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Effect of Simvastatin on the Generation of Autoantibodies Against Oxidized LDL and Progression of Atherosclerosis in Rabbits

CAVALLINI, Daniela C. U.; ABDALLA, Dulcineia S. P.; PAULY-SILVEIRA, Nadiege D.; ROSSI, Elizeu A.
Fonte: COLEGIO FARMACEUTICOS PROVINCIA DE BUENOS AIRES Publicador: COLEGIO FARMACEUTICOS PROVINCIA DE BUENOS AIRES
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.94%
Oxidized Low-Density Lipoproteins (oxLDL) and autoantibodies against oxLDL are important in the development of atherosclerotic lesions. Statins are efficacious in the control of dyslipidemia and prevention of atherosclerosis; however, many questions concerning the mechanism of action of such drugs remain unknown. This work investigated the effect of simvastatin on generation of autoantibodies against oxLDL and development of atherosclerosis in rabbits. The animals were divided into three groups: control, hypercholesterolemic, and hypercholesterolemic simvastatin (3.0 mg simvastatin/ kg body weight). Concentrations of autoantibodies against oxLDL were determined on days 0,30 and 60 of the experiment and the atherosclerotic lesions were evaluated at the end of the study. Simvastatin reduced intimal proliferation in the thoracic region, prevented arterial calcification and inhibited the generation of autoantibodies against oxLDL. In conclusion, daily administration of simvastatin slows down atherosclerotic lesion development in rabbits with induced hypercholesterolemia and inhibition on generation of autoantibodies against oxLDL contributes to the cardioprotective effect observed.; Amparo a Pesquisa do Estado de Sao Paulo - FAPESP

The spectrum of autoantibodies in IPEX syndrome is broad and includes anti-mitochondrial autoantibodies

TSUDA, Masanobu; TORGERSON, Troy R.; SELMI, Carlo; GAMBINERI, Eleonora; CARNEIRO-SAMPAIO, Magda; MANNURITA, Sara Ciullini; LEUNG, Patrick S. C.; NORMAN, Gary L.; GERSHWIN, M. Eric
Fonte: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD Publicador: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.94%
IPEX syndrome is a congenital disorder of immune regulation caused by mutations in the FOXP3 gene, which is required for the suppressive function of naturally arising CD4 + CD25 + regulatory T cells. In this case series we evaluated serum samples from 12 patients with IPEX syndrome for the presence of common autoantibodies associated with a broad range of autoimmune disorders. We note that 75% of patients (9/12) had 1 or more autoantibodies, an incidence far above the cumulative rate observed in the general population. The range of autoantibodies differed between patients and there was no predominant autoantibody or pattern of autoantibodies present in this cohort. Surprisingly, one patient had high-titer anti-mitochondrial antibodies (AMA) typically associated with primary biliary cirrhosis (PBC) although the patient had no signs of cholestasis. PBC is a well-characterized autoimmune disease that occurs primarily in women and includes the serological hallmarks of serum AMA and elevated IgM which were both present in this patient. PBC is virtually absent in children with the exception of one reported child with interleukin 2 receptor a (CD25) deficiency which is associated with an IPEX-like regulatory T cell dysfunction. Based on the present data and the available literature we suggest a direct role for CD4 + CD25 + regulatory T cells in restraining B cell autoantibody production and that defects in regulatory T cells may be crucial to the development of PBC. (C) 2010 Elsevier Ltd. All rights reserved.; National Institutes of Health (NIH)[DK39588]

