Serum Levels of Infliximab and Anti-Infliximab Antibodies in Brazilian Patients with Crohn's Disease

OBJECTIVES: The aim of this study was to evaluate the quantitative serum level of infliximab (IFX) as well as the detection of anti-infliximab antibodies (ATIs) in patients with Crohn's disease (CD). METHOD: Forty patients with CD under treatment at a tertiary center in southeastern Brazil were evaluated. Their use of infliximab was continuous and regular. We analyzed and compared the differences in the IFX and ATI levels between the patients with active CD (CDA) and those with CD in remission (CDR). RESULTS: There was no difference in the IFX level between the CDA and CDR groups (p>0.05). Eighty percent of all patients had IFX levels above the therapeutic concentration (6-10 μg/mL). Two (9%) of the 22 patients with active disease and four (22.2%) of the 18 patients in remission had undetectable levels of IFX. Four (66.6%) of the six patients with undetectable levels of IFX had positive ATI levels; three of these patients were in remission, and one had active disease. In addition, the other two patients with undetectable levels of IFX presented ATI levels close to positivity (2.7 and 2.8 AU/ml). None of the patients with therapeutic or supratherapeutic IFX levels had positive ATI levels. CONCLUSIONS: The undetectable levels of IFX correlated with the detection of ATIs, which was independent of disease activity. Immunogenicity was not the main factor for the loss of response to IFX in our study, and the majority of patients in both groups (CDA and CDR) had supratherapeutic levels of IFX.

Anti-serum validation for use in immunohistochemistry for Trypanosoma cruzi detection

Abstract INTRODUCTION: The detection of Trypanosoma cruzi in tissue samples is important in many situations, such as testing of the reactivation of the infection. The detection of T. cruzi nests in endomyocardial biopsies (EMB) may be useful to evaluate graft rejection. Given their scarcity, such nests are not routinely identified. To increase the diagnosis sensitivity, immunohistochemistry (IHC) may serve as a promising strategy. Here, we validate an antiserum for the detection of T. cruzi infection by IHC. METHODS: We used 1) positive controls (PCs) - 13 EMB, 12 skin biopsies, and 1 heart with T. cruzi nests as sections stained with hematoxylin and eosin (HE); 2) negative controls - a) 10 explant hearts and 10 EMB with no amastigote nests or clinical/laboratory signs of chagasic infection; and b) eight samples with leishmaniasis, toxoplasmosis, or histoplasmosis; and 3) Cases - 31 EMB of chagasic patients with no parasite nests in HE sections but detected positive for T. cruzi DNA by polymerase chain reaction. As a primary antibody, a hyperimmune serum from T. cruzi-infected rabbits was used. RESULTS: IHC results were positive for 21 of 26 PCs (80.8%) and one case of cutaneous leishmaniasis. In 4 of 31 cases, IHC revealed nests (12.9%), which were undetected by conventional histological examination. CONCLUSIONS: This study shows that IHC with the tested antiserum increases the sensitivity of the diagnosis and may be recommended for routine use in EMB analyses of cardiac transplant patients with Chagas disease.

Technical advances in flow cytometry-based diagnosis and monitoring of paroxysmal nocturnal hemoglobinuria / Avanços técnicos no diagnóstico e no monitoramento de hemoglobinúria paroxística noturna por citometria de fluxo

ABSTRACT Objective: To discuss the implementation of technical advances in laboratory diagnosis and monitoring of paroxysmal nocturnal hemoglobinuria for validation of high-sensitivity flow cytometry protocols. Methods: A retrospective study based on analysis of laboratory data from 745 patient samples submitted to flow cytometry for diagnosis and/or monitoring of paroxysmal nocturnal hemoglobinuria. Results: Implementation of technical advances reduced test costs and improved flow cytometry resolution for paroxysmal nocturnal hemoglobinuria clone detection. Conclusion: High-sensitivity flow cytometry allowed more sensitive determination of paroxysmal nocturnal hemoglobinuria clone type and size, particularly in samples with small clones.

