RESUMO
Five adult Saanen goats received a single oral dose of Heterophyllaea pustulata containing 42.25 µg/kg rubiadin (anthraquinone) and 3 adult goats were untreated controls. All goats were exposed to sunlight and sequential ear skin biopsies were collected before treatment and at 32 hours, 3 days, 8 days, and 15 days after treatment. Changes at 32 hours after dosing included epidermal spongiosis, single cell death and acantholysis, an increased BAX/BCL-2 protein ratio, and dermal edema. Lesions at day 3 included epidermal and adnexal necrosis, crust formation, and acanthosis. Acanthosis, hyperkeratosis, and dermal fibrosis and neovascularization were present at day 15. The pro-apoptotic (BAX)/anti-apoptotic (BCL-2) protein ratio increased at 32 hours, whereas epidermal and dermal PCNA immunolabeling increased between days 8 and 15 after treatment. The cutaneous lesions were consistent with sunlight-induced damage, and the occurrence in treated but not control goats indicates photosensitization.
Assuntos
Doenças das Cabras , Transtornos de Fotossensibilidade , Animais , Doenças das Cabras/induzido quimicamente , Cabras , Transtornos de Fotossensibilidade/induzido quimicamente , Transtornos de Fotossensibilidade/veterinária , PeleRESUMO
Resumen Las intoxicaciones o las sobredosis de drogas constituyen una fuente importante de morbilidad, mortalidad y gasto en salud en todo el mundo. Especialmente en adultos menores de 35 años, las intoxicaciones vienen a ser la principal causa de paro cardíaco no traumático, siendofármacos más comunes involucrados, analgésicos, antidepresivos, opioides, sin embargo, esto puede variar. Es importante realizar un abordaje rápido, con base en interrogatorio, información de cualquier testigo y evidencia, además la clínica del paciente. El paro cardíaco debido a toxicidad se maneja de acuerdo conlos estándares actuales de reanimación cardiopulmonar básica y avanzada, siguiendo los principios del A, B, C, D, E. Las manifestaciones clínicas y abordaje clínico pueden variar bastante dependiendo de la sustancia involucrada. Las pruebas de laboratorio casi nunca están disponibles en un marco de tiempo que respalde las decisiones de reanimación tempranas, aún así, es recomendable realizarlas. En general los efectos tóxicos pueden reducirse si se limita la absorción del o los fármacos o se aumenta su eliminación. Además, se puede bloquear efectos farmacológicos no deseados con los llamados antídotos. El uso del carbón activado, algunos antídotos específicos, y tratamientos extracorpóreos también se contemplan en la presente revisión.
Abstract Poisoning or drug overdose is a major source of morbidity, mortality and health expenditure worldwide, especially in adults under 35, where it is the leading cause of non-traumatic cardiac arrest, being more common drugs involved, analgesics, antidepressants, opioids, however, this may vary. It is important to make a quick approach, based on questioning, information from any witness and evidence, and the patient's clinic. Cardiac arrest due to toxicity is managed according to current Basic and Advanced life support standards, following the principles of A, B, C, D, E. Clinical manifestations and clinical approach can vary considerably depending on the substance involved. Laboratory tests are almost never available in a time frame that supports early resuscitation decisions, yet it is advisable to perform them. In general, the toxic effects can be reduced if the absorption of the drugs is limited or their elimination increased. In addition, you can block unwanted pharmacological effects with so-called antidotes. The use of activated charcoal, specific antidotes, and extracorporeal treatments are also covered in this review.
