NDLI: Renal toxicity caused by oral use of medicinal plants: the yacon example.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	de Oliveira, Rejane Barbosa de Paula, Daniela Aparecida Chagas Rocha, Bruno Alves Franco, João José Gobbo-Neto, Leonardo Uyemura, Sérgio Akira Dos Santos, Wagner Ferreira Da Costa, Fernando Batista
Spatial Coverage	Brazil
Description	Country affiliation: Brazil Author Affiliation: de Oliveira RB ( Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café s/n, 14040-903 Ribeirão Preto, SP, Brazil.)
Abstract	AIM OF THE STUDY: Yacon [Smallanthus sonchifolius (Poepp. & Endl.) H. Robinson, Asteraceae] is an Andean species that has traditionally been used as an anti-diabetic herb in several countries around the world, including Brazil. Its hypoglycaemic action has recently been demonstrated in normal and diabetic rats. However, studies about the safety of prolonged oral consumption of yacon leaf extracts are lacking. Thus, this work was undertaken to evaluate the repeated-dose toxicity of three extracts from yacon leaves: the aqueous extract (AE) prepared as a tea infusion; the leaf-rinse extract (LRE), which is rich in sesquiterpene lactones (STLs); and a polar extract from leaves without trichomes, or polar extract (PE), which lacks STLs but is rich in chlorogenic acids (CGAs). MATERIALS AND METHODS: The major classes of the compounds were confirmed in each extract by IR spectra and HPLC-UV-DAD profiling as well as comparison to standard compounds. The toxicity of each extract was evaluated in a repeated-dose toxicity study in Wistar rats for 90 days. RESULTS: The PE was rich in CGAs, but we did not detect any STLs. The AE and LRE showed the presence of STLs. The polar extract caused alterations in some biochemical parameters, but the animals did not show signs of behavioural toxicity or serious lesions in organs. Alterations of specific biochemical parameters in the blood (creatinine 7.0 mg/dL, glucose 212.0 mg/dL, albumin 2.8 g/dL) of rats treated with AE (10, 50 and 100 mg/kg) and LRE (10 and 100 mg/kg) pointed to renal damage, which was confirmed by histological analysis of the kidneys. CONCLUSIONS: The renal damage was associated with increased blood glucose levels after prolonged oral administration of the AE. This observation suggested that the hypoglycaemic effect observed after treatment for 30 days in an earlier study is reversible and was likely the result of renal injury caused by the toxicity of yacon. Because STLs were detected in both AE and LRE, there is strong evidence that these terpenoids are the main toxic compounds in the leaves of the yacon. Based on our results, we do not recommend the oral use of yacon leaves to treat diabetes.
File Format	HTM / HTML
ISSN	03788741
Issue Number	2
Volume Number	133
e-ISSN	18727573
Journal	Journal of Ethnopharmacology
Language	English
Publisher	Elsevier
Publisher Date	2011-01-27
Publisher Place	Ireland
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Ethnopharmacology Asteraceae Toxicity Kidney Drug Effects Administration, Oral Animals Chemistry Blood Glucose Metabolism Brazil Chlorogenic Acid Administration & Dosage Ethnopharmacology Female Hypoglycemic Agents Pathology Physiopathology Lactones Male Medicine, Traditional Phytotherapy Plant Extracts Plant Leaves Plants, Medicinal Rats Rats, Wistar Sesquiterpenes Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Drug Discovery Pharmacology

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