RESUMO
BACKGROUND: Irritable bowel syndrome (IBS) is a disorder of gut-brain interaction that affects patients' quality. Recent research has shown variations in the mycobiome of individuals with IBS, particularly involving Saccharomyces cerevisiae , and its association with dysbiosis and visceral hypersensitivity. However, the role of Anti-Saccharomyces cerevisiae antibodies (ASCA) in IBS remains unclear, despite their significance as markers of disease severity in inflammatory bowel disease. OBJECTIVE: This study aimed to investigate the role of ASCA in Mexican IBS patients compared with healthy controls (HCs) and determine whether these antibodies could help differentiate between IBS patients and healthy individuals. METHODS: Serum samples from 400 IBS patients and 400 HC were analyzed. ASCA IgG levels were measured using enzyme-linked immunosorbent assay (ELISA). The IBS patients were further categorized into subtypes: constipation predominant (IBS-C), diarrhea predominant (IBS-D), and mixed (IBS-M). RESULTS: Among the participants, 66 IBS patients (16.5%) and 63 HC (15.75%) tested positive for ASCA IgG. No significant difference was observed in ASCA IgG levels between the 2 groups ( P value: 0.8451). The prevalence of ASCA IgG positivity was 14.5% in IBS-C, 17.8% in IBS-D, and 15.9% in IBS-M. CONCLUSION: Surprisingly, a high prevalence of ASCA IgG was found in the HC group in Mexico. Furthermore, there was no significant difference in ASCA IgG levels between IBS patients and controls. These findings suggest that ASCA is not useful as a discriminatory biomarker for distinguishing IBS patients from healthy individuals and cannot serve as a surrogate marker for visceral hypersensitivity.
Assuntos
Síndrome do Intestino Irritável , Humanos , Síndrome do Intestino Irritável/diagnóstico , Síndrome do Intestino Irritável/epidemiologia , Saccharomyces cerevisiae , Estudos de Casos e Controles , Prevalência , Anticorpos Antifúngicos/análise , Biomarcadores , Imunoglobulina GRESUMO
BACKGROUND: Summer-type hypersensitivity pneumonitis (SHP) has been reported to occur during warm and humid summer seasons in Japan; however, the effect of weather conditions on SHP remains unknown. Anti-Trichosporon asahii antibody (TaAb) test is highly specific and useful for the diagnosing SHP. Therefore, we aimed to investigate the impact of weather conditions on SHP by examining the relationship between the positivity rate of TaAb and warm and humid days. METHODS: TaAb test data from June 2013 to June 2020 were obtained from major commercial laboratories to determine the number of samples and positivity rate of TaAb by prefecture. Using the Japan Meteorological Agency database, we counted the warm and humid days (maximum temperature ≥25 °C and average humidity ≥80 %) for each prefecture. Negative binomial regression was employed to examine the relationship between the positivity rate of TaAb and the number of warm and humid days per month. RESULTS: A total of 79,211 samples and 7626 positive samples (9.6 %) were identified. We found that the number of warm and humid days, 1 or 2 months prior to testing for TaAb, was associated with the positivity rate of the test. An increase in the positivity rate by 1.6 % and 2.9 % was observed with every 1-day increase in warm and humid days 1 month and 2 months before the test, respectively. CONCLUSIONS: Our TaAb analysis revealed a significant increase in TaAb positivity 1 or 2 months after periods of warm and humid days.