Assuntos
Intoxicação , Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos , Parada Cardíaca/induzido quimicamenteRESUMO
BACKGROUND: Metaldehyde is a toxic pesticide used mainly as a molluscicide, responsible for intoxication and deaths in both humans and animals. Accidental exposure to metaldehyde in dogs is considered rare, but severe. Data concerning clinical and veterinary forensic toxicology are largely incomplete, especially regarding case reports in dogs. The present work reports a complete and detailed description of a case from the history, clinical evolution, pathological exams and toxicological diagnosis in an accidental case of metaldehyde poisoning in dog. CASE PRESENTATION: An eleven-month-old, 3.0 kg, male German Spitz was presented for emergency care with acute vomiting and seizures 3 hours after suspected accidental ingestion of commercial molluscicide containing 3% metaldehyde (Lesmax®). The animal was in lateral recumbency and showed stuporous mentation, salivation, tonic-clonic status epilepticus, systemic tremors, bilateral miosis, absent palpebral, corneal, oculovestibular and gag reflexes, severely depressed spinal reflexes, dyspnea and tachycardia. Despite treatment, the patient progressed to comatose mentation and died. Necropsy examination revealed discrete lesions in the liver and central nervous system, while stomach examination revealed content of feed, activated charcoal and blue-green granules, compatible to the commercial formula of metaldehyde. Histology examination revealed extensive hemorrhage and severe centrolobular necrosis of the liver and tumefaction of Kupfer cells. Brain samples showed discrete hemorrhage and hyperemia. In order to confirm the diagnosis, samples from feces, stomach content, spleen, liver, heart, kidneys and brain were submitted gas chromatography analysis. Results confirmed the presence of metaldehyde in all samples. We describe clinicopathological abnormalities of a fatal case of metaldehyde poisoning in a dog, as well as postmortem diagnosis using gas chromatography. CONCLUSION: Metaldehyde poisoning is rarely reported, since the diagnosis is often difficult and the notifications scarce. To our knowledge, this is the first report describing clinical signs, pathological findings and chromatographic diagnosis. This report aims to contribute to the understanding of the pathogenesis of metaldehyde intoxication, to further explore veterinary forensic toxicology diagnosis.
Assuntos
Acetaldeído/análogos & derivados , Doenças do Cão/induzido quimicamente , Moluscocidas/intoxicação , Acetaldeído/análise , Acetaldeído/intoxicação , Animais , Cromatografia Gasosa/métodos , Cromatografia Gasosa/veterinária , Doenças do Cão/patologia , Cães , Evolução Fatal , Toxicologia Forense , Masculino , Moluscocidas/análiseRESUMO
A wide range of career options is available globally in the environmental toxicologic pathology (ETP) arena including academia, government, contract research organizations, and the agrichemical/chemical industry. This small and specialized subset of toxicologic pathologists addresses the effects of contaminants and pollutants on human, animal, and ecological health (One Health). Veterinary students and pathology trainees are primarily exposed to diagnostic pathology and often have limited exposure to toxicologic pathology and even less so to the issues and opportunities in environmental toxicology. The speakers provided a brief overview of global opportunities in their work sector and personal perspectives of their careers in ETP. The following panel discussion provided an opportunity to discuss issues related to careers in this specialty.
Assuntos
Escolha da Profissão , Ecotoxicologia , Patologia , Sociedades Científicas , Congressos como Assunto , Ecotoxicologia/educação , Ecotoxicologia/tendências , Patologia/educação , Patologia/tendências , Faculdades de Medicina , Estados Unidos , United States Government Agencies , UniversidadesRESUMO
Schistosomus reflexus syndrome (SR) is a rare and lethal congenital malformation that has been reported in the olive ridley sea turtle (Lepidochelys olivacea) in Mexico. Although the etiology remains unclear, it is presumed to be genetic. Since embryonic development in sea turtles largely depends on environmental conditions, we investigated whether sea turtle total mercury content participates in the etiology of SR. Given that several toxins are known to affect both DNA methylation and/or mitochondrial DNA (mtDNA) copy number, we also probed for associations of these parameters to SR and mercury exposure. We measured the levels of each variable in malformed olive ridley sea turtle embryos (either with SR or other non-SR malformations) and embryos without malformations. Malformed embryos (with or without SR) showed higher mercury concentrations compared to normal embryos, while only embryos with SR showed higher levels of methylation compared to embryos without malformations and those with other malformations. Furthermore, we uncovered a positive correlation between mercury concentrations and DNA methylation in SR embryos. With respect to mtDNA copy number, no differences were detected across experimental groups. Because of sample size limitations, this study is an initial attempt to understand the association of environmental toxins (such as mercury) and epigenetic alterations (DNA methylation) in the etiology of SR in sea turtles.
