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1.
Mem. Inst. Oswaldo Cruz ; 119: e230129, 2024. tab, graf
Article in English | LILACS-Express | LILACS | ID: biblio-1534930

ABSTRACT

BACKGROUND Leprosy is a highly neglected disease that is considered a serious public health problem in many countries. This illness is characterised by a variety of clinical and histopathological manifestations that are related to the patient immune response. OBJECTIVES This work aimed evaluate the profile of circulating immune mediators in the plasma from patients classified clinically as paucibacillary (PB), multibacillary (MB), households contacts (HHC), type1 leprosy reaction (T1R), type2 leprosy reaction (T2R) and control individuals without medical history of leprosy (CTL). METHODS To assessment of the plasma immune mediators was used multiplex microbeads immunoassay "Luminex". FINDINGS The results showed that patients (PB) had a regulatory-biased profile, while MB revealed a pro-inflammatory trend of highly expressed biomarkers. HHC display conspicuously increased levels in the plasma of the chemokines (CCL2, CCL3, CCL4, CCL5 and CXCL8), pro-inflammatory cytokines (IFN-γ,TNF and IL-1β), modulating cytokines (IL-9 and IL-1Ra) and growth factors (PDGF, G-CSF and IL-2). Interestingly, HHC displayed superior production of IFN-γ as compared to other leprosy groups, indicating a putative protective role for this cytokine during chronic Mycobacterium leprae exposure. MAIN CONCLUSION Further investigations are currently underway to elucidate the potential of these mediators as biomarkers applicable to the diagnosis/prognosis of leprosy and also T1R and T2R leprosy reactions.

2.
Rev. Soc. Bras. Med. Trop ; 45(1): 35-44, Jan.-Feb. 2012. ilus
Article in English | LILACS | ID: lil-614906

ABSTRACT

INTRODUCTION: The goal was to develop an in-house serological method with high specificity and sensitivity for diagnosis and monitoring of Chagas disease morbidity. METHODS: With this purpose, the reactivities of anti-T. cruzi IgG and subclasses were tested in successive serum dilutions of patients from Berilo municipality, Jequitinhonha Valley, Minas Gerais, Brazil. The performance of the in-house ELISA was also evaluated in samples from other relevant infectious diseases, including HIV, hepatitis C (HCV), syphilis (SYP), visceral leishmaniasis (VL), and American tegumentary leishmaniasis (ATL), and noninfected controls (NI). Further analysis was performed to evaluate the applicability of this in-house methodology for monitoring Chagas disease morbidity into three groups of patients: indeterminate (IND), cardiac (CARD), and digestive/mixed (DIG/Mix), based on their clinical status. RESULTS: The analysis of total IgG reactivity at serum dilution 1:40 was an excellent approach to Chagas disease diagnosis (100 percent sensitivity and specificity). The analysis of IgG subclasses showed cross-reactivity, mainly with NI, VL, and ATL, at all selected serum dilutions. Based on the data analysis, the IND group displayed higher IgG3 levels and the DIG/Mix group presented higher levels of total IgG as compared with the IND and CARD groups. CONCLUSIONS: These findings demonstrated that methodology presents promising applicability in the analysis of anti-T. cruzi IgG reactivity for the differential diagnosis and evaluation of Chagas disease morbidity.


INTRODUÇÃO: O objetivo foi desenvolver um método sorológico in-house de alta especificidade e sensibilidade para diagnosticar e monitorar a morbidade da doença de Chagas. MÉTODOS: Para tal, a reatividade sorológica de IgG e subclasses foi testada em soros de pacientes chagásicos de Berilo, Vale do Jequitinhonha/MG/Brasil. A reatividade sorológica foi também avaliada em amostras de pacientes com outras doenças infecto-contagiosas relevantes, incluindo o HIV, vírus da hepatite C (VHC), sífilis (SYP), leishmaniose visceral (LV), leishmaniose tegumentar americana (LTA) e controles não infectados (NI) para verificar o desempenho do método. Outras análises foram feitas para avaliar a aplicabilidade desta metodologia no monitoramento da morbidade da doença de Chagas. Com este propósito os pacientes com doença de Chagas foram anteriormente classificados em três grupos: indeterminados (IND), cardíacos (CARD) e digestivos/mistos (DIG/Mis) conforme seu estado clínico. RESULTADOS: A análise da reatividade sorológica de IgG total na diluição 1:40 mostrou ser uma abordagem importante no diagnóstico da doença de Chagas (100 por cento de sensibilidade e especificidade e ausência de reação cruzada com as demais infecções). A análise das subclasses de IgG mostrou reação cruzada principalmente com NI, LV e LTA em todas as diluições. O grupo IND apresentou a maior reatividade para IgG3 e o grupo DIG/Mis apresentou nível mais elevado de IgG se comparados aos grupos IND e CARD. CONCLUSÕES: Estes achados demonstram que o método de ELISA in-house apresenta uma promissora aplicabilidade no diagnóstico diferencial e na avaliação da morbidade da doença de Chagas.