Assuntos
Alveolite Alérgica Extrínseca , Basidiomycota , Tricosporonose , Humanos , Tricosporonose/diagnóstico , Alveolite Alérgica Extrínseca/diagnóstico , Anticorpos Antifúngicos/análise , Estações do Ano , AnticorposRESUMO
When Aspergillus, an ubiquitous, saprophytic fungus, is detected in respiratory tract specimens collected from chronic respiratory disease patients, it is important to determine whether it is a true infection or colonization. We investigated the usefulness of the Bio-Rad Platelia Aspergillus IgG (Platelia Aspergillus IgG) enzyme-linked immunosorbent assay (ELISA) method and the Aspergillus precipitin test to distinguish pulmonary aspergillosis from colonization. Between January 2017 and November 2021, 51 confirmed, untreated pulmonary aspergillosis (33 chronic pulmonary aspergillosis [CPA] and 18 allergic bronchopulmonary aspergillosis [ABPA]) and 77 colonization patients were included in this study. At first, the conventional cutoff value was utilized in assessing the validity of the two antibody tests for distinguishing pulmonary aspergillosis from colonization. The Platelia Aspergillus IgG cutoff value was then reevaluated to fit this situation. Finally, differences in test accuracy dependent on Aspergillus species were assessed for both antibody tests by comparing cases with Aspergillus fumigatus complex and those with non-fumigatus Aspergillus complex. Both antibody tests demonstrated significantly higher positive rates for pulmonary aspergillosis (P < 0.0001) than colonization. The cutoff value should be 15.7 arbitrary units (AU)/mL to best distinguish infection from colonization, which was higher than the conventional value of 10 AU/mL. The diagnostic sensitivity of Platelia Aspergillus IgG for the non-fumigatus Aspergillus complex was inferior to the A. fumigatus complex (P = 0.019). In conclusion, both Aspergillus antibody tests were valid to distinguish infection from colonization, although we should note the higher cutoff value for Platelia Aspergillus IgG and the lower sensitivity in cases of non-fumigatus Aspergillus infection. IMPORTANCE Pulmonary aspergillosis is the most common pulmonary fungal infection. However, Aspergillus is a ubiquitous, saprophytic fungus; it can be detected in respiratory specimens even in the absence of infection. Especially since Aspergillus is detected in respiratory specimens collected from patients with chronic respiratory disease, it is important to determine whether it is true infection or colonization. We investigated the validity of the Platelia Aspergillus IgG ELISA method and the Aspergillus precipitin test to distinguish pulmonary aspergillosis from colonization. Both antibody tests were considered useful in differentiating true infection from colonization in respiratory practice. The appropriate cutoff value for Platelia Aspergillus IgG was higher than the conventional value, and it was also noted that the sensitivity of both antibody tests for non-fumigatus Aspergillus complex was low. This study will be significant in real-world clinical practice of pulmonary aspergillosis using antibody tests in respiratory care.
Assuntos
Aspergilose Broncopulmonar Alérgica , Aspergilose Pulmonar , Humanos , Testes de Precipitina , Aspergillus , Aspergilose Pulmonar/diagnóstico , Aspergilose Broncopulmonar Alérgica/diagnóstico , Anticorpos Antifúngicos/análise , Imunoglobulina G/análise , Aspergillus fumigatusRESUMO
Microsporidia are a fascinating phylum of obligate intracellular pathogens with unique infection processes and complicated life cycles. Microsporidian life cycles can be divided roughly into intracellular and extracellular stages. Currently, research on their life cycles were mainly explored by morphology because there are few molecular markers available with which to distinguish the different life stages. In this study, we generated H20, a monoclonal antibody (MAb) to label mature spores of Nosema bombycis. Immunofluorescence assays showed that the target protein of H20, which is highly stable and was barely affected by alkali and sodium dodecyl sulfate (SDS) treatments, was located on the mature spore surface. Western blot analysis showed that spore wall protein 26 (SWP26) was the likely target of H20. This MAb can specifically identify mature spores in a complex biological sample based on immunological detection of the parasite.
Assuntos
Nosema/isolamento & purificação , Esporos Fúngicos/isolamento & purificação , Anticorpos Antifúngicos/análise , Anticorpos Monoclonais/análise , Antígenos de Fungos/análise , Western Blotting , Técnica Indireta de Fluorescência para Anticorpo , Técnicas In VitroRESUMO
BACKGROUND: The gold standard for the sporotrichosis diagnosis is culture; however, serologic approaches have been recently implemented to aid in the sporotrichosis diagnosis. Nevertheless, the clinical consequences of the introduction of serologic tests are poorly addressed. AIMS: To correlate the results of culture and serology of patients with suspected sporotrichosis. METHODS: A retrospective study of 198 patients with suspected sporotrichosis was conducted. Information about culture isolation of Sporothrix from clinical samples and antibody detection by an enzyme-linked immunosorbent assay (ELISA) were obtained from the medical records of the patients. RESULTS: Positive culture and antibody detection was observed in the samples of 84 patients (42.4%). Forty-one samples (20.7%) showed negative results with both techniques and divergent results were obtained in the samples of 73 patients (36.9%). False negative results in the ELISA were observed with 23 patients (31.5%), 78.3% of them with less than 30 days of infection (p=0.0045). Among the initial false positive ELISA in the sera of 50 patients, four samples in culture yielded the growth of Sporothrix, and 27 improved with itraconazole. At the end of follow-up, a diagnosis of proven or probable sporotrichosis was established in 139 patients, and possible sporotrichosis in 11 patients. The treatment of the patients with probable sporotrichosis with antifungal drugs resulted in clinical cure for these individuals. CONCLUSIONS: These two techniques are complementary in the diagnosis of sporotrichosis, making diagnosis and clinical decision more precise.