Autoimmune disease and multiple autoantibodies in 42 patients with RASopathies

Quaio, Caio R. D. C.; Carvalho, Jozelio F.; da Silva, Clovis A.; Bueno, Cleonice; Brasil, Amanda S.; Pereira, Alexandre C.; Jorge, Alexander A. L.; Malaquias, Alexsandra C.; Kim, Chong A.; Bertola, Debora R.
Fonte: WILEY-BLACKWELL; MALDEN Publicador: WILEY-BLACKWELL; MALDEN
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.89%
The association of RASopathies [Noonan syndrome (NS) and Noonan-related syndromes] and autoimmune disorders has been reported sporadically. However, a concomitant evaluation of autoimmune diseases and an assessment of multiple autoantibodies in a large population of patients with molecularly confirmed RASopathy have not been performed. The clinical and laboratory features were analyzed in 42 RASopathy patients, the majority of whom had NS and five individuals had Noonan-related disorders. The following autoantibodies were measured: Anti-nuclear antibodies, anti-double stranded DNA, anti-SS-A/Ro, anti-SS-B/La, anti-Sm, anti-RNP, anti-Scl-70, anti-Jo-1, anti-ribosomal P, IgG and IgM anticardiolipin (aCL), thyroid, anti-smooth muscle, anti-endomysial (AE), anti-liver cytosolic protein type 1 (LC1), anti-parietal cell (APC), anti-mitochondrial (AM) antibodies, anti-liver-kidney microsome type 1 antibodies (LKM-1), and lupus anticoagulant. Six patients (14%) fulfilled the clinical criteria for autoimmune diseases [systemic lupus erythematous, polyendocrinopathy (autoimmune thyroiditis and celiac disease), primary antiphospholipid syndrome (PAPS), autoimmune hepatitis, vitiligo, and autoimmune thyroiditis]. Autoimmune antibodies were observed in 52% of the patients. Remarkably...

Autoantibodies and High-Risk HLA Susceptibility Markers in First-Degree Relatives of Brazilian Patients with Type 1 Diabetes Mellitus: A Progression to Disease Based Study

Alves, L. I.; Davini, E.; Correia, M. R.; Fukui, R. T.; Santos, R. F.; Cunha, M. R.; Rocha, D. M.; Volpini, W. M. G.; Silva, M. E. R.
Fonte: SPRINGER/PLENUM PUBLISHERS; NEW YORK Publicador: SPRINGER/PLENUM PUBLISHERS; NEW YORK
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.89%
The objective of this study was to determine the frequencies of autoantibodies to heterogeneous islet-cell cytoplasmic antigens (ICA), glutamic acid decarboxylase(65) (GAD(65)A), insulinoma-associated antigen-2 (IA-2A) and insulin (IAA)-and human leukocyte antigen (HLA) class II markers (HLA-DR and -DQ) in first degree relatives of heterogeneous Brazilian patients with type I diabetes(T1DM). A major focus of this study was to determine the influence of age, gender, proband characteristics and ancestry on the prevalence of autoantibodies and HLA-DR and -DQ alleles on disease progression and genetic predisposition to T1DM among the first-degree relatives. IAA, ICA, GAD(65)A, IA-2A and HLA- class II alleles were determined in 546 first-degree-relatives, 244 siblings, 55 offspring and 233 parents of 178 Brazilian patients with T1DM. Overall, 8.9% of the relatives were positive for one or more autoantibodies. IAA was the only antibody detected in parents. GAD(65) was the most prevalent antibody in offspring and siblings as compared to parents and it was the sole antibody detected in offspring. Five siblings were positive for the IA-2 antibody. A significant number (62.1%) of siblings had 1 or 2 high risk HLA haplotypes. During a 4-year follow-up study...

Organ-specific autoantibodies and autoimmune diseases in juvenile systemic lupus erythematosus and juvenile dermatomyositis patients

Aikawa, N. E.; Jesus, A. A.; Liphaus, B. L.; Silva, C. A.; Carneiro-Sampaio, M.; Viana, V. S. T.; Sallum, A. M. E.
Fonte: CLINICAL & EXPER RHEUMATOLOGY; PISA Publicador: CLINICAL & EXPER RHEUMATOLOGY; PISA
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.94%
Objectives To our knowledge, no study assessed simultaneously a variety of organ-specific autoantibodies and the prevalence of organ-specific autoimmune diseases in juvenile systemic lupus erythematosus (ISLE) and juvenile dermatomyositis (JDM). Therefore, the purpose of this study was to evaluate organ-specific autoantibodies and autoimmune diseases in JSLE and JDM patients. Methods Forty-one JSLE and 41 JDM patients were investigated for autoantibodies associated with autoimmune hepatitis, primary biliary cirrhosis, type I diabetes mellitus (TIDM, autoimmune thyroiditis (AT), autoimmune gastritis and coeliac disease (CD). Patients with positive antibodies were investigated for the respective organ-specific autoimmune diseases. Results Mean age at diagnosis was higher in ISLE compared to JDM patients (10.3 +/- 3.4 vs. 7.3 +/- 3.1 years, p=0.0001). The frequencies of organ-specific autoantibodies were similar in JSLE and JDM patients (p>0.05). Of note, a high prevalence of TIDM and AT autoantibodies was observed in both groups (20% vs. 15%, p=0.77 and 24% vs. 15%, p=0.41; respectively). Higher frequencies of ANA (93% vs. 59%, p=0.0006), anti-dsDNA (61% vs. 2%, p<0.0001), anti-Ro, anti-Sm, anti-RNP, anti-La and IgG-aCL were observed in JSLE (p<0.05). Organ-specific autoimmune diseases were evidenced only in ISLE patients (24% vs. 0%...

