Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 3 de 3
Filter
Add filters








Year range
1.
J. Health Biol. Sci. (Online) ; 5(2): 121-129, abr-jun /2017. ilus, graf
Article in English | LILACS | ID: biblio-875675

ABSTRACT

Introduction: Immunoglobulins, soluble antigens, cells, cytokines and other immune system products can be transferred from infected mother to her offspring, leading to suppression or stimulation of immune response. Objective: To evaluate the influence of gender and maternal infection with Leishmania braziliensis in the course of the disease in the offspring of hamsters. Methods: Offspring born from infected mother (IMO) or non-infected mother (NIMO) by Leishmania braziliensis, both sexes, was infected with the same strain of the mother after 30 days of life and followed for 18 weeks. We evaluated the thickness of the lesion, parasite load and histology of the lesions. Results: The number of parasite in both lesions and lymph node of IMO offspring showed a significant reduction in the 5th week post-infection compared to the NIMO offspring; however, this did not correspond to clinical symptoms. Histopathological analysis revealed that in the IMO offspring, the inflammatory process was more prominent. In relation to gender, it was observed that the male offspring showed lesion thickness and higher parasite burden than females. Conclusion: Maternal infection by L. braziliensis in hamsters does not appear to influence the course of the disease in the homologous offspring infection, as well as the male offspring presented augmented susceptibility to L. braziliensis infection regardless of whether they were born from IMO or NIMO. Also, the reduction of the granuloma index in the IMO offspring, together with the higher inflammatory response, suggests a less effective cellular response in the chronic phase of the disease in these animals. (AU)


Introdução: Imunoglobulinas, antígenos solúveis, células, citocinas e outros produtos do sistema imune podem ser transferidos de mãe infectada para a sua prole, levando à supressão ou estimulação da resposta imune. Objetivo: Avaliar a influência do gênero e a infecção materna por Leishmania braziliensis no curso da doença na prole de hamsters. Métodos: Filhotes nascidos de mãe infectada (MI) e mãe não infectada (MNI) por L. braziliensis, ambos os sexos, foram infectados com a mesma cepa da mãe após 30 dias de vida e acompanhados por 18 semanas. Avaliou-se a espessura da lesão, a carga parasitária e os aspectos histopatológicos das lesões. Resultados: A carga parasitária (lesões e linfonodo de drenagem das lesões) da prole nascida de MI mostrou diminuição significativa na 5a semana pós-infecção, comparada àquela nascida de MNI, no entanto, esta diminuição não correspondeu aos sintomas clínicos. A análise histopatológica revelou que na prole nascida de MI, o processo inflamatório mostrou-se mais proeminente. Em relação ao gênero observou-se que os filhotes machos apresentaram espessura das lesões e carga parasitária maiores do que as fêmeas. Conclusão: A infecção materna por L. braziliensis parece não influenciar o curso da doença na infecção homóloga da prole, bem como os filhotes machos apresentaram aumentada susceptibilidade à infecção por L. braziliensis, independente se eles nasceram de MI ou MNI. Além disso, a redução no index de granulomas na prole nascida de MI, em conjunto com a maior resposta inflamatória, sugere uma resposta celular menos efetiva na fase crônica da doença nestes animais. (AU)


Subject(s)
Leishmania braziliensis , Cricetinae , Infections
2.
Braz. j. infect. dis ; 14(5): 476-482, Sept.-Oct. 2010. ilus, tab
Article in English | LILACS | ID: lil-570562