Assuntos
Micologia/métodos , Testes Sorológicos , Sporothrix/isolamento & purificação , Esporotricose/diagnóstico , Adolescente , Adulto , Idoso , Anticorpos Antifúngicos/análise , Antifúngicos/uso terapêutico , Criança , Pré-Escolar , Estudos Transversais , Ensaio de Imunoadsorção Enzimática/estatística & dados numéricos , Reações Falso-Positivas , Feminino , Humanos , Itraconazol/uso terapêutico , Masculino , Pessoa de Meia-Idade , Resultados Negativos/estatística & dados numéricos , Estudos Retrospectivos , Testes Sorológicos/estatística & dados numéricos , Sporothrix/imunologia , Esporotricose/tratamento farmacológico , Adulto JovemRESUMO
BACKGROUND/OBJECTIVES: Antibody detection is commonly used for diagnosis of histoplasmosis, and cross-reactions have been recognised due to endemic mycoses but not cryptococcosis. We observed cross-reactions in an anti-Histoplasma antibody enzyme immunoassay (EIA) in the cerebrospinal fluid (CSF) from a patient with cryptococcal meningitis and sought to assess the risk of cross-reactive anti-Histoplasma antibodies in persons with cryptococcal meningitis. METHODS: An anti-cryptococcal antibody EIA was developed to measure CSF antibody response in HIV-infected subjects from Kampala, Uganda and previously healthy, HIV-negative subjects at the National Institutes of Health (NIH) with cryptococcal meningitis. Specimens were tested for cross-reactivity in assays for IgG anti-Histoplasma, anti-Blastomyces and anti-Coccidioides antibodies. RESULTS: Among 61 subjects with cryptococcal meningitis (44 Kampala cohort, 17 NIH cohort), elevated CSF anti-cryptococcal antibody levels existed in 38% (23/61). Of the 23 CSF specimens containing elevated anti-cryptococcal antibodies, falsely positive results were detected in antibody EIAs for histoplasmosis (8/23, 35%), coccidioidomycosis (6/23, 26%) and blastomycosis (1/23, 4%). Overall, 2% (2/81) of control CSF specimens had elevated anti-cryptococcal antibody detected, both from Indiana. CONCLUSIONS: Cryptococcal meningitis may cause false-positive results in the CSF for antibodies against Histoplasma, Blastomyces and Coccidioides. Fungal antigen testing should be performed to aid in differentiating true- and false-positive antibody results in the CSF.
Assuntos
Anticorpos Antifúngicos/análise , Líquido Cefalorraquidiano/química , Reações Cruzadas , Infecções por HIV/complicações , Meningite Criptocócica/diagnóstico , Testes Sorológicos/métodos , Adulto , Blastomyces/imunologia , Coccidioides/imunologia , Reações Falso-Positivas , Histoplasma/imunologia , Humanos , Estudos Prospectivos , Uganda , Estados UnidosRESUMO
The disaccharide ß-d-mannopyranosyl-(1â¯ââ¯2)-d-mannopyranose obtained by chemical cleavage and enzymatic dephosphorylation of biotechnologically available phosphomannan was transformed over six steps into a biotinylated probe suitable for assessment of carbohydrate specificity of antibodies induced by yeast cell wall preparations.
Assuntos
Anticorpos Antifúngicos/análise , Parede Celular/imunologia , Mananas/química , Manose/síntese química , Biotinilação , Sequência de Carboidratos , Fracionamento Químico , Manose/química , Manose/metabolismo , Saccharomycetales/imunologiaRESUMO
Since the new species Paracoccidioides lutzii emerged in 2009, much has been researched on strains previously considered atypical. Still, there is no consensus about recognition of antigens from P. lutzii by antibodies directed to other Paracoccidioides species, which can have great impact on Paracoccidioidomycosis (PCM) diagnosis. Current research investigated soluble protein/carbohydrate epitopes from P. lutzii LDR2, Paracoccidioides restrepiensis B339 and Paracoccidioides americana LDR3 recognised by IgG directed to Paracoccidioides brasiliensis. Cell free antigens (CFA) were analysed by: (a)silver and periodic acid-Schiff staining of SDS-PAGE; (b)immunoblot (IB) with rabbit IgG anti-P. brasiliensis Pb18; (c)IB and ELISA with a pool of PCM patients' sera before and after treatment with sodium metaperiodate (SMP) to oxidise carbohydrate epitopes. Both rabbit and human immune sera recognised several antigens of P. lutzii LDR2, P. restrepiensis B339 and P. americana LDR3. P. lutzii's gp43 was not observed in IB or silver/PAS staining. SMP treatment affected reactions with all 3 CFAs, but more intensely with antigens from P. lutzii LDR2. In conclusion, antibodies directed to P. brasiliensis recognised antigens from P. lutzii LDR2. The use of any of the recognised antigens in a broad spectrum diagnostic model for Paracoccidioides species complex needs to be further investigated.