Avaliação do percentual de células Natural Killer e de auto-anticorpos em sangue periférico de pacientes com endometriose pélvica; Evaluation of the percentage of natural killer cells and autoantibodies in the peripheral blood of patients with pelvic endometriosis

Dias Junior, João Antonio
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 03/08/2010 PT
Relevância na Pesquisa
36.83%
Objetivo: o objetivo deste estudo foi avaliar a prevalência de autoanticorpos e a dosagem da concentração de células Natural Killer (NK) no sangue periférico em pacientes com endometriose. Métodos: Entre dezembro de 2004 e dezembro de 2007 foram avaliadas 155 pacientes submetidas a videolaparoscopia, divididas em um grupo sem endometriose(n=55) e outro com endometriose (n=100). Foi coletada amostra de sangue periférico de todas as pacientes no momento da laparoscopia e nessa amostra foi realizada a quantificação do percentual de células NK em relação aos linfócitos periféricos (por citometria de fluxo), e a determinação dos seguintes auto-anticorpos: anticorpos antinucleares (ANA, por imunofluorescência indireta), anticorpos antitireoglobulina e antiperoxidase (anti-TG e anti-TPO, por eletroquimioluminescência), anticorpos anticardilipina e antifosfatidilserina (aCL e aPS IgG, IgM e IgA, todos por ensaio imunoenzimático). Além da presença de endometriose, essas pacientes também foram avaliadas quanto ao estadiamento, os locais de doença, relações com a fase do ciclo, e a classificação histológica dessa doença. Resultados: as pacientes com endometriose apresentaram percentual de células NK (média DP de 15...

Autoanticorpos órgão-específicos e sistêmicos em pacientes com lúpus eritematoso sistêmico juvenil e dermatomiosite juvenil; Organ-specific and systemic autoantibodies in patients with juvenile systemic lupus erythematosus and juvenile dermatomyositis

Aikawa, Nádia Emi
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 29/03/2011 PT
Relevância na Pesquisa
36.94%
Objetivo: Ao nosso conhecimento, não há estudos na literatura avaliando simultaneamente um grande número de autoanticorpos órgãoespecíficos, bem como a prevalência de doenças autoimunes órgãoespecíficas em populações com lúpus eritematoso sistêmico juvenil (LESJ) e dermatomiosite juvenil (DMJ). Portanto, o objetivo deste estudo foi avaliar autoanticorpos e doenças autoimunes órgão-específicas em pacientes com LESJ e DMJ. Métodos: Quarenta e um pacientes com LESJ e 41 com DMJ foram investigados para os autoanticorpos séricos associados com hepatite autoimune, cirrose biliar primária, diabetes melito tipo 1 (DM1), tireoidite autoimune, gastrite autoimune e doença celíaca. Pacientes com positividade para anticorpos órgão-específicos foram avaliados para a presença das respectivas doenças autoimunes órgão-específicas. Resultados: A média de idade ao diagnóstico foi significativamente maior em pacientes com LESJ em comparação com DMJ (10,3 ± 3,4 vs. 7,3 ± 3,1 anos, p=0,0001), enquanto a média de duração da doença foi similar em ambos os grupos (p=0,92). As freqüências de autoanticorpos órgão-específicos foram semelhantes nos pacientes com LESJ e DMJ (p>0,05). Notavelmente, uma alta prevalência de autoanticorpos relacionados a tireoidite autoimune e DM1 e foi observada em ambos os grupos (20% vs. 15%...

