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1.
Semina ciênc. agrar ; 28(2): 287-294, abr.-jun. 2007. ilus, tab
Article in Portuguese | LILACS | ID: lil-464698

ABSTRACT

A paracoccidioidomicose (PCM) é uma micose sistêmica, restrita à América Latina, com maior incidência noBrasil. O camundongo ddY tem sido empregado como modelo murino de PCM e, no entanto, não há informaçõesa respeito da resposta imune desse animal frente à infecção. O presente estudo tem como objetivo avaliar aresposta imune humoral específica para o principal antígeno, gp43, do fungo Paracoccidioides brasiliensis,em camundongos ddY infectados com a cepa virulenta Pb 18. Foram realizadas análises da antigenemia ehistopatológico em vários órgãos e em diferentes tempos pós-infecção. Os resultados obtidos demonstraramaumento nos níveis de IgG anti-gp43 nos dias 14, 17, 21, 24, 28 e 56 pós-infecção e aumento no nível de gp43solúvel aos 28 dias pós-infecção. As células fúngicas foram detectadas em todos os órgãos analisados(cérebro, coração, pulmão, fígado, baço e rim) e em todos os períodos. As lesões granulomatosas tornaramsepredominantes 14 dias pós-infecção. Os resultados evidenciaram que o camundongo ddY produz respostaimune humoral frente ao principal antígeno de P. brasiliensis, apresentando-se elevado até 56 dias pósinfecção.A redução do nível de gp43 solúvel na fase crônica, supostamente devido ao início do controle dainfecção, requer estudos complementares adicionais.


Paracoccidioidomycosis (PCM) is a systemic mycosis, restrict to Latin America, with higher incidence inBrazil. ddY mice have been used as experimental PCM model, although there is no data regarding immuneresponse. The aim of the present study was evaluated specific humoral response against the main specificantigen of the fungal Paracoccidioides brasiliensis, the gp43, in ddY mice infected with virulent Pb 18.Antigenemia analysis and histophatological exam in several organs were performed in different time post-infection The results showed increased levels of anti-gp43 IgG on days 14, 17, 21, 24, 28 and 56 post-infectionand increased levels of soluble gp-43 on day 28 post-infection. The fungal cells were detected in all organsanalyzed (brain, heart, lung, liver, spleen and kidney) in all investigated periods. The granulomatous lesionsbecame predominant 14 days after infection. The results evidence that ddY mice produce humoral immuneresponse to main P. brasiliensis antigen, with high levels until 56 days after infection. Further studies areneeded to show that reduction of soluble gp43 in chronic phase correlates with infection control.


Subject(s)
Mice , Immunity, Mucosal , Paracoccidioidomycosis
2.
Rev. panam. infectol ; 8(4): 16-20, oct.-dic. 2006. graf
Article in Portuguese | LILACS | ID: lil-505578

ABSTRACT

Os métodos fenotípicos tradicionais e os testes comerciais utilizados na identificação das espécies do gênero Candida são úteis na averiguação da colonização oral, especialmente se utilizados em conjunto. O presente estudo foi realizado no Hospital de Clínicas da Unicamp com o objetivo de averiguar a diversidade das espécies de Candida na cavidade oral de 225 pacientes gravemente enfermos, internados nas unidades de Moléstias Infecciosas, Cirurgia do Trauma, Emergência Clínica e Transplante de Medula Óssea. A coleta do material ocorreu quinzenalmente no período compreendido entre novembro de 2000 e dezembro de 2002. Foram utilizados cinco testes: temperatura de crescimento, assimilação da xilose, CHROMagar Candida®, Candida Check® e ID 32®. Dentre os 349 “swabs” orais colhidos, obtiveram-se 141/349 (40,4%) culturas positivas de 126/225 (56,0%) pacientes. Os resultados obtidos com o teste de CHROMagar Candida® deixaram dúvidas quanto à diferenciação entre as amostras de C. albicans e C. dubliniensis, mas os demais testes confirmaram a ausência dessa segunda espécie. A espécie predominante detectada no presente estudo foi C. albicans, com 91 (64,5%), seguida de C. tropicalis com 17 (12,0%), C. glabrata com 9 (6,4%), C. parapsilosis com 7 (5,0%), C. krusei com 6 (4,2%), C. lusitaniae 5 (3,5%) e C. humicola, C. norvegiensis e C. kefyr com 2 (1,4%) cada. Os dados obtidos indicam que o conjunto de testes utilizados foi útil e suficientemente discriminatório na determinação das espécies colonizadoras da cavidade oral dos pacientes em estudo.


Subject(s)
Humans , Adult , Candida/isolation & purification , Candidiasis, Oral/epidemiology , Candidiasis, Oral/microbiology , Candida/classification , Cross-Sectional Studies
3.
Basic & Clinical Medicine ; (12)2006.
Article in Chinese | WPRIM | ID: wpr-596189

ABSTRACT

Objective Cryptococcus neoformans var.grubii isolates from 6 different cities in our country using multilocus microsatellite typing(MLMT) method were genotyped to explore the genotypic distribution of the variety.Methods The DNA of forty-three isolates of Cryptococcus neoformans var.grubii was extracted.The DNA fragments covering microsatellite loci CNG1,CNG2 and CNG3 were amplified using PCR,and then sequenced.The numbers of each motif repeat in 3 microsatellite regions("TA" repeats for CNG1,"GA" repeats for CNG2,and "CAT" repeats for CNG3) were calculated.According to the repeat numbers of these motif,the MLMT types of 43 strains of Cryptococcus neoformans var.grubii were determined.Results Out of 43 isolates,the percentage of MLMT-17 was 83.72%.In the clinical and environmental isolates,the percentages of MLMT-17 were 86.67% and 70%,respectively.Two new genotypes MLMT-39 and-40 were found.Conclusion MLMT-17 of Cryptococcus neoformans var.grubii is prevalent in both clinical and community environment in China.Implying the most clinical strains which resulted in cryptococcosis originated from indigenous environmental strains.

4.
Journal of Third Military Medical University ; (24)1983.
Article in Chinese | WPRIM | ID: wpr-567079

ABSTRACT

Objective To understand the genotype distribution of clinical Cryptococcus neoformans var.grubii strains from China and Brazil using multilocus microsatellite typing(MLMT) method and to study the difference in their MLMT genotyping.Methods DNA was extracted from the identified 69 clinical Cryptococcus neoformans var.grubii strains.DNA fragments covering microsatellite loci(CNG1,CNG2,and CNG3) were amplified by PCR and sequenced.The number of each motif repeats in 3 microsatellite regions("TA","GA",and "CAT" repeats for CNG1,CNG2,and CNG3,respectively) was calculated.The MLMT types of 69 clinical Cryptococcus neoformans var.grubii strains were determined according to the repeat number of different motifs.Data were analyzed using SPSS 11.5 software.Results Five genotypes were identified in 33 clinical strains from China.Of these strains,29 were MLMT-17,accounting for 87.88% of the total strains.Ten genotypes were identified in 36 clinical strains from Brazil.Of the 36 strains,19 were MLMT-13,accounting for 52.78% of the total strains.Conclusion The difference is great in major genotype distributions of the clinical Cryptococcus neoformans var.grubii strains from China and Brazil.The genotype of clinical strains from Brazil is diversely distributed.

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