Assuntos
Anticorpos Antifúngicos/imunologia , Antígenos de Fungos/imunologia , Paracoccidioides/isolamento & purificação , Paracoccidioidomicose/microbiologia , Animais , Anticorpos Antifúngicos/análise , Antígenos de Fungos/análise , Ensaio de Imunoadsorção Enzimática , Feminino , Humanos , Immunoblotting , Masculino , Paracoccidioides/classificação , Paracoccidioides/genética , Paracoccidioides/imunologia , Paracoccidioidomicose/diagnóstico , CoelhosRESUMO
Pneumocystis carinii f. sp. suis (PCS) nucleic acid and antibody profiles on two Austrian-farrow-to-finish farms were investigated. Furthermore, associations with other respiratory pathogens were evaluated. Respiratory specimen and sera from pigs of five age classes between the 1st week and the 3rd month of life as well as samples from sows were analyzed. On Farm A, PCS infection occurred early in life. The suckling piglets were already infected in the 1st week of life and the pigs remained positive until the 3rd month of life. On Farm B, pigs were infected later, between 3 and 4 months of age. The maximum PCS nucleic acid load on Farm A was 8.3 log10 genome copies/mL BALF, whereas on Farm B the PCS burden was significantly lower, with 4.0 log10 genome copies/mL BALF. Anti-PCS antibodies were detected in sows, as maternal antibodies in suckling piglets and as an immunological reaction to infection. On both farms, PCS infection was accompanied by several co-infections. On Farm A, there were concurrent infections with PRRSV, a virulent strain of Haemophilus parasuis, and Mycoplasma hyopneumoniae. On Farm B, PCS was accompanied by infections with swine influenza virus, Mycoplasma hyopneumoniae, and a non-virulent strain of Haemophilus parasuis. The results clearly show that the PCS profiles can vary between farms. Younger pigs may be more susceptible as they had higher PCS burdens. It is possible that PCS may contribute to a respiratory disease in pigs and further investigation of its potential role is warranted.
Assuntos
Pneumocystis carinii/patogenicidade , Pneumonia por Pneumocystis/veterinária , Doenças dos Suínos/microbiologia , Fatores Etários , Animais , Animais Recém-Nascidos , Anticorpos Antifúngicos/análise , Anticorpos Antifúngicos/sangue , Áustria , Coinfecção/imunologia , Coinfecção/microbiologia , Coinfecção/veterinária , Estudos Transversais , DNA Bacteriano/análise , DNA Bacteriano/sangue , DNA Bacteriano/genética , DNA Fúngico/análise , DNA Fúngico/sangue , DNA Fúngico/genética , DNA Viral/análise , DNA Viral/sangue , DNA Viral/genética , Feminino , Infecções por Haemophilus/imunologia , Infecções por Haemophilus/microbiologia , Infecções por Haemophilus/veterinária , Haemophilus parasuis/genética , Haemophilus parasuis/isolamento & purificação , Masculino , Infecções por Orthomyxoviridae/imunologia , Infecções por Orthomyxoviridae/microbiologia , Infecções por Orthomyxoviridae/veterinária , Pneumocystis carinii/genética , Pneumocystis carinii/imunologia , Pneumonia Suína Micoplasmática/imunologia , Pneumonia Suína Micoplasmática/microbiologia , Pneumonia por Pneumocystis/imunologia , Pneumonia por Pneumocystis/microbiologia , Síndrome Respiratória e Reprodutiva Suína/imunologia , Síndrome Respiratória e Reprodutiva Suína/microbiologia , Síndrome Respiratória e Reprodutiva Suína/virologia , Sus scrofa , Suínos , Doenças dos Suínos/imunologiaRESUMO
Invasive fungal diseases are important clinical problems that are often complicated by severe illness and therefore the inability to use invasive measures to definitively diagnose the disease. Tests for a range of fungal biomarkers that do not require an invasive sample-collection procedure have been incorporated into adult clinical practice, but pediatric data and pediatric-specific recommendations for some of these diagnostic tools are lacking. In this review, we summarize the published literature and contemporary strategies for using the biomarkers galactomannan, (1â3)-ß-d-glucan, Candida mannan antigen and anti-mannan antibody, and fungal polymerase chain reaction for diagnosing invasive fungal disease in children. Data on biomarker use in neonates and children with cancer, history of hematopoietic stem cell transplant, or primary immunodeficiency are included. Fungal biomarker tests performed on blood, other body fluids, or tissue specimens represent promising adjuncts to the diagnostic armamentarium in populations with a high prevalence of invasive fungal disease, but substantial gaps exist in the correct use and interpretation of these diagnostic tools in pediatric patients.
