Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 9 de 9
Filter
1.
Article in English | LILACS-Express | LILACS | ID: biblio-1449239

ABSTRACT

ABSTRACT Dengue is a global and growing health threat, especially in Southeast Asia, West Pacific and South America. Infection by the dengue virus (DENV) results in dengue fever, which can evolve to severe forms. Cytokines, especially interferons, are involved in the immunopathogenesis of dengue fever, and so may influence the disease outcomes. The aim of this study was to investigate the association between severe forms of dengue and two single nucleotide polymorphisms (SNPs) in the interferon-gamma gene (IFNG): A256G (rs2069716) and A325G (rs2069727). We included 274 patients infected with DENV serotype 3: 119 cases of dengue without warning signs (DWoWS), and 155 with warning signs (DWWS) or severe dengue (SD). DNA was extracted, and genotyped with Illumina Genotyping Kit or real time PCR (TaqMan probes). We estimated the adjusted Odds Ratios (OR) by multivariate logistic regression models. When comparing with the ancestral AA/AA diplotype (A256G/A325G), we found a protective association of the AA/AG against DWWS/SD among patients with secondary dengue (OR 0.51; 95% IC 0.24-1.10, p = 0.085), adjusting for age and sex. The variant genotype at locus A325G of the IFNG, in combination with the ancestral genotype at locus A256G, can protect against severe clinical forms of secondary dengue in Brazilian DENV3-infected patients.

2.
Rev. Soc. Bras. Med. Trop ; 54: e0744-2020, 2021. tab, graf
Article in English | LILACS | ID: biblio-1155546

ABSTRACT

Abstract INTRODUCTION Suckling by schistosomotic mice improves anti-ovalbumin (OA) antibody production, while delayed-type hypersensitivity (DTH) remains unaffected. This property of milk from schistosomotic mice was investigated in IL-12/IL-23-deficient mice (IL-12p40KO). METHODS We compared anti-OA DTH, IgG2a and cytokines in wild-type and IL-12p40KO mice suckled by infected (SIM) or non-infected (CONTROL) mothers. RESULTS SIM mice showed similar intensity and eosinophils in the DTH, which was abolished in IL-12p40KO and IL-12p40KO-SIM mice. In IL-12p40KO-SIM, IgG2a and TGF-β levels were higher, but IL-6 levels were lower. CONCLUSIONS Milk from schistosomotic mothers may evoke IgG2a without eliciting DTH in IL-12/IL-23 deficiencies, by changing TGF-β/IL-6 levels.


Subject(s)
Humans , Animals , Female , Schistosoma mansoni , Interleukin-12 , Immunoglobulin G , Transforming Growth Factor beta , Interleukin-23 , Mice , Mothers
3.
Rev. Soc. Bras. Med. Trop ; 51(1): 21-29, Jan.-Feb. 2018. tab, graf
Article in English | LILACS | ID: biblio-897054

ABSTRACT

Abstract INTRODUCTION The functioning of the immune system during pregnancy is altered in both human immunodeficiency virus (HIV)-infected and uninfected women. Unfavorable socioeconomic conditions have been indicative of higher morbidity and mortality and worsening of the immune system. The aim of this study was to correlate social status with levels of interleukin (IL)-10 (non-inflammatory) and interferon-gamma (IFN-γ; inflammatory) cytokines. METHODS A cross-sectional study was conducted with three groups of women: 33 pregnant HIV-infected (G1); 40 non-pregnant, HIV-infected (G2); and 35 pregnant, HIV-uninfected. To measure the social status, a compound indicator called the social status index (SSI), was established using sociodemographic variables (i.e., education level, housing conditions, per capita income, and habitation and sanitary conditions). RESULTS The HIV-infected women had a higher proportion of unfavorable SSI (73% and 75% of G1 and G2, respectively). There were significantly lower IL-10 levels in the G1 group with both unfavorable and favorable SSI than in the other groups. No significant difference in IFN-γ levels was observed among groups. However, the G1 group had higher IFN-γ values among both favorable and unfavorable SSI groups. CONCLUSIONS Higher rates of unfavorable conditions, including lower education levels, IL-10 levels, and a trend for higher IFN-γ levels, were identified among HIV-infected women, pregnant and non-pregnant. These factors may interfere in health care and lead to poor outcomes during pregnancy. Therefore, we suggest that health policies could be created to specifically address these factors in this population.