Estudo da região promotora do gene da interleucina (IL-21) e do poliformismo do gene tirosina fosfatase, tipo não receptor 22 (PTPN22): associação com auto-anticorpos em pacientes portadores de diabetes mellitos tipo 1A; Allelic variant in IL21 promoter region, C1858T PTPN22 frequency and autoantibodies in Brazilian type 1A diabetes patients

Novo, Debora Teixeira de Oliveira Mainardi
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 11/08/2011 PT
Relevância na Pesquisa
36.89%
As citocinas têm papel importante como mediadores através das respostas imunológicas. A Interleucina-21, importante regulador dos linfócitos T e B, é produzida por linfócitos CD4 ativados, e está implicada na patogênese do diabetes autoimune em modelo animal, o NOD. A região promotora da IL-21, que contempla sítios de controle da expressão gênica em camundongos, o NFATc2, T-bet e c-MAF, foi estudada pela primeira vez em humanos portadores de diabetes tipo 1A, neste trabalho. Foi analisado também a freqüência do polimorfismo C1858T do gene PTPN22, que tem sido associado em estudos recentes como fator de risco importante para diabetes tipo1A e outras doenças autoimunes. Associou-se ainda, autoanticorpos pancreáticos e não-pancreáticos em diabéticos e grupo controle normal, e estes resultados foram analisados com ambos os genes. Foram estudados 612 DM1A e 792 indivíduos do grupo controle. Após extração de DNA genômico, a região 5proximal da região promotora do gene da Il-21, -448+83pb, foi seqüenciada em 309 brasileiros diabéticos tipo 1A e 189 indivíduos do grupo controle. A genotipagem do polimorfismo C1858T do gene PTPN22, por RFLP, foi realizada em 434 diabéticos e 689 controles, bem como os alelos HLA-DRB1. Foi encontrada uma variação alélica...

Effect of Simvastatin on the Generation of Autoantibodies Against Oxidized LDL and Progression of Atherosclerosis in Rabbits

Cavallini, Daniela C. U.; Abdalla, Dulcineia S. P.; Pauly-Silveira, Nadiege D.; Rossi, Elizeu Antonio
Fonte: Colegio Farmaceuticos Provincia de Buenos Aires Publicador: Colegio Farmaceuticos Provincia de Buenos Aires
Tipo: Artigo de Revista Científica Formato: 1419-1424
ENG
Relevância na Pesquisa
36.94%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Oxidized Low-Density Lipoproteins (oxLDL) and autoantibodies against oxLDL are important in the development of atherosclerotic lesions. Statins are efficacious in the control of dyslipidemia and prevention of atherosclerosis; however, many questions concerning the mechanism of action of such drugs remain unknown. This work investigated the effect of simvastatin on generation of autoantibodies against oxLDL and development of atherosclerosis in rabbits. The animals were divided into three groups: control, hypercholesterolemic, and hypercholesterolemic simvastatin (3.0 mg simvastatin/ kg body weight). Concentrations of autoantibodies against oxLDL were determined on days 0,30 and 60 of the experiment and the atherosclerotic lesions were evaluated at the end of the study. Simvastatin reduced intimal proliferation in the thoracic region, prevented arterial calcification and inhibited the generation of autoantibodies against oxLDL. In conclusion, daily administration of simvastatin slows down atherosclerotic lesion development in rabbits with induced hypercholesterolemia and inhibition on generation of autoantibodies against oxLDL contributes to the cardioprotective effect observed.

Autoantibodies and High-Risk HLA Susceptibility Markers in First-Degree Relatives of Brazilian Patients with Type 1 Diabetes Mellitus: A Progression to Disease Based Study

Alves, L. I.; Davini, E.; Correia, M. R.; Fukui, R. T.; Santos, R. F.; Cunha, M. R.; Rocha, D. M.; Volpini, W. M. G.; Silva, M. E. R.
Fonte: Springer; New York Publicador: Springer; New York
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.83%
The objective of this study was to determine the frequencies of autoantibodies to heterogeneous islet-cell cytoplasmic antigens (ICA), glutamic acid decarboxylase(65) (GAD(65)A), insulinoma-associated antigen-2 (IA-2A) and insulin (IAA)-and human leukocyte antigen (HLA) class II markers (HLA-DR and -DQ) in first degree relatives of heterogeneous Brazilian patients with type I diabetes(T1DM). A major focus of this study was to determine the influence of age, gender, proband characteristics and ancestry on the prevalence of autoantibodies and HLA-DR and -DQ alleles on disease progression and genetic predisposition to T1DM among the first-degree relatives. IAA, ICA, GAD(65)A, IA-2A and HLA- class II alleles were determined in 546 first-degree-relatives, 244 siblings, 55 offspring and 233 parents of 178 Brazilian patients with T1DM. Overall, 8.9% of the relatives were positive for one or more autoantibodies. IAA was the only antibody detected in parents. GAD(65) was the most prevalent antibody in offspring and siblings as compared to parents and it was the sole antibody detected in offspring. Five siblings were positive for the IA-2 antibody. A significant number (62.1%) of siblings had 1 or 2 high risk HLA haplotypes. During a 4-year follow-up study...

