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‣ Estudo da associação entre antígenos de histocompatibilidade leucocitária (HLA) e pênfigo vulgar em pacientes brasileiros; Study of the association between HLA antigens and Pemphigus Vulgaris in brazilian patients

Weber, Raimar
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 09/12/2010 Português
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INTRODUÇÃO: O Pênfigo Vulgar é uma doença bolhosa crônica que acomente pele e mucosas. A perda de adesão epitelial ocorre por agressão autoimune às desmogleínas presentes nos desmossomos, mediada por anticorpos IgG. Estudos sobre a gênese da autoimunidade no pênfigo indicam associação entre alelos do sistema HLA, especialmente dos loci DR e DQ. A população brasileira apresenta características favoráveis a estudos exploratórios em genética decorrente de sua origem mista e intensa miscigenação. PACIENTES E MÉTODO: O grupo em estudo incluiu trinta e seis pacientes não consanguíneos com diagnóstico de Pênfigo Vulgar comprovado por imunopatologia provenientes do estado de São Paulo, Brasil. Foram tipados para os loci HLA-A, HLA-B e HLA-DR utilizando-se oligonucleotídeos sequência-específica (PCR-SSO). As frequências alélicas e fenotípicas encontradas foram comparadas com as de um grupo controle composto de dados de 712 indivíduos doadores voluntários cadastrados no Registro Nacional de Doadores de Medula Óssea (REDOME) provenientes de São Paulo e tipados pelo mesmo método. O valor de P crítico foi corrigido utilizando-se o método False Discovery Rate. RESULTADOS: Os alelos HLA-DRB1*04:02, DRB1*08:04 e DRB1*14 estiveram associados à doença com riscos relativos de 44...

‣ Fatores genéticos na psoríase glossite migratória benígna: Revisão da literatura sobre a associação com o complexe HLA

Gonzaga, H. F S; Torres, E. A.; Cardoso, A. L P; Ramalho, R. B.; Alohorne, M. M A; Gerbase-de-Lima, M.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 82-88
Português
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The genetics of psoriasis and benign migratory glossitis has relationship with the major HLA. The authors reviewed the literature about the association between HLA with psoriasis and benign migratory glossitis. HLA-Cw6 presents a particularly strong association, irrespective of different racial or ethnic groups, suggesting that Cw6 itself, or a closely linked gene in strong linkage disequilibrium, is the major HLA-linked susceptibility gene for psoriasis. The white Brazilian population shows the established associations between psoriasis and the HLA antigens Cw6, B13 and B17 reported in several Caucasian populations, and shows association between benign migratory glossitis and HLA-Cw6.

‣ Prevalence of HLA antibodies in post pregnancies female blood donors

Barra, A; Barradas, A; Cardoso, E; Costa, C; Fontes, A; Gil, A; Oliveira, C; Ramalhete, L; Rodrigues, T; Sancho, MR; Silva, I; Simões, A; Trindade, H
Fonte: International Society for Blood Transfusion Publicador: International Society for Blood Transfusion
Tipo: Conferência ou Objeto de Conferência
Publicado em //2011 Português
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Background: Transfusion related acute lung injury (TRALI) is known as transfusion hazard with high morbidity and mortality rate. Mainly HLA class II have been associated with TRALI. Preventive measures are in the exclusion of donor female as they carry any these antibodies. Aim: We study a group of female blood donor with prior history of two or more pregnancies (G2), one (G1) pregnancy and without any pregnancy (G0) for detection of HLA antibodies. Methods: We collected a total of 108 samples between September and December of 2010 (G2-56; G1-19 and G0-33 samples). For detection of HLA antibodies we used the LABScreen Mixed Assay which is multiplex technique that detects anti HLA Class I and II 1gG antibodies. Microparticles (beads) are coated with HLA antigens. Those beads have a combination of two dyes, and for each set of beads the dyes proportions are different so that the bead sets can be distinguished. Positivity was defined when the ratio is equal or higher than 4. Results: In the totality of the 108 study samples we found positivity for HLA class I antibodies in 22% (G2-32%, G1-26%, G0-3%) and for HLA class II antibodies in 17% of samples (G2-27%, G1-5%, and G0-6%). Positivity for both HLA class I and II antibodies was found only in G2 samples (18%) and G1 samples (5%). Our study also shows a 12% of positivity only for HLA class I antibodies (G2-14%...

