9 research outputs found

    Estudo de marcadores genéticos associados a inflamação em pacientes com anemia falciforme

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    Submitted by Ana Maria Fiscina Sampaio ([email protected]) on 2013-10-11T14:30:43Z No. of bitstreams: 1 Cyntia Cajado de Souza.pdf: 4771962 bytes, checksum: bdc7d5b7181b8a72749dc6d7de91f2f3 (MD5)Made available in DSpace on 2013-10-11T14:30:43Z (GMT). No. of bitstreams: 1 Cyntia Cajado de Souza.pdf: 4771962 bytes, checksum: bdc7d5b7181b8a72749dc6d7de91f2f3 (MD5) Previous issue date: 2013Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, BrasilA anemia falciforme (HbSS) é uma doença genética com prevalência mundial elevada, caracterizada pela heterogeneidade clinica apresentando manifestações agudas e crônicas de caráter multifatorial, sendo caracterizada pela presença do estado inflamatório sistêmico. As alterações no sistema imune têm sido relacionadas a predisposição a infecções em pacientes HbSS, com produção exacerbada de anticorpos, alterações na função de leucócitos e na imunidade celular, entre outros. Estão inclusos nesta tese o conjunto de três manuscritos com o objetivo de investigar marcadores genéticos relacionados a inflamação em pacientes com HbSS, com ênfase para os polimorfismo e níveis séricos das citocinas TNFα -308G>A e IL-8 251A>T, para a provável influência dos polimorfismos gênicos TNFα-308G>A, FcRIIAH/R131, MPO-463G>A, TLR4 896A>G, e TLR9- 1237T>C na gravidade de infecções e complicações inflamatórias na HbSS, e ainda a expressão gênica dos receptores TLR2, TLR4, TLR5 e TLR9 em células dendríticas de pacientes HbSS. Nossos resultados mostraram que os níveis séricos elevados das citocinas TNFα e IL-8, bem como a presença do alelo mutante dos polimorfismos de TNFα e da IL-8 estudados estão associados com a gravidade clínica da doença. O estudo dos polimorfismos TLR9 -1237T>C e TLR4 896A>G mostraram associação com a ocorrência de infecção respiratória e acidente vascular encefálico (AVE), respectivamente, e o polimorfismo MPO-463G>A esteve associado com a ocorrência de infecções. Além disso, a presença concomitante do polimorfismo FcRIIA H/R131 com o MPO-463G>A, com o TLR4 896A>G, ou com o TNF-α influenciou a ocorrência de internações hospitalares, de sequestro esplênico, de AVE e do número de crises vaso-oclusivas. O estudo de novos marcadores de inflamação na anemia falciforme pode ajudar no entendimento da complexidade da fisiopatologia desta doença. Nossos dados enfatizam a identificação de novos biomarcadores genéticos e sua associação marcadores clássicos podem ser uma ferramenta importante para elucidar a diversidade fenotípica da HbSS.Sickle cell anemia (HbSS) is a genetic disease with elevated worldwide distribution characterized by clinical heterogeneity and acute and chronic complication presenting systemic inflammatory state. The immune system changes are related to infection predisposition in HbSS, exacerbated antibody production, changes in leucocytes function and innate immunity. It was included in this thesis a set of three manuscripts that aim to investigate genetic markers related to inflammation in HbSS emphasizing polymorphisms and cytokine serum levels of TNFα -308G>A and IL-8 251A>T, to the influence of genetic polymorphisms of TNFα-308G>A, FcRIIAH/R131, MPO-463G>A, TLR4 896A>G and TLR9- 1237T>C in infection and inflammatory complication in HbSS and the gene expression of dendritic cell TLR2, TLR4, TLR5 and TLR9 receptors. Our results shows high serum levels and the presence of TNFα and IL-8 mutant allele were related to disease clinical severity. The study of TLR9 -1237T>C and TLR4 896A>G polymorphisms were associated to respiratory infection and encephalic vascular accident (EVA), respectively, and the polymorphism MPO-463G>A was associated to infection. The double presence of polymorphism FcRIIA H/R131 with MPO-463G>A or with TLR4 896A>G or with TNF-α influence the presence of hospitalization, spleen sequestration, EVA and vasooclusive crisis. The new sickle cell anemia inflammation markers study may help to highlight the disease physiopathology complexity. Our finds emphasizes new genetic and immunological biomarkers identification and its association with classical markers may be important to elucidate phenotypic HbSS diversity

