Autor(es):
Lima, Luciana Vieira do R. ; Carneiro, Liliane Almeida ; Campos, Marliane Batista ; Santos, Thiago Vasconcelos dos ; Ramos, Patricia Karla ; Laurenti, M?rcia Dalastra ; Teixeira, Claudio Eduardo C. ; Silveira, Fernando Tobias
Data: 2017
Origem: Oasisbr
Assunto(s): Leishmania infantum / parasitologia; Leishmania infantum / patogenicidade; Leishmaniose Visceral / patogenicidade; Leishmaniose Visceral / parasitologia; C?es / parasitologia; Imunoglobulina G / imunologia; Ensaio de Imunoadsor??o Enzim?tica / m?todos
Descrição
This research was supported by the Evandro Chagas Institute (Ministry of Health, Brazil) and Nucleus of Tropical Medicine (Federal University of Par? State, Brazil).
Minist?rio da Sa?de. Secretaria de Vigil?ncia em Sa?de. Instituto Evandro Chagas. Ananindeua, PA, Brasil.
Minist?rio da Sa?de. Secretaria de Vigil?ncia em Sa?de. Centro Nacional de Primatas. Ananindeua, PA, Brasil.
Minist?rio da Sa?de. Secretaria de Vigil?ncia em Sa?de. Instituto Evandro Chagas. Ananindeua, PA, Brasil.
Minist?rio da Sa?de. Secretaria de Vigil?ncia em Sa?de. Instituto Evandro Chagas. Ananindeua, PA, Brasil.
Minist?rio da Sa?de. Secretaria de Vigil?ncia em Sa?de. Instituto Evandro Chagas. Ananindeua, PA, Brasil.
University S?o Paulo. Medical School of S?o Paulo. Pathology Department. S?o Paulo, SP, Brazil.
Minist?rio da Sa?de. Secretaria de Vigil?ncia em Sa?de. Instituto Evandro Chagas. Ananindeua, PA, Brasil / Federal University of Par?. Tropical Medicine Nucleus. Bel?m, PA, Brazil.
We present here a cross-sectional study analyzing the IgG1 and IgG2 immune responses to natural canine Leishmania (L.) infantum chagasi-infection and their relationships with delayed-type hypersensitivity (DTH) in 50?mongrel dogs with previous positive serodiagnoses (IFAT-IgG) (56% with subclinical status [=?apparently healthy] and 44% clinically sick), living in endemic areas for visceral leishmaniasis in the Brazilian Amazon. IgG1 and IgG2 responses were measured using commercial polyclonal antibodies in ELISA, while DTH was elicited by intradermal skin test using cultured promastigotes L. (L.) i. chagasi-antigen. Data analyses used Chi-square and Pearson's r coefficient (95% confidence interval). Regarding DTH and the clinical statuses of dogs, it was noted that 100% of the animals showing positive DTH (n?=?8) were from the subclinical group, while 100% showing negative DTH were from the clinically sick group; higher IgG2 than IgG1 responses were observed in both clinical groups. However, when this comparison was made between the subclinical and sick groups, higher IgG1 responses were noted in the dogs from the sick rather than the subclinical group, while no differences were noted between the IgG2 responses in the dogs from both clinical groups. Additionally, we found lower IgG1 responses in dogs from the subclinical group showing positive DTH than in the dogs from the subclinical or sick groups with negative DTH; no differences were found between the IgG2 responses of these two clinical groups. These findings suggest that the IgG1, but not the IgG2, response is associated with susceptibility to canine visceral leishmaniasis (CVL).
