitis (P = 0.12). The prevalence of cat sensitivity in patients who had 1.1 mU/mL of Fel d 1 in their homes was 57.1%. This rate was five times lower (11.1%) in patients who had the highest Fel d 1 level (6.2 mU/mL) in their homes. Conclusions: The prevalence of cat sensitivity in Izmir, where cats are generally not kept within homes, is as high as in western countries. The sampled houses have measurable levels of Fel d 1 even in the absence of indoor cats. High prevalence of cat sensitivity in Izmir is probably due to indirect exposure.
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    Serum tumor growth factor-β1 levels in patients with cirrhosis, chronic hepatitis B and chronic hepatitis C
    (2004) Kirmaz C.; Terzioǧlu E.; Topalak O.; Bayrak P.; Yilmaz O.; Ersoz G.; Sebik F.
    Chronic liver disease and cirrhosis are two of the most important health problems according to current gastroenterology literature. Based on the recent developments in the field of immunology, advanced follow-up and treatment modalities have been introduced for these disorders. Immune defence against viral infections depends on effective cellular immune responses derived mainly from Th1-related cytokines. Th2 type immune responses can inhibit efficient immune function by secretion of several cytokines such as IL-10, TGF-β1. In this particular study, we determined the serum levels of TGF-β1, which plays a role in immune suppression and induction of tissue fibrosis. We evaluated the role of TGF-β1 in the pathogenesis of chronic liver disease and cirrhosis. Fourteen chronic hepatitis B (CHB), 12 chronic hepatitis C (CHC) patients and 21 cirrhotic patients were enrolled in the study. The control group consisted of ten healthy people. Serum TGF-β1 levels were higher in both cirrhosis and CHC group when compared to those in CHB and control groups (P < 0.05). Although serum TGF-β1 levels in the cirrhosis group were higher than that in the CHC group, the difference was not statistically significant. In conclusion, elevated TGF-β1 levels in patients with CHC and cirrhosis may have a role in the pathogenesis and chronicity of these diseases.
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    T Cell Subpopulations and IL-2R in Vitiligo
    (Japanese Dermatological Association, 2004) Gunduz K.; Ozturk G.; Terzioglu E.; Sebik F.
    Immunological alterations have been implicated in the etiopathogenesis of vitiligo. The aim of this study was to determine peripheral lymphocyte subpopulations and interleukin-2 receptor (IL-2R) in patients with vitiligo. Forty-five vitiligo patients (24 female, 21 male) and 34 healthy controls (11 female, 23 male) were included into the study. Eight (17.8%) of the patients had the segmental type, and 37 (82.2%) had generalized vitiligo. The disease was active in 25 (55.6%) patients; the other 20 (44.4%) patients had static vitiligo. Flow cytometry was used to determine the percentages of total T-lymphocytes, B-lymphocytes, helper/inducer T cells, suppressor/cytotoxic T cells, natural killer (NK) cells, activated T cells and interleukin-2 receptor (IL-2R) with the use of CD3, CD19, CD4, CD8, CD16, HLA-DR and CD25 monoclonal antibodies, respectively. The mean value of helper T cells showed a significant difference (p=0.01) between the two groups with the value being 32.5% in patients and 38.1% in control subjects. CD4/CD8 was significantly lower in vitiligo patients (p=0.04). There was also a statistically significant difference in the mean percentage of activated T cells between vitiligo patients and control subjects (4.7 and 8.1, respectively; p=0.001). No statistically significant differences were found when the values were compared between segmental and generalized vitiligo patients, or between active and static cases. In conclusion, T helper/inducer cells, CD4/CD8 ratio and activated (HLA-DR+) T cells are decreased in vitiligo patients, suggesting a role for changes in cellular immunity.