Subject(s)
Humans , Female , Pregnancy , Adult , Pregnancy Complications, Infectious/immunology , HIV Infections/immunology , Interferon-gamma/blood , Interleukin-10/blood , Pregnancy Complications, Infectious/blood , Pregnancy Complications, Infectious/virology , Social Conditions , Socioeconomic Factors , Brazil , HIV Infections/blood , Cross-Sectional Studies , Interferon-gamma/immunology , Interleukin-10/immunology
4.
Arq. gastroenterol ; 54(1): 51-56, Jan.-Mar. 2017. tab, graf
Article in English | LILACS | ID: biblio-838823

ABSTRACT

ABSTRACT BACKGROUND Periportal fibrosis is the major pathological consequence of the Schistosoma mansoni infection. OBJECTIVE To evaluate the accuracy of serum markers and to construct an index to assess fibrosis. METHODS Patients (n=116) with schistosomiasis were evaluated by ultrasound scan and measurements of serum levels of aminotransferases, γ-glutamyl transferase, alkaline phosphatase, hyaluronic acid, cytokines and platelets. Ultrasound images were used to evaluate the fibrosis using Niamey's classification and identified 19 patients without periportal fibrosis (patterns A and B), 48 with mild to moderate fibrosis (C and D) and 49 with advanced fibrosis (E and F). RESULTS Using multivariate analysis, a model was created, which involved alkaline phosphatase and platelets and could separate patients with different patterns of fibrosis. This index showed a better performance in separating patients without fibrosis from with advanced periportal fibrosis. The biological index showed an area under the ROC curve of 1.000. Using values below the lowest or above the highest cut-off point, the presence or absence of advanced fibrosis could be predicted in all patients. CONCLUSION The index constructed can be used to separate patients with different patterns of periportal fibrosis, specially to predict advanced fibrosis in schistosomiasis patients.


RESUMO CONTEXTO A fibrose periportal é a maior consequência patológica da infecção pelo Schistosoma mansoni. OBJETIVO Avaliar a acurácia de marcadores séricos e construir um índice para avaliar a fibrose. MÉTODOS Pacientes (n=116) com esquistossomose foram avaliados pela ultrassonografia e dosados os níveis de aminotransferases, γ-glutamil transferase, fosfatase alcalina, ácido hialurônico, citocinas e plaquetas. Imagens de ultrasom foram utilizadas para avaliar a fibrose através de classificação de Niamey e identificados 19 pacientes sem fibrose periportal (padrão A e B), 48 com fibrose média a moderada (C e D) e 49 com fibrose avançada (E e F). RESULTADOS Através de análise multivariada, um modelo foi criado, que envolveu a fosfatase alcalina e plaquetas e conseguiu separar pacientes com diferentes padrões de fibrose periportal. Este índice mostrou um melhor desempenho em separar pacientes sem fibrose dos pacientes com fibrose avançada. O índice biológico mostrou uma área sob a curva ROC de 1,000. Usando valores infereiores e acima do ponto de corte, a presença ou ausência de fibrose avançada pode ser prevista em todos os pacientes. CONCLUSÃO O índice construído pode ser usado para separar os pacientes com diferentes padrões de fibrose periportal, especialmente para prever fibrose avançada em pacientes com esquistossomose.


Subject(s)
Humans , Male , Female , Adolescent , Adult , Aged , Young Adult , Schistosomiasis mansoni/blood , Schistosomiasis mansoni/diagnostic imaging , Biomarkers/blood , Liver Cirrhosis/blood , Liver Cirrhosis/diagnostic imaging , Severity of Illness Index , Blood Platelets , Schistosomiasis mansoni/complications , Predictive Value of Tests , Cytokines/blood , Sensitivity and Specificity , Alkaline Phosphatase/blood , gamma-Glutamyltransferase/blood , Transaminases/blood , Hyaluronic Acid/blood , Liver Cirrhosis/parasitology , Middle Aged
5.
Int. j. cardiovasc. sci. (Impr.) ; 29(4): f:288-l:294, jul.-ago. 2016. tab
Article in Portuguese | LILACS | ID: biblio-831826