Assuntos
Infecções Fúngicas Invasivas/diagnóstico , Anticorpos Antifúngicos/análise , Antígenos de Fungos/análise , Aspergilose/diagnóstico , Aspergillus/genética , Biomarcadores/sangue , Candida/genética , Candidíase/diagnóstico , Criança , DNA Fúngico/análise , Galactose/análogos & derivados , Humanos , Imunoensaio , Mananas/análise , Reação em Cadeia da Polimerase , beta-Glucanas/análiseRESUMO
Histoplasmosis is endemic to the Midwestern United States, but cases have been reported nearly worldwide. A 1970 study found 3.8% skin test sensitivity to Histoplasma capsulatum in Uganda but no systemic study of histoplasmosis exposure has occurred since the onset of the human immunodeficiency virus (HIV) pandemic. This study investigated the seroprevalence of H. capsulatum and sought previously undetected cases of histoplasmosis in Kampala, Uganda. Serum, cerebrospinal fluid (CSF) and/or urine specimens were obtained from HIV-infected persons with suspected meningitis. Specimens were tested for H. capsulatum IgG and IgM by enzyme immune assay and Histoplasma antigen. 147 of the 257 subjects who were enrolled had cryptococcal meningitis. Overall, 1.3% (2/151) of subjects were serum Histoplasma IgG positive, and zero of 151 were IgM positive. Antigen was not detected in any serum (n = 57), urine (n = 37, or CSF (n = 63) samples. Both subjects with serum Histoplasma IgG positivity had cryptococcal meningitis. Histoplasma capsulatum IgG was detected at low levels in persons with HIV/AIDS in Kampala, Uganda. Histoplasmosis is not widespread in Uganda but microfoci do exist. There appears to be no cross-reactivity between Cryptococcus neoformans and Histoplasma antigen testing, and cryptococcosis appears to be at most, a rare cause of positive Histoplasma IgG.
Assuntos
Histoplasmose/epidemiologia , Adulto , Anticorpos Antifúngicos/análise , Líquido Cefalorraquidiano/imunologia , Ensaio de Imunoadsorção Enzimática , Feminino , Infecções por HIV/complicações , Humanos , Imunoglobulina G/análise , Imunoglobulina M/análise , Masculino , Estudos Prospectivos , Estudos Soroepidemiológicos , Soro/imunologia , Uganda/epidemiologia , Urina/químicaRESUMO
INTRODUCTION AND OBJECTIVES: Encephalitozoon cuniculi is an obligate intracellular parasite infecting especially domestic rabbits; however, spontaneous infections have been documented in other mammalian species such as dogs, cats, rabbits, horses, cows and sheep all over the world. Encephalitozoonosis is a chronic and latent disease leading to renal failure, encephalitis, disorders of brain and urinary tract, and may lead to death. There are limited reports on encephalitozoonosis in wildlife, which is why the aim of this study was to detect the prevalence of antibodies to E. cuniculi in European hares. MATERIALS AND METHODS: Samples of blood sera from 701 wild hares from the Czech Republic (n = 245), the Slovak Republic (n = 211) and Austria (n = 245) were examined by indirect immunofluorescence antibody test (IFAT); samples with titer ≥ 40 were marked as positive. RESULTS: The total seroprevalence of E. cuniculi antibodies was 1.42% with titres in the range 40-640. Antibodies to E. cuniculi were detected in 2.9% (7/245), 0.8% (2/245) and 0.47% (1/211) hares from the Czech Republic, Austria and the Slovak Republic, respectively. CONCLUSIONS: This is the first detection of antibodies to E. cuniculi in hares from Europe showing that hares could be exposed to E. cuniculi infection, however with a low rate.
