Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 10 de 10
Filter
1.
Genet. mol. biol ; 33(3): 442-444, 2010. tab
Article in English | LILACS | ID: lil-555835

ABSTRACT

Pemphigus foliaceus is an organ-specific autoimmune disease characterized by autoantibodies against the extracellular region of desmoglein 1, a protein that mediates intercellular adhesion in desmosomes. Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) is a key negative regulator of the T cell immune response, playing an important role in T cell homeostasis and maintenance of peripheral tolerance. Polymorphisms in the CTLA4 gene have been associated with autoimmune diseases and the functional CT60 single nucleotide polymorphism (rs3087243, also named 6230G > A) has been proposed to be a casual variant in several of these diseases. The aim of this study was to ascertain whether this polymorphism is associated with inter-individual variation in susceptibility to pemphigus foliaceus. The population sample in this case-control association study comprised 248 patient and 367 controls. We did not found a significant association of pemphigus foliaceus with the CT60 variants. We conclude that the CTLA4 CT60 polymorphism is not an important factor for pemphigus foliaceus pathogenesis in the population analyzed.


Subject(s)
Humans , Male , Female , Infant, Newborn , Infant , Child, Preschool , Child , Adolescent , Adult , Middle Aged , Aged, 80 and over , Autoimmune Diseases , Pemphigus/genetics , Brazil , Disease Susceptibility , Genotype , Polymorphism, Genetic , Polymorphism, Restriction Fragment Length
2.
Indian J Dermatol Venereol Leprol ; 2007 Jul-Aug; 73(4): 240-2
Article in English | IMSEAR | ID: sea-53099

ABSTRACT

BACKGROUND: Pemphigus autoantibodies have been reported in healthy relatives of pemphigus patients suggesting a genetic predisposition in the pathogenesis of the disease. AIMS: To test for the presence of pemphigus autoantibodies in healthy relatives of Turkish patients of pemphigus. METHODS: The study group comprised 45 pemphigus patients, 75 unaffected family members and 47 healthy individuals in the control group. Direct and indirect immunofluorescence techniques were performed to determine the presence of pemphigus autoantibodies. RESULTS: By indirect immunofluorescence staining, circulating pemphigus autoantibodies were found in 26.7% of the relatives and in only two of the controls (P value = 0.0001). A direct immunofluorescence technique revealed positive results in three (4%) of the relatives and none of the controls. CONCLUSION: The presence of pemphigus autoantibodies in clinically healthy relatives indicates that genetic predisposition is necessary but not sufficient for the development of clinical disease.


Subject(s)
Adult , Aged , Autoantibodies/blood , Biopsy , Female , Fluorescent Antibody Technique , Genetic Predisposition to Disease , Humans , Immunoglobulin G/blood , Male , Middle Aged , Pemphigus/genetics , Skin/immunology , Turkey
3.
Braz. j. med. biol. res ; 39(9): 1227-1232, Sept. 2006. tab
Article in English | LILACS | ID: lil-435423

ABSTRACT

Endemic pemphigus foliaceus (EPF) is an autoimmune bullous skin disease characterized by acantholysis and antibodies against a desmosomal protein, desmoglein 1. Genetic and environmental factors contribute to development of this multifactorial disease. HLA class II and some cytokine gene polymorphisms are the only genetic markers thus far known to be associated with susceptibility to or protection from EPF. The cytotoxic T-lymphocyte antigen-4 gene (CTLA4) encodes a key immunoreceptor molecule that regulates and inhibits T-cell proliferation. It participates in the regulatory process controlling autoreactivity and therefore has been considered a strong candidate gene in autoimmune diseases. In the search for genes that might influence EPF pathogenesis, we analyzed variants of the CTLA4 gene in a sample of 118 patients and 291 controls from a Brazilian population. This is the first study investigating the possible role of polymorphisms of the 2q33 chromosomal region in differential susceptibility to pemphigus foliaceus. Promoter region and exon 1 single nucleotide polymorphisms -318 (C,T) and 49 (A,G) were genotyped using sequence-specific oligonucleotide probes after amplification by the polymerase chain reaction. The allelic and genotypic frequencies did not differ significantly between the patient and the control groups (-318T: 9.8 and 10.9 percent, 49G: 33.0 and 35.2 percent were the allelic frequencies in patients and controls, respectively). In addition, no significant difference was found when the patient and control population samples were stratified by the presence of HLA-DRB1 alleles. We conclude that the CTLA4 -318 (C,T) and 49 (A,G) polymorphisms do not play a major role in EPF development.