RESUMO Objetivo: Discutir as melhorias técnicas no diagnóstico e no acompanhamento laboratorial de hemoglobinúria paroxística noturna para a validação da técnica de citometria de fluxo de alta sensibilidade. Métodos: Estudo retrospectivo, que envolveu a análise de dados laboratoriais de 745 pacientes com hipótese diagnóstica e/ou acompanhamento de hemoglobinúria paroxística noturna por citometria de fluxo. Resultados: Os avanços técnicos não só reduziram o custo do ensaio, mas também melhoraram a identificação e a resolução da citometria de fluxo para a detecção de clone hemoglobinúria paroxística noturna. Conclusão: A citometria de fluxo de alta sensibilidade possibilitou a identificação do tipo e do tamanho de clone de hemoglobinúria paroxística noturna, especialmente em amostras com pequeno clone.

Golimumab Therapy in Ulcerative Colitis / 대한소화기학회지

Ulcerative colitis is a chronic inflammatory condition of the colon, characterized by diffuse mucosal inflammation and blood-mixed diarrhea. The main treatment has been 5-aminosalicylic acid, steroid, thiopurine, and anti-tumor necrosis factor alpha (TNF-alpha) antibodies including infliximab, adalimumab, and golimumab. Golimumab, a new anti-TNF-alpha agent has been recently approved for patients with moderate to severe ulcerative colitis. Its efficacy and safety has been demonstrated in line with infliximab and adalimumab in preclinical and clinical studies. This review will focus on golimumab therapy in ulcerative colitis.

Development and clinical evaluation of a rapid diagnostic kit for feline leukemia virus infection

Feline leukemia virus (FeLV) causes a range of neoplastic and degenerative diseases in cats. To obtain a more sensitive and convenient diagnosis of the disease, we prepared monoclonal antibodies specific for the FeLV p27 to develop a rapid diagnostic test with enhanced sensitivity and specificity. Among these antibodies, we identified two clones (hybridomas 8F8B5 and 8G7D1) that specifically bound to FeLV and were very suitable for a diagnostic kit. The affinity constants for 8F8B5 and 8G7D1 were 0.35 x 10(9) and 0.86 x 10(9), respectively. To investigate the diagnostic abilities of the rapid kit using these antibodies, we performed several clinical studies. Assessment of analytical sensitivity revealed that the detection threshold of the rapid diagnostic test was 2 ng/mL for recombinant p27 and 12.5 x 10(4) IU/mL for FeLV. When evaluating 252 cat sera samples, the kit was found to have a kappa value of 0.88 compared to polymerase chain reaction (PCR), indicating a significant correlation between data from the rapid diagnostic test and PCR. Sensitivity and specificity of the kit were 95.2% (20/21) and 98.5% (257/261), respectively. Our results demonstrated that the rapid diagnostic test would be a suitable diagnostic tool for the rapid detection of FeLV infection in cats.

Molecular characterization of rabies virus isolated from non-haematophagous bats in Brazil / Caracterização molecular do vírus da raiva isolado de morcegos não-hematófagos no Brasil

INTRODUCTION: Rabies is an important zoonosis that causes thousands of deaths worldwide each year. Although the terrestrial cycle, mainly transmitted by dogs, is controlled in Brazil, the aerial cycle remains a serious public health issue, besides the economic problem. In the aerial cycle, the haematophagous bat Desmodus rotundus is the main source of infection, where several different species of non-haematophagous bats can be infected and can transmit the virus. METHODS: The aim of this work was to study the epidemiological pattern of rabies using antigenic characterization with monoclonal antibodies and genetic characterization by reverse-transcriptase polymerase chain reaction followed by sequencing and phylogenetic analysis of non-haematophagous bats' and herbivorous animals' central nervous system samples from the western region of the State of São Paulo, Brazil. RESULTS: From 27 samples, 3 antigenic variants were identified: AgV-3, AgV-4, and AgV-6; and from 29 samples, 5 different clusters were identified, all belonging to the rabies virus species. CONCLUSIONS: Although only non-haematophagous bats were evaluated in the studied region, the majority of samples were from antigenic and genetic variants related to haematophagous bats Desmodus rotundus. Samples from the same antigenic variant were segregated in more than one genetic cluster. This study demonstrated the diversity of rabies virus genetic lineages presented and circulating in non-haematophagous bats in the studied region.

