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ABSTRACT: We investigated individual and combined effects of salinity, soil boron (B), silicon (Si) and salicylic acid (SA) on the activities
of major antioxidant enzymes (superoxide dismutase, SOD; catalase, CAT and ascorbate peroxidase, APX) and non-enzymatic antioxidants
(AA), proline, chlorophyll, anthocyanin, H2O2 concentration, stomatal resistance (SR), lipid peroxidation (MDA), membrane permeability (MP), and the uptake of sodium (Na),
chloride (Cl), boron and Si of spinach plants. In general, salinity significantly increased H2O2 and proline concentrations, antioxidant activity, membrane permeability, lipid peroxidation and SR of the spinach plants,
indicating that they were stressed, whereas application of B only increased proline concentration. However, plant fresh weights
did not decline with either treatment. The application of Si decreased H2O2 and increased the activity of SOD and CAT. The application of SA increased SOD activity. Neither SA nor Si had any effect
on the proline concentration, or MP. However, application of Si increased chlorophyll concentration and decreased lipid peroxidation
(MDA concentration). Si treatment had no effect on SR. The concentration of B in the tissues, which was strongly increased
by B treatment, was decreased by NaCl. As a result of salinity, concentrations of Na+ and Cl− ions were increased in the plant tissues, and application of Si slightly increased these concentrations. These results indicate
that exogenous Si application increases stress tolerance of spinach, a plant that is naturally reasonably resistant to combined
salinity and B toxicity, by the enhancement of antioxidant mechanisms that reduce membrane damage. Exogenous SA has a less
obvious effect, although the levels of salinity and boron stress applied were not sufficient in this experiment to reduce
plant fresh weight.
Plant Growth Regulation 04/2012; 55(3):207-219. · 1.60 Impact Factor
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ABSTRACT: Interspecific complementary and competitive interactions on yield and N, P, K, Fe, Zn and Mn nutrition of mixed wheat/chickpea
and wheat/lentil grown in a glasshouse under normal and drought conditions, and intercropping of wheat/chickpea in the field
under rainfed conditions were investigated. The results of the experiments confirmed that drought significantly decreased
the growth and mineral nutrition of all plant species. Individual plant dry weights of wheat, chickpea and lentil in the glasshouse
experiment, and vegetative shoot dry weight of intercropped wheat in the field experiment were significantly increased by
the associated plant species as compared with their monoculture. Even though there were increases in vegetative shoot dry
weight of wheat, biological and seed yield of intercropped wheat and chickpea were decreased due to the lower row number in
intercropping. However, the calculated LER (Land Equivalent Ratio) was found to be higher than 1.0 for biological and seed
yields, showing that intercropping of wheat and chickpea has an advantage over monoculture. In many cases, the drought×cropping
system interaction on the nutrient concentrations of plant species was not significant. Results of the glasshouse study showed
that P nutrition of wheat was improved by chickpea and lentil, which might result from increases in leaf acid phosphatase
in mixed cropping. The release of Fe(III)-complexing compounds from the roots was higher in the sole wheat and mixed culture
than that of monocultured chickpea and lentil. This improves Fe nutrition of wheat and chickpea, but those improvements were
not significant. However, Zn and Mn concentrations of mixed cropped chickpea were also increased. Under the field conditions,
shoot concentration of P, K, Fe, Zn and Mn in wheat were increased by intercropping. Furthermore, the concentrations of Zn
and Mn in chickpea were increased by intercropping while N, P and K concentrations were decreased. In addition, the concentrations
of N, P, K and Fe for wheat seeds and of Zn and Mn for chickpea were improved by intercropping. It is concluded that interspecific
interaction was complementary and generally facilitated the mineral nutrition of wheat and chickpea species grown in mixed
culture. Besides giving a yield advantage, intercropping of chickpea and wheat also had a positive effect on seed mineral
composition.
