Correlations of CTLA-4 gene polymorphisms and hepatitis C chronic infection.
Liver Int
; 32(5): 803-8, 2012 May.
Article
em En
| MEDLINE
| ID: mdl-22136395
BACKGROUND: Cytotoxic T lymphocyte-associated factor 4 (CTLA-4) functions as a negative regulator of T cell-mediated immune response. Molecular changes associated to CTLA-4 gene polymorphisms could reduce its ability to suppress and control lymphocyte proliferation. AIMS: To evaluate the frequency of CTLA-4 gene polymorphisms in chronic hepatitis C virus (HCV) infected patients and correlate to clinical and histological findings. METHODS: We evaluated 112 HCV-infected subjects prospectively selected and 183 healthy controls. Clinical and liver histological data were analysed. -318C > T, A49G and CT60 CTLA-4 single-nucleotide polymorphisms (SNPs) were studied by PCR-RFLP and AT(n) polymorphism by DNA fragment analysis by capillary electrophoresis in automatic sequencer. RESULTS: Eight AT repetitions in 3'UTR region were more frequent in HCV-infected subjects. We found a positive association of -318C and + 49G with HCV genotype 3 (P = 0.008, OR 9.13, P = 0.004, OR 2.49 respectively) and an inverse association of both alleles with HCV genotype 1 (P = 0.020, OR 0.19, P = 0.002, OR 0.38 respectively). Allele + 49G was also associated to aminotransferases quotients > 3 (qALT, P = 0.034, qAST, P = 0.041). Allele G of CT60 SNP was also associated with qAST > 3 (P = 0.012). Increased number of AT repetitions was positively associated to severe necroinflammatory activity scores in liver biopsies (P = 0.045, OR 4.62). CONCLUSION: CTLA-4 gene polymorphisms were associated to HCV-infection. Eight AT repetitions were more prevalent in HCV-infected subjects. -318C and + 49G alleles were associated to genotypes 1 and 3 infections and increased number of AT repetitions in 3'UTR region favoured severe necroinflammatory activity scores in liver biopsies.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Hepatite C Crônica
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Predisposição Genética para Doença
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Polimorfismo de Nucleotídeo Único
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Antígeno CTLA-4
Tipo de estudo:
Etiology_studies
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Observational_studies
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Risk_factors_studies
Limite:
Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Liver Int
Assunto da revista:
GASTROENTEROLOGIA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Estados Unidos