INTRODUÇÃO: A raiva é uma importante zoonose responsável por milhares de mortes anualmente em todo o mundo. Embora o ciclo silvestre, onde os cães são os principais transmissores esteja controlado no Brasil, o ciclo aéreo, onde o morcego hematófago Desmodus rotundus é o principal transmissor e diversas espécies de morcegos não hematófagos podem se infectar e transmitir o vírus, permanence como um importante problema econômico e de saúde pública. MÉTODOS: O objetivo deste trabalho foi a caracterização antigênica por meio da utilização de anticorpos monoclonais e a caracterização genética por meio da reação em cadeia pela polimerase pela transcriptase reversa seguida de análise filogenética em morcegos não hematófagos e animais domésticos herbívoros provenientes da região oeste do Estado de São Paulo. RESULTADOS: A análise antigênica de 27 amostras determinou três variantes distintas: Agv-3, AgV-4 e AgV-6; a análise genética de 29 amostras identificou 5 diferentes grupos, todos pertencentes a espécie Rabies virus. CONCLUSÕES: Ainda que apenas amostras de morcegos não hematófagos tenham sido analisadas, a maioria das variantes antigênicas e genéticas identificadas na região estava relacionada com a variante mantida pelos morcegos hematófagos Desmodus rotundus. Amostras de uma mesma variante antigênica segregaram em mais de um clado genético. Este estudo demonstrou a diversidade de linhagens genéticas do vírus da raiva presentes e circulantes em morcegos não hematófagos na região estudada.

Trypanosoma cruzi: parasite antigens sequestered in heart interstitial dendritic cells are related to persisting myocarditis in benznidazole-treated mice

We investigated whether sequestered Trypanosoma cruzi antigens found in heart interstitial dendritic cells (IDCs) contribute to the residual myocarditis found in mice following treatment with benznidazole, a specific chemotherapeutic drug. IDCs are antigen-presenting cells that are MHC-II-receptor dependent. Swiss mice were divided into two experimental groups: the 1st group was infected with the Colombian strain of T. cruzi, which is resistant to treatment with benznidazole, and the 2nd group was infected with clone 21SF-C 3, which has a medium susceptibility to the drug. Treatment of the Colombian strain group started on the 120th day post-infection and for the 21SF-C3 strain group treatment was started on the 90th day. In both groups, treatment lasted for 90 days. The animals were sacrificed either 150 or 200 days post-treatment. The myocardium was analysed by immunohistochemistry using anti-MAC3, 33D1, CD11b and CD11c monoclonal antibodies for IDCs or anti-T. cruzi purified antibodies. Parasite antigens were expressed on the IDC membranes in both treated and untreated mice. Myocarditis subsided following treatment, evidenced by both histological and morphometrical evaluation. A reduction in the number of IDCs carrying T. cruzi antigens in the treated group indicates that the elimination of parasites influences antigen presentation with concomitant decreases in inflammation. There is a correlation between the presence of T. cruzi antigens in these cells and the chronic focal, residual myocarditis seen in treated mice.

Novo surto de leishmaniose tegumentar americana em área de treinamento militar na Zona da Mata norte do Estado de Pernambuco / New outbreak of American tegumentary leishmaniasis in a military training center in the Zona da Mata region, in the north of the State of Pernambuco

Relata-se novo surto de LTA em militares com 71 casos confirmados pelos critérios clínico, epidemiológico e laboratorial. Obteve-se o isolamento de sete amostras, identificadas como Leishmania (Viannia) braziliensis. A ocorrência de surtos nesta região confirma o caráter endêmico, cuja magnitude parece estar relacionada a não adoção de medidas de proteção individual.

A new outbreak of American tegumentary leishmaniasis among military personnel is reported, with 71 cases confirmed by means of clinical, epidemiological and laboratory criteria. Seven samples were isolated and were identified as Leishmania (Viannia) braziliensis. The occurrence of outbreaks in this region confirms the endemic nature of this disease, and the magnitude of the occurrence seems to be related to non-adoption of individual protection measures.