‣ HLA class I haplotypes and progression of primary open-angle glaucoma

Zenha,Fábio; Castadelli,Rosistele Maria Oliveira Bezerra; Deghaide,Neifi Hassam Saloum; Donadi,Eduardo Antonio; Rodrigues,Maria de Lourdes Veronese
Fonte: Conselho Brasileiro de Oftalmologia Publicador: Conselho Brasileiro de Oftalmologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2011 Português
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PURPOSE: To verify if patients with primary open-angle glaucoma with HLA class I haplotypes (A9-B12, A2-B40, A1-B8) associated with this disease may have a greater rate of progression than patients who do not present these haplotypes. METHODS: Anatomical and functional glaucoma evaluation (cup-to-disc ratio and visual field) of 25 patients (six of them with one of the haplotypes associated with glaucoma) followed at the Glaucoma Outpatient Clinic of the University Hospital, Ribeirão Preto School of Medicine, São Paulo University (HCFMRP-USP) for ten years after typing of their HLA antigens in order to compare with their previous condition. RESULTS: A greater increase of the cup-to-disc ratio was observed in patients with HLA haplotypes associated with primary open-angle glaucoma predisposition. However, no significant differences in functional damage progression or in retinal nerve fibers loss were detected between them and other patients with glaucoma. CONCLUSION: The present results indicate an association of class I HLA haplotypes with progression of anatomic alterations of the optic nerve head in glaucomatous patients.

‣ Idiopathic focal segmental glomerulosclerosis and HLA antigens

Gerbase-DeLima,M.; Pereira-Santos,A.; Sesso,R.; Temin,J.; Aragão,E.S.; Ajzen,H.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/1998 Português
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The objective of the present study was to investigate a possible association between HLA class II antigens and idiopathic focal segmental glomerulosclerosis (FSGS). HLA-A, -B, -DR and -DQ antigens were determined in 19 Brazilian patients (16 white subjects and three subjects of Japanese origin) with biopsy-proven FSGS. Comparison of the HLA antigen frequencies between white patients and white local controls showed a significant increase in HLA-DR4 frequency among FSGS patients (37.7 vs 17.2%, P<0.05). In addition, the three patients of Japanese extraction, not included in the statistical analysis, also presented HLA-DR4. In conclusion, our data confirm the association of FSGS with HLA-DR4 previously reported by others, thus providing further evidence for a role of genes of the HLA complex in the susceptibility to this disease

‣ HLA and skin cancer

Bonamigo,Renan Rangel; Carvalho,André Vicente Esteves de; Sebastiani,Vanessa Raquel Zaleski; Silva,Cristina Martino da; Pinto,Angela Caroline de Zorzi
Fonte: Sociedade Brasileira de Dermatologia Publicador: Sociedade Brasileira de Dermatologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2012 Português
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Skin cancer - melanoma and non melanoma - are common neoplasm with rising incidence over the last decades. It is an important public health problem. Its pathogenesis is not completely understood and the same happens with the genetic factors involved. The genes that encode the HLA are associated with some tumors and they may be responsible for one of the mechanisms that take part in the development of the before mentioned cancers. We have reviewed the literature on the subject of HLA antigens, melanoma and non melanoma skin cancer.