Autoantibodies in relatives of celiac disease patients: a follow-up of 6-10 years

Nass,Flávia Raphaela; Kotze,Lorete Maria; Nisihara,Renato M.; Messias-Reason,Iara Taborda de; Utiyama,Shirley R. da Rosa
Fonte: Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologia - IBEPEGE ; Colégio Brasileiro de Cirurgia Digestiva - CBCD ; Sociedade Brasileira de Motilidade Digestiva - SBMD ; Federação Brasileira de Gastroenterologia - FBG; Sociedade Brasileira de Hepatologia - SBH; Sociedade Brasileira de Endoscopia Digestiva - SOBED Publicador: Instituto Brasileiro de Estudos e Pesquisas de Gastroenterologia - IBEPEGE ; Colégio Brasileiro de Cirurgia Digestiva - CBCD ; Sociedade Brasileira de Motilidade Digestiva - SBMD ; Federação Brasileira de Gastroenterologia - FBG; Sociedade Brasileira de Hepatologia - SBH; Sociedade Brasileira de Endoscopia Digestiva - SOBED
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2012 EN
Relevância na Pesquisa
36.97%
CONTEXT: Autoimmune diseases are 3 to 10 times more frequently in patients with celiac disease and their relatives than in the general population. OBJECTIVE: To investigate a broad spectrum of autoantibodies in celiac disease relatives from Southern Brazil, in a serological follow-up of 6-10 years, aiming to associate with other autoimmune diseases, degree of parentage, demographic and clinical data. METHODS: Serum samples of 233 relatives were analyzed in two different phases: n = 186 in phase I (1997-2000) and n = 138 (being 91 = follow-up group and 47 = newly tested) in phase II (2006-2007). As controls, 100 unrelated individuals were evaluated. Autoantibodies to smooth muscle, mitochondrial, liver-kidney microssome, parietal cell and thyroid microssome were tested by indirect immunofluorescence. RESULTS: A significant increase of autoantibodies, in both phases, was observed in the relatives when compared to the non-relatives (P = 0.0064), specifically to anti-thyroid microssome and anti-parietal cell. In both phases, the female/male proportion of autoantibodies was of 4:1 to 3:1 (P<0.041). The frequency of autoantibodies amongst 1st and 2nd degree relatives was 11.8% and 9.68% in phase I and 4% and 6.67% in phase II. CONCLUSION: Celiac disease relatives presented other autoantibodies and serological screening is a useful instrument for identifying autoimmune diseases along the years.

Autoantibodies before, during and after administration of recombinant interferon-alpha for chronic viral hepatitis

Lopes,Edmundo P.A.; Silva,A. Eduardo; Sette Junior,Hoel; Guimarães,Rubens X.; Ferraz,M. Lucia
Fonte: Instituto de Medicina Tropical Publicador: Instituto de Medicina Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/1995 EN
Relevância na Pesquisa
36.89%
This study was undertaken to investigate the presence of autoantibodies in patients with chronic viral hepatitis B and C, before, during and after interferon-alpha (IFN-alpha) therapy and to study their relation to dose and type of IFN-alpha and response to treatment. Fifty patients with chronic hepatitis were divided in two groups, a control-group of 21 patients (10 type B and 11 type C) who were followed for 6 months without treatment and an IFN-group consisting of 29 patients (8 type B and 21 type C) who received IFN therapy for 6 months. Serum samples were tested for a range of antibodies at the start of the study, during therapy and at the end of the 6 month period. Antibodies tested for included: antinuclear, smooth muscle, antimitochondrial, parietal cell and thyroid microsomal. Four (8%) of the total patient group had autoantibodies at the beginning of the study (two in each group). During the follow-up period no patient in the control group developed antibodies compared with 3 (11%) patients in the treatment group. Autoantibodies developed in patients treated with higher doses of IFN and were found in those patients who tended to show a poor response to IFN-therapy. Further studies are needed to establish the relationship between poor response to IFN-alpha and development of autoantibodies.

