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1.
Clin Toxicol (Phila) ; 48(3): 234-7, 2010 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-20170391

RESUMO

INTRODUCTION: White or false hellebore (Veratrum album) has a toxicological relevance because of the potential for misidentification of this plant as yellow gentian (Gentiana lutea). CASE SERIES: We report a retrospective case series of 11 children (8-12 years) with accidental intake of V. album at a youth camp where they had collected herbs for preparing fresh herb tea. Two children (18%) remained asymptomatic. Nine (82%) developed mild gastrointestinal symptoms, six (55%) presented neurological symptoms, and three (27%) showed bradycardia. All children recovered completely within 10 h of ingestion. The plant was identified at the emergency department; however, detection of veratridine and cevadine by means of high-performance liquid chromatography-Mass spectrometry from the blood of the child with the most severe symptoms was negative (limit 0.01 ng/mL). DISCUSSION: Veratrum species contain more than 200 different alkaloids, which are the principal toxins and are responsible for most clinical symptoms. There are likely multiple mechanisms of toxicity and some of them are only partially understood. The opening of voltage-gated sodium channels is probably one of the most relevant pathophysiological mechanisms. CONCLUSIONS: Veratrum album intoxication in children demonstrated the same clinical course as observed in adults. Accidental ingestion of a low dose of the plant had a favorable outcome with supportive care.


Assuntos
Intoxicação por Plantas/etiologia , Alcaloides de Veratrum/envenenamento , Veratrum/envenenamento , Bradicardia/etiologia , Criança , Gastroenteropatias/etiologia , Humanos , Doenças do Sistema Nervoso/etiologia , Estudos Retrospectivos , Canais de Sódio/efeitos dos fármacos , Canais de Sódio/metabolismo , Chá/química , Veratrum/química
2.
Brain Res Bull ; 68(1-2): 42-53, 2005 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-16325003

RESUMO

Neurturin (NRTN), artemin (ARTN), persephin (PSPN) and glial cell line-derived neurotrophic factor (GDNF) form a group of neurotrophic factors, also known as the GDNF family ligands (GFLs). They signal through a receptor complex composed of a high-affinity ligand binding subunit, postulated ligand specific, and a common membrane-bound tyrosine kinase RET. Recently, also NCAM has been identified as an alternative signaling receptor. GFLs have been reported to promote survival of cultured dopaminergic neurons. In addition, GDNF treatments have been shown to increase morphological differentiation of tyrosine hydroxylase immunoreactive (TH-ir) neurons. The present comparative study investigated the dose-dependent effects of GFLs on survival and morphological differentiation of TH-ir neurons in primary cultures of E14 rat ventral mesencephalon. Both NRTN and ARTN chronically administered for 5 days significantly increased survival and morphological differentiation of TH-ir cells at all doses investigated [0.1-100 ng/ml], whereas PSPN was found to be slightly less potent with effects on TH-ir cell numbers and morphology at 1.6-100 ng/ml and 6.3-100 ng/ml, respectively. In conclusion, our findings identify NRTN, ARTN and PSPN as potent neurotrophic factors that may play an important role in the structural development and plasticity of ventral mesencephalic dopaminergic neurons.


Assuntos
Mesencéfalo/citologia , Proteínas do Tecido Nervoso/metabolismo , Neurônios/efeitos dos fármacos , Neurturina/metabolismo , Animais , Contagem de Células , Diferenciação Celular/efeitos dos fármacos , Diferenciação Celular/fisiologia , Forma Celular/efeitos dos fármacos , Células Cultivadas , Dopamina/fisiologia , Feminino , Fatores Neurotróficos Derivados de Linhagem de Célula Glial/metabolismo , Fatores Neurotróficos Derivados de Linhagem de Célula Glial/farmacologia , Proteínas do Tecido Nervoso/farmacologia , Neuritos/efeitos dos fármacos , Neurônios/ultraestrutura , Neurturina/farmacologia , Gravidez , Ratos , Tirosina 3-Mono-Oxigenase/metabolismo
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