Assuntos
Encephalitozoon cuniculi/isolamento & purificação , Encefalitozoonose/veterinária , Lebres , Animais , Anticorpos Antifúngicos/análise , Áustria , República Tcheca/epidemiologia , Encefalitozoonose/epidemiologia , Encefalitozoonose/microbiologia , Técnica Indireta de Fluorescência para Anticorpo/veterinária , Prevalência , Estudos Soroepidemiológicos , Eslováquia/epidemiologiaRESUMO
Azole resistance in Aspergillus fumigatus is an emerging public health concern. Recently, a novel fungicide-driven mutation in the cyp51A gene and its promoter, TR46/Y121F/T289A, leading to high-level resistance to voriconazole has been identified in The Netherlands, Belgium, Germany, Denmark, Tanzania, and India in both clinical and environmental samples. Here we report the first description of A. fumigatus carrying this mutation in France, in a cystic fibrosis patient, underlining the need for extensive monitoring of Aspergillus resistance.
Assuntos
Antibacterianos/farmacologia , Aspergillus fumigatus/efeitos dos fármacos , Aspergillus fumigatus/genética , Azóis/farmacologia , Sistema Enzimático do Citocromo P-450/genética , Farmacorresistência Fúngica/genética , Proteínas Fúngicas/genética , Anticorpos Antifúngicos/análise , Aspergilose/microbiologia , Fibrose Cística/microbiologia , Europa (Continente) , França , Humanos , Imunoglobulina E/análise , Itraconazol/farmacologia , Masculino , Mutação/genética , Estudos Retrospectivos , Voriconazol/farmacologia , Adulto JovemRESUMO
Paracoccidioidomycosis (PCM), caused by the dimorphic fungus Paracoccidioides brasiliensis (Pb), is the most prevalent systemic mycosis in Latin America. There are few reports in the literature about the disease damages during pregnancy and the consequences to the fetuses and breeding. This study evaluated the implications of PCM during pregnancy on offspring and mothers in Wistar rats. Groups of rats were submitted to systemic Pb infection, by intraperitoneal infusion, and mated 30 days after the infection date. Immediately after birth, rats and neonates were sacrificed to obtain organs for standard histological examination, morphometric analysis, fungi recovery by plating (CFU) and dosing of anti-Pb antibodies by ELISA. There were no stillbirths or miscarriages, however, the fetuses from infected pregnant rats had lower body and organ weight but the fertility rate was 100%. The largest number of CFU was recovered from the organ of pregnant rats, the pathological examination revealed more severe infection in the same group, further on the largest number of granulomas and fungal field. It can be concluded that the PCM was more severe in the group of pregnant rats, with implications to the weight of offspring.
Assuntos
Anticorpos Antifúngicos/análise , Hepatopatias/microbiologia , Pneumopatias Fúngicas/microbiologia , Paracoccidioidomicose , Complicações Infecciosas na Gravidez/microbiologia , Animais , Animais Recém-Nascidos , Contagem de Colônia Microbiana , Modelos Animais de Doenças , Ensaio de Imunoadsorção Enzimática , Feminino , Granuloma do Sistema Respiratório/microbiologia , Granuloma do Sistema Respiratório/patologia , Hepatopatias/patologia , Pneumopatias Fúngicas/patologia , Tamanho do Órgão , Paracoccidioidomicose/patologia , Gravidez , Complicações Infecciosas na Gravidez/patologia , Ratos WistarRESUMO
Cryptococcus neoformans var. neoformans is an important fungal pathogen. The capsule is a well established virulence factor and a target site for diagnostic tests. The CPL1 gene is required for capsular formation and virulence. The protein product Cpl1 has been proposed to be a secreted protein, but the characteristics of this protein have not been reported. Here we sought to characterize Cpl1. Phylogenetic analysis showed that the Cpl1 of C. neoformans var. neoformans and the Cpl1 orthologs identified in C. neoformans var. grubii and C. gattii formed a distinct cluster among related fungi; while the putative ortholog found in Trichosporon asahii was distantly related to the Cryptococcus cluster. We expressed Cpl1 abundantly as a secreted His-tagged protein in Pichia pastoris. The protein was used to immunize guinea pigs and rabbits for high titer mono-specific polyclonal antibody that was shown to be highly specific against the cell wall of C. neoformans var. neoformans and did not cross react with C. gattii, T. asahii, Aspergillus spp., Candida spp. and Penicillium spp. Using the anti-Cpl1 antibody, we detected Cpl1 protein in the fresh culture supernatant of C. neoformans var. neoformans and we showed by immunostaining that the Cpl1 protein was located on the surface. The Cpl1 protein is a specific surface protein of C. neoformans var. neoformans.