High levels of serum mannose-binding lectin are associated with the severity of clinical signs of leptospirosis

The clinical heterogeneity observed in leptospirosis may be associated with host factors or bacteria virulence. Human serum mannose-binding lectin (MBL) recognizes many pathogens, and low levels of this lectin are associated with susceptibility to infection. MBL is also implicated in the modulation of the inflammatory process. We determined the levels of serum MBL during leptospirosis infection. A double-antibody sandwich ELISA was used to detect the immunoreactive serum MBL. The ELISA plates were coated with monoclonal antibody to MBL and bound MBL or recombinant human MBL were detected by rabbit anti-human MBL serum. HRPO-conjugated goat anti-rabbit antibody was used for detection of the reaction. Two groups of patients seen at referral hospitals in Recife, PE, Brazil, were divided according to the year of infection, 2001 (N = 61) or 2002 (N = 57) and compared in terms of disease severity and levels of serum MBL. A group of healthy volunteers (N = 97) matched by age, gender, and ethnic background was used as control. Patients infected in 2001 had more severe outcomes than those infected in 2002, including jaundice, hemorrhage, respiratory alteration, and renal complication (P = 0.0009; chi-square test). The frequency of patients producing serum MBL >1000 ng/mL was higher in the 2001 group than in the 2002 and control groups (P < 0.01), suggesting an association of MBL level with disease severity. The involvement of MBL and genetic variation of the MBL2 gene should be further evaluated to establish the role of this lectin in the pathogenesis of leptospirosis.

Rabia en Chile: 1989-2005 / Rabies in Chile: 1989-2005

A retrospective epidemiological study about epidemiology of rabies in Chile between years 1989 and 2005 was done. A data base of 39793 national registries of rabies samples was analyzed by means of statistical packages. Out of 39793 analyzed cases, 719 bats, 7 dogs, 7 cats, 1 bovine and 1 human were positive to rabies throughout the 17 years of this study. The statistical analysis established a significant increase in the proportions of positivity in bats, with predominance of variant 4 between the reservoirs. Given the complexity of the wild cycle of the rabies in Chile, it is necessary to maintain a program control of rabies, directed to educate people for a responsible possession of domestic animals, due to the risk of rabies transmission from bat to the susceptible species.

Se realizó este estudio para actualizar el conocimiento epidemiológico de la rabia en Chile, entre los años 1989 y 2005. Se trabajó con una base de datos de 39.793 registros históricos nacionales de muestras para el diagnóstico de rabia que mantiene el Instituto de Salud Pública de Chile, analizando los datos mediante paquetes estadísticos. De los 39.793 casos analizados se detectaron positivos a rabia en murciélagos (n: 719), perros (n: 7), gatos (n: 7), bovino (n: 1) y humano (n:l) a lo largo de los 17 años de estudio; estos representan el total de casos confirmados en Chile durante ese período. El análisis estadístico determinó un aumento lento pero significativo de positividad a rabia en murciélagos con un predominio de la variante 4 entre los reservónos circulantes. Dada la complejidad del ciclo silvestre de la rabia en Chile, es necesario mantener un programa de control de rabia dirigido a la educación de la población en pro de la tenencia responsable de los animales domésticos; existe riesgo de transmisión de la rabia desde murciélago a las especies susceptibles.

Comparison of direct immunofluorescence, conventional cell culture and polymerase chain reaction techniques for detecting respiratory syncytial virus in nasopharyngeal aspirates from infants / Comparação entre imunofluorescência direta, cultura convencional de células e reação em cadeia de polimerase para detectar vírus respiratório sincicial em lavados de nasofaringe de crianças

A total of 316 samples of nasopharyngeal aspirate from infants up to two years of age with acute respiratory-tract illnesses were processed for detection of respiratory syncytial virus (RSV) using three different techniques: viral isolation, direct immunofluorescence, and PCR. Of the samples, 36 (11.4 percent) were positive for RSV, considering the three techniques. PCR was the most sensitive technique, providing positive findings in 35/316 (11.1 percent) of the samples, followed by direct immunofluorescence (25/316, 7.9 percent) and viral isolation (20/315, 6.3 percent) (p < 0.001). A sample was positive by immunofluorescence and negative by PCR, and 11 (31.4 percent) were positive only by RT-PCR. We conclude that RT-PCR is more sensitive than IF and viral isolation to detect RSV in nasopharyngeal aspirate specimens in newborn and infants.

Um total de 316 amostras de lavado de nasofaringe obtidas de crianças em acompanhamento ambulatorial com até dois anos de idade durante episódio de doença aguda do trato respiratório foram processadas para detecção do vírus sincicial respiratório (VSR) utilizando três diferentes técnicas: isolamento viral, imunofluorescência direta e reação em cadeia por polimerase (RT-PCR). Destas amostras, 36 (11,4 por cento) foram positivas para o VSR. A RT-PCR foi a técnica mais sensível, com positividade em 35 (11,1 por cento) das amostras, seguindo-se a imunofluorescência direta (25/316, 7,9 por cento) e o isolamento viral (20/315, 6,3 por cento) (p < 0,001). Uma amostra foi positiva pela imunofluorescência e negativa pela RT-PCR, e 11/36 (31,4 por cento) foram positivas somente pela RT-PCR. Concluímos que a RT-PCR é mais sensível que a imunofluorescência e o isolamento viral para detecção do VRS em amostras de aspirado de nasofaringe de recém-nascidos e lactentes.

