beta-thalassemia/tyrosine

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Quantitative determination of ortho- and meta-tyrosine as biomarkers of protein oxidative damage in beta-thalassemia.

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Oxidative stress in thalassemia is caused by secondary iron overload and stems from blood transfusion and increased iron uptake. In this study, we hypothesized that levels of o- and m-tyrosine, products of hydroxyl radical attack on phenylalanine, would be elevated in beta-thalassemia

Soluble fms-Like Tyrosine Kinase 1 as a Link Between Angiogenesis and Endothelial Dysfunction in Pediatric Patients With β-Thalassemia Intermedia.

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Endothelial damage has been implicated in the pathogenesis of vascular complications in β-thalassemia intermedia (β-TI). Soluble fms-like tyrosine kinase 1 (sFLT-1) is a member of the vascular endothelial growth factor receptor (VEGFR) family. Soluble fms-like tyrosine kinase 1 is an antiangiogenic

Infrared spectroscopic identification of beta-thalassemia.

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BACKGROUND The aim of this study was to investigate the potential of infrared (IR) spectroscopy as a fast and reagent-free adjunct tool in the diagnosis and screening of beta-thalassemia. METHODS Blood was obtained from 56 patients with beta-thalassemia major, 1 patient with hemoglobin H disease,

H63D mutation in the HFE gene increases iron overload in beta-thalassemia carriers.

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OBJECTIVE Hereditary hemochromatosis (HH) is an autosomal recessive disorder of iron metabolism. The HFE gene implicated in this disorder has been identified on chromosome 6 (6p21.3). The most prevalent mutation in HH patients changes the 282 cysteine residue to tyrosine (C282Y). The role of a

Increased tyrosine phosphorylation of band 3 in hemoglobinopathies.

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In order to investigate the tyrosine phosphorylation of band 3, we performed immunoblotting of intact red cells using anti-phosphotyrosine antibody of 21 patients with sickle cell disorders (11 SS, 5 Sbeta, 5 SC), 7 patients with beta thalassemias (5 beta thal intermedia, 2 deltabeta thal), 10

Beta-thalassemia major and its effect on amino acid metabolism and growth in patients in the United Arab Emirates.

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BACKGROUND There may be a marked reduction in essential amino acids in the serum of children with thalassemia major and this is related to decreased growth in affected children. METHODS One hundred patients with beta-thalassemia and 50 control children selected from among those who had presented

Effect of heterozygous beta thalassemia on the phosphorylative response to Plasmodium falciparum infection.

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Malaria parasites interact with the host cell membrane inserting new proteins and inducing oxidative and phosphorylative changes of erythrocyte proteins. In the present report we monitored the time dependent oxidative and phosphorylative modifications induced by parasites in heterozygous beta

The profile of free amino acids in latent fingerprint of healthy and beta-thalassemic volunteers.

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The aim of the present work is to apply a non-invasive test, using thumb fingerprint residue analysis, for detection of beta-thalassemia (beta-Thal). The relative percentages of free amino acids (AA) in the latent fingerprint of beta-Thal patients and healthy subjects were compared. The sample

First reported case of Haemoglobin-M Hyde Park in a Malay family living in Malaysia.

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Haemoglobin (Hb)-M Hyde Park, also known as Hb-M Akita is a rare type of hereditary Hb M due to autosomal dominant mutation of CAC>TAC on codon 92 of β globin gene resulting in the replacement of histidine by tyrosine on β globin chain. This variant Hb has a tendency to form methaemoglobin (metHb).

Pseudodominance of lipoprotein lipase (LPL) deficiency due to a nonsense mutation (Tyr302>Term) in exon 6 of LPL gene in an Italian family from Sardinia (LPL(Olbia)).

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We analyzed the molecular defect in the lipoprotein lipase (LPL) gene of a young boy from Sardinia who had primary hyperchylomicronemia, pancreatitis, and a complete LPL deficiency in post-heparin plasma. Analysis of LPL gene was performed by using single strand conformation polymorphism (SSCP) and

A new β chain hemoglobin variant with increased oxygen affinity: Hb Santa Giusta Sardegna [β93(F9)Cys→Trp; HBB c.282T>G].

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During a screening program for the identification of β-thalassemia (β-thal) carriers in Sardinia, Italy, we identified two subjects with increased hemoglobin (Hb) levels and an abnormal Hb variant. The same variant was detected in a family member. DNA sequencing revealed a TGT > TGG mutation at

Involvement of phosphatases in proliferation, maturation, and hemoglobinization of developing erythroid cells.

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Production of RBCs is triggered by the action of erythropoietin (Epo) through its binding to surface receptors (Epo-R) on erythroid precursors in the bone marrow. The intensity and the duration of the Epo signal are regulated by several factors, including the balance between the activities of

Hereditary methemoglobinemia caused by Hb M-Hyde Park (Hb M-Akita) (HBB:c.277C > T; p.His93Tyr).

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Healthy human blood contains only a trace amount of methemoglobin (Hb M), less than 1%. In Hb M iron is present in the oxidized ferric state (Fe³⁺) not in the reduced ferrous form (Fe²⁺) and this reduces the ability of hemoglobin to bind oxygen. The described rare hemoglobin

PlGF and sFlt-1 levels in patients with non-transfusion-dependent thalassemia: Correlations with markers of iron burden and endothelial dysfunction.

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BACKGROUND Levels of the angiogenic cytokines placental growth factor (PlGF) and soluble Fms-like tyrosine kinase-1 (sFlt-1) and the angiogenic balance, expressed by sFlt-1/PlGF ratio, are perturbed in sickle-cell disease and iron overload, but they have not been evaluated in

Methods Employed in Cytofluorometric Assessment of Eryptosis, the Suicidal Erythrocyte Death.

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Suicidal erythrocyte death or eryptosis contributes to or even accounts for anemia in a wide variety of clinical conditions, such as iron deficiency, dehydration, hyperphosphatemia, vitamin D excess, chronic kidney disease (CKD), hemolytic-uremic syndrome, diabetes, hepatic failure, malignancy,

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