Nutrient Cycling in Agroecosystems 04/2012; 78(1):83-96. · 1.79 Impact Factor
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ABSTRACT: Arsenic-induced oxidative stress in chickpea was investigated under glasshouse conditions in response to application of arsenic
and phosphorus. Three levels of arsenic (0, 30 and 60mg kg−1) and four levels of P (50, 100, 200, and 400mg kg−1) were applied to soil-grown plants. Increasing levels of both arsenic and P significantly increased arsenic concentrations
in the plants. Shoot growth was reduced with increased arsenic supply regardless of applied P levels. Applied arsenic induced
oxidative stress in the plants, and the concentrations of H2O2 and lipid peroxidation were increased. Activity of superoxide dismutase (SOD) and concentrations of non-enzymatic antioxidants
decreased in these plants, but activities of catalase (CAT) and ascorbate peroxidase (APX) were significantly increased under
arsenic phytotoxicity. Increased supply of P decreased activities of CAT and APX, and decreased concentrations of non-enzymatic
antioxidants, but the high-P plants had lowered lipid peroxidation. It can be concluded that P increased uptake of arsenic
from the soil, probably by making it more available, but although plant growth was inhibited by arsenic the P may have partially
protected the membranes from arsenic-induced oxidative stress.
Plant and Soil 04/2012; 314(1):211-220. · 2.73 Impact Factor
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ABSTRACT: Behc¸et's disease is a chronic vasculitis of unknown aetiology. Particular viral and bacterial pathogens have long been suspected of playing a role in the pathogenesis of the disease. Chlamydia pneumoniae is an intracellular bacterium capable of causing chronic infections. Some reports have suggested that the microorganism might be involved in the pathogenesis of vasculitis. The purpose of the present study was to investigate a possible correlation between C. pneumoniae infection and Behc¸et's disease. For this purpose, 90 consecutive patients with Behc¸et's disease and 50 healthy controls were enrolled. Immunoglobulin A (IgA) and IgG antibodies to C. pneumoniae were determined by 2 different techniques, namely indirect fluorescent antibody assay (IFA) and enzyme linked immunosorbent assay (ELISA). IgA antibodies to C. pneumoniae were detected in 17 (18.9%) patients with Behc¸et's disease and in 1 (2%) healthy control by IFA. By ELISA 27 patients (30.0%) and 6 controls (12.0%) had C. pneumoniae IgA. A significant difference was observed for IgA seropositivity between the 2 groups. Although IgG seropositivity between the 2 groups did not differ significantly, the number of individuals with IgG titres of ≥1:1000 was significantly higher in the patient group (43.1%) compared with the control group (13.9%). These finding provide serological evidence of chronic C. pneumoniae infection in association with Behc¸et's disease.
07/2009; 36(6-7):428-430.
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ABSTRACT: Concentrations of elements (P, K, S, Ca, Mg, Si, Cl, Fe, Zn, Cu, Mn, Mo, Na, Al, Ti, Ni, Ba, As, Br, Rb and Sr) of wheat, sunflower, chickpea and lentil cultivars grown in low and high phosphorus soil were investigated by polarized energy dispersive X-ray fluorescence (PEDXRF). The phosphorus treatment x cultivars interaction was significant for the growth and element concentrations, and cultivars within plant species differed considerably with respect to element concentrations as the result of P fertilization. Shoot growth of the cultivars of each plant species was increased in response to phosphorus fertilization. Application of P increased the P concentrations of wheat, sunflower, chickpea and lentil cultivars. Under high P conditions, mean K concentrations of wheat and sunflower cultivars were decreased while the mean K concentrations of chickpea and lentil were increased. With the exception of sunflower cultivars, applied P significantly increased S concentration of the cultivars of wheat, chickpea and lentil. Calcium concentrations of wheat and sunflower cultivars were reduced by P fertilization and that of chickpea and lentil were increased. Applied P decreased mean Mg concentrations in sunflower, increased in chickpea and lentil cultivars and showed no effects on the wheat cultivars. Applied P significantly decreased mean Si concentrations of wheat and sunflower while mean Si concentrations of the chickpea and lentil cultivars were increased. Chloride concentrations of the wheat and sunflower cultivars were decreased and those of the chickpea and lentil cultivars were increased by applied P. In general, Fe concentrations of the wheat and chickpea cultivars were significantly increased by applied P. Zinc and Cu concentrations of all the cultivars of the four plant species were reduced by P, particularly Zn concentrations. However, applied P increased mean Mn concentrations of wheat and chickpea and decreased those of chickpea cultivars. Mean Mo concentrations of wheat and chickpea increased but decreased in sunflower and lentil cultivars. In general, applied P increased mean Na concentration of wheat and decreased that of chickpea and lentil. Aluminum concentrations of wheat and chickpea cultivars were decreased by applied P. Applied P decreased Ti concentrations of wheat and sunflower cultivars and increased Ti concentrations of chickpea and lentil. Nickel concentrations of wheat and chickpea were increased and those of sunflower and lentil were decreased by applied P. Applied P reduced the Ba and increased As and Rb concentrations of all the cultivars within the plant species. Bromine concentrations of wheat and lentil were decreased and those of sunflower and chickpea were increased by applied P. Finally, Sr concentrations in wheat and sunflower cultivars were reduced, and increased in chickpea cultivars with applied P. Copyright © 2009 John Wiley & Sons, Ltd.