Prevalence of antinuclear autoantibodies in the serum of normal blood dornors

Fernandez,Solange Assuncion Villagra; Lobo,Alice Zoghbi Coelho; Oliveira,Zilda Najjar Prado de; Fukumori,Ligia Maria Ichimura; Périgo,Alexandre Marques; Rivitti,Evandro A.
Fonte: Faculdade de Medicina / Universidade de São Paulo - FM/USP Publicador: Faculdade de Medicina / Universidade de São Paulo - FM/USP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2003 EN
Relevância na Pesquisa
36.83%
OBJECTIVE:To examine the presence of serum antinuclear autoantibodies in a healthy population. METHODS: Serum of 500 normal blood donors between 18 and 60 years of age were tested for the presence of autoantibodies. Antinuclear antibodies were detected by indirect immunofluorescence technique using HEp-2 epithelial cells as the substrate. The presence of dnaN was detected by indirect immunofluorescence technique using Critidia lucillae as the substrate. Anti-SSA (RO), anti-SSB (LA), anti-Sm, and anti-RNP were determined by double radial immunodiffusion. RESULTS: In the evaluation of the presence of serum antibodies, antinuclear antibodies were detected in 22.6% of the sera. The presence of other antibodies was not significant. The majority of the titers were 1:40. CONCLUSION: The presence of autoantibodies is not necessarily pathologic and has to be related to the age group, gender, and clinical condition of the patient.

Frequency of islet cell autoantibodies (IA-2 and GAD) in young Brazilian type 1 diabetes patients

Pardini,V.C.; Mourão,D.M.; Nascimento,P.D.; Vívolo,M.A.; Ferreira,S.R.G.; Pardini,H.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/1999 EN
Relevância na Pesquisa
36.83%
Type 1 diabetes, as an autoimmune disease, presents several islet cell-specific autoantibodies such as islet cell antibody (ICA), anti-insulin, anti-glutamic acid decarboxylase (GAD) and the antibody (Ab) against tyrosine phosphatase (PTP)-like protein known as ICA-512 (IA-2). In order to determine the frequency of the anti-GAD and anti-IA-2 autoantibodies in Brazilian type 1 diabetes patients we studied 35 diabetes mellitus (DM) type 1 patients with recent-onset disease (£12 months) and 37 type 1 diabetes patients with long-duration diabetes (>12 months) who were compared to 12 children with normal fasting glucose. Anti-GAD65 and anti-IA-2 autoantibodies were detected with commercial immunoprecipitation assays. The frequency of positive results in recent-onset DM type 1 patients was 80.0% for GADAb, 62.9% for IA-2Ab and 82.9% for GADAb and/or IA-2Ab. The long-duration type 1 diabetes subjects presented frequencies of 54.1% for GADAb and IA-2Ab, and 67.5% for GAD and/or IA-2 antibodies. The control group showed no positive cases. Anti-GAD and IA-2 assays showed a high frequency of positivity in these Brazilian type 1 diabetes patients, who presented the same prevalence as a Caucasian population.

A pseudobiospecific hollow fiber cartridge for in vitro adsorption of autoantibodies from pathological serum

Ventura,R.C.A.; Zollner,R.L.; Legallais,C.; Vijayalakshmi,M.A.; Bueno,S.M.A.
Fonte: Brazilian Society of Chemical Engineering Publicador: Brazilian Society of Chemical Engineering
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2000 EN
Relevância na Pesquisa
36.89%
The affinity filtration technique using histidine as a pseudobiospecific ligand immobilized on poly(ethylene vinyl alcohol) hollow fiber membranes (His-PEVA) was used to remove autoantibodies from serum of patients with autoimmune disease. The effects of buffering solution conditions on the efficiency of autoantibodies removal was studied. The removal of anti-dsDNA, anti-SS-A/Ro, anti-Sm, anti-Sm/RNP and anti-cardiolipin autoantibodies present in the serum was investigated, comparing the efficiency between Hepes and Tris-HCl buffers. The results showed the potential of the membrane to remove all the autoantibodies studied. Anti SS-A/Ro was removed more efficiently in Tris-HCl buffer system rather than with the Hepes buffer.

