Navegando por Assunto "Testes de toxicidade"

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Acesso aberto (Open Access)
Avaliação seriada do perfil hematológico e bioquímico de primatas não humanos da espécie Sapajus apella tratados com lde-oleato de paclitaxel como instrumento para a terapêutica do câncer
(Universidade Federal do Pará, 2017-02-23) OLIVEIRA, Nayara Cristina Lima de; BURBANO, Rommel Mario Rodriguéz; http://lattes.cnpq.br/4362051219348099
Study of a chemotherapy delivery system, called LDE, with lipid composition similar to the natural low density lipoproteins of the body, denominated by the acronym LDL. LDEs have advantages over commercial chemical forms, since it is able to concentrate in the neoplastic tissues after injection into the circulatory chain, thus being able to target the tumors. LDE can be used as a "carrier" of paclitaxel (PTX) for possible reduction of toxicity and increase of its therapeutic action. The use of non-human primates as in vivo experimental models are of great importance in human health applications due to their anatomical, biochemical and phylogenetic similarities with human primates, generating results that can be interpreted more closely and safely to The phenomena in humans. The aim of the project was to evaluate the chronic toxicity of nanoparticles associated with to chemotherapy Paclitaxel (LDE-PTX) in individuals of the Sapajus apella species, based on the determination of hematological and biochemical parameters and their possible alterations. During the research 15 animals were used, divided into groups: Negative control (CN); Experimental (EXP1 and EXP2) where the animals received LDE-PTX intravenously two different doses of 175 mg / m2 and 250 mg / m2 respectively; and positive control (CP1 and CP2) where the animals intravenously received the drug in commercial form at the same doses used in the experimental group, respectively. Primates were accompanied for 6 cycles of chemotherapy, with interval of 3 weeks. Hematological and biochemical analysis was performed at each cycle through erythrogram and leukogram, alkaline phosphatase, total protein, albumin and globulin, total bilirubin and fractions, glycemia, amylase and serum lipase. E of the sodium and potassium eletrolytes were carried out in the serum of the animals during the collection days. Data were expressed as mean ± standard deviation and submitted to analysis of variance ANOVA, with Bonferroni post-test with significance for p <0.05, through BioEstat®5.3. The obtained results demonstrated advantages of the use of LDE-PTX, since the hematological tests demonstrate that there was a lower toxicity in all the chemotherapeutic cycles and the non-alteration of the majority of the biochemical parameters, demonstrate that the toxicity of the tested drug associated to LDE present smaller Effect toxic than its commercial version. It was concluded from the analysis of the results that hematological and biochemical toxicity was lower in treatment with PTX associated with LDE than treatment of PTX in its commercial form.
Acesso aberto (Open Access)
Caracterização química, avaliação da toxicidade oral aguda e da atividade antinociceptiva do extrato metanólico das folhas de Montrichardia linifera (Arruda) Schott
(Universidade Federal do Pará, 2024-08) COSTA, Wellington Junior Taisho Nagahama; AMARANTE, Cristine Bastos do; http://lattes.cnpq.br/4101983776191966; https://orcid.org/0000-0002-8602-8180; BASTOS, Gilmara de Nazareth Tavares; http://lattes.cnpq.br/2487879058181806
Background: Montrichardia linifera (Arruda) Schott is popularly known as “aninga”, “aningaçu”, “aningaíba” and “aninga-do-igapó”. The compresses and plasters from the leaves of the medicinal plant are used to treat abscesses, tumors and pain caused by stingray stings. Aim of the study: The study aimed to investigate the antinociceptive potential of the methanolic extract of Montrichardia linifera leaves (MEMLL), as well as carry out chemical characterization and acute oral toxicity. Materials and methods: The leaves were collected during the rainy season and the methanolic extract was obtained after gradient extraction in different solvents. The MEMLL was analyzed using high performance liquid chromatography (HPLC) and Nuclear Magnetic Resonance (NMR). The evaluation of the acute oral toxicity test was used to observe the presence of toxic substances. Subsequently, acetic acid, hot plate and formalin tests were used to evaluate the analgesic effects. Results: The HPLC fingerprint analysis allowed the identification of rutin, quercetin and epicatechin. The analysis of NMR spectra identified rutin and quercetin, as well as the flavonoids luteolin and chrysoeriol. The MEMLL did not demonstrate effects considered toxic. In the acetic acid test, the MEMLL inhibited peripheral pain by 51.46% (p < 0.05) at a dose of 50 mg/kg and 75.08% (p < 0.001) at a dose of 100 mg/kg. The hot plate test evaluated the latency time of animals, demonstrating central activity at 30 and 60 min increasing by 164.43% (p < 0.01) and 122.95% (p < 0.05) at a dose of 50 mg /kg and 162.62% (p < 0.01) and 136.68% (p < 0.05) at a dose of 100 mg/kg. The formalin test evaluated the central and peripheral antinociceptive effect of the MEMLL. In the neurogenic phase, a reduction of 35.25% (p < 0.05) at a dose of 50 mg/kg and 52.30% (p < 0.01) at a dose of 100 mg/kg. In inflammatory pain, a reduction of 66.39% (p < 0.0001) and 72.15% (p < 0.0001) was observed. Conclusion: The antinociceptive activity supports its ethnopharmacological use. This analgesic effect is probably associated with the identified flavonoids, all of which have antioxidant, anti-inflammatory and antinociceptive properties. Furthermore, the MEMLL was non-toxic.
Acesso aberto (Open Access)
Estudo preliminar da atividade antiinflamatória de Bryophillum calycinum Salisb
(2005-03) SOUSA, Pergentino José da Cunha; ROCHA, José Carlos da Silva; PESSÔA, Alexandre Mendes; ALVES, Luiz Artur Dias; CARVALHO, José Carlos Tavares
The acute toxicity (LD50) and the anti-inflammatory effect of the crude freeze-dried aqueous extract of the leaves of Bryophillumcalycinum Salisb. (EBALBc) was evaluated, on the rat paw edema induced by carrageenin and dextran. The dose of 500 mg/kg (p.o) inhibited the paw edema induced by dextran in a significative manner (p < 0.05, ANOVA, Student Newman-Keuls test) 60 and 90 minutes, after stimulus while only the oral dose of 1 g/kg of EBALBc inhibited the paw edema induced by carrageenin. The results indicated an anti-edematogenic effect of the extract when tested on the paw edema induced by dextran and carrageenin, suggesting larger specificity of action on the edema induced by dextran. The EBALBc administered orally, in the doses of the 0.1 to 8 g/kg, it did not cause death, making impossible to determine the LD50.