ABSTRACT
Accidents caused by spiders of the genus Loxosceles constitute an important public health problem in Brazil. The venom of Loxosceles sp induces dermonecrosis at the bite site and systemic disease in severe cases. Traditional medicine based on plant-derived products has been proven to reduce the local effects of envenomation. The present study verified the healing effects of copaiba oil on lesions induced by the venom of L. intermedia. Methods: Cutaneous lesions were induced on the backs of rabbits by intradermal injection of L. intermedia venom. Copaiba oil was applied topically 6 hours after injection; the treatment was repeated for 30 days, after which animal skins were removed and processed for histopathological analysis. Blood samples were also collected before and 24 hours after venom inoculation to measure the hematological parameters. Results: Compared to the control group, the platelet count was reduced significantly in all groups inoculated with venom, accompanied by a decreased number of heterophils in the blood. The minimum necrotic dose (MND) was defined as 2.4 μg/kg. Topical treatment with copaiba oil demonstrated a differentiated healing profile: large skin lesions were observed 10 days after venom inoculation, whereas formation of a thick crust, without scarring was observed 30 days after venom inoculation. Histopathological analysis showed no significant difference after treatment. Nevertheless, the copaiba oil treatment induced a collagen distribution similar to control skin, in marked contrast to the group that received only the spider venom injection. Conclusions: We conclude that copaiba oil may interfere in the healing process and thus propose it as a possible topical treatment for cutaneous lesions induced by L. intermedia venom.(AU)
Subject(s)
Spider Venoms , Spiders , Fabaceae/adverse effects , Poisoning , Bites and StingsABSTRACT
A penetração do antígeno pela mucosa intestinal pode resultar em duas situações distintas: a tolerância oral, onde se verifica uma redução na resposta imunológica sistêmica, e a alergia alimentar que é caracterizada pelo desenvolvimento de uma resposta imuno sistêmica para o antígeno em questão. As manifestações clínicas alérgicas de ambos os fenômenos são semelhantes e podem culminar na doença inflamatória intestinal em jovens e adultos. Baseado nestes achados, o objetivo principal foi avaliar se camundongos das linhagens Balb/c e C57BL/6 se tornariam sensíveis (alérgicos) para os antígenos do amendoim através da exposição oral...Os animais que receberam por via oral a semente de amendoim no período de perisdesmame não se sensibilizaram a esta proteína quando ofertada in natura no período de desafio oral na vida adulta.