Investigação do potencial tóxico do extrato etanólico de krameria tomentosa a. St. Hill sobre o sistema reprodutor de ratos e ratas e suas proles

• Ano de defesa: 2016
• Autor(a) principal: Santos, Elane Cristina Silva dos
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Farmacologia; Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos; UFPB
• Palavras-chave em Português: Krameria tomentosa; Fertilidade; Ratos; Toxicidade reprodutiva; Prole; Fertilidade ratos; CIENCIAS BIOLOGICAS::FARMACOLOGIA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/9509

Krameria tomentosa (“carrapicho de cavalo” or “ratainha-da-terra”) is a shrub used in folk medicine for its astringent action. Considering its popular use and the lack of information about its toxicity, this study aimed to establish the acute oral toxicity of the ethanolic extract of the roots of K. tomentosa (EEKt) and its hexane fraction (FHEEKt) in Wistar rats, and to study the toxic potential on the male and female reproductive system and vital organs and their offspring. For the investigation of the acute oral toxicity, 30 females rats were divided into control (distilled water and Tween 80 2%) and treated groups that received the extract and hexane fraction at dose levels of 300 or 2000 mg/kg (n=3). Each dose was tested twice for subsequent estimation of LD50 (OECD-423/2001). The following parameters were analyzed: body weight, water and food intake, Hippocratic screening and behavior. For assessment of reproductive toxicity, female and male Wistar rats were divided into four groups of 12 animals each: three groups treated orally and once daily with EEKt at doses of 125, 500 or 2000 mg/kg, and one control group. For evaluation of the toxic potential of EEKt on the male reproductive system, rats were treated for 52 days (period corresponding to one spermatogenic cycle). On the female reproductive system, female rats were treated from the 1st to the 7th day of pregnancy (pre-implantation), and from the 8th day of pregnancy (post-implantation) until the end of lactation. The animals were evaluated for the occurrence of general signs of toxicity, consumption of water and food, biochemical, hormonal and hematologic analyses, body weight, weight of vital and reproductive organs, and reproductive indexes. In males, sperm production and morphology were also analyzed. The offspring were evaluated for overall development, reflexology and behavioral development. The results obtained in the evaluation of acute oral toxicity showed low toxicity of EEKt and FHEEKt as evidenced by the absence of mortality or morbidity in the experimental groups. In the reproductive toxicity studies, the body weight of males was reduced by EEKt at doses of 125, 500 and 2000 mg/kg. In the females, exposure to EEKt during preimplantation reduced water and food consumption and increased the pre-implantation loss index at the dose of 2000 mg/kg. During post-implantation and lactation, maternal deaths, increased post-implantation loss index and decreased weaning index at doses of 500 and 2000 mg/kg extract were observed. The offspring exhibited late development of adult reflexes and negative geotaxis. The results indicate a low toxicity profile after the single dose treatment with EEKt or FHEEKt but suggest possible systemic toxic effects, and reproductive toxicity in male and female Wistar rats after exposure to EEKt during critical stages of the reproductive process.