    NOTAS SOBRE EXPERIMENTOS COM CLONAGEM

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    Breve registro sobre a clonagem molecular de genes, utilizando um modelo experimental trabalhado durante o mestrado de uma das autoras. Repercussão da clonagem de mamíferos, utilizando como modelo de análise a recente produção da ovelha “Dolly”

    Sickle cell disease sc in northeast of Brazil: a clinical and molecular characterization

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    Submitted by Ana Maria Fiscina Sampaio ([email protected]) on 2014-07-14T19:01:17Z No. of bitstreams: 1 Cajado C Sickle cell disease....pdf: 207356 bytes, checksum: f18859107fb649a6d6863258f83798b5 (MD5)Made available in DSpace on 2014-07-14T19:01:17Z (GMT). No. of bitstreams: 1 Cajado C Sickle cell disease....pdf: 207356 bytes, checksum: f18859107fb649a6d6863258f83798b5 (MD5) Previous issue date: 2010Fundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilUniversidade Federal da Bahia. Faculdade de Farmácia. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasildoença SC é muito prevalente no Brasil, principalmente na Bahia, sendo que os pacientes apresentam anemia grave, mas com menos complicações clínicas que os homozigotos SS. Os pacientes com doença de SC têm menos crises dolorosas, infecções, comprometimento ósseo e priapismo. O objetivo do presente estudo foi realizar a caracterização clínica e molecular dos haplótipos ligados ao gene das globinas βS e βC e da talassemia α3,7Kb em 63 indivíduos com doença do SC da Bahia, Brasil. Os resultados obtidos demonstram que os pacientes estudados têm moderada anemia (média de hemoglobina=10,88g/ dL) e níveis discretamente elevados de hemoglobina fetal (média=3,06%). A talassemia α3,4Kb foi encontrada em 18 (28%) pacientes. Os haplótipos ligados aos genes da globina do gene da globina βS e βC mais frequentes foram CAR e Benin. Não foi encontrada associação entre os haplótipos da globina e eventos clínicos dos pacientes, porém estudos adicionais poderão confirmar os resultados obtidos com relação aos pacientes com doença SCThe SC disease is really prevalent in Brazil, mainly in Bahia, being that the patients present a severe anemia but with less clinical complications than SS homozygous. The patients with SC disease have less painful crisis, infections, skeletal involvement, anemia, and priapism. The aim of the present study was to investigate the hemoglobin C and S globin gene haplotypes distribution among 63 individual with SC disease from Northeast Brazil, associating with their phenotype. Our results show that the studied patients have mild anemia (hemoglobin median=10.88 g/ dL) and slightly high fetal hemoglobin levels (median=3.06%). The α-thalassemia3.4Kb deletion was found in 18 (28%) patients. The most frequent βC and βS globin gene haplotypes were CAR and Benin. We have not found any association among the globin haplotypes and clinical events of the patients, however further studies need to be developed to confirm the finding related to the SC disease patients