Clinical heterogeneity and prognostic features of South Australian patients with anti-synthetase autoantibodies

Dugar, M.; Cox, S.; Limaye, V.; Blumbergs, P.; Roberts-Thomson, P.
Fonte: Blackwell Publishing Asia Publicador: Blackwell Publishing Asia
Tipo: Artigo de Revista Científica
Publicado em //2011 EN
Relevância na Pesquisa
37%
Aims: To determine the clinical, serological and prognostic features of patients with autoantibodies against three aminoacyl-transfer RNA synthetases (ARS), namely Jo-1 (histidyl-tRNA synthetase), PL-7 (threonyl-tRNA synthetase) and PL-12 (alanyl-tRNA synthetase) in South Australia. Methods: Patients with autoantibodies against ARS detected by line immunoassay (anti-Jo1, anti-PL7, anti-PL12) or enzyme-linked immunosorbent assay (anti-Jo1) were identified from existing laboratory databases for the period 1994 to 2009. Demographic, clinical and serological data were obtained by retrospective review of patients’ medical records and laboratory databases. Results: Forty two patients with autoantibodies were identified (anti-Jo1=37, anti-PL7=4, anti-PL12=1). Females were more commonly affected than males (M:F=12:30). Twenty one patients had polymyositis (anti-Jo1=17, anti-PL7=4), seven dermatomyositis (anti-Jo1=6, anti-PL12=1), ten overlap syndrome (anti-Jo1=10; lupus=4, scleroderma=3, Sjögren’s syndrome=2 and rheumatoid arthritis=2) and four had interstitial lung disease (ILD) only (anti-Jo1=4). ILD was present in 69%, polyarthritis in 59% and positive anti-nuclear antibody (ANA) in 43% of patients. Concurrence of autoantibodies against Ro-52 with Jo-1 was seen in twelve patients. The mean follow up period was 8.3 years (95% CI 5.8-10.8) with twelve deaths. Poor prognostic indicators were age of onset > 60 years (p=0.001)...

A three-way interplay of DR4, autoantibodies and synovitis in biopsy-proven idiopathic inflammatory myositis

Limaye, V.; Lester, S.; Bardy, P.; Thompson, P.; Cox, S.; Blumbergs, P.; Roberts-Thomson, P.
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
Publicado em //2012 EN
Relevância na Pesquisa
36.97%
The aim of this study was to determine the HLA and autoantibody associations of patients with histologically confirmed idiopathic inflammatory myositis (IIM). Serum and DNA were archived from South Australian patients with biopsy-proven dermatomyositis (DM), polymyositis (PM) and inclusion body myositis (IBM). HLA typing for Class I and II alleles was performed by serology and DNA-based technology, respectively, for 133 myositis patients and 166 Caucasian population-based controls. Myositis-specific and myositis-associated autoantibodies were detected by line immunoblot. All alleles of the 8.1AH were associated with myositis susceptibility. The B8-DR3 haplotype fragment conferred the strongest susceptibility (OR 2.9, 95% CI 1.8–4.6), and the B-DR region of other ancestral haplotypes was associated with myositis subgroups. Autoantibodies were present in 42/130 (32%) IIM patients and were more frequent in DM (11/17, 65%) than PM (23/70, 33%) or IBM (8/43, 19%), P = 0.002. Autoantibodies were associated with DRB1*03 (P = 0.0005) but also with DRB1*04 (P = 0.004). The frequency of autoantibodies in the three myositis subgroups mirrored the frequency of DR4. Polyarthralgia (±synovitis) was more common in DM/PM (30/76, 39%) than IBM (3/32...

Assessing the Activity of Agonistic Autoantibodies in Systemic Sclerosis and their Effects on Cultured Vascular Smooth Muscle Cells