Assuntos
Parede Celular/metabolismo , Cryptococcus neoformans/metabolismo , Proteínas Fúngicas/metabolismo , Animais , Anticorpos Antifúngicos/análise , Anticorpos Antifúngicos/imunologia , Parede Celular/química , Parede Celular/imunologia , Cryptococcus neoformans/química , Cryptococcus neoformans/genética , Cryptococcus neoformans/imunologia , Proteínas Fúngicas/genética , Proteínas Fúngicas/imunologia , Cobaias , Imunização , Filogenia , Transporte Proteico , CoelhosRESUMO
Chaetomium globosum is one of the most common fungi that grows in damp buildings and occurs in agricultural and forestry workplaces. Using sera from atopic patients, we characterized and purified an extracellular chitosanase (Chg47) from C. globosum that is antigenic to humans. The study reports the production of monoclonal antibodies to the protein. Three capture ELISAs were developed for Chg47 for detection of spores and spore and mycelial fragments in dust samples using different mono- and polyclonal antibody combinations. One method is based on an enhanced biotinylated polyclonal antibody as the secondary antibody and coating anti-IgM to capture one of two clones of IgM monoclonal antibodies as the capture antibody. The other method makes use of an enhanced rabbit polyclonal antibody as both the primary and capture antibody. The detection limit of the double PAb method for the Chg47 antigen was 7.6 pg/ml. When the anti-IgM+10B3 clone was used, the detection limit was 61 pg/ml and for anti-IgM+5F12, 122 pg/ml. The detection limit of double PAb method is comparable to methods for the allergen and spores of Aspergillus versicolor in house dust and is more sensitive than other immunoassays for allergens in house including for Stachybotrys chartarum, Aspergillus fumigatus and Alternaria alternata. All three methods had limited cross-reactivity to fungi common in house dust representing a diverse array of taxa.
Assuntos
Poluentes Atmosféricos/análise , Poluição do Ar em Ambientes Fechados/análise , Chaetomium/fisiologia , Poeira/análise , Monitoramento Ambiental , Esporos Fúngicos/isolamento & purificação , Alérgenos/análise , Animais , Anticorpos Anti-Idiotípicos/análise , Anticorpos Antifúngicos/análise , Anticorpos Monoclonais/análise , Chaetomium/imunologia , Reações Cruzadas , Ensaio de Imunoadsorção Enzimática , Proteínas Fúngicas/análise , Humanos , Imunoglobulina M/análise , Limite de Detecção , Coelhos , Sensibilidade e Especificidade , Esporos Fúngicos/imunologiaRESUMO
AIM: To determine the immunoreactivity of synthetic Cryptococcus-derived peptides. MATERIALS & METHODS: A total of 63 B-cell epitopes from previously identified Cryptococcus gattii immunoreactive proteins were synthesized and evaluated as antigens in ELISAs. The peptides were first evaluated for their ability to react against sera from immunocompetent subjects carrying cryptococcal meningitis. Peptides that yielded high sensitivity and specificity in the first test were then retested with sera from individuals with other fungal pathologies for cross-reactivity determination. RESULTS: Six of 63 synthetic peptides were recognized by antibodies in immunoassays, with a specificity of 100%, sensitivity of 78% and low cross-reactivity. CONCLUSION: We successfully determined the immunoreactivity of selected synthetic peptides of C. gattii derived proteins.
Assuntos
Proteínas de Bactérias/imunologia , Cryptococcus gattii/imunologia , Peptídeos/imunologia , Anticorpos Antifúngicos/análise , Anticorpos Antifúngicos/imunologia , Proteínas de Bactérias/genética , Criptococose/imunologia , Criptococose/microbiologia , Cryptococcus gattii/genética , Ensaio de Imunoadsorção Enzimática , Epitopos de Linfócito B/imunologia , Humanos , Peptídeos/síntese química , Peptídeos/químicaRESUMO
A 33-year-old homosexual Japanese man who admitted to having sex with men presented with a two-week history of dyspnea and fever. Chest imaging showed diffuse pulmonary frosted-glass-like shadows. A blood test revealed positive HIV antibodies with a CD4 cell count of 66/µL. Bronchoalveolar lavage identified pneumocystis. Although the patient exhibited a transient response to anti-pneumocystis treatment and mega-dose steroid pulse therapy, he eventually died from respiratory failure. An autopsy suggested massive cytomegalovirus and pneumocystis pneumonitis. The pulmonary co-infection with cytomegalovirus may have been worsened by the use of mega-dose steroids, and such therapy should be avoided in patients with a high HIV viral load and low CD4 count.