Evaluation of some platelet functions and platelet membrane glycoproteins in uremic, hemodialysis and renal transplant patients

The hemostatic defect of chronic renal failure [CRF] is well recognized. Increased bleeding has been attributed to platelet dysfunction. However, the available reports are controversial. To study platelet aggregation and glycoprotein receptors' [GP] expression in a well identified population with CRF. 25 patients with advanced CRF on conservative treatment [CRF group], 25 patients on regular hemodialysis [HD group], 25 renal transplant patients [Tx group], and 20 age-, race- and sex-matched healthy controls [control group] were subjected to complete physical examination, complete blood count, bleeding time [BT], renal functional parameters and other necessary laboratory tests, in addition to estimation of platelet aggregation in response to adenosine 5-diphosphate [ADP] and ristocetin as well as GPIb, GPIIb, and GPIIIa receptors' expression using fluorescein isothiocyanate-conjugated monoclonal antibodies CD42b, CD41 and CD62, respectively and a flow cytometer. BT was prolonged in both CRF and HD groups [P<0.001], and was not attributed to a decrease in platelet count. Both CRF and HD patients had similar, but significantly decreased maximum percentage of platelet aggregation induced by either ADP or ristocetin compared with Tx and healthy control groups [P<0.001]. GPIb expression was significantly decreased in the CRF group than the Tx and healthy control groups [P<0.05], while HD group showed non significant difference when compared with CRF, Tx or control groups. GPIIb and GPIIIa showed a highly significant decreased expression in both CRF and HD groups compared with Tx and healthy control groups [P<0.001], with no significant difference in between both uremic groups. An inverse correlation was observed between serum creatinine and GPIIb [r=-0.641, P=0.023] and GPIIIa [r=-0.545, P=0.031] receptors' expression in CRF patients versus no correlation in HD patients. The results of the studied parameters in Tx group were comparable to healthy controls. Uremic patients have decreased platelet aggregability and decreased GP receptors' expression [mainly GPIIb and GPIIIa], denoting that platelet dysfunction is at least partially contributing to their hemorrhagic problem. The observed defects were not corrected by regular HD. Renal transplantation seemed to be a better choice

Detecting ABO blood type of bloodstain with fluorescent antibody method / 法医学杂志

UNLABELLED@#OBJECTIVE To explore the advantage and feasibility of fluorescent antibody method for detection of blood type in biological material.@*METHODS@#According to theory of specific binding of antigen and antibody, at first the anti-A monoclonal antibody (MA) and anti-B MA were labeled with the fluorescent, then fluorescent-labeled antibodies (FLA) were bound with corresponding biological material (such as bloodstain) in the optimum condition, finally the ABO blood type of bloodstain was determined under microscope fluorescent.@*RESULTS@#The fluorescent antibody method is highly sensitive, accurate and simple.@*CONCLUSION@#The fluorescent antibody method is an accurate and reliable method for detection of ABO blood type in biological material.

Anti cyclic citrullinated peptide antibodies in IgM rheumatoid factor positive patients: a new insight