‣ Association of HLA antigens and BCR-ABL transcripts in leukemia patients with the Philadelphia chromosome

Carvalho,Daiana Landenberger de; Barbosa,Cristian Dias; Carvalho,André Luiz de; Beck,Sandra Trevisan
Fonte: Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular Publicador: Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2012 Português
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OBJECTIVE: This study aimed to verify the association between human leukocyte antigens and the bcr-abl fusion protein resulting from t(9;22)(q34;q11) in chronic leukemia myeloid and acute lymphoblastic leukemia patients. METHODS: Forty-seven bcr-abl positive individuals were evaluated. Typing was performed bymicrolymphocytotoxicity and molecular biological methods (human leukocyte antigens Class I and Class II). A control group was obtained from the data of potential bone marrow donors registered in the Brazilian Bone Marrow Donor Registry (REDOME). RESULTS: Positive associations with HLA-A25 and HLA-B18 were found for the b2a2 transcript, as well as a tendency towards a positive association with HLA-B40 and a negative association with HLA-A68. The b3a2 transcript showed positive associations with HLA-B40 and HLA-DRB1*3. CONCLUSION: The negative association between human leukocyte antigens and the BCR-ABL transcript suggests that binding and presentation of peptides derived from the chimeric protein are effective to increase a cytotoxic T lymphocyte response appropriate for the destruction of leukemic cells.

‣ Structure of HLA antigens: amino-acid and carbohydrate compositions and NH2-terminal sequences of four antigen preparations.

Terhorst, C; Parham, P; Mann, D L; Strominger, J L
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /03/1976 Português
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Amino-acid and carbohydrate compositions in addition to limited NH2-terminal sequence data of four preparations of HLA antigens, including products of both of the major histocompatibility loci (HLA-A and HLA-B), show that the antigens have great homology in the primary structure. A striking observation is that HLA antigens also have a considerable structure homology with mouse H-2 antigens. HLA antigens appear to have one carbohydrate side chain which has the same composition in all four cases. The possible relation of the structure of the heavy chain of HLA antigens to immunoglobulins is discussed, based on the limited data which are available so far.

‣ A study of the specificity of the direct binding between bacteria and HLA antigens.

Maeda, K; Kono, D; Kobayashi, S; Brenner, M B; Yu, D T
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /09/1984 Português
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In the first step of the present study we re-examined the question whether HLA class I molecules isolated from human lymphocytes can bind to intact bacteria. HLA antigens were isolated from the lymphoblastoid cell line HOM-2 and incubated with the bacteria Yersina enterocolitica. Significant binding of antigens to the bacteria was detected whether the antigens were solubilized in the detergent NP 40, reconstituted in liposomes or presented as papain cleaved molecules. Next, we studied the specificity of the binding. We compared the ability of NP 40 solubilized HLA antigens derived from four different cell lines, expressing different HLA-A, -B and -C antigens, to bind to nine different strains of bacteria. Remarkably, few differences were found in that each strain of bacteria bound 10-30% of the HLA antigens derived from any of the four cells lines. Further, after a sample of HLA antigens had been incubated with one strain of bacteria, the unbound HLA antigens would fail to bind to another strain. The conclusions are as follows. First, we have confirmed a previous report that HLA class I antigens could bind to bacteria. Second, binding to bacteria is mediated through the extracellular portion of the HLA molecules which is not affected by papain cleavage. Third...

‣ Shared HLA antigens and reproductive performance among Hutterites.

Ober, C L; Martin, A O; Simpson, J L; Hauck, W W; Amos, D B; Kostyu, D D; Fotino, M; Allen, F H
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /09/1983 Português
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Shared histocompatibility antigens between spouses may affect reproductive outcome adversely as a result of prenatal selection against compatible fetuses. Evidence from both animal and human studies suggest that histocompatible fetuses may not initiate a maternal immunologic response that prevents rejection of the embryo. Therefore, parents sharing HLA antigens may produce compatible fetuses and consequently experience a greater frequency of early fetal losses and show poorer reproductive outcome than couples not sharing antigens. In the Hutterites, an inbred human isolate that proscribes contraception, we tested the hypothesis that couples sharing HLA antigens have poorer reproductive outcomes than couples who do not. The Hutterites are characterized by high fertility and large family sizes. Couples that share zero (no. = 21), one (no. = 15), and more than one (no. = 10) HLA-A or HLA-B antigens were compared for reproductive performance. Median intervals between births were larger among couples that share more than one antigen in eight of 11 intervals examined. In addition, the median intervals from marriage to first, fifth, and tenth birth were consistently larger among couples that share more than one antigen. Differences among the groups appear to become larger with increasing parity...