    IL-8 e TNF-alfa: marcadores imunológicos no prognóstico da anemia falciforme

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    Submitted by Ana Maria Fiscina Sampaio ([email protected]) on 2014-07-15T12:05:58Z No. of bitstreams: 1 Cajado CS Il-8 e tnf-alfa....pdf: 145037 bytes, checksum: 693244e9bbd68cf1683b2fefbf239a61 (MD5)Made available in DSpace on 2014-07-15T12:05:58Z (GMT). No. of bitstreams: 1 Cajado CS Il-8 e tnf-alfa....pdf: 145037 bytes, checksum: 693244e9bbd68cf1683b2fefbf239a61 (MD5) Previous issue date: 2010Fundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Laboratório de Patologia e Biologia Molecular. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Laboratório de Patologia e Biologia Molecular. Salvador, BA, BrasilUniversidade Estadual de Santa Cruz. Ilhéus, BA, BrasilFundação de Hematologia e Hemoterapia da Bahia. HEMOBA. Salvador, BA, BrasilUniversidade Federal da Bahia. Faculdade de Farmácia. Departamento de Análises Clínicas e Toxicológicas. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Laboratório de Patologia e Biologia Molecular. Salvador, BA, BrasilA hemoglobina S (HbS) possui frequência elevada no Brasil, sendo a Bahia o Estado com maior incidência da doença falciforme. A doença falciforme possui quadro clínico heterogêneo, caracterizado por episódios de vaso-oclusão e eventos infecciosos, aspectos que contribuem para a condição pró-inflamatória crônica descrita entre os seus portadores. O objetivo desse estudo foi investigar aspectos imunológicos e fenotípicos em indivíduos com anemia falciforme provenientes de Salvador, Bahia. O estudo foi desenvolvido em 126 pacientes, sendo 103 em estado clínico estável da doença e 23 hospitalizados por vaso-oclusão e/ou infecção. Foram investigados os polimorfismos -251T>A e -308G>A, localizados respectivamente nos genes da IL-8 e do TNF-alfa, por PCR e PCR-RFLP; os níveis séricos da IL-8 foram detectados por ELISA e a história clínica dos pacientes foi obtida dos prontuários médicos. Houve associação entre a presença do alelo mutante para o polimorfismo -308G>A e a ocorrência de sequestro esplênico (p<0,05). Interessantemente, os níveis séricos de IL-8 foram 32,3 + 43,3pg/ml no grupo de pacientes em crise permanecendo elevados após a alta hospitalar, diminuindo gradualmente. O alelo A do polimorfismo -251 foi associado aos níveis elevados de IL-8, independente do fator indutor. Juntos, nossos resultados mostraram a importância da interação dos marcadores de prognóstico no monitoramento dos portadores com anemia falciforme e a participação da IL-8 no processo de vaso-oclusão. Estudos adicionais são necessários para estabelecer o papel dos níveis de IL-8 e de TNF-alfa, bem como a presença de polimorfismos nesses genes, visando a sua utilização como marcadores de prognóstico no acompanhamento clínico desses indivíduos.Hemoglobin S (HbS) has a high prevalence in Brazil, the Bahia state with the highest incidence of sickle cell disease. Sickle cell disease is a clinical heterogeneous conditions characterized by episodes of vaso-occlusion and infectious events, aspects that contribute to the pro-inflammatory chronic state described among its carriers. The aim of this study was to investigate phenotypic and immunological aspects of patients with sickle cell anemia from Salvador, Bahia. The study was conducted in 126 patients, 103 in steady-state of the disease and 23 hospitalized for vaso-occlusion and / or infection. We investigated the polymorphisms -251T>A and-308G>A respectively located in the genes of IL-8 and TNF-alpha by PCR and PCR-RFLP; serum levels of IL-8 were detected by ELISA and the clinical history of patients was obtained from medical records. There was an association between the presence of the mutant allele A for the polymorphism -308G>A and occurrence of splenic sequestration (p<0.05). Interestingly, serum levels of IL-8 were 32.3 + 43.3 pg / ml. The A allele of -251 polymorphism of IL-8 gene was associated with elevated levels of IL-8, independent of the inducing factor. Together, our results showed the importance of the interaction of prognostic markers in the monitoring of patients with sickle cell anemia and the involvement of IL-8 at the process of vaso-occlusion. Additional studies are warranted to establish the role of interleukin-8 and TNF-alpha, and the presence of polymorphisms in these genes, in order to confirm their use as prognostic markers in the clinical follow up of these individuals

