Abstract Doxorubicin (Dox) is a medication used in the treatment of cancerous tumors and hematologic malignancies with potentially serious side effects, including the risk of cardiotoxicity. Flavonoids are plant metabolites with antioxidant properties and can be extracted from Camellia sinensis (CS). The aim of this study is to evaluate the possible cardioprotective effect of CS against injuries induced by Dox in rats. A total of 32 animals were distributed into four groups: (1) control - intraperitoneal injection (I.P.) of 0.5 mL saline weekly and 1.0 mL water by gavage daily; (2) CS - 0.5 mL saline I.P. weekly and 200 mg/kg CS by gavage daily; (3) Dox - 5.0 mg/kg Dox I.P. weekly and 1.0 mL water by gavage daily; and (4) Dox+CS -5.0 mg/kg Dox I.P. weekly and 200 mg/kg CS by gavage daily. Clinical examinations, blood profiles, electrocardiograms, echocardiograms, and histological analyses of hearts were performed over 25 days. The animals in the Dox group showed changes in body weight and in erythrogram, leukogram, electrocardiography, and echocardiography readings. However, animals from the dox+CS group had significantly less change in body weight, improved cardiac function, and showed more preserved cardiac tissue. This study demonstrated that CS prevents dox-induced cardiotoxicity, despite enhancing the cytotoxic effect on blood cells.

Nerium oleander é uma planta ornamental responsável por intoxicações em animais e humanos. Todas as partes da planta contém glicosídeos cardiotóxicos, principalmente a oleandrina. Alguns autores apontam que a toxicidade da planta apresentaria variação em função da cor da flor. O objetivo deste trabalho foi determinar se existe variação na concentração de oleandrina nas folhas de N. oleander de exemplares da planta com diferentes cores de inflorescências. Foram coletadas 10 amostras de folhas para cada tipo de flor (branca, rosea e vermelha). Os níveis de oleandrina foram determinados por meio de HPLC-UV após extração com metanol, precipitação com acetato de chumbo e separação em cartucho de C18. A média da concentração obtida em todas as folhas analisadas foi de 4,89mg g-1, sendo 6,20±4,08mg g-1 na variedade de flores brancas, 4,16±3,44mg g-1 na de flores roseas e 4,31±1,99mg g-1 na de flores vermelhas. As concentrações de oleandrina não apresentaram diferença estatisticamente significante entre as variedades de flores

Nerium oleander is an ornamental plant responsible for poisoning in animals and humans. All parts of the plant contain cardiotoxic glycosides, mainly oleandrin. Some authors suggest that the toxicity of the plant would present a dependence on flower color. The objective of this study was to determine whether there is variation in the concentration of oleandrin in the leaves of N. oleander specimens of different colors of flowers. Ten samples of leaves from each variety of flower (white, pink and red) were collected. Oleandrin levels were determined by HPLC-UV after extraction with methanol, precipitation with lead acetate and separation with C18 cartridge. The average concentration obtained in all analyzed leaves was 4.89mg g-1, being 6.20±4.08mg g-1 in variety of white flowers, 4.16±3.44mg g-1 in pink flowers, and 4.31±1.99mg g-1 in red flowers. The concentrations of oleandrin did not show statistically significant difference between the varieties of flowers

O conhecimento sobre a fisiologia e regulação dos eletrólitos e do equilíbrio ácido-base é necessário, pois a saúde do animal depende diretamente da composição normal dos fluídos nos diversos compartimentos corporais. Esta regulação está intimamente entrelaçada em um rigoroso e preciso controle, de modo que uma anormalidade em um destes compartimentos reflete na alteração dos demais. A avaliação do equilíbrio eletrolítico e ácido-base pode fornecer informações fundamentais para o diagnóstico, prognóstico e decisão terapêutica de diversas enfermidades nos bovinos, tais como diarreias neonatais, hemoparasitoses (anaplasmose e a babesiose), deslocamento de abomaso e processos de sépticos. As correções destas alterações com medidas terapêuticas adequadas são pontos chave para minimizar as perdas por mortalidade causadas por estas enfermidades.

The knowledge of the physiology and regulation of electrolytes and blood gas parameters is necessary because the health of the animal depends directly on the normal composition of fluid in body compartments. The regulation of these is closely intertwined with a rigorous and precise control so that an abnormality in one of these compartments reflects the change in the other. The evaluation of electrolyte and acid-base balance can provide key information for diagnosis, prognosis and therapeutic decision for several diseases in animals such as neonatal diarrhea, anaplasmosis and babesiosis, displacement of abomasum and septic processes. The corrections of these changes with appropriate treatment are key to minimizing losses due to mortality in these diseases.