‣ HLA antigens in colorectal tumours--low expression of HLA class I antigens in mucinous colorectal carcinomas.

van den Ingh, H. F.; Ruiter, D. J.; Griffioen, G.; van Muijen, G. N.; Ferrone, S.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /02/1987 Português
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Expression of HLA antigens and beta 2-microglobulin was studied by immunoperoxidase staining of frozen sections of 9 mucinous and 10 nonmucinous colorectal adenocarcinomas, 1 cloacogenic carcinoma, 12 colorectal adenomas and 4 samples of normal colorectal mucosa using monoclonal antibodies (MAbs). Staining results were related to histopathological features. HLA Class I antigens were strongly expressed in morphologically normal colorectal epithelium, in all adenomas tested and in all non-mucinous carcinomas. In contrast, expression of HLA class I antigens by the majority of tumour cells was present in only 2 of the 9 mucinous carcinomas, whereas 2 of these mucinous carcinomas were completely negative. In the mucinous carcinomas a striking scarcity of mononuclear inflammatory infiltrate, especially around the mucus accumulations, was observed. HLA class II antigen expression was not detected in normal epithelium and was only focally present in 1 of the 12 adenomas. In 6 out of the 20 carcinomas tested between 20% and 90% of the tumour cells were stained by MAbs against HLA class II antigens. Apart from the low expression of HLA class I antigens in mucinous carcinomas no relationship was found between expression of HLA antigens and histological features of the tumours. The relative poor prognosis of mucinous colorectal carcinoma as reported in the literature may be associated with low expression of HLA class I antigens and scant mononuclear inflammatory infiltrate...

‣ Human cytotoxic T-cell responses to type A and type B influenza viruses can be restricted by different HLA antigens. Implications for HLA polymorphism and genetic regulation

Fonte: The Rockefeller University Press Publicador: The Rockefeller University Press
Tipo: Artigo de Revista Científica
Publicado em 01/01/1980 Português
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The present study compares human cytotoxic T-cell responses to two closely related viruses (type A and type B influenza) to understand the antigen-specific elements involved in HLA-linked genetic control of cytotoxic T-cell responses. The HLA antigens function as self antigens that are recognized by cytotoxic T cells sensitized against either virus. However, studies in an informative family indicate that in this family, the HLA antigens preferentially recognized in conjunction with type A influenza (A/HK) differ from the HLA antigens preferentially recognized in conjunction with type B influenza (B/HK). Similarly, population studies demonstrate that some (but not all) donors whose T cells recognized A/HK in conjunction with HLA-A2 failed to recognize B/HK in conjunction with HLA-A2. Thus, HLA-linked regulation must operate by a mechanism(s) that is specific both for the self HLA antigen and the viral antigen. Furthermore, these findings indicate that different HLA antigens may facilitate T-cell responses to different pathogens, which would result in an evolutionary advantage for HLA heterozygosity.

