Investigação do potencial toxicológico e atividades farmacológicas de Vernonia polyanthes Less (Asteraceae)

Abstract

Vernonia polyanthes Less, Asteraceae family, popularly known in Brazil as assa-peixe, has been used to treat diseases of the respiratory tract, kidney and gastrointestinal problems, wounds, fractures and sprains, bruises and dislocations, and also indicated as tonic, emmenagogue, diuretic and healing. The aim of this work was to investigate the toxicological potential and topical anti-inflammatory and healing activities and develop a dermatological cream from the ethanol extract of V. polyanthes leaves. Dried and powdered leaves were extracted in ethanol PA by static maceration for obtaining dry ethanol extract (EEVP) using a rotaevaporator. Parameters Biochemical, hematologic, morphological and histopathological were determined in Wistar rats after 15 and 30 days of treatment orally with 100, 200 and 400 mg/kg EEVP. Dermatological cream of EEVP (cEEVP) was developed at the concentrations of 0.10, 0.25 and 0.50% and evaluated through stability study. The topical anti-inflammatory activity of cEEVP was assessed by ear edema induced by croton oil, phenol and arachidonic acid, while the wound healing activity was performed by cutaneous lesions test using EEVP and cEEVP. Histopathological analysis and evaluation of the myeloperoxidase (MPO) and N-acetyl-β-D-glicorominidase (NAG) activities were also determined. In the evaluation of toxicity, EEVP did not modify the biochemical, hematological and histopathological parameters, but promoted alterations in lipid and liver enzymes levels. The cEEVP showed adequate conformities in the stability study and together with the EEVP demonstrated topical anti-inflammatory and wound healing effects. The results may contribute to the National Policy of Medical Plants and Herbal through the dissemination of knowledge and scientific evidence of the therapeutic applications of V. polyanthes.