ABSTRACT

Fundamento: A síndrome coronariana aguda (SCA) é a principal causa de morbidade e mortalidade no mundo. É uma doença multifatorial causada por obstrução das artérias coronárias por placa ateromatosa que leva à isquemia cardíaca. Diversos estudos sugerem que alguns polimorfismos genéticos alteram os níveis de citocinas e influenciam o desenvolvimento de SCA. Objetivo: Neste estudo, avaliamos o polimorfismo - 174 G/C do gene IL-6 , níveis séricos de citocina e sua relação com SCA e escore de risco de thrombolysis in myocardial infarction (TIMI). Materiais e métodos: Foram selecionados 200 pacientes com SCA [risco de TIMI ­ Baixo (70), Intermediário (89), Alto (41)] na população brasileira. A genotipagem foi feita pela reação em cadeia da polimerase (PCR), seguida de sequenciamento de DNA. Resultados: Não houve diferenças significativas na distribuição dos genótipos (p = 0,53) e dos alelos (p = 0,32) entre grupos de pacientes com SCA e sem SCA no polimorfismo alélico do IL-6 , nem entre os três escores de risco TIMI (p > 0,05). Além disso, o polimorfismo do IL-6 não afetou os níveis de citocina, os quais não estavam relacionados ao escore de TIMI. Conclusões: Com esses resultados, sugerimos que o polimorfismo ­ 174 G/C do gene IL-6, até agora, não está relacionado à SCA e não alterou os níveis de citocina na população estudada. Novos estudos em populações diferentes devem ser feitos para verificar esses resultados. É importante enfatizar que, como a SCA é uma doença multifatorial, outros fatores de risco e outras citocinas pró-inflamatórias devem ser avaliadas para o conhecimento dessa patologia


Background: Acute coronary syndrome (ACS) is a leading cause of morbidity and mortality worldwide. It is a multifactorial disease caused by obstruction of the coronary arteries by atheromatous plaques and leads to heart ischemia. Several studies suggest that some genetic polymorphisms change the cytokines levels and influence ACS development. Objective: In this study, we evaluated the IL-6 polymorphism -174 G/C, serum levels of cytokine and its relationship with ACS and the thrombolysis in myocardial infarction (TIMI) risk score. Materials and Methods: A sample of 200 patients with ACS [TIMI risk ­ Low (70); Intermediate (89); High (41)] in Brazilian population was used. Genotyping was carried out by polymerase chain reaction, followed by DNA sequencing. Results: There was no significant differences in genotype (p = 0.53) and allele (p = 0.32) distributions between ACS patient and without ACS patients groups on IL-6 allelic polymorphism and between the three different TIMI risk score (p > 0.05). Moreover IL-6 polymorphism did not affect the cytokine levels and these levels were not related to the TIMI score. Conclusions: With these results, we suggest that the IL-6 (-174 G/C) polymorphism, until now, is not related to ACS and did not change the levels of the cytokine in studied population. Further studies with different populations should be done to verify those results. It is important to emphasize that, since ACS is a multifactorial disease, other risk factors and other pro-inflammatory cytokines should be assessed to better understand this pathology


Subject(s)
Humans , Male , Female , Middle Aged , Aged , Acute Coronary Syndrome/complications , Acute Coronary Syndrome/physiopathology , Brazil , Polymorphism, Genetic/genetics , Cardiovascular Diseases/physiopathology , Coronary Vessels , Cross-Sectional Studies , Genotype , Risk Factors , Data Interpretation, Statistical
6.
Mem. Inst. Oswaldo Cruz ; 105(4): 460-466, July 2010. tab
Article in English | LILACS | ID: lil-554813

ABSTRACT

Liver biopsy is the gold-standard method to stage fibrosis; however, it is an invasive procedure and is potentially dangerous. The main objective of this study was to evaluate biological markers, such as cytokines IL-13, IFN-ã, TNF-á and TGF-â, platelets, bilirubins (Bil), alanine aminotransferase (ALT) and aspartate aminotransferase (AST), total proteins, ã-glutamil transferase (ã-GT) and alkaline phosphatase (AP), that could be used to predict the severity of hepatic fibrosis in schistosomiasis and hepatitis C (HC) as isolated diseases or co-infections. The following patient groups were selected: HC (n = 39), HC/hepatosplenic schistosomiasis (HSS) (n = 19), HSS (n = 22) and a control group (n = 13). ANOVA and ROC curves were used for statistical analysis. P < 0.05 was considered significant. With HC patients we showed that TNF-á (p = 0.020) and AP (p = 0.005) could differentiate mild and severe fibrosis. With regard to necroinflammatory activity, AST (p = 0.002), ã-GT (p = 0.034) and AP (p = 0.001) were the best markers to differentiate mild and severe activity. In HC + HSS patients, total Bil (p = 0.008) was capable of differentiating between mild and severe fibrosis. In conclusion, our study was able to suggest biological markers that are non-invasive candidates to evaluate fibrosis and necroinflammatory activity in HC and HC + HSS.