    Sickle cell disease: Only one road, but different pathways for inflammation

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    Submitted by Ana Maria Fiscina Sampaio ([email protected]) on 2016-05-05T14:05:12Z No. of bitstreams: 1 Vilas-Boas W Sickle cell....pdf: 350003 bytes, checksum: 79e235c0b9789d6e32decf101950f003 (MD5)Approved for entry into archive by Ana Maria Fiscina Sampaio ([email protected]) on 2016-05-05T14:19:11Z (GMT) No. of bitstreams: 1 Vilas-Boas W Sickle cell....pdf: 350003 bytes, checksum: 79e235c0b9789d6e32decf101950f003 (MD5)Made available in DSpace on 2016-05-05T14:19:11Z (GMT). No. of bitstreams: 1 Vilas-Boas W Sickle cell....pdf: 350003 bytes, checksum: 79e235c0b9789d6e32decf101950f003 (MD5) Previous issue date: 2012Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto Nacional de Ciência e Tecnologia do Sangue. São Paulo. SP, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto Nacional de Ciência e Tecnologia do Sangue. São Paulo. SP, Brasil / Universidade Estadual de Santa Cruz. Ilhéus, BA, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto Nacional de Ciência e Tecnologia do Sangue. São Paulo. SP, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto Nacional de Ciência e Tecnologia do Sangue. São Paulo. SP, Brasil / Universidade Federal da Bahia. Faculdade de Farmácia. Salvador, BA, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto Nacional de Ciência e Tecnologia do Sangue. São Paulo. SP, Brasil / Universidade Federal da Bahia. Faculdade de Farmacia. Salvador, BA, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto Nacional de Ciência e Tecnologia do Sangue. São Paulo. SP, Brasil.Instituto Nacional de Ciência e Tecnologia do Sangue. São Paulo. SP, Brasil / Universidade Federal da Bahia. Faculdade de Farmácia. Salvador, BA, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil / Instituto Nacional de Ciência e Tecnologia do Sangue. São Paulo. SP, Brasil / Universidade Federal da Bahia. Faculdade de Farmácia. Salvador, BA, Brasil.Sickle cell disease (SCD) is a genetic disorder charac- terized by a chronic inflammatory process, and new biomarkers have been studied as promising molecules for understanding the inflammation in its pathophy- siology. The hemolysis and the release of molecules associated to the hemoglobin (Hb) catabolism, such as free Hb, iron, and heme, generate an oxidant envi- ronment with production of reactive oxygen and ni- trogen species. The immune system plays a very im- portant role in the inflammation, with cells secreting pro-inflammatory cytokines and chemokines. There is also a nitric oxide (NO) resistance state, with an impaired NO bioactivity, leading to a vascular dys- function; activation of platelet, leukocytes, erythro- cytes, and endothelial cells, with expression of adhe- sion molecules and its ligands, and several receptors, that altogether participate at inflammatory process. During inflammation, there is an increase of dendritic cells (DCs) expressing toll like receptors (TLR), but the role of DCs and TLR in SCD pathogenesis is un-clear. Also, there are molecules contributing for en-hance the endothelium dysfunction, such as homo-cysteine that has been associated with vascular com-plications in the pathology of other diseases and it may contribute to the vascular complications pre-sented by SCD patients. Circulating microparticules (MPs) levels are augmented in several diseases and have been described in SCD, where cells membrane compounds are associated to cell’s thrombotic and coagulation state, such as tissue factor and phos-phatidylserine (PS), which may contribute to endo-thelial dysfunction. The knowledge of all these bio-markers may contribute to new therapeutic approach discover, improving SCD patient life quality

    TNF-alpha and IL-8: serum levels and gene polymorphisms (-308G>A and -251A>T) are associated with classical biomarkers and medical history in children with sickle cell anemia