Assuntos
Anormalidades Múltiplas/veterinária , Mercúrio/análise , Tartarugas/anormalidades , Animais , Variações do Número de Cópias de DNA , Dano ao DNA/efeitos dos fármacos , Metilação de DNA , DNA Mitocondrial/genética , Espécies em Perigo de Extinção , Exposição Ambiental , Feminino , Mercúrio/toxicidade , Síndrome , Tartarugas/embriologia , Tartarugas/genéticaRESUMO
It is known that either arsenic exposure or diabetes can impact renal function. However, it is unclear how these combined factors may influence kidney functions. Therefore, we evaluated morphological, functional, and oxidative parameters in the kidney of diabetic rats exposed to arsenic. Healthy male Wistar rats and streptozotocin-induced diabetic rats were exposed to 0 and 10 mg/L arsenate through drinking water for 40 days. Renal tissue was assessed using morphometry, mitosis and apoptosis markers, mineral proportion, oxidative stress markers, as well as the activity of antioxidant enzymes and membrane-bound adenosine triphosphatases. Arsenate intake altered glucose levels in healthy animals, but it did not reach hyperglycemic conditions. In diabetic animals, arsenate led to a remarkable increase of glycogen nephrosis in distal tubules. In these animals, additionally, the activity of catalase and glutathione S-transferase, besides the proportion of Fe, Cu, and K in renal tissue, was altered. Nevertheless, arsenate did not accumulate in the kidney and did not impact on other parameters previously altered by diabetes, including levels of malondialdehyde, Na, urea, creatinine, and apoptosis and mitosis markers. In conclusion, besides the intensification of glycogen nephrosis, the kidney was able to handle arsenate toxicity at this point, preventing arsenic deposition in the exposed groups and the impairment of renal function.
Assuntos
Arsênio/toxicidade , Glicogênio/metabolismo , Substâncias Perigosas/toxicidade , Animais , Antioxidantes/metabolismo , Apoptose/efeitos dos fármacos , Arseniatos , Biomarcadores/metabolismo , Catalase/metabolismo , Creatinina/metabolismo , Diabetes Mellitus Experimental , Rim/metabolismo , Masculino , Malondialdeído/metabolismo , Nefrose , Estresse Oxidativo/efeitos dos fármacos , Ratos , Ratos WistarRESUMO
Introducción: La enfermedad cerebrovascular constituye un importante problema de salud a nivel mundial. En la actualidad se desarrollan investigaciones científicas dedicadas al estudio de los efectos del campo magnético de frecuencia extremadamente baja para su tratamiento. No es suficientemente clara la información acerca de su inocuidad en las dosis estudiadas. Objetivo: Estudiar la seguridad de la aplicación del campo magnético de frecuencia extremadamente baja a nivel del sistema nervioso central a través de un estudio toxicológico a dosis aguda, repetida y ensayo de micronúcleos en médula ósea. Métodos: Se conformaron tres grupos experimentales con ratas Sprague Dawley Cenp:SPRD jóvenes y sanas para los experimentos de toxicidad y ratones CENP: NMRI para la evaluación mutagénica. Se utilizaron controles negativos no tratados. En el ensayo de micronúcleos se incorporó un grupo control positivo al que se administró Ciclofosfamida por vía intraperitoneal. Se aplicó un campo magnético no homogéneo con niveles de inducción magnética de 6,5 y 15 mT, tomando como referencia el valor máximo sobre la superficie de la bobina. Para la aplicación del campo magnético la bobina estimuladora se colocó sobre la cabeza asegurando la exposición completa del encéfalo. Resultados: En ninguno de los ensayos se detectaron signos de toxicidad. Se comprobó así mismo que no se indujeron efectos genotóxicos ni citotóxicos sobre las células somáticas. Conclusiones: El tratamiento con campo magnético de frecuencia extremadamente baja a nivel del sistema nervioso central en las condiciones experimentales y dosis estudiadas es seguro(AU)
