Navegando por Autor "FEIO, Danielle Cristinne Azevedo"

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Acesso aberto (Open Access)
Avaliação do perfil da resposta celular observado em indivíduos da espécie Cebus apella expostos ao carcinógeno N-Metil-N-nitrosuréia (mnu) e tratados com o modificador da resposta imune canova®
(Universidade Federal do Pará, 2011-04-19) FEIO, Danielle Cristinne Azevedo; BRITO JÚNIOR, Lacy Cardoso de; http://lattes.cnpq.br/9705670940390281; LIMA, Patrícia Danielle Lima de; http://lattes.cnpq.br/3411620003450812
The Immune response modifier Canova® (CA) is a homeopathic drug indicated for patients with a depressed immune system, once this medicine appears to increase the innate immunity and induce an immune response against multiple and severe pathological conditions, including Neoplasms. This increase of innate immunity is due to its involvement in the proliferation and differentiation of hematopoietic cells and mononuclear differentiation induction in bone marrow cells. The chemical compound N-Methyl-N-Nitrosourea (MNU) is a alkylating agent powerful carcinogenic able to cause mutations, chromosomal aberrations and DNA methylation, that induce the imbalance in the defense system of the cell and thus stop mechanisms related to cellular metabolism. This compound has been widely used in the induction of experimental tumors. The goal of this work is to assess the pattern of hematopoietic cell response in Cebus apella primate species exposed to carcinogenic N-Methyl-N-Nitrosourea (MNU) and subjected to the treatment with the Immune response modifier Canova®, through the analysis of biochemical, haematological, immune and cell cycle. We had used 13 (thirteen) adult animals of the species Cebus apella divided into five main groups: the control (negative and positive) and experimental (composed of three subgroups). The first experimental group received the MNU during thirty-five days, the second received treatment with Canova during three days, and the third received the MNU during 35 days and the end of this period received treatment with Canova during three days. Evaluation of cellular immune response was through immunophenotyping (CD3, CD4, CD8, T, B, NK) and complete blood count, liver and kidney function through biochemical analysis (ALT, AST, GGT, urea and creatinine) and kinetic evaluation of cell cycle by flow cytometry. Analysis of haematological values of hemoglobin, hematocrit and red blood cells of positive control groups performed significantly lower when compared to the negative control groups, demonstrating an anemia, while the increased white lineage cells in these groups is probably due to the animal's inflammatory response to neoplastic process. The increase of leukocytes has also been observed in experimental groups treated with the CA, a fact explained by the action of this drug, which acts as a modifier of immune response. Although it has been reported that CA can act by increasing the number of neutrophils, in this study we did not observe this action of the medicinal product, probably by the short time of treatment. Monocytes were decreased in the group treated with MNU and risen in groups that received CA probably by drug act in the activation of macrophages via stimulation of monocytes. In biochemical analysis, urea and creatinine were changed in the groups that received the MNU acutely, these changes, as well as those found in the analysis of liver enzymes, can be associated with typical symptoms of poisoning by carcinogenic drugs. Analysis of cell cycle kinetics of animals treated with CA, there had been a significant increase in cell G0-G1 as well as the percentage of cells in cellular proliferation stage (stageG2-M). We found that CA had minimized the toxicity of the MNU in certain haematological and biochemical, we had observed their partially skill to modify immune response, as improve white blood cell count, but without changing the pattern of immunological markers. Then CA is able to restore some hematopoietic system components and can act as an adjuvant in chemotherapy treatments.