ABSTRACT

The initial encounter of Leishmania with its host's immune system is important in the outcome of infection. Previous studies have shown that PBMCs from healthy volunteers (HV) exposed to Leishmania differ in IFN-γ production. We have expanded such observations evaluating the profile and kinetics of cytokines (IFN-γ, IL-12p70, IL-10, IL-13), chemokines (CCL5, CCL3, CCL4, CXCL10), and chemokine receptors (CCR1,CCR5, CXCR3, CCR4) in vitro L. amazonensis-stimulated of HV's PBMCs. HVs were divided in groups of high (HR) or low (LR) IFN-γ responders. In both groups, HR and LR, after L. amazonensis infection there was a predominance of IL-10 and IL-13 over IFN-γ production, while IL-12 was produced in similar amount. Regarding chemokines, a more striking difference was observed for CCL3 expression that was lower at 12 hours and 48 hours post infection in LR than in HR. Interestingly, a downregulation of CCR5 and a greater expression of CCR4 were found in low IFN-γ responders. These data suggest that early after L. amazonensis infection there is a cytokine milieu dominated by IL-13 and IL-10, and despite of this environment, IFN-γ is produced, supporting the complexity of the response. It is noteworthy that the pattern of immune response is mounted in first hours after Leishmania stimulation, with the definition of the differentiation of Th1 versus Th2 cells. It remains to be determined if such an in vitro difference has an in vivo counterpart in terms of susceptibility to infection.


Subject(s)
Humans , Host-Parasite Interactions/immunology , Immunity, Humoral/immunology , /biosynthesis , /biosynthesis , Leishmania mexicana/immunology , Leukocytes, Mononuclear/parasitology , Cytokines/biosynthesis , DNA, Protozoan/analysis , Enzyme-Linked Immunosorbent Assay , /immunology , /immunology , Leishmania mexicana/physiology , Leukocytes, Mononuclear/immunology , Reverse Transcriptase Polymerase Chain Reaction , RNA, Protozoan/analysis
3.
Cad. saúde colet., (Rio J.) ; 18(1)jan.-mar. 2010.
Article in Portuguese | LILACS-Express | LILACS | ID: lil-621266

ABSTRACT

Este estudo avalia o Sistema de Informação para a Infância e Adolescência (SIPIA), a partir das notificações de violência sexual do SIPIA local e dos registros dos Conselheiros Tutelares, naRegião Metropolitana de Fortaleza, no período de 1999 a 2007. É um estudo seccional, em que se analisou dados de 170 questionários ?pareados?, de um total de 1.070 notificações encontradas,preenchidos com informações dos registros escritos dos Conselhos Tutelares e do SIPIA, os quais foram utilizados em análise comparativa, para a avaliação do sistema. As variáveis foram analisadas em relação à incompletitude (ausência da informação) e quanto ao númerode informações concordantes. Também foi estimada a proporção de sub-registro no sistema (77,7%). A variável cor teve um elevado percentual de incompletitude nos registros (83,5%), sendo também significativa a ausência de informações para as variáveis relativas às medidasaplicadas, encaminhamentos e solicitação de serviços públicos, tanto nos registros quanto no sistema. Obteve-se concordância ótima e boa nas variáveis: sexo (k=0,93); data de nascimento (k=0,89) e vínculo do agente violador (k=0,63). Embora o SIPIA propicie uma análise da situação das crianças e adolescentes brasileiros quanto às violações de direito, sua baixa cobertura fragiliza o seu uso na tomada de decisões.


This study evaluates the Sistema de Informações para Infância e Adolescência (Childhood and Adolescence Information System - SIPIA), based on the notifications of sexual violence from the local SIPIA and the records of the Guardian Counselors, in Fortaleza city and its outskirts, inthe period from 1999 to 2007. It is a sectional study, in which data from 170 matched questionnaires, of a total of 1.070 notifications found, filled out with information from the written records of the Guardian Council and SIPIA, used in comparative analysis for the evaluation of the system, were analyzed. The variables were analyzed in relation to incompleteness(absence of information) and the amount of concordant information. The sub-registration proportion in the system (77.7%) was also estimated. The color variable had a high incompleteness percentage (83.5%) in the records, being also significant the absence of information for the variables regarding the applied measures, forwarding, and requests forpublic services, in both the records and the system. Excellent and good agreement in was obtained in the following variables: gender (k=0.93); date of birth (k=0.89) and the violator acquaintance to the victim (k=0.63). Although SIPIA allows an analysis of the situation of Brazilian children and adolescents regarding violation of rights, its low coverage undermines its use in decision making.

SELECTION OF CITATIONS
SEARCH DETAIL