Introduction: Stroke is a major health problem all over the world. Nowadays are developed scientific researches devoted to the study of extremely low frequency magnetic field effects over this illness. The information about it safety is unclear yet. Objective: To study the safety of extremely low frequency magnetic field applied at central nervous system level wasby means ofa toxicological assay (Acute, repeated doses and micronucleus in bone marrow assay) Methods: Three experimental groups were made with Sprague Dawley Cenp: SPRD young and healthy rats for toxicity experiments and CENP: NMRI mice for mutagen evaluation. Untreated negative controls were used. In the micronucleus assay, an additional positive control group was included. This group received Cyclophosphamide by intraperitoneal administration. Was applied a non-homogenousmagnetic fieldof 6,5 and 15 mT, taken as reference the maximum value over the coil surface. The coil was positioned over the head, ensuring full exposure of brain to magnetic field. Results : In none of trials were detected any sign of toxicity. It was also found no genotoxic or cytotoxic effects induced on somatic cells. Conclusions : These results indicated the safety of treatmentwith extremely low frequency magnetic field at central nervous system level for experimental conditions and doses studied(AU)
Assuntos
Animais , Transtornos Cerebrovasculares/terapia , Magnetoterapia/métodos , Sintomas Toxicológicos/toxicidade , Ratos Sprague-Dawley , Neuroproteção , Testes de Mutagenicidade/métodosRESUMO
Exposure to pesticides may increase the generation of reactive oxygen species (ROS), leading to oxidation of cell membrane lipids and proteins. Although fruit bats are potentially exposed to pesticides during their entire lifespan, the impacts of this exposure are still poorly investigated. We examined the effects of low, commercially recommended concentrations (0, 1.05 and 2.1 g/l) of an organochlorine insecticide endosulfan (EDS) formulation on oxidative responses in the liver and kidneys of Neotropical fruit bats (Artibeus lituratus), as well as possible liver morphological alterations following a 35-day oral exposure. Superoxide dismutase activity was significantly decreased upon exposure to 1.05 g/l of EDS in the liver and kidneys, catalase was decreased in the liver of 2.1 g/l EDS-exposed bats, while glutathione S-transferase was increased in the liver of 2.1 g/l EDS-exposed bats. Protein carbonyls increased following the exposure to the highest EDS dose tested. Endosulfan-induced morphological alterations in the liver included cell degeneration and cell death, with apparent cytoplasm lipid accumulation (steatosis) and pyknotic nuclei, karyolysis and deposit of collagen fibres. Our findings suggest that exposure to low concentrations of EDS induced a certain extent of oxidative damage in fruit bats, which may have led to liver morphological alterations.
Assuntos
Quirópteros/fisiologia , Endossulfano/efeitos adversos , Inseticidas/efeitos adversos , Fígado/efeitos dos fármacos , Estresse Oxidativo/efeitos dos fármacos , Animais , Catalase/metabolismo , Glutationa Transferase/metabolismo , Rim/efeitos dos fármacos , Rim/metabolismo , Peroxidação de Lipídeos/efeitos dos fármacos , Fígado/citologia , Masculino , Espécies Reativas de Oxigênio/metabolismo , Superóxido Dismutase/metabolismoRESUMO
A espécie Pilocarpus microphyllus Stapf. recebe a designação geral de jaborandi, fonte industrial de pilocarpina, utilizada no tratamento do glaucoma. O jaborandi contém vários alcalóides secundários. A epiisopilosina foi submetida a testes farmacológicos para determinação da DL50 screening hipocrático e determinação do peso corporal dos animais sobreviventes da DL50. A análise dos resultados revelou que a epiisopilosina apresentou DL50 duas vezes maior que a pilocarpina. Os animais que sobreviveram à determinação da DL50 ganharam peso no período de 14 dias de observação. A eplisopilosina demonstrou ser um estimulante periférico do sistema nervoso parassimpático, semelhante à pilocarpina, somente em altas doses.
Pilocarpus microphyllus Stapf. (Rutaceae) is a source for industrial isolation of pilocarpine, alkaloid used in the treatment of glaucoma. It contains several secondary alkaloids; one of them being eplisopilosine. Pharmacological evaluation showed DL50 value of epiisopilosine two times higher than of pilocarpine. Epiisopilosine also showed to be a pilocarpine-like peripheric stimulant of parasympatic nervous system, although in higher dosis.