Acesso aberto (Open Access)
Avaliação do uso de nanopartículas lipídicas que se ligam a receptores celulares como instrumento para a terapêutica do câncer
(Universidade Federal do Pará, 2014-12-19) FEIO, Danielle Cristinne Azevedo; LIMA, Patrícia Danielle Lima de; http://lattes.cnpq.br/3411620003450812
Lipid-based nanoparticle systems have been used as vehicles for chemotherapeutic agents in experimental cancer treatments. More recently, those preparations have also been assayed in animal models of cardiovascular, rheumatic and other chronic inflammatory diseases. In general those systems reportedly attenuate the severe toxicities of chemotherapeutic agents. This study was aimed to investigate the effects of associating paclitaxel to a lipid-based nanoparticle system upon the organism of a non-human primate, Cebus apella, by extensively documenting the toxicity by serum biochemistry, hematological and detailed histopathological methods. The lipid nanoparticles (LDE) were constituted of cholesterol esters and esterified cholesterol, lecithin and triolin, with addition of paclitaxel. Eighteen Cebus apella were studied; three animals were treated with LDE only, without paclitaxel, as ministered intravenously every three weeks, during six treatment cycles; six animals were treated with paclitaxel associated to LDE at the same administration scheme, three with the lower (175mg/m2) and three with higher (250mg/m2) paclitaxel doses; six animals were treated with commercial paclitaxel, three with the lower and three with the higher doses levels. Three weeks after the treatment cycle the animals were euthanized by lethal anesthetic dose, and tissues fragments were collected for histopathological analysis. In three non-treated animals, the plasma kinetics of LDE’s labeled with radioactive cholesterol was determined after intravenous injection and blood sampling over 24 hours. The ethics committee in research with experimental animals UFPA (BIO008-11) approved the project. In the LDE-paclitaxel group, no clinical toxicity appeared, and the weight food consumption curve were similar to controls. Treatment was interrupted after the second cycle in four animals of commercial paclitaxel group for very high clinical toxicity but the remaining two complete the 6-cycle-treatment. Those two animals presented weight loss, nausea and vomiting, diarrhea, escame decamation, 70% fur loss and loss of physical activity. The 175mg/m2 paclitaxel dose is used in cancer chemoterapie with considerable toxicity, while the 250 mg/m2 dose shows intorable toxicity to the patients. The use of LDE as carrier in both those levels was almost complete neutralized the toxicity of the drug in this species more closed related to human subjects. This was observed not only by clinical, biochemical and hematological profiles but also by the histopathological analysis of stomach, small and large intestine, esophagus, pancreas, trachea and gallbladder. The current results support the assumption that lipid-based nanoparticles systems used was drug carriers can offer valuable tools decrease the toxicity and increase the safety of the chemotherapeutic agents, while extending the use to chronic diseases other than cancer.
Acesso aberto (Open Access)
Diagnóstico de imunofenótipos de síndromes linfoproliferativas crônicas por citometria de fluxo na Fundação HEMOPA
(2011-12) BRITO JUNIOR, Lacy Cardoso de; FEIO, Danielle Cristinne Azevedo; BARBOSA, Suane Reis; BENTES, Alessandra Quinto; FRANCÊS, Larissa Tatiane Martins
INTRODUCTION: Lymphoproliferative syndromes comprise a heterogeneous group of malignant neoplasias with different clinical behaviors, pathological factors and epidemiological characteristics, whose diagnosis may be based on lymphoid cell morphology observed in peripheral blood. OBJECTIVE: To test the diagnostic feasibility of immunophenotyping by flow cytometry for lymphoproliferative syndromes through the definition of minimal antibody panel. MATERIAL AND METHODS: During the period of July 2008 to July 2010, 47 patients from HEMOPA blood center participated in this study for differential diagnosis of lymphoproliferative syndromes subtypes by flow cytometry. RESULTS: The mean age was 68 years old. There was no statistical difference between genders, and the most frequent subtype of lymphoproliferative syndromes was chronic lymphoid leukemia/small B-cell lymphocytic lymphoma. CONCLUSION: Based on the antibody panel recommended in this investigation, the immunophenotyping method by flow cytometry associated with morphological characterization of peripheral blood samples is a reliable, rapid, feasible, and non-invasive procedure for the diagnosis of chronic lymphoproliferative syndromes.