‣ THE PREVALENCE OF HLA DQ2 AND DQ8 IN PATIENTS WITH CELIAC DISEASE, IN FAMILY AND IN GENERAL POPULATION

CECILIO,Lucila Arantes; BONATTO,Mauro W.
Fonte: Colégio Brasileiro de Cirurgia Digestiva Publicador: Colégio Brasileiro de Cirurgia Digestiva
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2015 Português
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Background:Celiac disease is an enteropathy characterized by gluten sensitivity and broad clinical aspect. Has a multifactorial cause and depends on genetic, immunological and environmental factors for its development. The genetic influence is given mostly by the human leukocyte antigens HLA DQ2 and DQ8. Aim: To evaluate the prevalence of human leukocyte antigens DQ2 and DQ8 in three different groups: patients with celiac disease, first-degree relatives and the general population.Method:Retrospective analysis that evaluated serologic and endoscopic data of 74 patients with celiac disease and 109 non-celiac, which were subdivided into two subgroups: non-celiac who had first-degree relatives with celiac and non-celiac who did not. All patients underwent laboratory examination for screening genetic sensitivity given by HLA DQ2 and HLA DQ8 by.Results:The presence of HLA DQ2 and DQ8 was identified in 98,4% of 74 celiac patients, of which 79,7% had only HLA DQ2; 8,1% had only HLA DQ8 and 10,8% had both antigens histocompatibility. In the group of relatives of celiac patients, were included 29 patients; among them, 89,6% had HLA DQ2 and/or DQ8; 76% only the HLA DQ2, 10,3% only HLA DQ8 and 3,4% presented both human leukocyte antigens (HLA).Conclusion:HLA DQ2/DQ8 was present in 98...

‣ HLA antigens in Japanese populations.

Yasuda, N; Tsuji, K; Aizawa, M; Itakura, K; Inou, T
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /07/1976 Português
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HLA antigens in 841 healthy, unrelated Japanese from nine widely separated geographic localities were studied. The five most common antigens observed in order of decreasing frequency were for the HLA-A locus: HLA-A9, A2, A10, AW32 and A11; and for the HLA-B locus: HLA-'B5' (= HLA-B5+B17), BW40, B12, B14 and B8. The allelic frequency of undetected antigens of the HLA-A locus was .14-.37, and that of the HLA-B locus, .32-.67, indicating that there were serological difficulties in typing for Japanese antigens using antisera from Caucasians. Marked gene frequency clines were observed for HLA-A9 and HLA-A2 from south (Okinawa) to north (Nagoya). Two haplotypes, HLA-A9, B5 and HLA-A10, BW40 were shown to be in linkage disequilibrium in four of the nine subpopulations.

‣ Identification, characterization, and quantitation of soluble HLA antigens in the circulation and peritoneal dialysate of renal patients.

Gelder, F B; McDonald, J C; Landreneau, M D; McMillan, R M; Aultman, D F
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /06/1991 Português
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Human lymphocyte antigen (HLA) class I and class II antigens and beta 2 microglobulin (B2M) were identified in peritoneal dialysate (PD) and serum from patients with end-stage renal disease (ESRD) using monoclonal antibodies in an enzyme-linked immunoassay. The HLA class I and class II antigens each exhibited approximate molecular weights of 50,000 to 60,000 daltons by chromatography on Sepharose CL 6B. Class I antigens in serum and PD fluid were associated with B2M. Free B2M (Mr 11,500) also was detected in both sera and PD fluids. Unlike class I antigens, class II antigens were not found to have attached B2M. Class I and class II antigens eluted from 2-diethylaminoethanol ion exchange gradient columns at 0.07 mol/L (molar) phosphate buffer pH 7.2 and migrated with alpha 2-beta 1 mobility in agarose electrophoresis. Class I antigens were purified from ESRD patients' PD fluid by solid-phase immunoaffinity chromatography. Enzyme-linked immunoassay demonstrated that this purified protein was composed of a class I heavy chain and B2M. Class I allospecificity was confirmed by neutralization on known HLA typing antisera in a microcytotoxicity assay. Soluble HLA class I antigen preparations specifically inhibited blast transformation of responder lymphocytes in mixed lymphocyte culture reactions. Inhibition was dose dependent and ranged from 0% to 95%. The presence of soluble HLA antigens in body fluids may play an important part in the immunologic tolerance to self. This study demonstrates a ready source of large quantities of soluble HLA for detailed analysis.