X-Ray Spectrometry 05/2009; 38(5):451 - 462. · 1.45 Impact Factor
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Journal of Plant Interactions 09/2008; 3(3):181-188. · 0.64 Impact Factor
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ABSTRACT: Two glasshouse studies were conducted to investigate the effect of interspecific complementary and competitive root interactions and rhizosphere effects on the concentration and uptake of Na, Cl and B, and N, P, K, Ca, Mg, Fe, Zn and Mn nutrition of mixed cropped peanut with maize (Experiment I), and barley (Experiment II) grown in nutrient-poor saline-sodic and B toxic soil. Mixed cropped plants were grown in either higher density or lower density. The results of the experiment revealed that dry shoot weight decreased in peanut but increased in maize and barley with associated plant species compared to their monoculture. Shoot Na and Cl concentrations of peanut decreased significantly in both experiments, regardless of higher or lower density. The concentrations of Na also decreased in the shoots of mixed cropped maize and barley, but Cl concentrations increased slightly. The concentration of B significantly decreased in mixed cropping in all plant species regardless of higher or lower density. Rhizosphere chemistry was strongly and differentially modified by the roots of peanut, maize and barley, and mixed growing. There were significant correlations between the root-secreted acid phosphatases (S-APase), acid phosphatase in rhizosphere (RS-APase) and rhizosphere P concentration (RS-P) in the both experiments. The Fe-solubilizing activity (Fe-SA) and ferric reducing (FR) capacity of the roots were generally higher in mixed culture relative to their monoculture, which improved Fe, Zn and Mn nutrition of peanut. Further, there were also significant correlations among FR, Fe-SA and RS-Fe concentrations. Peanut facilitated P nutrition of maize and barley, while maize and barley improved K, Fe, Zn and Mn nutrition of peanut grown in nutrient-poor saline-sodic and B toxic soil.
Journal of Plant Physiology 02/2008; 165(5):490-503. · 2.79 Impact Factor
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Journal of Plant Nutrition. 10/2007; 30(10):1555-1568.
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Journal of Plant Nutrition 09/2007; 30(9):1455-1469. · 0.64 Impact Factor
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ABSTRACT: The effect of silicon (Si) on the growth, sodium (Na), chloride (Cl), boron (B) concentrations, lipid peroxidation (MDA), membrane permeability (MP), lypoxygenase activity (LOX), proline (PRO) and H(2)O(2) accumulation, and the activities of major antioxidant enzymes (superoxide dismutase, SOD; catalase, CAT and ascorbate peroxidase, APX) of barley grown in original sodic-B toxic soil were investigated. Si applied to the sodic-B toxic soil at 70, 140 and 280 mg kg(-1) levels significantly increased Si concentrations of the plants and counteracted the deleterious effects of sodicity (Na ions) and B on shoot growth. Membrane permeability and the concentrations of H(2)O(2) and MDA increased, while PRO concentration decreased in plants grown in sodic-B toxic soil without Si. LOX activity was increased by applied Si. Compared with control plants, the activities of SOD and CAT were decreased, but APX was increased by applied Si levels.