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    Submitted by Ana Maria Fiscina Sampaio ([email protected]) on 2014-02-10T16:48:34Z No. of bitstreams: 1 Cajado, C. et al. TNF-alpha and...Cytokine 2011, v. 56, p. 312.pdf: 350357 bytes, checksum: 2b5756806e3783c08a408d0e9108bcd1 (MD5)Made available in DSpace on 2014-02-10T16:48:34Z (GMT). No. of bitstreams: 1 Cajado, C. et al. TNF-alpha and...Cytokine 2011, v. 56, p. 312.pdf: 350357 bytes, checksum: 2b5756806e3783c08a408d0e9108bcd1 (MD5) Previous issue date: 2011Fundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação de Hematologia e Hemoterapia do Estado da Bahia. HEMOBA. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasil / Universidade Federal da Bahia. Faculdade de Farmácia. Departamento de Análises Clínicas e Toxicológicas. Salvador, BA, BrasilSickle cell anemia (SCA) is a disorder characterized by a heterogeneous clinical outcome. In the present study, we investigated the associations between Tumor Necrosis Factor-alpha (TNF-alpha) 308G>A and Interleukin 8 (IL-8) 251A>T gene polymorphisms, medical history and classical biomarkers in children with steady-state SCA. In total, 210 SCA patients aged 2–21 years and 200 healthy controls were studied. Gene polymorphisms, betaS-globin haplotypes and a 3.7-kb deletion in alpha2-thalassemia (a2-thal3.7 kb) were investigated by PCR/RFLP analysis, and cytokine levels were determined by ELISA. Splenomegaly (p = .032) was more prevalent among children younger than 5 years of age. The A allele of the TNF-alpha 308G>A gene polymorphism and the presence of a2-thal3.7 kb were associated with an increase risk of splenic sequestration events (p = .001; p = .046), while the T allele of the IL-8 251A>T gene polymorphism was considered to be a protective factor for splenomegaly events (p = .032). Moreover, the A allele of the TNF-alpha 308G>A gene polymorphism was associated with high TNF-alpha levels (p = .021), and the hemoglobin F and hemoglobin S haplotypes were correlated with serum levels of IL-8. The logistic regression analysis showed significant effects of the TNF-alpha and IL-8 gene polymorphisms, betaS-globin gene haplotypes and a2-thal3.7 kb on the occurrence of splenic sequestration events. Our study emphasizes that the identification of new genetic and immunological biomarkers and their associations with classical markers is an important strategy to elucidate the underlying causes of different SCA phenotypes and their effects on patient outcom

    The beta-globin gene cluster haplotypes in sickle cell anemia patients from Northeast Brazil: a clinical and molecular view.

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    Submitted by Ana Maria Fiscina Sampaio ([email protected]) on 2012-10-30T21:04:13Z No. of bitstreams: 1 Adorno EV The beta-globin gene....pdf: 90461 bytes, checksum: b221e6ecf6fde7e0e2c44b2a6272708c (MD5)Made available in DSpace on 2012-10-30T21:04:13Z (GMT). No. of bitstreams: 1 Adorno EV The beta-globin gene....pdf: 90461 bytes, checksum: b221e6ecf6fde7e0e2c44b2a6272708c (MD5) Previous issue date: 2004Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil.Fundação de Hematologia e Hemoterapia da Bahia. Ambulatório de Hematologia. Salvador, BA, Brasil.Fundação de Hematologia e Hemoterapia da Bahia. Ambulatório de Hematologia. Salvador, BA, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil.Universidade Federal da Bahia. Campus Universitário de Ondina. Salvador, BA, Brasil.Universidade Federal da Bahia. Campus Universitário de Ondina. Salvador, BA, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil.Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil.The beta(S)-globin haplotypes were studied in 78 sickle cell Brazilian patients from Bahia, Northeast Brazil, that has a large population of African origin. Hemoglobin (Hb) profiles were developed by high-performance liquid chromatography (HPLC), and beta(S)-globin gene haplotypes were determined by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) techniques. We identified 44 (55.0%) patients with the CAR/Ben (Central African Republic/Benin) genotype, 16 (20.0%) Ben/Ben, 13 (16.2%) CAR/CAR and seven (8.8%) with other genotypes. Analyses of the phenotypes showed clinical differences related only to Hb F levels and blood transfusion therapy; the presence of -alpha(-3.7)-thalassemia (thal) demonstrated statistical significance when associated with hematocrit (p=0.044), MCV (p=0.0007), MCH (p=0.012) and spleen sequestration events. The haplotype diversity found in the present study can be justified by information about the origin of the slave traffic period in Bahia during the 19th century. The specific characteristics described among the Bahian sickle cell patients could be confirmed by increasing the number of patients with specific genotypes and further studies of genetic markers

