Estudo dos efeitos de extratos de glândulas salivares de fêmeas de Rhipicephalus sanguineus (Latreille, 1806) (Acari : Ixodidae) na resposta imunológica de hospedeiros pós inoculadores
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Data
2011-02-22
Autores
Hebling, Letícia Maria Gráballos Ferraz [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Este estudo abordou os efeitos de extratos de glândulas salivares de fêmeas de Rhipicephalus sanguineus com 2, 4 e 6 dias de alimentação (EGS2-EGS6) em coelhos New Zealand White virgens de infestação inoculados três vezes a intervalos de 21 dias. Os animais inoculados foram desafiados com carrapatos R. sanguineus, para verificar a influência dos extratos sobre a resposta imune-inflamatória dos hospedeiros. Foram estudadas as alterações histopatológicas na pele dos hospedeiros na região da lesão de fixação dos carrapatos, os parâmetros alimentar e reprodutivo das fêmeas obtidas da infestação desafio, bem como suas glândulas salivares aos 2, 4 e 6 dias de alimentação. Para obtenção dos extratos glandulares utilizou-se 55 fêmeas (110 glândulas salivares) com 2 dias de alimentação, 36 (72 glândulas) com 4 dias e 25 (50 glândulas) com 6 dias, de onde obteve-se os extratos: EGS2, a partir de glândulas salivares de fêmeas com 2 dias de alimentação; EGS4 com 4 dias, e, EGS6 com 6 dias. Os resultados revelaram que os diferentes extratos glandulares estimularam o desenvolvimento de resposta imuneinflamatória na pele dos hospedeiros comprometendo os processos alimentar e reprodutivo das fêmeas dos carrapatos. Os hospedeiros do grupo GT (EGS4) mostraram a formação de um intenso e precoce infiltrado de células inflamatórias sinalizando que este foi o extrato mais eficaz no desenvolvimento da resposta imune-inflamatória local. Por outro lado, a resposta dos hospedeiros do grupo GT (EGS6) à infestação foi mais tardia e com menor ocorrência desse infiltrado. Já o processo inflamatório local nos hospedeiros do GT (EGS2) foi o menos intenso. O teste de desafio mostrou médias para os parâmetros alimentar e reprodutivo das fêmeas oriundas da infestação desafio que não foram significativamente diferentes, com exceção do peso médio de ingurgitamento das fêmeas...
This study addressed the effects of salivary glands extracts of Rhipicephalus sanguineus females with 2, 4 and 6 days of feeding (EGS2-EGS6) in New Zealand White rabbits naive inoculated three times at intervals of 21 days. The inoculated animals were challenged with R. sanguineus ticks to verify the influence of extracts on the host’s immune-inflammatory response. Changes in the hosts’ skin at the feeding lesion, feeding and reproductive parameters as well salivary glands with 2, 4 and 6 days of feeding of females obtained from the challenge infestation were studied. To obtain the glandular extracts, we used 55 females (110 salivary glands) with 2 days of feeding, 36 (72 glands) with 4 days and 25 (50 glands) with 6 days, which were obtained the extracts: EGS2, from salivary glands of females with two days of feeding; EGS4 with 4 days and EGS6 with 6 days. The results revealed that the different glandular extracts stimulated the development of immune-inflammatory response in the hosts’ skin compromising the feeding and reproductive processes of the female ticks. The hosts of the TG group (EGS4) showed the formation of an early and intense infiltration of inflammatory cells, indicating that this extract was more effective in developing the local inflammatory-immune response. On the other hand, the response of the TG group hosts (EGS6) to the infestation was delayed and with lower incidence of this infiltrate. The local inflammatory process in the GT hosts (EGS2) was the less intense. The challenge test showed averages for feeding and reproductive parameters of females from infestation challenge that were not significantly different, with the exception of the engorgement average weight of females from TG group (EGS6). However, it was considered that these differences occurred because of the responses developed by the hosts, since the histopathology of the skin... (Complete abstract click electronic access below)
This study addressed the effects of salivary glands extracts of Rhipicephalus sanguineus females with 2, 4 and 6 days of feeding (EGS2-EGS6) in New Zealand White rabbits naive inoculated three times at intervals of 21 days. The inoculated animals were challenged with R. sanguineus ticks to verify the influence of extracts on the host’s immune-inflammatory response. Changes in the hosts’ skin at the feeding lesion, feeding and reproductive parameters as well salivary glands with 2, 4 and 6 days of feeding of females obtained from the challenge infestation were studied. To obtain the glandular extracts, we used 55 females (110 salivary glands) with 2 days of feeding, 36 (72 glands) with 4 days and 25 (50 glands) with 6 days, which were obtained the extracts: EGS2, from salivary glands of females with two days of feeding; EGS4 with 4 days and EGS6 with 6 days. The results revealed that the different glandular extracts stimulated the development of immune-inflammatory response in the hosts’ skin compromising the feeding and reproductive processes of the female ticks. The hosts of the TG group (EGS4) showed the formation of an early and intense infiltration of inflammatory cells, indicating that this extract was more effective in developing the local inflammatory-immune response. On the other hand, the response of the TG group hosts (EGS6) to the infestation was delayed and with lower incidence of this infiltrate. The local inflammatory process in the GT hosts (EGS2) was the less intense. The challenge test showed averages for feeding and reproductive parameters of females from infestation challenge that were not significantly different, with the exception of the engorgement average weight of females from TG group (EGS6). However, it was considered that these differences occurred because of the responses developed by the hosts, since the histopathology of the skin... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Ácaro, Glandulas salivares, Inoculação, Imunização, Relação parasita-hospedeiro, Extratos de glândulas salivares, Ciclo secretor
Como citar
HEBLING, Letícia Maria Gráballos Ferraz. Estudo dos efeitos de extratos de glândulas salivares de fêmeas de Rhipicephalus sanguineus (Latreille, 1806) (Acari : Ixodidae) na resposta imunológica de hospedeiros pós inoculadores. 2011. 152 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2011.