نتایج جستجو برای: hbf
تعداد نتایج: 869 فیلتر نتایج به سال:
Studies in vitro by Pasvol et al (Nature, 270:171, 1977) have indicated that the growth of Plasmodium falciparum in cells containing fetal hemoglobin (HbF = alpha2gamma2) is retarded, but invasion is increased, at least in newborn cells. Normal neonates switch from about 80% HbF at birth to a few percent at the end of the first year of life. Carriers of beta-thalassemia trait exhibit a delay in...
چکید ه سابقه و هدف سطح بالای هموگلوبین جنینی (hbf) تأثیر عمده ای بر تالاسمی بتا دارد به طوری که افزایش تولید hbf ، شدت بیماری را کاهش می دهد. سه لوکوس hbs1l–myb در کروموزوم 6q23 ، bcl11a در کروموزوم 2p16 و ژن گاماگلوبین با افزایش سطح hbf در بیماران مبتلا به تالاسمی در ارتباط می باشند . در مطالعه کنونی، ارتباط برخی پلی مورفیسم های افزایش دهنده سطح hbf در بیماران مبتلا به تالاسمی و افراد سالم...
background: efficient induction of fetal hemoglobin (hbf) is considered as an effective therapeutic approach in beta thalassemia. hbf inducer agents can induce the expression of γ-globin gene and produce high levels of hbf via different epigenetic and molecular mechanisms. thalidomide and sodium butyrate are known as hbf inducer drugs. material and methods : cd133 + stem cells were isolated fro...
BACKGROUND Foetal haemoglobin has been implicated in the modulation of sickle cell crisis. Its level is generally inversely proportional to the severity of sickle cell disease (SCD) for a given sickle cell phenotypes. The main aim of therapy for vaso-occlusive crisis (VOC), which is the hallmark of SCD, is to reduce the chances of sickling through the prevention of polymerization of HbS. One wa...
beta-Thalassemia and sickle cell disease both display a great deal of phenotypic heterogeneity, despite being generally thought of as simple Mendelian diseases. The reasons for this are not well understood, although the level of fetal hemoglobin (HbF) is one well characterized ameliorating factor in both of these conditions. To better understand the genetic basis of this heterogeneity, we carri...
The γ(G)-158 (C→T) polymorphism plays important function in the disease severity of sickle cell anemia. The XmnI restriction site at -158 position of the γ(G)-gene is associated with increased expression of the γ(G)-globin gene and higher production of HbF. This study aims to determine the frequency of the different genotypes of the γ(G) Xmn I polymorphism in sickle cell anemia and sickle cell ...
Background and Objectives. β-Thalassemia and sickle cell disease are genetic disorders characterized by reduced and abnormal β-globin chain production, respectively. The elevation of fetal hemoglobin (HbF) can ameliorate the severity of these disorders. In sickle cell disease patients, the HbF level elevation is associated with three quantitative trait loci (QTLs), BCL11A, HBG2 promoter, and HB...
5-azacytidine (5-Aza) is a potent inducer of fetal hemoglobin (HbF) in people with beta-thalassemia and sickle cell disease. Two models have been proposed to explain this activity. The first is based on the drug's ability to inhibit global DNA methylation, including the fetal globin genes, resulting in their activation. The second is based on 5-Aza's cytotoxicity and observations that HbF produ...
Single nucleotide substitutions in the promoter regions of the A gamma- and G gamma-globin genes have been associated with increased fetal hemoglobin (HbF) production. We wished to determine whether these or other unrecognized substitutions in the gamma promoter regions are responsible for the 20-fold variation in HbF production in sickle cell patients or normal adults. From a random sampling o...
We show that lentiviral delivery of human gamma-globin gene under beta-globin regulatory control elements in hematopoietic stem cells (HSCs) results in sufficient postnatal fetal hemoglobin (HbF) expression to correct sickle cell anemia (SCA) in the Berkeley "humanized" sickle mouse. Upon de-escalating the amount of transduced HSCs in transplant recipients, using reduced-intensity conditioning ...
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