The presence of IgM rheumatoid factor [IgM RF] is one of the clinical criteria for the diagnosis of rheumatoid arthritis [RA]. The cutoff point of IgM RF assays is usually based on a reference level obtained from normal subjects in the same population as the patients. However, raising the cutoff values increases the specificity of RF testing. The present study was undertaken to investigate this observation with the help of anti cyclic citrullinated peptide [CCP] antibodies to be of potential diagnostic value. Seventy six patients were chosen with arthritis and IgM RF titers > 20 units/ml. Subsequently, patients were classified according to their IgM RF titers: patients with titers 40 units/ml [group B] and patients [selected from group B] with titers >120 units/ml [group C]. Twenty one RA patients with IgM RF negative and positive anti CCP antibodies were also included in this study. In all serum samples, IgM RF, anti CCP, hepatitis C virus antibodies [HCV], anti-Smith and anti-ribonucleoprotein [anti-RNP] antibodies were determined by ELISA. PCR analysis was performed for all patients with positive HCV antibodies. Antinuclear antibodies [ANA] and anti-dsDNA were determined by indirect immunofluorescence. In patients of groups A, B and C, RA was detected in 28.6, 80.5 and 83.3% of all patients, respectively. Anti CCP antibodies detected RA in 22.85, 75.6 and 77.8% of all patients in groups A, B and C, respectively. IgM RF positive non RA patients were diagnosed in 71.4, 19.5 and 16.7% among all patients included in group A, B and C, respectively. In group A, anti CCP antibodies correctly classified 24/25 [96%] of patients with false positive IgM RF as non RA patients, they were positive in only one patient with rhupus. Anti CCP antibodies were positive in 2.8, 4.9 and 11.1% in non RA patients among all patients in group A, B and C, respectively. Anti CCP antibodies were present in 80, 93.9 and 93.3% of RA patients in groups A, B and C, respectively. The overall presence of anti CCP in seropositive RA patients was 90.6%. Kappa statistics showed an excellent agreement between IgM RF and anti CCP for the serodiagnosis of RA. Among the non RA patients of group A, it was found that 9/25 [36%] of patients diagnosed as having HCV infection. Anti CCP antibodies were negative in all HCV patients. Low positive titers of anti CCP antibodies were more prevalent [76.2%] in patients with seronegative RA than in patients with seropositive RA [17.9%]. Results demonstrated that: [1] anti CCP antibodies correctly classified about 24/25 [96%] of patients with false positive IgM RF [< 40 units/ml] as non RA, [2] high titers of IgM RF [>120 units/ml] are of similar high specificity to anti CCP antibodies and [3] anti CCP antibodies are able to differentiate between patients with HCV infection associated with arthritis and patients with RA

Avaliação imunológica na endocardite infecciosa / Immunologic evaluation in infective endocarditis

OBJECTIVE: To analyze the immune response in peripheral blood of patients with infective endocarditis. METHODS: We studied 10 patients with infective endocarditis, age range from 20 to 50 years-old, males and females, and 20 healthy subjects in the same age range. The diagnosis of the disease was based on the clinical picture, echocardiogram, and hemoculture based upon samples drawn and tested before the treatment started. The were no history of atopy or malnutrition, no autoimmune disease, and they were not using any immunosuppressant or antibiotic medication. RESULTS: The patients with endocarditis had significantly higher T and B lymphocyte, CD4+ and CD8+ cell counts, IgM and IgG serum levels, and C4 component of the complement than the control group; no significant difference concerning serum IgA and neutrophil oxidative metabolism; a significant decrease in C3, chemotaxis, and monocyte phagocytosis;cryoglobulins were detected in 66.6 percent of patients and they were formed by IgG, IgM, IgA, C3, and C4. CONCLUSION: The patients with infective endocarditis were immunocompetent in most sectors of immune response and, at a certain moment, an autoimmune component may be present

Enfermedad de Kawasaki. Evaluación inmunológica de 26 casos / Kawasaki disease. Immunological evaluation of 26 cases

La enfermedad de Kawasaki (EK) es una vasculitis aguda febril de la infancia, caracterizada por mútiples signos clínicos y bioquímicos de la inflamación con especial compromiso del corazón. La activación de linfocitos y monocitos/macrófagos y sus produtos solubles secretados, citoquinas , juegan un papel central en la patogénesis de la enfermadad. En este estudio realizamos estudios de laboratorio inmunológico en 26 pacientes con EK. En 22 pacientes en etapa aguda medimos niveles séricos de IgG, IgA, IgM, fracciones del complemento C3 y C4 por Nefelometría, sin encontrar un patrón constante y los anticuerpos FAN y ANCA por imunoflorescencia indirecta fueron negativos. En células mononucleares periféricas de 25 pacientes en etapa aguda encontramos porcentajes variables de CD3, CD4, CD8, CD20, CD56 y DR mediante tinción específica y análisis por cimetría de flujo. El porcentaje de CD25 estuvo elevado en 17/25 casos. Los níveles séricos de TNFalfa medidos poe ELISA en 12 pacientes , fueron bajos. Evaluamos citoquinas intracelulares TNAalfa, IL1beta, IL2, e IFNgamaen células mononucleares periféricas en 15 pacientes en etapas agudas, subagudas y de covalecencia, utilizando tinción específica y análisis por cimetría de flujo, sin encontrar un perfil característico. Dos pacientes mostraron porcentajes elevados de TNFalfa e IL1beta en monocitos durante la etapa de covalecencia, ambos presentaron secuelas coronarias. Es necesario realizar investigación adicioal acerca de este hallazgo. En conclusión, la evaluación inmunulógica mostró un perfil heterógeneo y no se encontró ningún factor de laboratorio en la etapa aguda que sea predictivo de compromiso cardivascular.

