Acute and sub chronic toxicity study of aqueous extract from the leaves and branches of Campomanesia velutina (Cambess) O. Berg.
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2017
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Ethnopharmacological relevance: Campomanesia velutina leaves and branches infusions are used in Brazilian
folk medicine to treat diarrhea and to ameliorate intestinal cramps, respectively.
Aim of the study: Carry out the acute and sub chronic pre-clinical evaluation and thus assess the safety and
toxicological potential of the specie.
Materials and methods: In vivo toxicity was evaluated by acute and sub chronic toxicity assays conducted
according to the guidelines of the Brazilian Agency of National Health Surveillance (Agência Nacional de
Vigilância Sanitária – ANVISA). For acute toxicity evaluation, a single dose of aqueous extracts from the leaves
(AEL) and branches (AEB) of Campomanesia velutina were orally administered to mice at doses of 300, 600
and 1200 mg/kg. Then, the animals were observed for 14 days. In the sub chronic study, the extracts were orally
administered to mice for 14 days at doses of 300, 600 and 1200 mg/kg. To assess the toxicological effects,
animals were closely observed on general behavior, clinical signs of toxicity, body weight, food and water intake.
At the end of the experiment, it was performed biochemical and hematological evaluations, as well as
histopathological analysis from the following organs: brain, heart, lungs, liver, stomach, small intestine (section)
and left kidney. Preliminary phytochemical analysis was performed using thin layer chromatography (TLC) and
colorimetric pharmacognostic tests.
Results: In oral acute assay, treatment with AEB at the major dose (1200 mg/kg) caused diarrhea, abdominal
cramps and tremors in females. These effects were reversed at 4th hour. Normochromic normocytic anemia was
observed in males treated with AEL 300 mg/kg and AEB 600 and 1200 mg/kg as well as in females treated with
AEB 300 and 1200 mg/kg. The kidney of all treated animals showed moderate inflammation and a few hemorrhagic
points. In sub chronic assay, treatment with AEL 600 mg/kg, AEL 1200 mg/kg and AEB 1200 mg/kg caused hyper
excitability in females that was not reversed. Treatments also had impact on weight gain and the relative weight of
males’ brain was increased on group treated with AEL 300 mg/kg, AEB 300 and AEB 1200 mg/kg. Although
changes in hematological parameters were not observed, serum creatinine levels were significantly higher in males
treated with AEB 300 mg/kg. Besides, the heart of all treated animals showed intense hyperemia. Preliminary
phytochemical analysis revealed the presence of flavonoids, tannins and phenolic compounds.
Conclusions: Toxicity signs were mainly observed after treatment with AEL and AEB at the two highest tested
doses (600 and 1200 mg/kg), suggesting that the extracts are relatively safe at its effective dose (300 mg/kg).
However, alterations on hematological and biochemical parameters and on the kidney and heart of the animals
were not closely related with the dose, implying caution on its use.
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ARAÚJO, M. C. P. M. et al. Acute and sub chronic toxicity study of aqueous extract from the leaves and branches of Campomanesia velutina (Cambess) O. Berg. Journal of Ethnopharmacology, v. 201, p. 17-25, 2017. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0378874116315410?via%3Dihub>. Acesso em: 15 set. 2017.