Effects of copaiba oil on dermonecrosis induced by Loxosceles intermedia venom

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abril 26, 2019

Mara Fernandes Ribeiro, Felipe Leite de Oliveira, Aline Moreira Souza, Thelma de Barros Machado, Priscilla Farinhas Cardoso, Andrea Patti Sobrinho, Angélica Silveira Nascimento, Cláudio Maurício Vieira de Souza, Sabrina Calil Elias

Journal of Venomous Animals and Toxins including Tropical Diseases 2019;25:e149318
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992019000100310&lng=en&nrm=iso&tlng=en | © The Author(s). 2019
Received: August 23, 2018 | Accepted: February 1, 2019 | Published: April 25, 2019

ABSTRACT

Background

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.

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KEYWORDS

Loxosceles intermedia
venom
skin lesion
copaiba oil
topical treatment
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