Journal of Plant Physiology 07/2007; 164(6):807-11. · 2.79 Impact Factor
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ABSTRACT: It has been proposed that salicylic acid (SA) acts as an endogenous signal molecule responsible for inducing abiotic stress tolerance in plants. The effect of varying salicylic acid (SA) supply (0, 0.1, 0.5 and 1.0mM) on growth, mineral uptake, membrane permeability, lipid peroxidation, H(2)O(2) concentration, UV-absorbing substances, chlorophyll and carotenoid concentrations of NaCl (40 mM) stressed maize (Zea mays L.) was investigated. Exogenously applied SA increased plant growth significantly both in saline and non-saline conditions. As a consequence of salinity stress, lipid peroxidation, measured in terms of malondialdehyde (MDA) content and membrane permeability was decreased by SA. UV-absorbing substances (UVAS) and H(2)O(2) concentration were increased by increasing levels of SA. SA also strongly inhibited Na(+) and Cl(-) accumulation, but stimulated N, Mg, Fe, Mn and Cu concentrations of salt stressed maize plants. These results suggest that SA could be used as a potential growth regulator to improve plant salinity stress resistance.
Journal of Plant Physiology 07/2007; 164(6):728-36. · 2.79 Impact Factor
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Journal of Plant Interactions 06/2007; 2(2):105-113. · 0.64 Impact Factor
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ABSTRACT: We investigated effect of silicon (Si) on the growth, uptake of sodium (Na), chloride (Cl), boron (B), stomatal resistance
(SR), lipid peroxidation (MDA), membrane permeability (MP), lipoxygenase (LOX) activity, proline (PRO) accumulation, H2O2 accumulation, non-enzymatic antioxidant activity (AA) and the activities of major antioxidant enzymes (superoxide dismutase,
SOD; catalase, CAT and ascorbate peroxidase, APX) of spinach and tomato grown in sodic-B toxic soil. Si applied to the sodic-B
toxic soil at 2.5 and 5.0mM concentrations significantly increased the Si concentration in the plant species and counteracted
the deleterious effects of high concentrations of Na, Cl and B on root and shoot growth by lowering the accumulation of these
elements in the plants. Stomatal resistance, MP, MDA and the concentrations of H2O2 and PRO were higher in the plants grown in sodic-B toxic soil without Si: LOX activity of excised leaves of both species was
increased by Si. Antioxidant activities of both species were significantly affected by Si, with the activities of SOD, CAT
and APX decreased and AA increased by applied Si. For most of the parameters measured, it was found that 5mM Si was more
effective than the 2.5mM Si. Based on the present work, it can be concluded that Si alleviates sodicity and B toxicity of
the plants grown in sodic-B toxic soil by preventing both oxidative membrane damage and also translocation of Na, Cl and B
from root to shoots and/or soil to plant, and lowering the phytotoxic effects of Na, Cl and B within plant tissues. It was
concluded that tomato was more responsive to Si than spinach since it was more salt sensitive than spinach. To our knowledge,
this is the first report that Si improves the combined salt and B tolerance of spinach and tomato grown in naturally sodic-B
toxic soil, and which describes membrane-related parameters and antioxidant responses.
Plant and Soil 12/2006; 290(1):103-114. · 2.73 Impact Factor
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ABSTRACT: Phosphorus (P) efficiency (relative growth), which is described as the ratio of shoot dry matter or grain yield at deficient P supply to that obtained under adequate P supply, was compared in 25 winter wheat cultivars grown under greenhouse and field conditions with low and adequate P levels in a P-deficient calcareous soil. Adequate P supply resulted in significant increases in shoot dry weight and grain yield under both experimental conditions. In the greenhouse experiment, the increases in shoot dry weight under adequate P supply (80 mg kg−1) were from 0% (cv: C-1252) to 34% (cv: Dagdas). Under field conditions, the cultivars showed much greater variation in their response to adequate P supply (60 kg ha−1): the increases in shoot dry weight and grain yield with adequate P supply were between −2% (cv: Sivas-111/33) and 25% (cv: Kirac-66) for shoot dry matter production at the heading stage and between 0% (cv: Kirkpinar-79) and 76% (cv: Kate A-1) for grain yield at maturity. Almost all cultivars behaved totally different in their response to P deficiency under greenhouse and field conditions. Phosphorus efficiency ratios (relative growth) under greenhouse conditions did not correlate with the P efficiency ratios under field conditions. In general, durum wheat cultivars were found to be more P efficient compared with bread wheat cultivars. The results of this study indicated that there is wide variation in tolerance to P deficiency among wheat cultivars that can be exploited in breeding new wheat cultivars for high P deficiency tolerance. The results also demonstrated that P efficiency was expressed differently among the wheat cultivars when grown under greenhouse and field conditions and, therefore, special attention should be paid to growth conditions in screening wheat for P efficiency.