Assuntos
Síndrome da Imunodeficiência Adquirida/diagnóstico , Coinfecção , Infecções por Citomegalovirus/diagnóstico , HIV , Pneumonia por Pneumocystis/diagnóstico , Síndrome da Imunodeficiência Adquirida/virologia , Adulto , Anticorpos Antifúngicos/análise , Anticorpos Antivirais/análise , Citomegalovirus/imunologia , Infecções por Citomegalovirus/virologia , Diagnóstico Diferencial , Evolução Fatal , Humanos , Masculino , Pneumocystis/imunologia , Pneumonia por Pneumocystis/microbiologia , Tomografia Computadorizada por Raios XRESUMO
BACKGROUND: Atopic dermatitis (AD) is a common chronic inflammatory skin disease. Malassezia, the predominant skin microbiota fungus, is considered to exacerbate AD, especially in a subset of patients with head and neck type AD (HNAD). In the present study, the relationship between AD and sensitization to Malassezia antigens was investigated. METHODS: We assessed 173 patients with AD. The severity of eczema was determined with Eczema Area and Severity Index (EASI); the type of AD, namely, head and neck type, was reported as well. The total serum IgE and specific IgE to Malassezia were determined and correlated with clinical picture of AD, sex, age, and the EASI. RESULTS: Total IgE was elevated in 77.7% of patients. Specific IgE to Malassezia was positive (≥0.35 kU/L) in 49.1% of patients. Men were significantly more often sensitized to Malassezia antigen (58% of men vs 42% of women; P value, 0.04). Concurrently, 58% of patients with HNAD versus 42% non-HNAD patients had higher levels of specific IgE to Malassezia, this difference being nearly significant (P value, 0.06). Patients with atopy were also more frequently sensitized to Malassezia. No significant relationship between EASI and the level of total IgE or specific IgE to Malassezia was observed. CONCLUSIONS: In our population, IgE-mediated sensitization was found in up to 49% of all patients with AD, most common in men and in head and neck type.
Assuntos
Anticorpos Antifúngicos/imunologia , Dermatite Atópica/epidemiologia , Dermatite Atópica/imunologia , Dermatomicoses/epidemiologia , Dermatomicoses/imunologia , Imunoglobulina E/imunologia , Malassezia/imunologia , Adolescente , Adulto , Distribuição por Idade , Idoso , Idoso de 80 Anos ou mais , Anticorpos Antifúngicos/análise , Criança , Dermatite Atópica/diagnóstico , Feminino , Alemanha , Cabeça , Humanos , Imunoglobulina E/análise , Masculino , Pessoa de Meia-Idade , Pescoço , Testes do Emplastro/métodos , Prognóstico , Valores de Referência , Índice de Gravidade de Doença , Distribuição por Sexo , Fatores SexuaisRESUMO
The aim of this study was to investigate the prevalence of Encephalitozoon cuniculi antibodies in healthy and diseased rabbits in Germany. Age and gender dependencies were taken into consideration. The sensitivity of the E cuniculi antibody test and its relevance for the diagnosis of E cuniculi infection in rabbits was also examined. A total of 773 healthy and diseased rabbits were tested for E cuniculi antibodies (indirect immune fluorescence antibody test (IFAT) or carbon immunoassay (CIA). No differences between diseased and healthy rabbits were observed with regard to gender, but diseased rabbits were significantly older (P>0.001). Forty-three percent (336/773) of all rabbits were positive for E cuniculi antibodies. Of the diseased rabbits, 48 per cent (266/555) were positive for E cuniculi antibodies. While 96 per cent (91/95) of the rabbits with histopathologically or PCR confirmed encephalitozoonosis were E cuniculi antibody-positive, only 60 per cent (144/241) of the rabbits suspected of E cuniculi infection were antibody-positive. Of the healthy rabbits, 18 per cent (39/218) were positive for E cuniculi antibodies. Diseased rabbits were almost three times more likely to be E cuniculi antibody-positive than healthy ones (P>0.001; relative risk (RR): 2.68; 95% CI 1.99 to 3.61). The sensitivity of the E cuniculi antibody test was 96 per cent.