Subject(s)
Adolescent , Adult , Aged , Humans , Middle Aged , Young Adult , Biomarkers/blood , Hepatitis C/blood , Liver Cirrhosis/blood , Liver Diseases, Parasitic/blood , Schistosomiasis/blood , Splenic Diseases/blood , Analysis of Variance , Case-Control Studies , Hepatitis C , Hepatitis C/pathology , Liver Cirrhosis , Liver Cirrhosis/pathology , Liver Diseases, Parasitic , Liver Diseases, Parasitic/pathology , Necrosis/pathology , ROC Curve , Severity of Illness Index , Schistosomiasis , Schistosomiasis/pathology , Splenic Diseases , Splenic Diseases/pathology
7.
Mem. Inst. Oswaldo Cruz ; 103(6): 561-568, Sept. 2008. ilus, tab
Article in English | LILACS | ID: lil-495731

ABSTRACT

The production and regulation of interleukin (IL) IL-13, IL-4 and interferon-gamma (IFN-³) was evaluated in 43 schistosomiasis patients with different clinical forms. Whole-blood cultures cytokine production in response to soluble egg antigen (SEA), soluble worm adult preparation (SWAP), mitogens, neutralizing antibodies or recombinant IL-13 were measured by ELISA. After SWAP stimulation, chronic patients, particularly hepatointestinals, produced higher levels of IL-4 in comparison with acute patients, suggesting the presence of a type 2 cytokine profile in these patients. Following SEA and SWAP stimulation, hepatosplenic (HS) patients showed increased levels of IFN-³ when compared with acute patients, indicating that HS disease in humans is associated with a type 1 cytokine response. The mechanisms of immune regulation are apparently different between the clinical stages of the disease, some of which are antigen-specific.


Subject(s)
Adolescent , Adult , Child , Female , Humans , Male , Middle Aged , Young Adult , Interferon-gamma/biosynthesis , /biosynthesis , /biosynthesis , Schistosomiasis mansoni/immunology , Acute Disease , Case-Control Studies , Chronic Disease , Enzyme-Linked Immunosorbent Assay , Schistosomiasis mansoni/metabolism , Young Adult
8.
Recife; s.n; 2007. 92 p. ilus, tab.
Thesis in Portuguese | LILACS | ID: lil-527326

ABSTRACT

A fibrose é a principal causa de morbidade e mortalidade relacionada a hepatite C e esquistossomose. Vários estudos surgiram na tentativa de desenvolver métodos não invasivos para avaliar o grau da fibrose hepática. O grau das lesões necro-inflamatórias, estágio da fibrose e a possível relação sinérgica na co-infecção hepatite C e esquistossomose para uma progressão à doença hepática severa não foi completamente elucidada. O objetivo principal desse projeto foi avaliar marcadores biológicos com potencial para previsão de severidade/gravidade de fibrose hepática na esquistossomose, hepatite C e na co-infecção. Foram selecionados: pacientes com hepatite C (n=37), hepatite C/ esquistossomose hepatoesplênica (n=19), e com esquistossomose hepatoesplênica, (EHE, n=23) e grupo controle (n=13). Biópsias hepáticas, ultrassonografia, parasitológicos de fezes, testes bioquímicos de bilirrubinas, alanina amino transferase (ALT) e aspartato amino transferase (AST), eletroforese de proteínas, gama- glutamil transferase (g-GT), fosfatase alcalina (FA) e ácido hialurônico foram realizados em todos os pacientes. Também foram realizadas pesquisa de anticorpos para hepatite B, anti-HIV, anti-HCV e confirmação da hepatite C através da detecção do RNA viral e genotipagem. As citocinas IFN-g, TGF-b, TNF-? e IL-13 foram dosadas no plasma e as citocinas IL-13 e IFN-g foram detectadas nas biópsias hepáticas através da técnica de RT-PCR em Tempo Real. A análise estatística foi realizada através de ANOVA e curvas ROC, considerando p < 0,05 como significativo. Não se observou diferenças estatísticas nos níveis séricos das citocinas TGF-b, IFN-g, TNF-a e IL-13 entre os 4 grupos estudados. Em relação aos graus de fibrose demonstrou-se que a citocina TNF-a (p= 0,010), ácido hialurônico (p= 0,036) e FA (p= 0,004) diferenciaram os pacientes com hepatite C entre fibrose leve e severa.Nesses pacientes, os níveis de ALT (p = 0,013), AST (p = 0,030) e FA (p = 0,021) diferenciaram em atividade inflamatória leve e severa. Nos pacientes com EHE, demonstramos que a gGT (p= 0,034) e relação AST/ plaquetas diferenciou fibrose grau II e III. Analisando sensibilidade e especificidade, concluiu-se que os possíveis marcadores biológicos para diagnosticar fibrose e atividade inflamatória hepática em pacientes com hepatite C foram TNF-a, ácido hialurônico, FA, ALT e AST.