Soil Science and Plant Nutrition 07/2006; 52(4):470 - 478. · 1.02 Impact Factor
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ABSTRACT: The aim of our prospective study was to evaluate the predictive value of serum procalcitonin (PCT) level in comparison with C-reactive protein level and erythrocyte sedimentation rate for the diagnosis of pulmonary tuberculosis (PTB) on admission and 6 months after the administration of anti-tuberculous chemotherapy (ATCT). Seventy-five adult male patients with active PTB who were mycobacteriologically diagnosed (smear and culture positivity) were examined in this study. As a control group, 75 healthy adult males were enrolled. The measured serum PCT levels were within the normal range both in healthy individuals and in patients 6 months after ATCT. Serum PCT levels had been slightly high on admission in patients with PTB in comparison with controls (P = 0.01) and patients who had ATCT (P = 0.001), and this difference was statistically significant, but the PCT levels of most cases with PTB (58.7%) were below the usual cut-off level (0.5 ng/mL). We conclude from this study that the serum PCT level was not a reliable indicator in the diagnosis of active PTB because of its low sensitivity (41.3%), and in most cases it was not capable of overcoming the cut-off level even if statistically meaningful results were obtained. The PCT test for the presumptive diagnosis of PTB cannot be substituted for microbiological, epidemiological, clinical and radiological data.
Japanese journal of infectious diseases 07/2006; 59(3):164-7. · 1.49 Impact Factor
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ABSTRACT: The aim of our study is to determine whether there is a relationship between familial Mediterranean fever (FMF) attacks and serum leptin levels. We enrolled 25 patients (22 males and 3 females) and 25 healthy controls (21 males and 4 females) with a mean age of 24.42 +/- 1.22 (Mean +/- SEM) years and 24.30 +/- 1.19 years (Mean +/- SEM), respectively. We investigated serum levels of leptin, interleukin-6 (IL-6) erythrocyte sedimentation rate (ESR), C-reactive protein (CRP),fibrinogen, and leukocyte counts before the attack and 8-12 hours after the attack started. The same parameters have been investigated in the control subjects. The mean serum leptin levels before the attacks were 6.45 +/- 1.05 (Mean +/- SEM) and during the attacks were 7.59 +/- 1.3 (Mean +/- SEM) in FMF group,respectively. There was a slight increase in serum leptin levels during the attacks but it was not statistically significant (P > .05). The mean serum leptin levels were 16.12 +/- 2.81 in the control group which were not different from the mean serum leptin levels before and during the attack periods in the study group (P > .05). However, there were statistical differences in the serum levels of IL-6, ESR, CRP, fibrinogen, and leukocyte counts before and during the attack periods (P > .05). No correlation was found between serum leptin levels and IL-6, ESR, CRP, fibrinogen, and leukocyte counts (P > .05). Serum leptin levels do not increase during FMF attacks and therefore it is not useful for diagnostic purposes and follow-up during treatment.
Mediators of Inflammation 01/2006; 2006(2):62868. · 3.26 Impact Factor
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ABSTRACT: It has been proposed that salicylic acid (SA) acts as an endogenous signal molecule responsible for inducing environmental stress tolerance in plants. In this study, the effects of seed soaked (1.0 mM for 24 h) and soil incorporated (0.1 mM and 0.5 mM) salicylic acid (SA) supply on growth and mineral concentrations of maize ( Zea mays L., Hamidiye F 1 ) grown under either salt, boron toxicity or drought-stressed conditions were investigated. Exogenously applied SA either with seed soaked (SS) or soil incorporated (SI) increased plant growth significantly in all the stresses conditions. Salicylic acid inhibited Na and Cl accumulation in saline conditions, and 0.5 mM of soil incorporated SA decreased B significantly in boron toxicity treatment. Except in drought condition, SA treatments stimulated N accumulation in plants. And P, K, Mg and Mn concentrations of SA received plants were increased in the stress conditions. These results suggest that SA regulates the response of plants to the environmental stresses and could be used as a plant growth regulator to improve plant growth and stimulate mineral nutrient concentrations under stress conditions.