Characterization of specific monoclonal antibodies for detection of mefloquine in body fluids.

Specific monoclonal antibodies (MAbs) to mefloquine conjugated to bovine serum albumin (mefloquine-BSA) were produced by hybridoma technology. The mefloquine-BSA was synthesized by converting mefloquine into hemisuccinate followed by convalently linked to bovine serum albumin (BSA) and coupling with N,N' disuccinimidyl carbonate (DSC). The conjugate was purified by Sephadex G-75 gel filtration using 0.01 M PBS pH 7.2. An average of 19.34 molecules of mefloquine were conjugated to each molecule of protein determined by differential UV absorption spectra of hapten and protein carrier. Sixteen monoclones producing antibody specific to mefloquine were screened by indirect ELISA using homologous antigens. The specificity of MAbs was determined by reacting with BSA and the structurally related antimalarial drug, quinine. Three, three, five and two MAbs belonged to IgG1, IgG2a, IgG2b and IgG3, respectively. Most of the MAbs slightly reacted with quinine-BSA due to the closely related structure of mefloquine to quinine. The selected MAb designated 11F9(G5)G9 which showed no cross reaction with quinine-BSA gave high reactivity with blood samples from malaria patients previously treated with mefloquine when compared to normal blood by indirect ELISA. The preliminary results indicated that such specific MAb could be used as antibody probe for detection of mefloquine in biological fluids.

Marcador D8-17: implicações para a neuropsiquiatria / D8/17 marker: implication to neuropsychiatry

Estudos recentes sugerem uma associação entre febre reumática (FR) e transtornos do espectro obsessivo-compulsivo, o que levou à hipótese de que alterações na resposta imune pudessem ter um papel na etiologia destes últimos. Um marcador biológico que talvez identifique maior susceptibilidade para o desenvolvimento de FR e desses transtornos neuropsiquiátricos tem causado grande interesse na literatura. Trata-se do D8/17, um anticorpo monoclonal contra um antígeno de membrana de linfócitos B. Neste artigo introduzimos conhecimentos sobre o D8/17 e discutimos suas implicações como um possível marcador biológico de transtornos neuropsiquiátricos associados ou não à FR.

Relation between lymphocyte subpopulations of peripheral blood and immune responses of modified live hog cholera virus vaccine in pigs treated with an ionized alkali mineral complex

Thirty-nine healthy pigs (28-32 days old) were purchased from a commercial swine farm and housed at swine pens of the College. The animals were vaccinated intramuscularly (1 ml) with an attenuated live hog cholera virus (HCV, LOM strain) and then boostered at 5 weeks after the first vaccination. The animals were divided into 4 experimental groups: 0.05% (w/w) PowerFeel-supplemented diet (T-1, n = 10); 3% (w/w) SuperFeed-supplemented diet (T-2, n = 10); diluted PowerFeel solution (1 : 500, v/v) as drinking water (T-3, n=9); control (n=10). PowerFeel is an original form of ionized alkali mineral complex (IAMC) and SuperFeed is a commercial product of IAMC. The subpopulation of lymphocyte in blood was assayed by a flow cytometry and HCV-specific antibody was determined by an indirect immunofluorescence assay. In IMAC-treated groups, the proportions of subpopulation expressing MHC-class II, CD2+, CD4+, CD8+, and surface IgM+ B lymphocytes were significantly decreased at 5-weeks after the first vaccination. Significant decreases were also observed in the proportions of MHC-class II, CD2+ and CD8+ lymphocyte at 3-weeks after the booster injection. The humoral immune responses in T-1 and T-2 groups were greater than those in T-3 or control group. These results suggest that IAMC-supplemented diets may have an HCV-specific immunostimulatory effect in pigs.