Chokr, Nidaa
Fonte: Université de Montréal Publicador: Université de Montréal
Tipo: Thèse ou Mémoire numérique / Electronic Thesis or Dissertation
EN
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La sclérose systémique (ScS) est une maladie auto-immune dévastatrice d'étiologie inconnue. Le dysfonctionnement immunitaire, la fibrose et la vasculopathie sont les trois principales caractéristiques de cette maladie. Une récente étude a révélé un nouveau lien entre l'auto-immunité et la fibrose, par la présence d'auto-anticorps stimulant le récepteur du facteur de croissance dérivé des plaquettes (PDGFR) des fibroblastes. Ces auto-anticorps sont capables de stimuler les espèces réactives de l'oxygène et d’activer la kinase régulée par un signal extracellulaire (ERK1/2). L’hypothèse que nous formulons est que les cellules musculaires lisses vasculaires (VSMCs) exprimant conjointement les PDGFR, répondront elles aussi aux autoanticorps anti-PDGF-R. Le travail présenté ici vise à valider la présence d'auto-anticorps PDGFR dans les sérums de patients ScS, et à caractériser ensuite la réponse de VSMCs exposées à de l'immunoglobuline G (IgG) de ces sérums, en mesurant l’activation des cascades de signalisation spécifiques, ainsi que l'induction des gènes impliqués dans la réponse fibrotique. Nos résultats démontrent la présence d'une fraction IgG stimulant une réponse phénotypique dans les cultures de VSMCs. Notamment...

Sclera-Specific and non-sclera-specific autoantibodies in the serum of patients with non-infectious anterior scleritis

Aragaki,Wagner Koji; Sousa,Luciene Barbosa de; Trevisani,Virgínia Fernandes Moça; Fuzzi,Hellen; Andrade,Luís Eduardo Coelho
Fonte: Sociedade Brasileira de Reumatologia Publicador: Sociedade Brasileira de Reumatologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2007 EN
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OBJECTIVES: to study the frequency and specificity of sclera-specific and non-sclera-specific autoantibodies in the sera of patients with anterior non-infectious scleritis. METHODS: prospective study involving 25 patients examined at the sector of Cornea and External Disease of the Department of Ophthalmology and Immuno-Rheumatology Laboratory at Federal University of São Paulo/Paulista Medicine School, during one year. The diagnosis of scleritis was according to Watson and Hayreh's (1976) classification criteria. The exclusion criterion was infectious scleritis. All the patients underwent a full clinical and ophthalmologic evaluation, including serological tests for syphilis and tuberculosis investigation. The following autoantibodies were tested: rheumatoid factor, antinuclear antibodies, anticardiolipin antibodies, ANCA (anti-neutrophil cytoplasmic antibodies), anti-SS-A/Ro, anti-SS-B/La, anti-Sm, anti-DNA and anti-APF (antiperinuclear factor). For sclera-specific autoantibodies, sera of all patients were subjected to indirect immunofluorescence and Western blot assays, using human sclera from eye banks as a substrate. Sera from 25 healthy individuals were used as a normal control in the immunologic assays. RESULTS: as non-sclera-specific autoantibodies we detected one patient with positive rheumatoid factor...

Estudo dos auto-anticorpos nas Hepatites virais crônicas B e C antes, durante e após tratamento com Interferon-alfa; Autoantibodies before, during and after administration of recombinant interferon-alpha for chronic viral hepatitis

Lopes, Edmundo P.A.; Silva, A. Eduardo; Sette Junior, Hoel; Guimarães, Rubens X.; Ferraz, M. Lucia
Fonte: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo Publicador: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/10/1995 ENG
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Este estudo teve como objetivo avaliar a presença de auto-anticorpos em pacientes com hepatite crônica pelos vírus B e C, antes, durante e após tratamento com interferon-alfa (IFN-alfa), assim como estudar a relação destes anticorpos com o tipo de IFN, com a dose e com a resposta terapêutica. Cinqüenta pacientes com hepatite viral crônica foram divididos em 2 grupos: grupo-controle constituído por 21 pacientes (10 hepatites B e 11 hepatites C), que foram seguidos durante 6 meses sem tratamento e grupo-IFN constituído por 29 pacientes (8 hepatites B e 21 hepatites C), que receberam IFN-alfa durante 6 meses. Anticorpos antinúcleo, antimúsculo liso, antimitocôndria, anticélula parietal e antitireóide foram pesquisados em amostras de soro colhidas antes do início, durante e ao final do estudo. Quatro dos 50 pacientes (8%) apresentavam auto-anticorpos no início do estudo (2 em cada grupo). Durante o estudo nenhum paciente do grupo-controle desenvolveu auto-anticorpos, enquanto que 3 (11%) pacientes do grupo-IFN passaram a apresentá-los. Os auto-anticorpos ocorreram apenas em pacientes tratados com doses mais elevadas de IFN. Verificou-se ainda tendência à resposta desfavorável ao tratamento naqueles indivíduos que apresentaram ou desenvolveram auto-anticorpos. Assim...