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| Chiarella,J.M.; Goldberg,A.C.; Abel,L.; Carvalho,E.M.; Kalil,J.; Dessein,A.. |
| Six hundred million people are at risk of infection by Schistosoma mansoni. MHC haplotypes have been reported to segregate with susceptibility to schistosomiasis in murine models. In humans, a major gene related to susceptibility/resistance to infection by S. mansoni (SM1) and displaying the mean fecal egg count as phenotype was detected by segregation analysis. This gene displayed a codominant mode of inheritance with an estimated frequency of 0.20-0.25 for the deleterious allele and accounted for more than 50% of the variance of infection levels. To determine if the SM1 gene segregates with the human MHC chromosomal region, we performed a linkage study by the lod score method. We typed for HLA-A, B, C, DR and DQ antigens in 11 informative families from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: HLA; Linkage study; Human schistosomiasis. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000500010 |
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| Bittencourt,P.L.; Palácios,S.A.; Couto,C.A.; Cançado,E.L.R.; Carrilho,F.J.; Laudanna,A.A.; Kalil,J.; Gayotto,L.C.C.; Goldberg,A.C.. |
| The hemochromatosis gene, HFE, is located on chromosome 6 in close proximity to the HLA-A locus. Most Caucasian patients with hereditary hemochromatosis (HH) are homozygous for HLA-A3 and for the C282Y mutation of the HFE gene, while a minority are compound heterozygotes for C282Y and H63D. The prevalence of these mutations in non-Caucasian patients with HH is lower than expected. The objective of the present study was to evaluate the frequencies of HLA-A antigens and the C282Y and H63D mutations of the HFE gene in Brazilian patients with HH and to compare clinical and laboratory profiles of C282Y-positive and -negative patients with HH. The frequencies of HLA-A and C282Y and H63D mutations were determined by PCR-based methods in 15 male patients (median... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hemochromatosis; HFE mutations; Iron overload; HLA-A3 mutation; C282Y mutation; H63D mutation; Chromosome 6. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000300007 |
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| Cunha-Neto,E.; Rizzo,L.V.; Albuquerque,F.; Abel,L.; Guilherme,L.; Bocchi,E.; Bacal,F.; Carrara,D.; Ianni,B.; Mady,C.; Kalil,J.. |
| The hallmark of chronic Chagas' disease cardiomyopathy (CCC) is the finding of a T cell-rich inflammatory mononuclear cell infiltrate in the presence of extremely few parasites in the heart lesions. The scarcity of parasites in affected heart tissue casts doubt on the direct participation of Trypanosoma cruzi in CCC heart tissue lesions, and suggests the possible involvement of autoimmunity. The cells in the infiltrate are presumably the ultimate effectors of tissue damage, and there is evidence that such cells recognize cardiac myosin in molecular mimicry with T. cruzi proteins rather than primary reactivity to T. cruzi antigens (Cunha-Neto et al. (1996) Journal of Clinical Investigation, 98: 1709-1712). Recently, we have studied heart-infiltrating T... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Trypanosoma cruzi; Chagas' disease cardiomyopathy; Immunology; Cytokines; Gamma-interferon. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000100018 |
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| Vallochi,A.L.; Yamamoto,J.H.; Schlesinger,D.; Machado,M.A.C.; Silveira,C.; Martins,M.C.; Belfort Jr.,R.; Kalil,J.; Rizzo,L.V.. |
| Toxoplasma gondii is an obligatory intracellular parasite whose life cycle may include man as an intermediate host. More than 500 million people are infected with this parasite worldwide. It has been previously reported that T. gondii contains a superantigen activity. The purpose of the present study was to determine if the putative superantigen activity of T. gondii would manifest towards human T cells. Peripheral blood mononuclear cells (PBMC) from individuals with no previous contact with the parasite were evaluated for proliferation as well as specific Vß expansion after exposure to Toxoplasma antigens. Likewise, PBMC from individuals with the congenital infection were evaluated for putative Vß family deletions in their T cell repertoire. We also... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Toxoplasma; Tolerance; Superantigen; T cell receptor. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000800008 |
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| Goldberg,A.C.; Chiarella,J.M.; Marin,M.L.C.; Rosales,C.; Banic,D.; Oliveira,M.A.; Rodrigues,H.; Viggiani,C.S.; Kalil,J.. |
| In the present paper we show data obtained from a normal population with a racially mixed profile typical of the city of São Paulo, State of São Paulo. Data were generated with polymerase chain reaction using sequence specific primers (PCR-SSP) for HLA-DRB and polymerase chain reaction followed by hybridization with sequence specific oligonucleotide probes (PCR-SSO) for HLA-DQA1 and HLA-DQB1 loci. HLA-DRB, DQA1, DQB1 and haplotype frequencies as well as common linkage disequilibria were found. This population was also shown to be in genetic equilibrium according to the Hardy-Weinberg law. HLA-DR typing of a normal sample from the city of Porto Velho, State of Rondonia, highlighted the importance of different sets of HLA profiles found in other regions of... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000300001 |
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| Teixeira,P.C.; Iwai,L.K.; Kuramoto,A.C.K.; Honorato,R.; Fiorelli,A.; Stolf,N.; Kalil,J.; Cunha-Neto,E.. |
| Chronic Chagas' disease cardiomyopathy (CCC) is an often fatal outcome of Trypanosoma cruzi infection, with a poorer prognosis than other cardiomyopathies. CCC is refractory to heart failure treatments, and is the major indication of heart transplantation in Latin America. A diffuse myocarditis, plus intense myocardial hypertrophy, damage and fibrosis, in the presence of very few T. cruzi forms, are the histopathological hallmarks of CCC. To gain a better understanding of the pathophysiology of CCC, we analyzed the protein profile in the affected CCC myocardium. Homogenates from left ventricular myocardial samples of end-stage CCC hearts explanted during heart transplantation were subjected to two-dimensional electrophoresis with Coomassie blue staining;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chagas' disease; Cardiomyopathy; Proteomic analysis; Two-dimensional electrophoresis; MALDI-ToF. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006001200005 |
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