    The leftward deletion 4.2 KB alpha-thalassemia in two sickle cell anemia siblings

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    Submitted by Ana Maria Fiscina Sampaio ([email protected]) on 2014-07-15T13:09:20Z No. of bitstreams: 1 Takahashi D The leftward....pdf: 91839 bytes, checksum: 163e2ec27a7eccbee29867ff6178021d (MD5)Made available in DSpace on 2014-07-15T13:09:21Z (GMT). No. of bitstreams: 1 Takahashi D The leftward....pdf: 91839 bytes, checksum: 163e2ec27a7eccbee29867ff6178021d (MD5) Previous issue date: 2010Fundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilUniversidade Federal da Bahia. Faculdade de Farmácia. Salvador, BA, BrasilFundação de Hematologia e Hemoterapia da Bahia. HEMOBA. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilUniversidade Federal da Bahia. Faculdade de Farmácia. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação de Hematologia e Hemoterapia da Bahia. HEMOBA. Salvador, BA, BrasilUniversidade Federal da Bahia. Faculdade de Farmácia. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilA presença da deleção –α thal 3.7Kb está associada com melhor prognóstico de pacientes que possuem anemia falciforme (AF), contudo não existem estudos na literatura a respeito da associação da –α thal 4.2Kb com a evolução clínica desses pacientes. No presente relato são descritos achados laboratoriais e perfil de hemoglobina de dois irmãos que possuem AF em associação com a –α thal 4.2Kb. Ambos os pacientes apresentam anemia acentuada, baixos índices de Volume Corpuscular Médio (VCM) e contagem de leucócitos elevada. Estudos adicionais são necessários para elucidar uma possível associação entre a –α thal 4.2Kb e a gravidade da AF.The presence of –αthal 3.7Kb deletion is associated with better prognosis of Sickle Cell Anemia (SCA) patients, but here are not reports in the literature regarding association of –α thal 4.2Kb and its importance among SCA clinical outcome. In this report, we describe Hemoglobin profile and laboratory findings of two siblings who have SCA and are silent carriers of –α thal 4.2Kb. Both described patients have severe anemia, lower rates of Mean Corpuscular Volume (MCV) and a high leukocytes count. Further studies are required to establish a possible association between –α thal 4.2Kb and SCA severity

    Role of paraoxonase 1 activity and PON1 gene polymorphisms in sickle cell disease

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    Abstract Sickle cell disease (SCD) patients often exhibit a dyslipidemic sub-phenotype. Paraoxonase 1 (PON 1) is a serum glycoprotein associated with the high-density lipoproteins cholesterol (HDL-C), and variability in PON1 activity depends on the PON1 genotypes. We investigated the influence of PON1c.192Q > R and PON1c.55L > M polymorphisms on PON1 activity and laboratory parameters and the association between PON1 activity and clinical manifestations in SCD patients. We recruited 350 individuals, including 154 SCD patients and 196 healthy volunteers, which comprised the control group. Laboratory parameters and molecular analyses were investigated from the participants' blood samples. We have found increased PON1 activity in SCD individuals compared to the control group. In addition, carriers of the variant genotype of each polymorphism presented lower PON1 activity. SCD individuals carrying the variant genotype of PON1c.55L > M polymorphism had lower platelet and reticulocyte counts, C-reactive protein, and aspartate aminotransferase levels; in addition to higher creatinine levels. SCD individuals carrying the variant genotype of PON1c.192Q > R polymorphism had lower triglyceride, VLDL-c, and indirect bilirubin levels. Furthermore, we observed an association between PON1 activity history of stroke and splenectomy. The present study confirmed the association between PON1c.192Q > R and PON1c.55L > M polymorphisms and PON1 activity, in addition to demonstrate their effects on markers of dislipidemia, hemolysis and inflammation, in SCD individuals. Moreover, data suggest PON1 activity as a potential biomarker related to stroke and splenectomy
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