‣ Association of Alport's syndrome with HLA-DR2 antigen in a group of unrelated patients

Donadi,E.A.; Voltarelli,J.C.; Paula-Santos,C.M.; Kimachi,T.; Ferraz,A.S.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/1998 Português
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A few family studies have evaluated HLA antigens in Alport's syndrome; however, there are no large population studies. In the present report, we studied 40 unrelated white patients with Alport's syndrome seen at the Unit of Renal Transplantation, Faculty of Medicine of Ribeirão Preto, São Paulo, Brazil. HLA-A, -B, -DR and -DQ antigens were typed using a complement-dependent microlymphocytotoxicity assay. A control white population (N = 403) from the same geographical area was also typed for HLA antigens. Although the frequencies of HLA-A and -B antigens of patients were not statistically different from controls, the frequency of HLA-DR2 antigen observed in patients (65%) was significantly increased in relation to controls (26%; P<0.001). The relative risk and etiologic fraction for HLA-DR2 antigen were 5.2 and 0.525, respectively. Although few immunological abnormalities have been shown in Alport's syndrome, in this report we emphasize the association of HLA molecules and Alport's syndrome. Besides the well-known inherited molecular defects encoded by type IV collagen genes in Alport's syndrome, the major histocompatibility alleles may be in linkage disequilibrium with these defective collagen genes

‣ Heterotopic ossification in patients with traumatic medullar injury: association with HLA-system antigens

Castro,Anita Weigand de; Greve,Júlia Maria D'Andréa
Fonte: Sociedade Brasileira de Ortopedia e Traumatologia Publicador: Sociedade Brasileira de Ortopedia e Traumatologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2003 Português
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The purpose of this study was to identify the prevalence of the human leukocyte antigen (HLA) class I and II on the spinal cord injury (SCI) patients and its relation with heterotopic ossification (HO). Fifty-four patients were studied (47 men and 7 women) with an average age of 33,5 ± 12,5 years (range 18 to 59 years) with SCI. Forty-four patients (81,5%) had complete and 10 had incomplete lesions. Twenty-three patients (42,6%) were tetraplegics, 31(57,4%) were paraplegics, 28 had thoracic injury and 3 had lumbar lesion. The tests used in the diagnosis of HO were bone scintigraphy, anteroposterior radiography of hip and knee in the paraplegics and also the shoulders in the tetraplegics. Computerized tomography was used when the others tests were unconcluded. The patients were divided in two groups: 28 patients with HO (52%) and 26 without HO (48%). The typing of HLA antigens class I and II was done in all patients. The results of the distribution of frequency of HLA antigens were assessed on both groups and it was not shown any difference with statistic significance. It was conclude that there was no association between HLA antigens class I and II with the OH development.

‣ FREQÜÊNCIA DOS ANTÍGENOS DE HISTOCOMPATIBILIDADE NA POPULAÇÃO NORMAL DA REGIÃO NORDESTE DO ESTADO DE SÃO PAULO BRASIL; FREQUENCY OF HISTOCOMPATIBITY ANTIGENS IN THE NORMAL POPULATION OF THE NORTHEAST REGION OF THE STATE OF SÃO PAULO BRAZIL;

Donadi, Eduardo A.; Silva, Luís Maurício; Santos, Cássia M. Paula; Silveira, Rubens D.; Deghaide, Neifi H.S.; Ferraz, Agenor S.; Voltarelli, Júlio C.
Fonte: Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto Publicador: Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 30/03/2000 Português
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Modelo de estudo: estudo de prevalência. Objetivos: avaliação das freqüências dos antígenos de histocompatibilidade de classe I (HLA-A, -B e -C) e de classe II (HLA-DR e -DQ) na população de indivíduos saudáveis da região nordeste do Estado de São Paulo. Metodologia: foram estudados três grupos de indivíduos saudáveis, o de funcionários do Hospital de Clínicas e da Faculdade de Medicina de Ribeirão Preto, o de doadores do Banco de Sangue local e o de doadores cadáveres de órgãos sólidos do São Paulo Interior Transplante. Os antígenos HLA foram tipificados, utilizando-se método de microlinfocitotoxicidade-dependente de complemento. Resultados: as freqüências dos antígenos de histocompatibilidade de classe I ou II, usualmente detectados entre os três grupos estudados, foram semelhantes. Conclusões: as populações de indivíduos saudáveis estudadas refletem adequadamente o perfil imunogenético da população da região nordeste do Estado de São Paulo, podendo esses dados ser utilizados para estudos de seleção de doadores em transplantes, e, também, naqueles de associação com doenças.; ; Type of study : prevalence study. Objectives: to evaluate the frequency of class I and class II histocompatibity antigens in the normal population of the Northeast region of the State of São Paulo...