Archives of Agronomy and Soil Science 11/2005; 51(6/December 2005):687-695.
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ABSTRACT: Familial Mediterranean fever (FMF) is a recessively inherited inflammatory disorder, characterized by recurrent attacks of fever and polyserositis. It has been considered that miscellaneous cytokines take part in the pathogenesis of the disease. The aim of this study was to investigate serum levels of soluble interleukin-2 receptor (sIL-2R), interleukin-6 (IL-6), and interleukin-10 (IL-10) in patients with FMF. The study included 42 patients with FMF (3 females, 39 males, mean age: 24.43 years) and 20 healthy volunteers as the control group (18 males, 2 females, mean age: 23.2 years). The patients were chosen according to Eliakim criteria. After recording their history and performing an examination, leukocyte counts, erythrocyte sedimentation rates (ESR), C-reactive protein (CRP), fibrinogen, sIL-2R, IL-6, and IL-10 levels were measured before and during attacks. A significant increase was found in leukocyte ( p<0.001), ESR ( p<0.001), CRP ( p<0.001), and fibrinogen ( p<0.001) levels of the patient group in the attack period compared to those in the quiescent state. sIL-2R ( p=0.019) and IL-6 ( p<0.001) levels showed significant increases during attacks compared to the levels before an attack. There was no significant difference between IL-10 levels. The levels of the three cytokines were significantly high both before and during the attacks compared to the control group. As a result, the elevation of sIL-2R and IL-6 levels both before and during the attacks compared to control group suggests the existence of continuous cytokine activation in the patients. No significant increase in the IL-10 levels in spite of the significant rise of sIL-2R and IL-6 during attacks supports the notion of inflammation and also reveals that compensation by anti-inflammatory IL-10 does not seem to occur.
Clinical Rheumatology 09/2004; 23(4):333-7. · 2.00 Impact Factor
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ABSTRACT: As is the case with many other autoimmune diseases, there is an association between vitiligo and HLA complex. HLA subtypes vary with racial/ethnic background. The purpose of this study was to determine which HLA class I antigens and HLA class II alleles are associated with Turkish vitiligo patients. Forty-one patients with vitiligo and 61 healthy control subjects were typed for HLA class II alleles. Thirty-three out of 41 patients with vitiligo and 100 healthy transplant donors were typed for HLA class I antigens. HLA DNA typing was performed by polymerase chain reaction/sequence specific primer method for class II. HLA typing for class I was performed by serological method. The frequency of HLA DRB1*03 was 0.6340 in patients compared to 0.2950 in controls (P = 0.0014). The frequency of HLA DRB1*04 was found to be 0.6830 in patients compared to 0.2950 in controls (P = 0.00026). The allele HLA DRB1*07 was present in 0.390 of patients compared to 0.0820 of the controls (P = 0.0004). A preventive antigen for the manifestation of vitiligo has not been identified in this study. Our findings suggest that DRB1*03, DRB1*04 and DRB1*07 alleles are genetic markers for general susceptibility to vitiligo in a Turkish population.
Pigment Cell Research 05/2004; 17(2):181-4. · 4.29 Impact Factor
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ABSTRACT: In September 2002, an outbreak of toxoplasmosis was noted in a male boarding high school on the Aegean coast of Turkey. We have focused our efforts to investigate the sex hormones in this population.
Blood samples were collected from 40 male patients, 17-18 years old, who also had positive titres of antibody to Toxoplasma gondii. Serum FSH, LH, free testosterone (FT), total testosterone (TT), interferon-gamma (IFN-gamma), interleukin-1beta (IL-1beta) and macrophage-inflammatory protein-1alpha (MIP-1alpha) concentrations were measured in all patients and 20 control subjects. Initially, the patients were divided on the basis of the levels of sex hormones into the following groups: patients who had normal sex hormone levels (n = 31) as group A and patients with low sex hormone levels (n = 9) as group B.
IL-1beta levels were found to be higher in group B patients than group A. The levels of IL-1beta correlated significantly in a negative manner with FSH, LH, FT and TT in all patients with acute toxoplasmosis (n = 40).
Acute toxoplasma infection may cause temporary hypogonadotrophic gonadal insufficiency regardless of the course of the disease.
Human Reproduction 05/2004; 19(4):859-66. · 4.47 Impact Factor