Subject(s)
Adolescent , Adult , Female , Humans , Male , Middle Aged , Young Adult , Antibodies, Protozoan/immunology , Chagas Disease/diagnosis , Enzyme-Linked Immunosorbent Assay/methods , Immunoglobulin G/immunology , Trypanosoma cruzi/immunology , Antigen-Antibody Reactions , Antibodies, Protozoan/blood , Chagas Cardiomyopathy/diagnosis , Chagas Disease/complications , Diagnosis, Differential , Immunoglobulin G/blood , Sensitivity and Specificity
3.
Rev. Soc. Bras. Med. Trop ; 40(1): 29-36, jan.-fev. 2007. ilus, graf, tab
Article in Portuguese | LILACS | ID: lil-449165

ABSTRACT

Neste estudo, foi avaliado o desempenho isolado e combinado de parâmetros laboratoriais, percentual de linfócitos B ( por centoLB), a razão entre células T/B e o por centoCD8+HLA-DR+/CD8+, na identificação de indivíduos assintomáticos-AS ou portadores de HAM/TSP-HT numa população de casos soropositivos para HTLV-1. índices expressos em porcentagem demonstram que cada parâmetro, isoladamente, apresenta desempenho moderado, com co-negatividade=83 por cento e 91 por cento para por centoLB e razão entre células T/B, respectivamente e co-positividade=78 por cento para por centoCD8+HLA-DR+/CD8+. A análise combinada ( por centoCD8+HLA-DR+/CD8+ e razão T/B) não revelou ganho significativo no desempenho (co-positividade=75 por cento, co-negatividade=74 por cento). A análise das razões de verossimilhança em diferentes faixas de valores, para os parâmetros isolados, revelou que um indivíduo soropositivo para HTLV-1 com por centoLB<7 por cento, razão entre células T/B>11 e por centoCD8+HLA-DR+/CD8+>70 por cento possui, respectivamente, 11, 19 e quase 10 vezes mais chances de pertencer ao grupo HT. Portanto, recomenda-se o uso desses indicadores fenótipos na propedêutica laboratorial complementar de monitoração da progressão clínica da infecção crônica pelo HTLV-1.


This study evaluated the performance of single and combined laboratory parameters, B-lymphocyte percentages ( percentLB), T/B cell ratio and percentCD8+HLA-DR+/CD8+, to differentiate asymptomatic cases (AS) from HAM/TSP patients (HT) within a population of HTLV-1 seropositive cases. Percentage indices demonstrated that each parameter alone presented moderate performance, with co-negativity of 83 and 91 percent for percentLB and T/B cell ratio, respectively, and co-positivity of 78 percent for percentCD8+HLA-DR+/CD8+. Combined analysis ( percentCD8+HLA-DR+/CD8+ and T/B cell ratio) did not show any substantial performance enhancement (co-positivity = 75 percent and co-negativity = 74 percent). Likelihood ratio analysis using different value ranges for the separate parameters revealed that HTLV-1 seropositive cases with percentLB<7 percent, T/B cell ratio>11 and percentCD8+HLA-DR+/CD8+>70 percent would have, respectively, 11, 19 and 10 times greater chance of belonging to the HT group. Therefore, use of these phenotypic indicators as complementary laboratory methods for monitoring the clinical progression of chronic HTLV-1 infection is recommended.


Subject(s)
Humans , B-Lymphocytes/immunology , /immunology , HLA-DR Antigens/immunology , HTLV-I Infections/immunology , Biomarkers , Chronic Disease , Disease Progression , HTLV-I Infections/blood , Lymphocyte Count , Phenotype , Predictive Value of Tests , Paraparesis, Tropical Spastic/blood , Paraparesis, Tropical Spastic/immunology , Reproducibility of Results , ROC Curve
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