Subject(s)
Humans , Communicable Diseases , Communicable Diseases/parasitology , Biomarkers , Antigens , Cytokines , Liver Cirrhosis
9.
Recife; s.n; 2007. 92 p. ilus, tab.
Thesis in Portuguese | LILACS | ID: lil-507840

ABSTRACT

A fibrose é a principal causa de morbidade e mortalidade relacionada a hepatite C e esquistossomose. A biópsia hepática e considerada o padrão-ouro para acessar 0 estágio da fibrose; no entanto, e um procedimento invasivo e tem potencial para complicações. Com isso, vários estudos surgiram na tentativa de desenvolver métodos não invasivos para avaliar 0 grau da fibrose hepática. O grau das lesões necro-inflamatórias, estágio da fibrose e a possível relação sinérgica na co-infecção hepatite C e esquistossomose para uma progressão à doença hepática severa não foi completamente elucidada. O objetivo principal desse projeto foi avaliar marcadores biológicos com potencial para previsão de severidade/gravidade de fibrose hepática na esquistossomose, hepatite C e na co-infecção. Foram selecionados: pacientes com hepatite C (n=37), hepatite CI esquistossomose hepatoesplênica (n=19), e com esquistossomose hepatoesplênica, (EHE, n=23) e grupo controle (n=13). Biópsias hepáticas, ultrassonografia, parasitológicos de fezes, testes bioquímicos de bilirrubinas, alanina amino transferase (ALT) e aspartato amino transferase (AST), eletroforese de proteínas, gama- glutamil transferase (y¬GT), fosfatase alcalina (FA) e ácido hialurônico foram realizados em todos os pacientes. Também foram realizadas pesquisa de anticorpos para hepatite B, anti-¬HIV, anti-HCV e confirmação da hepatite C através da detecção do RNA viral e genotipagem. As citocinas 1FN-γ, TGF-β, TNF-a e IL-13 foram dosadas no plasma e as citocinas IL-13 e IFN-γ foram detectadas nas biópsias hepáticas através da técnica de RT-PCR em Tempo Real. A análise estatística foi realizada através de ANOVA e curvas ROC, considerando p < 0,05 como significativo. Não se observou diferenças estatísticas nos níveis séricos das citocinas TGF- β, IFN- γ, TNF-a e IL-13 entre os 4 grupos estudados. Em relação aos graus de fibrose demonstrou-se que a citocina TNF-a (p= 0,010), acido hialurônico (p= 0,036) e FA (p= 0,004) diferenciaram os pacientes com hepatite C entre fibrose leve e severa. Nesses pacientes, os níveis de AL T (p = 0,013), AST (p = 0,030) e FA (p = 0,021) diferenciaram em atividade inflamat6ria leve e severa. Nos pacientes com EHE, demonstramos que a yGT (p= 0,034) e relação ASTI plaquetas diferenciou fibrose grau II e III. Analisando sensibilidade e especificidade, concluiu-se que os possíveis marcadores biológicos para diagnosticar fibrose e atividade inflamatória hepática em pacientes com hepatite C foram TNF-a, acido hialurônico, FA, ALT e AST.


Subject(s)
Humans , Antigens , Cytokines , Hepatitis C , Liver Cirrhosis , Biomarkers , Schistosomiasis
SELECTION OF CITATIONS
SEARCH DETAIL