Subject(s)
Humans , Antigens, CD/genetics , Antigens, Differentiation/genetics , Exons/genetics , HLA-DR Antigens/genetics , Promoter Regions, Genetic , Pemphigus/genetics , Polymorphism, Genetic/genetics , Brazil , Case-Control Studies , Endemic Diseases , Genetic Markers , Genetic Predisposition to Disease , Genotype , Gene Frequency/genetics , Polymerase Chain Reaction
4.
Medicina (B.Aires) ; 59(1): 28-32, 1999. tab
Article in Spanish | LILACS | ID: lil-231906

ABSTRACT

El pénfigo vulgar (PV) es una enfermedad cutaneomucosa que se caracteriza por la presencia de autoanticuerpos dirigidos contra la desmogléína 3, causando acantolisis y formación de ampollas. En el presente estudio se analiza la asociación de los antígenos HLA DR y HLA DQ en 30 pacientes caucásicos argentinos que padecen esta enfermedad comparada con una población control (N = 199) del mismo grupo étnico. La técnica utilizada fue PCR SSO. Los resultados muestran una asociación con HLA DR 4 (RR = 3.80, P = 0.001) y HLA DR 14 (RR = 5.97, P = 0.0001). En el caso de los subtipos moleculares DrBeta1 y DQBeta1, los que están positivamente asociados con PV pertencen a 2 alelos diferentes, tal como en otras poblaciones. El primero es DRBeta1 0402 (RR = 44.70, P = 10.7) y DQBeta1 0302 (RR = 71.82, P = 10.7) y el segundo es DRBeta1 1401 (RR = 117.94, P = 10.7) y DQBeta1 0503 (RR = 86.95, P = 10.7).


Subject(s)
Humans , HLA-DQ Antigens/blood , HLA-DR Antigens/blood , Pemphigus/genetics , Pemphigus/immunology , Polymerase Chain Reaction/methods , Alleles , Prospective Studies , Risk
6.
An. bras. dermatol ; 72(6): 533-7, nov.-dez. 1997. tab, graf
Article in Portuguese | LILACS | ID: lil-217806

ABSTRACT

FUNDAMENTOS - O pênfigo foliáceo é doença bolhosa, auto-imune, com características endêmicas no Brasil e em outros países da América do Sul. OBJETIVOS - Correlacionar os dados clínicos e epidemiológicos observados e os referidos na literatura. MÉTODO - Realizado estudo restrospectivo sobre portadores de pênfigo foliáceo atendidos no Hospital das Clínicas da Faculdade de Medicina de Botucatu, SP, no período de junho/76 a julho/93, com análise das variáveis idade, sexo, cor, procedência, profissäo, época de adoecimento. RESULTADOS - Nesse período, foram atendidos 63 doentes, em média 3,7 casos/ano; a faixa etária mais freqüentemente atingida foi a dos vinte aos sessenta anos, sendo a maioria dos doentes (77,8 porcento) de raça branca, e o sexo feminino foi pouco mais afetado do que o masculino. A maioria dos doentes do sexo masculino relatou atividades na lavoura, e a das mulheres, atividades domésticas. Quanto à procedência, foi bem variada, sem detecçäo de áreas de endemia, a maior parte proveniente da zona rural; houve tendência a adoecerem mais no veräo e outono. Verificou-se ocorrência de casos semelhantes em familiares consangüíneos e vizinhos. CONCLUSAO - Os dados observados no presente trabalho concordam com os da literatura


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Pemphigus/diagnosis , Pemphigus/epidemiology , Brazil , Pemphigus/genetics , Retrospective Studies , Rural Population
7.
An. bras. dermatol ; 71(supl.1): 43-6, mar.-abr. 1996. tab
Article in Portuguese | LILACS | ID: lil-195779

ABSTRACT

Os autores estudaram 318 pacientes com pênfigo foliáceo endêmico no Estado de Minas Gerais, atendidos nos níveis ambulatorial e hospitalar, entre 1985 e 1987. Näo foi observada predileçäo por sexo ou cor. Houve discreto predomínio de pacientes residentes na zona ruaral (57,3 por cento) ou que exerciam atividades próprias daquele meio (56 por cento). A ocorrência da doença foi maior na faixa etária entre dez e trinta anos (47,1 por cento). A localizaçäo inicial das lesöes foi preferencialmente a regiäo torácica anterior (32 por cento). A existência de casos familiares foi verificada em 8 por cento dos pacientes, todos geneticamente relacionados. O sinal de Nikolsky estava positivo em 83,1 por cento dos casos. A regiäo metalúrgica mostrou maior número de pacientes (25,8 por cento). Na terceira fase do estudo, realizada em Cachoeira da Prata, observou-se o mesmo padräo de distribuiçäo.


Subject(s)
Humans , Female , Child , Adolescent , Adult , Pemphigus/epidemiology , Skin Diseases, Vesiculobullous/epidemiology , Outpatients , Pemphigus/genetics , Rural Population , Skin Diseases, Vesiculobullous/genetics
9.
An. bras. dermatol ; 68(1): 57-60, jan.-fev. 1993. ilus
Article in Portuguese | LILACS | ID: lil-126490

ABSTRACT

Os autores apresentam um paciente do sexo masculino, com 45 anos, portador de bulose crônica benigna familial, cujas manifestaçöes clínicas surgiram aos quatorze anos de idade


Subject(s)
Humans , Male , Female , Adolescent , Adult , Chronic Disease , Pemphigus/genetics , Diagnosis, Differential , Pemphigus/diagnosis
SELECTION OF CITATIONS
SEARCH DETAIL