‣ FREQÜÊNCIA DOS ANTÍGENOS HLA-DR E DQ EM PACIENTES BRASILEIROS COM DIABETES MELLITUS TIPO I; FREQUENCY OF HLA CLASS II DR AND DQ ANTIGENS IN BRAZILIAN PATIENTS WITH TYPE I DIABETES

Nahas, Renata; Deghaide, Neifi H.S.; Donadi, Eduardo A.; Foss, Milton C.
Fonte: Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto Publicador: Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 30/03/2000 Português
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A associação entre diabetes mellitus do tipo I com os genes HLA de classe II está bem estabelecida. Os genes podem ser diferentes de acordo com a etnia do grupo estudado. Neste estudo, foram tipificados os antígenos HLA de classe II em uma população brasileira de pacientes com diabetes do tipo I. Para tal, foram estudados 58 pacientes diabéticos e 102 indivíduos sadios, procedentes da mesma área geográfica e com etnia semelhante à dos pacientes. Os linfócitos B foram separados, utilizando-se lã de nylon. Os antígenos HLA foram tipificados por intermédio de um método de microlinfocitotoxicidade dependente de complemento. A análise estatística foi realizada pelo teste exato de Fisher bicaudal. As freqüências dos antígenos HLA-DR3 e HLA-DR4 e as combinações dos antígenos HLA-DR3 e DR4 estavam significantemente elevadas nos pacientes (P < 0,05). As freqüências dos antígenos HLA-DQ2 e HLA-DQ3 não foram significantemente diferentes daquelas observadas em controles, quando analisadas separadamente, no entanto, as freqüências das combinações dos antígenos HLADR3 com HLA-DQ3, HLA-DR4 com HLA-DQ2 ou HLA-DQ3, e, ainda, HLA-DR3, HLA-DR4 com HLA-DQ3 estavam significantemente elevadas nos pacientes diabéticos (P < 0...

‣ ANTÍGENOS HLA NA FEBRE REUMÁTICA; RHEUMATIC FEVER AND HLA ANTIGENS

Donadi, Eduardo A.; Lamparelli, Paula P.C.; Figueiredo, Lídia Z.; Paula-Santos, Cássia M.; Voltarelli, Julio C.
Fonte: Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto Publicador: Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 30/03/2000 Português
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Antígenos HLA de classe I (HLA-A e HLA-B) e II (HLA-DR) foram tipificados em um grupo de 91 pacientes com as principais formas de apresentação da febre reumática, ou seja, coréia, cardite ou artrite. Desses pacientes, 33 tinham apenas coréia, 26 apenas cardite, 16 apenas artrite e 16 cardite e artrite. Os antígenos HLA foram tipificados, utilizando-se o teste de microlinfocitotoxicidade dependente de complemento. As freqüências dos antígenos HLA-B49 e HLA-DR1 estavam significantemente aumentadas nos pacientes, quando considerados como um todo, e, ainda, em todos os subgrupos estudados, excetuando-se aquele com coréia, no qual a freqüência do antígeno HLA-DR1 não estava aumentada. Esses resultados indicam que a susceptibilidade imunogenética à febre reumática pode variar de acordo com as manifestações clínicas, apresentadas pelos pacientes.; In this study we typed HLA class I and II antigens in a series of patients presenting with the distinct major clinical manifestations of rheumatic fever (RF), i.e, chorea, carditis or arthritis. Ninety-one patients with RF were evaluated for HLA-A, -B and -DR antigens. Thirty- three had pure chorea, 26 pure carditis, 16 pure arthritis, and 16 carditis plus arthritis. HLA antigens were typed by a complement-dependent microlymphocytotoxicity assay. HLA-B49 and HLA-DR1 antigens were overrepresented in the total group of patients with RF and in all the subgroups studied...